Newport HT50, HT50-H, HT50-H1, HT50-H1-B Service Manual

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Page 1

Newport Medical Instruments, Inc.

NEWPORT HT50 VENTILATOR

Service Manual

SERHT50NA Rev. A

September 2008

(P/N HT50-H, HT50-H1, HT50-H1-B)

Exclusively distributed by: NEWPORT MEDICAL INSTRUMENTS, INC. 1620 Sunflower Avenue Costa Mesa, CA 92626 USA Tel: 1.714.427.5811 Ext. 500 Tel: 1.800.451.3111 (USA only) Fax: 1.714.427.0572 Customer Service ext. 282

www.Ventilators.com email: Info@Ventilators.com

Page 2

MANUAL REVISION HISTORY

HT50 Service Manual SERHT50NA DATE REVISION PAGES EFFECTED

August 2008 A New release for dual

nal battery update

inter

SERHT50NA A0808

Page 3

TABLE OF CONTENTS

Section 1 . . . . . . . . . . OPERATOR’S RESPONSIBILITY

• Operator’s Responsibility for Patient Safety

• Limitation of Liability

• Warranty

• Definitions

• Typing Conventions

• Warnings and Cautions

• Factory Maintenance or Repair

• Contact Information

Section 2 . . . . . . . . . . SPECIFICATIONS

Intended Use

•

• Symbols / Labeling Table

• Controls / Alarms / Monitors

• Hardware Requirements

• Miscellaneous Specifications

• Humidifier Specifications

• Air / Oxygen Entrainment Mixer Specifications

• Oxygen Blending Bag Kit Specifications

Section 3 . . . . . . . . . . DESCRIPTION OF CONTR

ALARMS & CONNECTORS

• Front Panel Overview

• Front Panel Controls & Indicators

• Front Panel Alarms

• Front Panel Message Display Window

• Left Side Connectors

• Right Side Connectors

• Optional Accessories

• User Set Up

Section 4 . . . . . . . . . . THEORY OF OPERATION

• General System Ov

• A/CMV Mode (Assist/Control Mandatory Ventilation)

• SIMV Mode (Synchronized Intermittent Mandatory Ventilation)

• SPONT Mode (Spontaneous Ventilation)

• P support (Pressure Support)

• Pressure Control Ventilation

• Volume Control Ventilation

• Back-Up Ventilation

erview

OLS, INDICATORS,

SERHT50NA A0808

Page 4

Section 5 . . . . . . . . . . CALIBRATION AND OPERATION VERIFICATION

• Introduction

• Test Equipment Required

• Pre-Test Inspection

• Front Panel Test / Alarm Check

• System Leak Test

• Pressure Transducer Calibration

• Pressure Meter Calibration

• Volume Factor Calibration

• Pressure Relief Valve Calibration

• Exhalation Valve Calibration

• Operational Set-Up (Standard Test Settings)

• Pressure Verification

• P trig

• PEEP / CPAP

• Pressure Control

• Exhalation Valve Sealing

• Manual Inflation

• High Paw Alarm

• Low Paw Alarm

• Check Prox Line Alarm

• Battery Test

• Humidifier (for HT50-H)

• OVP Test Record

Section 6 . . . . . . . . . . MAINTENANCE PR

• Introduction

• Tools Required

• Parts Required

• Routine Maintenance Procedure

• Annual Maintenance Procedure

• 10,000 Hour Maintenance Procedure

Section 7 . . . . . . . . . . TR

OUBLESHOOTING

• Introduction

• Mechanical and Pneumatic Troubleshooting

• Electronic Troubleshooting

OCEDURES

SERHT50NA A0808

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Section 8. . . . . . . . . . ELECTRONIC & PNEUMATIC COMPONENT REMOVAL &

REPLACEMENT PROCEDURES

• Introduction

• Tools Required

• Discharge the HT50 Power Supply

• Disassembly (Lower Case)

• Internal Battery Assembly Replacement

• Pump Assembly Replacement

• Outlet Assembly Replacement

• Humidifier Heater Assembly Replacement

• Front Panel Board Replacement

• Front Panel Bezel Replacement

• Main Board Assembly Replacement

• Power Supply Board Replacement

Section 9 . . . . . . . . . . DIAGRAMS AND PARTS LISTS

• Figure 9-1, Internal View Figure 9-2, Final Assembly, Front View HT50-H

•

• Figure 9-3, Final Assembly, Front View HT50-H1

• Figure 9-4, Main Board with Mounting Hardware

• Figure 9-5, Main Board Tubing Connection, Left Side

• Figure 9-6, Right Side Case

• Figure 9-7, Front Panel, Side View

• Figure 9-8, Pneumatic Schematic

• Drawing Parts Reference List

Section 10 . . . . . . . . . REPACKAGING AND SHIPPING INSTRUCTIONS

Appendix A . . . . . . . . HT50 PARTS AND ACCESSORIES

SERHT50NA A0808

• Introduction RGA (Return Goods Authorization)

•

• Packaging: Complete Unit

• Packaging: Parts or Accessories

• HT50

Ventilator Parts and Accessories

• Service Parts List

Page 6

1. OPERATOR’S RESPONSIBILITY

Operator’s Responsibility for Patient Safety . . . . . 1-1

Limitation of Liability. . . . . . . . . . . . . . . . . . . . . . . . 1-2

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Typing Conventions . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . 1-4

Factory Maintenance or Repair . . . . . . . . . . . . . . 1-7

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . 1-8

SERHT50NA A0808

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OPERATOR’S RESPONSIBILITY FOR PATIENT SAFETY

The Operation manual (p/n OPRHT50-NA) contains information intended to ensure safe and effective ventilator use. The label on the inside of the front panel cover door is meant to complement not replace the Operation manual.

The design of the HT50 ventilator, the Operating and Service manuals, and the labeling on the ventilator take into consideration that the purchase and use of the equipment is restricted to trained professionals, and that certain inherent characteristics of the ventilator are known to the operator. Instructions, warnings and caution statements are therefore limited to the specifics of the Newport HT50.

Caution Federal law restricts this device to sale by or on the order of a physician.

SECTION 1

This man

ual excludes references to various hazards which are obvious to medical professionals and operators of this equipment, to the consequences of product misuse, and to potentially adverse effects in patients with abnormal conditions.

When the HT50 is used in home care and sub acute environments it is important that the primary caregiver has received training and has demonstrated competency in all equipment functions. A specific written care plan must be established by the attending physician.

Transport of patients with the HT50 requires that medical staff have a good working knowledge of the ventilator’s use and problem resolution. Proper emergency back-up equipment must be immediately available during transport.

HT50 operators must recognize their responsibility for implementing safety monitoring mechanisms which supply appropriate information on equipment performance and patient condition. Patient safety may be achieved through a wide variety of means such as electronic surveillance of equipment performance and patient condition. However, equipment surveillance should not replace direct observation of clinical signs. The HT50 operator is solely responsible for selecting the appropriate level and method of patient monitoring.

SERHT50NA A0808 1-1

Product modification or misuse can be dangerous. Newport Medical Instruments, Inc. (N

EWPORT) disclaims all liability for the

consequences of product alterations or modifications, as well as for the consequences which might result from the combination of this ventilator with other products, whether supplied by Newport or by other manufacturers, unless such a combination has been specifically endorsed by Newport.

Page 8

OPERATOR’S RESPONSIBILITY

LIMITATION OF LIABILITY

The liability of Newport Medical Instruments, Inc. (NEWPORT) is subject to and limited to the exclusive terms and conditions as set forth herein. Said liability is limited whether arising out of, or related to, the manufacture and sale of goods, their installation, demonstration, sales representation, use, performance, or otherwise. Any liability based upon product warranty, whether breach of warranty or otherwise, is limited regardless of any fault attributable to N breach of warranty, negligence, and strict liability).

The expressed warranties are in lieu of all other warranties, expressed or implied, including, without limitation, warranties of merchantability, fitness for any purpose, or noninfringement.

EWPORT shall not be liable for any special incidental or

N consequential damages incurred by the buyer to a third party. The buyer shall not be entitled to make liability recoveries from N due to such situations.

EWPORT and the nature of the action (including

EWPORT

WARRANTY

The Newport HT50 Ventilator is guaranteed to be free of defects for a period of two (2) years from date of delivery. The following are exceptions to this warranty:

1. Defects caused by misuse, mishandling, tampering, or by modifications not authorized by Newport Medical Instruments, Inc. (N

EWPORT) or its representatives.

2. Rubber and plastic components and materials are guaranteed to be free of defects at time of delivery.

3. The internal batteries are warranted for six months.

Any product which proves to be defective in workmanship or material will be replaced, credited, or repaired. Newport retains the discretion to select the most suitable of these options. Newport is not responsible for deterioration, wear, or abuse. In all cases, Newport will not be liable beyond the original selling price.

Application of this warranty is subject to the following conditions:

1-2 SERHT50NA A0808

EWPORT or its authorized representatives must be promptly

1. N notified upon detection of the defective material or equipment.

2. Defective material or equipment must be returned to N or its authorized representative.

EWPORT

Page 9

SECTION 1

DEFINITIONS

3. Examination b confirm that the defect is covered by the terms of this warranty.

To ensure complete protection under this warranty, the Warranty Registration Card must be returned to Newport within ten (10) days of equipment receipt.

The above is the sole warranty provided by N warranty, expressed or implied, is intended. Representatives of Newport are not authorized to modify the terms of this warranty.

WARNING Possibility of personal injury, to patient or others, if disregarded.

Caution Possibility of equipment damage if disregarded.

NOTE: Additional information intended to avoid inconveniences

during operation. followed.

y NEWPORT or its authorized representatives must

EWPORT. No other

Notes also indicate important procedures to be

TYPING CONVENTIONS

Inspection: Examination of actual condition.

Service: Measures required to maintain a specified condition.

Repair: Measures required to restore a specified condition.

Maintenance: Required inspection, service, and repair of the

device.

Preventive Maintenance: Maintenance performed at regular

vals to keep the device in good working condition.

inter

Within the text of this manual, controls, alarms, and indicators are designated by the labeling name as they appear on the ventilator, e.g.: Psupport (pressure support), Ptrig (pressure trigger), and SPONT (spontaneous mode).

Please review all WARNINGS and Cautions outlined in this

ual prior to servicing the HT50 for the first time.

man

SERHT50NA A0808 1-3

Page 10

OPERATOR’S RESPONSIBILITY

WARNINGS AND CAUTIONS

At all times, strictly follow this Manual.The safe use of the HT50 Ventilator requires a full understanding of its operation and adherence to the manual’s instructions.The equipment is only to be used for the purpose specified under “Intended Use” (see Section

2). Observe all of the WARNINGS and Cautions posted in this man accessories.

General Warnings

External power connection: To maintain grounding integrity when using A.C. power, only connect to hospital grade receptacles. Always disconnect the external power supply prior to servicing. Always use the power cord supplied with the HT50. Make certain the power cord ferrite is always attached to the A.C. power cord to ensure that the HT50 meets EMC requirements.

There is a risk of explosion if used in the presence of flammable anesthetics.

ual and on labels found on the HT50 Ventilator and associated

All settings and adjustments in the different ventilation modes must be made in accordance with a physician’s prescribed therapy.

EWPORT cannot warrant or endorse the safe performance of third

N party humidifiers for use with the HT50.

When the HT50 is operating on battery power, the optional built-in humidifier does not function. A heat moisture exchanger, or other humidification device, should be used until the unit is connected to A.C. power at which time the built-in humidifier can be used.

Do not use electrically conductive patient circuits.

Always use a clean patient circuit.

Always use an inline filter (p/n HT6004701 or equivalent) at the Airway Pressure Connector to protect the internal transducers from moisture or other contaminants.

Always use appropriate monitors to ensure sufficient oxygenation and ventilation (such as pulse oximeter and/or capnograph) when the HT50 Ventilator is in use on a patient.

The ventilator is ready for operation only when: a) It is completely assembled, and; b) The Quick Check Procedure, including the Exhalation Valve

Calibration (see Appendix A, Operating Manual) or OVP (Service Manual) has been successfully completed.

1-4 SERHT50NA A0808

Constant attention by qualified medical personnel is recommended whenever a patient is ventilated with the HT50.

Page 11

SECTION 1

When the HT50 is used in homecare environments

, proper education and training of the appointed caregiver must be provided prior to the patient leaving the health care facility.

If a fault is detected in the ventilator and its life support functions are in doubt, immediately discontinue use; use an alternative method of ventilation until the fault has been corrected. Contact

EWPORT Technical Service Department immediately.

Failure to identify and correct alarm violations may result in patient injury.

Continuous oxygen monitoring is required for patient safety. The HT50 does not have a built-in alarm system to notify user of a failure or disconnection of the oxygen source.

Ensure that the oxygen source is not empty before and during the use of the optional Air/Oxygen Entrainment Mixer or Oxygen Blending Bag Kit.

The primary internal battery should be replaced every 12 months or sooner if the use time no longer meets the needs of the user.This will depend on a number of factors including settings and usage patterns. The secondary internal battery should be replaced every 24 months.

Please recognize that any life support equipment should have appropriate alternate power sources and means of ventilation readily available in case of a mechanical or system problem. If you need alternative power sources, contact Newport Medical Instruments Inc.

When the HT50 is used for transport applications, ensure that the internal battery system is fully charged prior to use.

When the Battery Empty audible alarm sounds continuously, only a limited time of internal battery power remains and an alternate power source should be found immediately.

Frequent deep discharge of the internal battery system will decrease the amount of time the HT50 will operate on battery power from a full charge state.

If you use the internal battery system as your primary power source, replace the primary battery as needed to ensure that the battery operation time is sufficient.

SERHT50NA A0808 1-5

Page 12

OPERATOR’S RESPONSIBILITY

Charge the internal battery system for a minimum of 8 hours before powering the ventilator from the internal batteries. This will provide approximately 80% of the battery charge. If the battery system is completely depleted, it will take approximately 10 hours to fully recharge.

Always ensure that the green Ext. Pow er LED lights after connecting the HT50 to an e take up to two minutes to light). If the LED does not light, check all power connections and resolve any problems.

Always plug the HT50 into an external power supply source when not in use to insure best battery performance. The flow resistance of the air inlet filter, located on the right side of ventilator, is likely to increase with repeated use. Ensure that the filter is changed regularly.

The HT50 Ventilator is guaranteed to perform to specification when the Newport HT50 breathing circuit with exhalation valve is used. See Appendix B for circuit configurations and parts list.

xternal AC or DC power source (it can

Only N

EWPORT approved exhalation valves can be used with

the HT50.

Perform an exhalation valve calibration each time a clean circuit/exhalation valve is installed.

The functioning of this machine may be adversely affected by the operation of equipment, such as high frequency surgical (diathermy) equipment, defibrillators or short-wave therapy equipment in the vicinity.

This equipment has been tested and found to comply with the EMC limits for the Medical Device Directive 93/42/EEC (EN55011 Class A and EN 60601-1-2). These limits are designed to provide reasonable protection against harmful interference in a typical medical installation. The equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with these instructions, may cause harmful interference to other devices in the vicinity. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference with other devices, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

1-6 SERHT50NA A0808

• Reorient or relocate the receiving device

• Increase the separation between the equipment

Page 13

SECTION 1

Cautions

• Connect the equipment into an outlet on a circuit diff from that to which the devices(s) is connected

• Consult the manufacturer or field service technician for help.

Only use medical grade oxygen with the Air/Oxygen Entrainment Mixer or Oxygen Blending Bag Kit.

Do not place liquid containers in the immediate vicinity or on top of the HT50. Liquids that get into the ventilator can cause equipment malfunction and damage.

After servicing an HT50, it must completely pass an Operational Verification Procedure (see Service Manual) before being returned to patient use.

An authorized Newport Medical Instruments factory-trained technician must do all service or repairs performed on the HT50.

Do not open the ventilator or perform service on an open unit while connected to external power.

erent

Use standard anti-static techniques while working inside the ventilator or handling any electronic parts.

Clean all external parts of the ventilator prior to servicing.

Water in the oxygen supply can cause equipment malfunction and damage.

Always replace a blown fuse with one of proper rating for corresponding voltage range.

NOTE: Review HT50 Oper (Section 4 of this manual) before servicing the ventilator.

NOTE: Use the tools and equipment specified in this manual to perf

Batteries contain materials that can harm the environment. Do not discard them in an incinerator or force them open. Batteries cannot be disposed of with normal waste.

Factory Maintenance or Repair

ating Manual and Theory of Operation

orm specific procedures.

SERHT50NA A0808 1-7

Scheduled maintenance or repair services are available from the Newport Technical Service Department. To send your ventilator in for service, see HT50 Service Manual for repackaging and shipping instructions.

Page 14

OPERATOR’S RESPONSIBILITY

Current pricing for scheduled maintenance and labor rates can be found in Newport Medical Instruments Annual Price List. To obtain a copy, please contact your local Newport Sales Representative or contact our Customer Service Department using information below.

Contact Information

Address: Newport Medical Instruments, Inc.

Phone numbers: Toll-free within the United States:

Fax numbers: Main fax: 1.714.427.0489

1620 Sunflower Ave Costa Mesa, California, USA 92626

800.451.3111 Worldwide: 1.714.427.5811

Technical Ser

Website: www.NewportNMI.com /

www

.ventilators.com

Email: Info@NewportNMI.com Department

extensions: Customer Service: 282

echnical Service: 500 (24-hour pager activated

after Technical Service department hours) Clinical Support: 123 (24-hour pager)

Corporate Office Monday through Frida hours: (USA Pacific Time)

Technical Service Monday through Friday, 7:00 am to 4:00 pm hours: (USA Pacific Time)

HT50s distributed internationally have CE authorization (HT50-H, HT50H1) and are represented by: Obelis, s.a. , 34 Ave de Tervuren, bte 44, B1040 Brussels, Belgium. Tel: +32.2.732.59.54 Fax:+32.2.732.60.03 email:mail@obelis.net

vice fax: 1.714.427.0572

y, 8:00 am to 5:00 pm

1-8 SERHT50NA A0808

Page 15

2. SPECIFICATIONS

Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Symbols / Labeling Table . . . . . . . . . . . . . . . . . . . . 2-1

Controls / Alarms / Monitors . . . . . . . . . . . . . . . . . 2-2

Hardware Requirements . . . . . . . . . . . . . . . . . . . . 2-5

Miscellaneous Specifications . . . . . . . . . . . . . . . . . 2-5

Humidifier Specifications . . . . . . . . . . . . . . . . . . . . 2-7

Air / Oxygen Entrainment Mixer Specifications . . . 2-8

Oxygen Blending Bag Kit Specification . . . . . . . . . 2-8

SERHT50NA A0808

Page 16

INTENDED USE

SECTION 2

This device is intended to provide continuous or intermittent mechanical ventilator support for the care of individuals who require mechanical ventilation. The ventilator is a restricted medical device intended for use by qualified, trained personnel under the direction of a physician. Specifically, the HT50 is applicable for adult and pediatric (i.e. infant, child and adolescent) patients, greater than or equal to 10 kg or 22 lbs., who require the following general types of ventilatory support, as prescribed by an attending physician: positive pressure ventilation with assist/control, SIMV and SPONT modes of ventilation. The HT50 is suitable for use in hospital, sub-acute, emergency room, home care environments as well as for transport and emergency response applications.

Front panel controls allow trained operators to select between a number of operational modes, pressure support and volume or pressure control. A comprehensive alarm system is built-in to alert the user to violations of set safety limits. When new and fully charged, the internal battery system provides up to 10 hours of power. With its patented, self-contained gas supply source, the HT50 requires no external air compressor.

Main Power On

Main Power Standby

Equipotentiality

Refer to Operating Manual

Alarm Setting

Audible Alarm Silence/Reset

▲

High Alarm Set High Alarm

▼

Low Alarm Set Low Alarm

▲

▼

Applied Parts Type BF

SERHT50NA A0808 2-1

Page 17

SPECIFICATIONS

SYMBOLS/LABELING TABLE

Controls/Alarms/Monitors Range/Selection

1. MODE (Pressure or A/CMV Volume Control) SIMV

SPONT

2. Volum e C ont rol (Tidal Volume) 100 to 2,200 mL, ATPS, ± 10%

3. Pressure Control PEEP + 5 to 60 cmH (Target Pressure)

•

(Flow) 6 to 100 L/min

5. t

(Inspiratory Time) 0.1 to 3.0 sec

6. ƒ (Frequency) 1 to 99 b/min

7. P trig (Sensitivity) –9.9 to 0 cmH

O / mbar, pressure triggering

(Patient Effort Indicator LED blinks once each time the airway pressure reaches the Ptrig setting.)

8. PEEP/CPAP 0 to 30 cmH

9. P support (Pressure Support) 0 to 60 cmH

O / mbar

O / mbar above baseline pressure,

limited to PEEP + Psupport <

10. I:E Ratio 1:99 to 3:1

11. Maximum Limited Airway 100 cmH

O (98 mbar)

Pressure (Safety Valve)

12.

Manual Inflation 3 sec maximum

(While b

utton is pushed, the ventilator closes the exhalation

valve and delivers a operator controlled breath to the patient.)

O / mbar

60 cmH2O / mbar

13. Humidifier (Optional) 19ºC to 39ºC

14. Airway Pressure Meter –10 to 100 cmH

15. Alarm Silence/Reset Button Pressing button silences an audib

& Indicator seconds and resets a latched alarm indicator. LED lights to

16. ALARMS Indicators Indicators for violated alarms blink red. When the alar

17. Int. Battery Button & Indicator Pressing button displays the internal battery charge level in the

2-2 SERHT50NA A0808

O / –10 to 98 mbar

le alarm violation for 60

indicate that Silence is activ

m is no longer violated, the indicator latches (stays lit). Cancel a latched indicator by pressing the Silence/Reset button.

airw

ay pressure meter (Paw) window when operating on the internal battery system for accurate reading. LED lights to indicate internal battery system operation and alarms.

Page 18

Controls/Alarms/Monitors Range/Selection

SECTION 2

18. FIO

19.

(with optional accessories)

On / Standby Button Press once to put in Setting condition. (On-Setting/LED off)

0.21 to 1.00

Press again to begin v

entilating (On-Ventilating/LED on). When the HT50 is ventilating, press two times to put ventilator into Standby/Off condition (LED off).

20. Push To Unlock Buttons & Pressing button unlocks front panel buttons if locked by Indicator automatic panel lockfeature. Auto lock is enabled/disabled in User

Set Up

. LED lights to indicate panel is locked.

21. Alarms

▲Paw (High Pressure) 4 to 99 cmH ▼Paw (Low Pressure) 3 to 98 cmH

O / 4 to 99 mbar, must be 1< Low Paw

O / 3 to 98 mbar, limited by > PEEP + 3 and High

Paw -1 Low Baseline Pressure Paw < High Baseline Pressure Paw >

PEEP - 3 cmH2O/mbar for 3 sec during exhalation PEEP + 8 cmH

O/mbar at onset of a breath or 3 sec

after the start of exhalation Occlusion Paw >

PEEP + 15 cmH2O/mbar at onset of a breath or 3 sec

after start of expiration Apnea 30 sec ± 3 sec PCV Not Reached Paw P < 50% of PCV setting

•

Insp. Min. Volume 1.1 to 50.0 L/min

▲V

•

Insp. Min. Volume 0.1 to 49.0 L/min

▼V

Check Prox Line Prox Paw does not match machine Paw during inspiration Humidifier (5 messages) Humidifier malfunction/disconnection Power Switchover External power to internal battery switchover alert Battery Low Minimum of 30 minutes battery time remains until shutdown Battery Empty Minimum of 15 minutes battery time remains until shutdown

NOTE: The time between the Battery Low Alarm violation and the Battery Empty Alarm violation will vary depending on the v Alarm will occur much sooner after the Battery Low Alarm, than it will at lower volumes and pressures. In all cases, the stated minimum times for each alarm will be met, even if the two alarms occur almost simultaneously.

Device Alert (5 messages) Ventilator malfunction: FAULT BAT SYS, OCCLUSION, 10V

Shut Down Alert On to Standby/Off Shut Down Alert

SERHT50NA A0808 2-3

entilator load. At high volumes and pressures, the Battery Empty

SHUTDOWN, SYSTEM ERROR or MOTOR FAULT

Page 19

SPECIFICATIONS

22. Message Display Window

Up to 16 characters, LED alpha numeric display

yed monitored parameters:

Displa

VT(Actual delivered tidal volume)

•

(Inspiratory minute volume)

ƒ (Total breath frequency)

Paw P (Peak airway pressure) Paw M (Mean airway pressure) Paw B (Baseline airway pressure) H (Hours of operation) S (Software version) L (or Q) (Buzzer volume (Loud or Quiet) for audible alarm)

Other displayed parameters (In USER SET UP):

Power Save (On / Off) Airway Pressure Units (cmH Set Up (User / Default) Auto Panel Lock (Enabled / Disabled) Tech. Setup (Technical set up, refer to Service Manual)

23. Front Panel Indicators

Modes

A/CMV Green LED indicates that A/CMV mode is active. SIMV Green LED indicates that SIMV mode is active. SPONT Green LED indicates that SPONT mode is active.

O / mbar)

Contr

ols

Volume Control Green LED indicates Volume Control ventilation. Pressure Control Green LED indicates Pressure Control ventilation.

Alarms

▲Paw (High Pressure) Red LED indicates high peak airway pressure, high baseline

pressure, or occlusion alarm violation.

▼Paw (Low Pressure) / Apnea Red LED indicates low peak airway pressure, low baseline

pressure

, apnea, or PCV (50% of PCV setting not achieved)

alarm violation.

Device Alert Red LED indicates ventilator malfunction alert.

•

▲V

(High Insp. Min. Volume) Red LED indicates high inspiratory minute volume alarm limit is

•

▼V

(Low Insp. Min. Volume) Red LED indicates low inspiratory minute volume alarm limit

(Back-Up Vent) is violated.

Misc.

Indicators

violated.

Silence / Reset Yellow LED indicates that the audible alarm is silenced for 60

seconds. Auto Lock On Green LED indicates that the panel is currently locked. On / Standby Green LED indicates that the HT50 is ventilating. Ptrig Green LED blinks on to indicate patient breathing effort.

•

(Flow) Green LED indicates that Flow is displayed in the V•/ I:E Ratio

numeric window display. I:E Green LED indicates that the I:E Ratio is displayed in the V

•

/ I:E Ratio numeric window display. Blinking LED indicates a breath with an inverse I:E Ratio.

2-4 SERHT50NA A0808

Page 20

SECTION 2

Ext. P

ower / Green LED indicates external power is on and the internal

Charging Int. Battery battery is being charged. Red LED indicates power switchover

to internal battery.

Int. Battery (Push to Test) Yellow LED indicates internal battery is in use. LED blinks

yellow to indicate Battery Low alarm condition or blinks red to indicate Battery Empty alarm condition.

Humidifier On Green LED indicates humidifier is active. LED blinks yellow to

indicate humidifier alarm condition.

Hardware Requirements

24. Electrical Applied parts type BF

25. External A.C. /D.C. (Battery 100-240 VAC, max. 2 A Input) 50 / 60 / 400 Hz

12-30 VDC, max. 12 A

26. Dual Internal Battery Primary battery: lead acid, 12 VDC, 5 AH

Secondary back up battery: nickel metal hydride,12 VDC, 2.1 AH When new and fully charged, the Dual Pac internal battery supplies power for up to 10 hours of operation at these settings: A/CMV mode, ƒ=15, Volume Control=500 mL, tI=1.0 sec, PEEP=Ø, max. airway pressure 30 cmH Save mode ON.

O/mbar, Power

NOTE: The Dual Pac internal battery charges whenever the HT50 is connected to an external power source. Battery charge level is best maintained by keeping the HT50 continuously connected to external power.

NOTE: The primary internal batter

y capacity diminishes with age. As the battery ages the Battery Low alarm will occur sooner. If this begins to infringe on the needed battery time, prior to scheduled replacement, the primary internal battery should be replaced.

27. RS-232C Interface /Remote 8 pin SEMCONN connector. Operates at 19,200 baud. Allows Alarm Output put for interfacing with central alarms systems.

28. Pneumatics Gas delivery system requires no external air compressor.

Miscellaneous Description

29. Operating Temperature –18ºC to 50ºC

NOTE: For proper operation at low range temperatures (-18°C),

the HT50 must be star environment and allowed to run for 30 minutes prior to transfer to colder environment.

NOTE: At temperatures ove disabled and the internal battery does not charge.

ted in a normal room temperature

r 40ºC the charging circuit is

30. Operating Humidity 15 to 95% non-condensing

31. Operating Altitude Sea level to 15,000 ft (0 to 4,572 m)

SERHT50NA A0808 2-5

There is no altitude limitation when HT50 is oper pressurized environment.

ated in a

Page 21

SPECIFICATIONS

32. Operating Pressure 600 to 1,100 mbar

33. Regulatory and Agency Complies with the following international standards & requirements: Standards/Requirements Testing and evaluation of the NEWPORT HT50

entilator has been conducted in compliance with the following

V voluntary standards:

IEC 60601-1:1988 (+A1:1991 +A2:1995; EN 60601-1:1990 +A1:1993 +A2:1995 +A3:1996) Medical Electr Part 1: General Requirements for Safety CEI/IEC 60529:2001 Degrees of Protection Provided by Enclosures (IP Code) MIL-STD-810E Environmental Test Methods and Engineering Guidelines IEC 601-2-12:1988 Particular Requirements for the Safety of Lung

Ventilators for Medical Use

IEC 60601-1-2:2001 (+A1:2006) Medical Electrical Equipment, Collater Requirements and Tests

IEC 68-2-6 Test Fc Environmental Tests: Vibration (sinusoidal) IEC 68-2-29 Test Eb Environmental Tests: Bump IEC 68-2-32 Test Ed Environmental Tests: Free Fall IEC 68-2-36 Test Fdb Environmental Tests: Random Vibration ISO 8185:1997 Humidifiers for Medical Use: General

Requirements f ASTM F 1100-90:1990 Standard Specifications for V Intended for Critical Care Use ASTM F 1246-91:1991 Standard Specifications for Electrically P

owered Home Care Ventilators - Part 1: Positive-Pressure

Ventilators and Ventilator Circuits DO-160D Environmental Conditions and Test Procedures for Airbor

al Standard: Electromagnetic Compatibility -

or Humidification Systems

ne Equipment

ical Equipment -

entilators

34. Storage Temperature –40ºC to 65ºC

35. Storage Humidity 0 to 95% non-condensing

36. Height (includes handle) 10 inches (26 cm)

37. Width 11 inches (27 cm)

38. Depth 8 inches (20 cm)

39. Weight 16.7 lbs. (7.6 kg) without humidifier

18.0 lbs

40. Patient Range Adult - Pediatric (i.e. infant, child & adolescent) with

body w

. (8.2 kg) with humidifier

eight >

10 kg

2-6 SERHT50NA A0808

Page 22

41. Factory Default Parameters

atient Settings:

MODE A/CMV PEEP/CPAP 0 cmH2O Volume Control 500 mL P support 0 cmH t

1.0 sec Humidifier Off

ƒ 15 b/min Buzzer Volume Loud

O ▼Paw

O ▲Paw

•

Ptrig –1.0 cmH Paw Alarms 5 cmH

•

Alarms 3 L/min ▼V

40 cmH

20 L/min ▲V

User Set Up:

Power Save On Pressure Units cmH Auto Panel Lock Disabled Set Up User

SECTION 2

42. Patient Circuit Reusable 22 mm I.D. adult/pediatric circuit with 3/16 inch

(4.8

mm) I.D. proximal pressure sensing line, 1/8 inch (3.2 mm)

I.D. exhalation valve control drive line, and exhalation valve.

43. Exhalation Valve N

EWPORT'S HT50 exhalation valve (P/N HT600039) is

manufactured and designed specifically for the N Ventilator. N

EWPORT MEDICAL does not approve of the use of any

EWPORT HT50

type or brand of exhalation valve that has not been tested and approved by N

EWPORT MEDICAL for use with the HT50.

HT50-H, HT50-HB Humidifier Specifications

(operates on A.C. power only)

Set Target T

Operating Water V

Usable Volume of

ater Bottle: 265 mL

Compliance at Minimum

ater Level (Refill Line): 0.5 mL/cmH

emperature Range: 19ºC to 39ºC

olume: 300 mL

O / mbar @ 23ºC

Compliance at Maximum Water Level (Full Line): 0.33 mL/cmH

Intended Use: Adult and pediatric patients whose supraglottic airway is or is

SERHT50NA A0808 2-7

not b

ypassed.

O / mbar @ 23ºC

Page 23

SPECIFICATIONS

Warm-Up Time: 30 minutes

Gas Leakage: 2 mL/min at airway pressure of 80 cmH

O / mbar

Humidifier Output: 33.8 mg/L at a continuous flow of 10 L/min @ 39ºC

Maximum Operating

y Pressure: 100 cmH

Airwa

O / 98 mbar

Maximum Temperature at

atient Wye That

the P Triggers an Alarm: 41ºC

(optional) Air / Oxyg

en Entrainment Mixer Specifications

Pneumatic Requirements:

Oxygen 35 to 90 psig (2.4 to 6.2 Bar) full operating range

™

40 to 70 psig (2.7 to 4.8 Bar) accuracy

} .08

Air Atmospheric pressure

Control: adjusted continuously from 0.21 to 1.00

IO2

WARNING Continuous oxygen monitoring is required for patient

safety. The HT50 does not have a built-in alarm system to notify user of a failure or disconnect of the oxygen source.

(optional) Oxygen Blending Bag Kit Specifications

Pneumatic Requirements:

Oxygen 0-10 L/min (calibrated) Air Atmospheric pressure

Control: FIO2, indirectly adjusted from 0.21 up to 1.00

IO2

WARNING Continuous oxygen monitoring is required for patient

saf of a failure or disconnect of the oxygen source.

via oxygen flow (L/min)

ety. The HT50 does not have a built-in alarm system to notify user

2-8 SERHT50NA A0808

Page 24

3. DESCRIPTION OF CONTROLS,

INDICATORS, ALARMS & CONNECTORS

Front Panel Overview. . . . . . . . . . . . . . . . . . . . . . . 3-1

Front Panel Controls and Indicators . . . . . . . . . . . 3-5

Front Panel Alarms. . . . . . . . . . . . . . . . . . . . . . . . 3-14

Front Panel Message Display Window . . . . . . . . 3-23

Left Side Connectors . . . . . . . . . . . . . . . . . . . . . . 3-24

Right Side Connectors . . . . . . . . . . . . . . . . . . . . . 3-25

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . 3-26

User Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

SERHT50NA A0808

Page 25

FRONT PANEL OVERVIEW

Turning the HT50 On and Off

SECTION 3

The following is an overview of the HT50 front panel button functions. For an indepth description, please review FRONT PANEL CONTROLS AND INDICATORS.

The On/Standby button toggles between the following conditions:

Changing the MODE Control

Setting Condition Press the A/CMV, SIMV or SPONT button.The LED on the

On Condition Press the A/CMV, SIMV or SPONT button.The LED on the

Standby

Press On/Standby button once to go from Standby to Setting. Press again to tur

Standby: HT50 dormant. Setting: Enables setting of control parameters and exhalation

valv

On: Enables ventilation

NOTE: There is approximately a two second delay in going from

Standby to Setting condition. During this time, the HT50 performs a self test and will light all displa

The MODE control buttons ( A/CMV / SIMV / SPONT ) function differently in Setting and On conditions.

selected Mode will light g

selected Mode will b will read “PRESS AGAIN.” Press the button again within 5 seconds to confirm the mode change, or the previously selected mode will continue.

g Setting g On gg

n On. Press twice to go from On to Standby.

e calibration.

ys on the front panel.

reen to confirm the selection.

link green and the Message Display Window

Standby

Changing between Pressure Control and Volume Control

On Condition: A/CMV or SIMV Select—Adjust (▲Up / ▼Down)—Accept

SERHT50NA A0808 3-1

The Pressure Control and Volume Control buttons function differently when in A/CMV or SIMV in On condition compared to when in SPONT mode in On condition or Settings condition.

Select the Pressure Control or Volume Control button. Both the LED indicator and the target value will blink.

Adjust the blinking target value for the selected control with the ▲Up / ▼Down buttons.

To Accept the new control and target v desired control button (Volume or Pressure) a second time.

alue you must press the

Page 26

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

On Condition: SPONT or Setting Condition: A/CMV, SIMV, or SPONT

Select—Adjust (▲Up / ▼Down)—Accept

Select the Pressure Control or Volume Control button. Both the

LED indicator and target v

Adjust the blinking target value for the selected control with the ▲Up / ▼Down buttons.

Accept the new control and target value by either pressing the selected b new parameter for adjustment, or by waiting 5 seconds without making a change.

Note: The transition to a new pressure or volume target may require se

utton again; or by pressing another button to select a

veral breaths.

alue will blink.

Changing a Parameter (or Multiple Parameters)

Select—Adjust (▲Up / ▼Down)—Accept

Select the parameter by pressing the labeled button (i.e. ƒ, Ptrig,

The parameter’s numeric display will blink.

etc).

Adjust the numeric value with the ▲Up / ▼Down buttons.

Accept the value by either pressing the selected button again; or

by pressing another b adjustment, or by waiting 5 seconds without making a change.

Enabling/Disabling Auto Panel Lock

Auto Panel Lock can be enabled or disabled via User Set Up (see pg 3-27). When the Auto Panel Lock is enabled, the Panel will lock 30 seconds after the last button is pushed and the LED lights green. All touch buttons (except Silence/Reset and Internal Battery Test) are locked, preventing accidental parameter changes.

utton to select a new parameter for

3-2 SERHT50NA A0808

NOTE: Auto P

To temporarily unlock parameters when Auto Panel Lock is active, push the Push To unlock button for at least one second. The Panel will relock 30 seconds after the last button is pushed.

anel Lock is factory preset to “Disabled” (off).

Page 27

SECTION 3

SERHT50NA A0808 3-3

Figure 3-1

HT50 Ventilator Front Panel

(model HT50-H1, HT50-H1B)

Page 28

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

Newport HT50-H, HT50-HB (with built-in humidifier)

3-4 SERHT50NA A0808

Figure 3-2

Page 29

FRONT PANEL CONTROLS & INDICATORS

Front panel controls that have corresponding LED indicators are included with the description of the control.

The HT50 front panel is shown in Figure 3-1 on pg 3-3.

On / Standby

This button toggles between the following conditions:

Standby (if attached to external power, the battery is being charged)

g Setting (allows setting of control parameters) g On (enables

ventilation)

Standby: The HT50 is dormant and ventilation is not enabled. If attached to e LED is lit green, indicating that the internal battery is being charged. The On/Standby indicator is not lit.

Setting: Pressing the On/Standby button once changes the

entilator from Standby to Setting condition.

Standby

xternal power, the Ext. Power/ Charging Int. Battery

SECTION 3

MODE Control

NOTE: There is approximately a two second delay in going from

Standb self test and will light all displays on the front panel.

During Setting condition, all adjustable LEDs are lit. This allows the operator to preset and adjust controls prior to ventilation. The On/Standby indicator is not lit. The Message Display Window shows “Press ON to Vent,” suggesting that the On/Standby button needs to be pressed if you want the HT50 to start ventilation.

On: Pressing the On/Standby b ventilator from Setting to On. In the On condition, the HT50 is ventilating and the On/Standby indicator is lit green.

Pressing the On/Standby button twice while in On condition turns the ventilator from On to Standby.

The MODE control buttons enable the user to switch between the following operational modes:

• A/CMV

• SIMV

• SPONT

y to Setting condition. During this time, the HT50 performs a

utton once more changes the

SERHT50NA A0808 3-5

In A/CMV and SIMV, mandatory breaths can be pressure controlled or volume controlled. A green LED indicates which operational mode is active.

Page 30

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

If the HT50 is in Setting condition, changes are made by pressing the requested MODE button once. If in ON condition, changes are made by pressing the requested MODE button twice. After the first press, the Message Display Window reads “PRESS AGAIN” and the requested MODE’s indicator starts to blink. If the requested MODE button is not pressed within 5 seconds, the change is cancelled.

A/CMV (Assist / Control Mandatory Ventilation)

In A/CMV, the user may choose to pressure or volume control mandatory breaths. In either case, all breaths delivered to the patient, whether time (ventilator initiated) or patient-triggered, are the same.

The ƒ (frequency) setting determines the minimum number of time-triggered mandatory breaths delivered each minute. The Ptrig setting determines the airway pressure threshold that patient effort must reach to trigger additional mandatory breaths. If patient effort doesn’t cause airway pressure to drop enough to meet the Ptrig threshold, or if the patient doesn’t breathe, the HT50 will deliver the set ƒ (frequency) of mandatory breaths.

NOTE: If the Ptrig setting is not adjusted to a level that allows the patient’s inspir as CMV (control) mode.

atory effort to be detected, A/CMV mode performs

SIMV (Synchronized Intermittent Mandatory Ventilation)

In SIMV, the user may choose to pressure or volume control mandatory breaths. In either case, all mandatory breaths delivered to the patient, whether time (ventilator initiated) or patient-triggered, are the same. In addition, the user may choose to pressure support the spontaneous breaths in between mandatory breaths.

Unlike A/CMV, the ƒ (frequency) setting in this mode determines the total rather than the minimum number of time (ventilator) or patient triggered mandatory breaths delivered each minute.

The ƒ (frequency) setting also establishes a timing window which determines whether a patient trigger results in a mandatory breath or a spontaneous breath.

The Ptrig setting determines the airway pressure threshold that patient effort must reach to trigger mandatory breaths and also to trigger spontaneous breaths in between mandatory breaths.

3-6 SERHT50NA A0808

If patient effort doesn’t cause airway pressure to drop enough to meet the Ptrig threshold or if the patient doesn’t breathe, the HT50 will deliver the set ƒ (frequency) of mandatory breaths each minute.

Page 31

SPONT (Spontaneous Ventilation)

Up and ▼ Down Control

▲

SECTION 3

In this mode, all breaths are patient triggered by spontaneous efforts. Psupport (Pressure Support Ventilation) may be used to support spontaneous efforts. When PEEP/CPAP is set above 0, the ventilator mode is CPAP (without P support) or Bilevel Positive Airway Pressure (with Psupport).

The ▲Up/▼Down control buttons have multiple uses on the HT50.

1. Parameter Adjustment: Use the ▲Up/▼Down buttons to adjust v Control and Volume Control values), alarms, and humidifier setting (if available). Select the desired parameter by pressing its touch button once. The corresponding value (numerical display) will blink. Press the ▲Up control to increase or the ▼Down to decrease the affected parameter value changes when the ▲Up/▼Down controls are pressed and held. The v selected parameter button again, or (2) the user selects a different parameter, or (3) five seconds elapses. Pressing a parameter button without pressing either the ▲Up or ▼Down control b current value.

entilation control parameter values (including Pressure

. The value continuously

alue adjustment is accepted if (1) the user presses the

utton within 5 seconds causes the parameter to retain its

NOTE: If in the On condition and switching betw Control and Pressure Control, the value adjustment for the new breath type selected (Volume or Pressure) will be accepted as noted above, but the breath type (VC or PC) will only change if the user presses the new breath type control button again.

2. Monitored Information: The ▲Up/▼Down controls are used to access and displa Window. Monitored information includes volume, frequency, pressure values and operation information. See pg 3-23 for more information on the Message Display Window.

When the HT50 is ventilating, and there are no alarm messages displayed on the Message Display Window, press the ▲Up control

utton to access the monitoring information. Pressing the ▲Up

utton again allows you to scroll through the messages.

3. Changing Default Settings: The ▲Up/▼Down controls are also used in User Set Up to change a set up value Up on pg 3-27 for more details.

y monitoring messages in the Message Display

een Volume

. See User Set

SERHT50NA A0808 3-7

Page 32

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

(frequency)

Range: 1 to 99 b/min

ƒ (frequency) setting determines the minimum number of

The time triggered mandatory breaths in the A/CMV mode and the total number of mandatory breaths in the SIMV mode. The frequency or rate value is displayed in the window adjacent to the selector button.

The user is alerted to frequency settings which result in an inverse I:E Ratio by an audible beep and an “Inverse I:E” message in the Message Display Window. Attempts to continue increasing the value after this alert are permitted up to an I:E Ratio of 3:1.

(inspiratory time)

NOTE: In SPONT mode, the

can be preset.

Range: 0.1 to 3.0 sec

The tIsetting determines the inspiratory time for mandatory breaths (volume or pressure control). The selected time value is displayed in the window adjacent to the selector button. The user is alerted to tIsettings which result in an inverse I:E Ratio by an audible beep and an “Inverse I:E” message in the Message Display Window. Attempts to continue increasing the value after this alert are permitted up to an I:E Ratio of 3:1. If the inspiratory time setting causes the flow rate to reach the maximum or minimum level of the flow specification, adjustment of tIceases, a beep sounds, and a setting limitation message appears in the Message Display Window.

NOTE: In SPONT mode, the tIsetting is not utiliz can be preset.

NOTE: See pg. 3-24 for a list of setting limitation messages.

ƒ setting is not utilized but the value

ed but the value

Volume Control (tidal volume)

3-8 SERHT50NA A0808

Range: 100 to 2,200 mL, ATPS

NOTE: When Volume Control is first initiated, or when a large

change is made to the v to reach the volume setting.

Pressing this control button, followed by pressing the ▲Up/▼Down controls, allows the adjustment of the tidal volume setting. adjacent window displays the set tidal volume. See Theory of Operation, pg 4-5 for more details.

When the green Volume Control LED illuminates, the

olume setting, it may take 5 or 6 breaths

Page 33

SECTION 3

Pressure Control (target pressure)

If the V

olume Control setting causes the flow rate to reach the maximum or minimum level of the flow specification, adjustment of Volume Control ceases, a beep sounds, and a setting limitation message appears in the Message Display Window.

NOTE: See pg. 3-24 for a list of setting limitation messages.

NOTE: In SPONT mode, the Volume Control is not utilized but

alue can be preset.

the v

Switching from Pressure Control to Volume Control:

Press the Volume Control button. The set tidal volume is displayed in the adjacent windo

w if the HT50 is ventilating. A “PRESS AGAIN”

message appears in the Message Display Window.

Adjust the tidal volume level by pressing the ▲Up/▼Down controls while the LED and n

umerical display are blinking. If the HT50 is ventilating you will need to Press the Volume Control button again within 5 seconds following adjustment.

Range: 5 to 60 cmH2O / mbar NOTE: When Pressure Control is first initiated or the setting is

changed, the first f

ew breaths may cycle off early until slope/rise is optimized. If early cycling off continues, re evaluate the breathing circuit configuration and lengthen the tubing as necessary.

Pressing this control button, followed by pressing the ▲Up/▼Down controls, allows the adjustment of the target airway pressure setting. T

arget pressure is referenced to ambient (atmospheric pressure). When the green Pressure Control LED illuminates, the adjacent window displays the set airway pressure. See Theory of Operation pg 4-4 for more details.

NOTE: In SPONT mode, the Pressure Control is not utilized b

the value can be preset.

Switching fr

om Volume Control to Pressure Control:

Press the Pressure Control button. The set target airway pressure value is displayed in the adjacent window if the HT50 is v

entilating. A “PRESS AGAIN” message appears in the Message

Display Window.

Adjust the set target airway pressure by pressing the ▲Up/▼Down controls while the LED and numerical display are

linking. If the HT50 is ventilating you will need to press the

b Pressure Control button again within 5 seconds following adjustment.

SERHT50NA A0808 3-9

NOTE: The minimum target airway pressure is 5 cmH above set baseline pressure.

O / mbar

Page 34

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

Ptrig (sensitivity)

Range: 0.0 to –9.9 cmH2O/mbar

The Ptrig setting determines trigger sensitivity in terms of how far airway pressure must drop below the set baseline pressure for a patient’s spontaneous efforts to be detected. The Ptrig LED indicator illuminates each time the airway pressure reaches the set Ptrig level, and turns off once the airway pressure has returned to baseline pressure. The blinking Ptrig LED is referred to as the Patient Effort Indicator. The P trig value is displayed in the adjacent window. Set Ptrig as close to 0.0 cmH without autotriggering to maximize triggering synchrony.

PEEP/CPAP

Range: 0 to 30 cmH2O/mbar

The PEEP/CPAP setting establishes airway pressure in the patient circuit during the exhalation phase. It is also referred to as base or baseline pressure. The set PEEP/CPAP value is displayed in the adjacent window.

O as possible

Psupport (pressure support)

NOTE: In Pressure Control ventilation, PEEP/CPAP cannot be

set higher than 5 cmH

O/mbar below the set Pressure Control

setting. NOTE: The value of PEEP/CPAP plus Psupport cannot exceed

60 cmH

O/mbar.

Range: 0 to 60 cmH2O/mbar

The Psupport (pressure support) setting determines the target rise/change in pressure during inspiration for patient triggered spontaneous breaths in SIMV and SPONT modes. The target pressure is the set Psupport plus the PEEP level.

Any time the active Psupport control is pressed, Psupport flow delivery slows to a lower level then it gradually increases to the appropriate level as pressure rise is re-assessed.

NOTE: The value of PEEP/CPAP plus Psupport cannot exceed 60

O/mbar.

cmH

3-10 SERHT50NA A0808

Page 35

Manual Inflation

SECTION 3

Range: 0 to 3.0 sec

Pressing this button delivers an operator initiated Manual Inflation. Pressing the Manual Inflation button will not initiate an inflation if the patient is currently in the inspiratory phase of a breath or if airway pressure is > 5 cmH level. Manual Inflation delivers the set flow rate (in Volume Control) or the set target pressure (in Pressure Control), but inspiratory time is controlled by the user.

During Manual Inflation, the breath is terminated if (1) the Manual Inflation button is released, or (2) the ▲Paw (High Pressure)

m is violated or (3) three seconds have elapsed.

alar

NOTE: Manual Inflation is only available in A/CMV and SIMV modes.

NOTE: Manual Inflation may be prematurely cycled off in the first

veral breaths in Pressure Control when the initial flow has not yet

se been optimized.

O (mbar) above the set PEEP/CPAP

Humidifier On Button

(HT50-H, HT50-HB only)

Range: 19ºC to 39ºC

This touch button activates the b

uilt-in humidifier. Pressing this button displays the set target temperature in the adjacent window. While the display is blinking, use the ▲Up/▼Down controls to adjust the target temper

ature. When temperature adjustment is complete and (1) five seconds have elapsed without touching the control, (2) the Humidifier On button is pressed again, or (3) another parameter is selected for adjustment, the display stops blinking and the measured temperature is displayed. While the humidifier is On, the target temperature can be readjusted at any time by pressing the Humidifier On button and using the ▲Up/▼Down controls

NOTE: Preheating the humidifier for 30 minutes prior to beginning

entilation will improve the heating performance of the humidifier.

During ventilation (On condition) the displayed temperature is the measured temperature at the patient connector. In the Setting condition, the displayed temperature is the measured temperature at the humidifier bottle outlet.

SERHT50NA A0808 3-11

To turn the humidifier Off, press and hold the Humidifier On button for three seconds. See pg 5-11 for more details.

NOTE: The measured proximal temperature may be different from the set target temperature due to the environmental temper

ature, minute volume, patient temperature, etc.

Page 36

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

NOTE: The humidifier is operational only when the HT50 is

NOTE: If the humidifier and/or the temperature probe is removed or

ved prior to turning the

•

(mandatory flow)

malfunctions or if the humidifier bottle is remo humidifier off, the Humidifier On LED changes from green to blinking yellow, an audible alarm sounds and the heater shuts down automatically. To restart the humidifier, correct the alarm condition and press the Humidifier On button.

Range: 6 to 100 L/min

•

shares a numeric display window with I:E Ratio.

•

LED is illuminated green when flow is displayed.

Displays the calculated flow delivered from the ventilator during volume controlled mandatory breaths. V during Pressure Controlled breaths or SPONT mode.

NOTE: Flow can be adjusted indirectly by changing the tidal

olume (Volume Control) or tIsettings.

I:E Ratio (inspiratory time to expiratory time)

e: 1:99 to 3:1

Rang

I:E Ratio shares a numer I:E LED is illuminated green when I:E Ratio is displayed.

I:E Ratio is determined by the is longer than inspiratory time, the display format is 1:X.X. If expiratory time is shorter than tI, the display format is X.X:1. When the I:E Ratio is inverse, the I:E Ratio indicator illuminates once every breath. I:E Ratio does not function during SPONT mode.

Internal Battery Test Button and Indicator

When the HT50 is powered by the dual internal battery, the LED on this button illuminates. A yellow LED indicates the internal battery system is in use. A blinking yellow LED indicates low power. When the battery system is completely discharged, the LED blinks red.

•

display is not available

ic display window with V

ƒ and t

settings. If expiratory time

•

3-12 SERHT50NA A0808

Pressing this button allows the Int. Battery Charge Level to be read in the lower half of the Paw meter window. The battery charge level should only be tested when the HT50 is operating on the dual internal battery. Testing while plugged into any external power source will give inaccurate readings.

Test the HT50 dual internal battery periodically to verify that the charge level is in the blue area. The numbers on the Paw meter do not reflect the percent of charge.

Page 37

Internal Battery Charge Level Meter

The Int. Battery Charge Level meter is located beneath the Paw meter. If the needle is in the red when the test button is presed the battery charge is low.You should use an external power source. The blue area indicates medium to full battery charge. Each battery use time is different based on your conditions. The numbers on the Paw meter do not reflect the percent of charge.

NOTE: The battery charge level is best maintained by keeping the HT50 contin

uously plugged into an external power source.

Push to Unlock Button and Auto Lock Indicator

Auto Panel Lock can be enabled or disabled via User Set Up (see pg 3-29). When Auto Lock is set to “Enabled” in User Set Up and the ventilator is in On condition and 30 seconds have elapsed without pressing any buttons, the Auto Lock function is automatically activated and the (Auto Lock On) LED illuminates green. When Auto Lock is active, all touch buttons (except Silence/Reset and Int. Battery Test) are locked, preventing accidental changes.

SECTION 3

Silence / Reset

Press and hold the Push to Unlock button for at least one second to unlock the panel and enable the activation of all touch buttons for adjustment. An audible beep sounds and the LED is extinguished. When 30 seconds have elapsed without pressing any buttons, the Auto Lock is automatically activated again.

NOTE: Auto Panel Lock is factory preset to “Disabled” (off).

The Silence/Reset button has three functions:

1. Silencing alarms: Press the Silence/Reset button to silence all alarms for 60 seconds. When the Silence/Reset indicator is illuminated, all alarms are silenced except Device Alert alarm. Press the Silence/ Reset button again to cancel the silence period.

2. Clearing alarm messages: Press the Silence/Reset button to clear all alarm messages in the Message Display Window and to release latched LED indicators when the cause for the alarm is no longer present.

3. Toggle Buzzer Volume (alarm loudness) between Loud and Quiet: Press and hold the Silence/Reset button when there are no alarm messages displayed to toggle the alarm audible volume between loud and quiet. The alarm will sound at the new setting.

SERHT50NA A0808 3-13

Page 38

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

NOTE: The Battery Empty Alarm and the Device Alert Alarm can

not be silenced permanantly. These alarms indicate that an alternate source of ventilation must be utilized. See pgs 3-20 and 3-21 for more details.

Paw Meter (airway pressure meter)

Range: –10 to 100 cmH2O / 98 mbar

The Paw meter displays airway pressure. It also indicates the internal battery charge level when the Int. Battery button is pressed.

FRONT PANEL ALARMS

The front panel alarm LED indicators blink when an alarm limit setting is violated. Once the violation is no longer in effect, the indicators latch (remain steadily lit) until they are reset by pressing the Silence/Reset button.

High ▲ Paw and Low ▼ Paw Alarm Control and Display (airway pressure)

Range: Paw –10 to 100 cmH2O / 98 mbar

High ▲Paw Alarm 4 to 99 cmH Low ▼

The ▲Pa pressure alarm setting.

The ▼ pressure alarm setting.

To adjust either alarm, press the desired button once. The value in the adjacent display window will blink. Use the ▲Up/▼Down controls to adjust the display setting can be retained by (1) pressing the selected button again to accept the alarm setting, (2) selecting another parameter for adjustment, or (3) allowing five seconds to elapse without adjustment.

NOTE: In SPONT mode the ▼ value can be preset.

w button allows the selection of the high (peak) airway

Paw button allows the selection of the low peak airway

Paw Alarm 3 to 98 cmH2O / 96 mbar

O / 97 mbar

ed alarm setting value.The new

Paw alarm is inactive but the

3-14 SERHT50NA A0808

NOTE: The ▼ PEEP/CPAP + 3. The ▲Pa least 1 above the ▼

Paw alarm setting cannot be a value below

Paw alarm setting.

w alarm setting must be a value at

Page 39

▲ Paw (High Pressure) Alarm (user adjustable)

▼ Paw (Low Pressure) Alarm (user adjustable)

SECTION 3

Audible Alarm: Intermittent beep Visual Alarm: ▲Paw indicator blinks red Message Window: HIGH PRESSURE

The High ▲Paw Alarm is activated when airway pressure (Paw) reaches the ▲Paw alarm limit setting. Any breath in progress immediately cycles to e when Paw falls below the Paw alarm limit setting and at least one second has elapsed since the alarm was activated.

Audible Alarm: Intermittent beep Visual Alarm: ▼Paw indicator blinks red Message Window: LOW PRESSURE

xhalation. The alarm violation is cancelled

High ▲ V

•

and Low ▼ V

•

Alarm Control and Display

(inspiratory minute volume)

The Low ▼Paw Alarm is activated when airwa below the ▼

Paw alarm limit setting for two consecutive mandatory

y pressure remains

breaths. The alarm violation is cancelled when one mandatory breath is delivered without a ▼Pa

w alarm violation.

NOTE: The Low ▼Paw Alarm does not function in SPONT mode. The ▼Paw alarm limit does not apply to spontaneous breaths in SIMV mode.

Range: V

This window displays the inspiratory minute volume (in liters) and is automatically updated every 10 seconds. The V displays the delivered minute volume, except when the user is in the process of setting either the High or Low V

To adjust the High or Low V

•

High ▲ V Low ▼

•

Alarm 1.1 to 50.0 L/min

Alarm 0.1 to 49.0 L/min

•

alarm limit, press the ▲or ▼ V

0 to 99.0 L/min

•

alarm limit.

window always

•

button. The value in the adjacent display window will blink. Use the ▲Up/▼Down controls to adjust the displayed alarm limit

alue. The new limit can be retained by (1) pressing the selected

v button again to accept the alarm setting, (2) selecting another parameter for adjustment, or (3) allowing five seconds to elapse without adjustment.

SERHT50NA A0808 3-15

NOTE: The high inspiratory minute volume alarm limit is limited to 1 > the low alar

m limit setting. The low alarm limit is limited to 1

< the high alarm limit setting.

Page 40

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

•

▲ V

(High Insp. Minute Volume) Alarm

(user adjustable)

•

▼ V

(Low Insp. Minute Volume) Alarm

Back-up Ventilation (user adjustable)

Audible Alarm: Intermittent beep Visual Alarm: ▲V Message Window: HIGH V

The High Insp. Minute Volume Alarm is activated when the delivered inspiratory minute volume exceeds the High ▲ V setting. The alarm is cancelled after delivered inspiratory minute volume falls below the ▲V

•

indicator blinks red

•

alarm setting.

•

alarm

WARNING The Insp. Minute Volume Alarms are based on the

ered volume from the ventilator. The actual minute volume

deliv in the patient lungs may be significantly different in cases such as circuit leak, disconnection, and pneumothorax. To verify the exhaled minute volume, use a separate exhaled volume monitor.

Audible Alarm: Intermittent beep Visual Alarm: ▼V Message Window: LOW V

•

indicator blinks red

•

LOW V

i (BUV) (if back-up ventilation is active)

The Low Insp. Minute Volume Alarm is activated when delivered inspiratory minute volume falls below the Low ▼

•

alarm limit

setting.

WARNING The Insp. Minute Volume Alarms are based on the

ered volume from the ventilator. The actual minute volume

deliv in the patient lungs may be significantly different in cases such as circuit leak, disconnection, and pneumothorax. To verify the exhaled minute volume, use a separate exhaled volume monitor.

Back-up Ventilation

Back-up Ventilation is an alarmed function that activates when the delivered inspiratory minute volume (V setting. During Back-up Ventilation, the Low ▼V alarm indicator blinks, an audible alarm sounds, and “LOW V

•

) falls below the Low ▼V

•

(Back-up Vent)

•

i (BUV)” is displayed in the Message Display Window. The ventilation settings employed by Back-up Ventilation are then displayed on the front panel. Back-up Ventilation ceases when V

•

= ▼V

•

+ 10%, at which

time ventilation and front panel displays return to user-set values.

Back-up Ventilation is functional in all modes. See page 4-5 for a complete description of Back-up Ventilation.

3-16 SERHT50NA A0808

Page 41

High Baseline Pressure Alarm (automatic)

SECTION 3

Audible Alarm: Intermittent beep Visual Alarm: ▲Paw indicator blinks red Message Window: HIGH Pbase

Occlusion Alarm, Circuit (automatic)

Occlusion Alarm, Device (automatic)

The High Baseline Pressure (High P when airway pressure is above the Low ▼

base) alarm is activated

Paw alarm limit setting at the beginning of a time activated mandatory breath. The alarm resets when Paw drops to within 5 cmH

O / mbar of the set

PEEP/CPAP level.

Audible Alarm: Intermittent beep Visual Alarm: ▲Paw indicator blinks red at the high

iority rate

Message Window: OCCLUSION

An Occlusion alarm is activated when airwa the set PEEP + 15 cmH

O/mbar at 3 seconds after the beginning

y pressure is above

of expiration, or at the end of expiration, whichever comes first. When a breathing circuit occlusion occurs, the ventilator will be unable to release the pressure, therefore additional breaths will not be delivered until the condition is corrected. The alarm resets when airway pressure falls to within 15 cmH

O/mbar of baseline,

at which point breath delivery is resumed.

Audible Alarm: Intermittent beep Visual Alarm: ▲Pa

w indicator blinks red at the high priority

rate and Device Alert indicator blinks

Message Window: OCCLUSION

SERHT50NA A0808 3-17

An Occlusion alar the set PEEP + 15 cmH

m is activated when airway pressure is above

O/mbar at 3 seconds after the beginning

of expiration, or at the end of expiration, whichever comes first. When the Occlusion alarm is caused by a malfunction inside the ventilator, the HT50 will attempt to relieve circuit pressure through its redundant safety system. If successful, ventilation will continue, but in an alarmed state. It is possible that the condition causing the alarm will self-correct, in which case the alarm is reset. Otherwise, the ventilator will continue to alarm until the necessary service is performed. If the HT50 is unsuccessful in relieving circuit pressure, additional breaths will not be delivered unless airway pressure falls to within 15 cmH

O/mbar of baseline.

Page 42

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

WARNING Any time a Device Alert violation occurs along

with the message “OCCLUSION,” an alternate method of ventilation should be provided for the patient as soon as possible so that the cause of the violation can be adequately and safely investigated.

Low Baseline Pressure Alarm (automatic)

Audible Alarm: Intermittent beep Visual Alarm: ▼Paw/Apnea indicator blinks red Message Window: LOW Pbase

Check Prox Line Alarm (automatic)

The Lo unstable baseline (leak in the breathing circuit) or by a baseline decrease since the last PEEP/CPAP control change. A Low Pbase violation occurs in all modes when airway pressure remains > cmH blinks during Low ▼Paw violations blinks when this alarm is activated. The alarm resets when airway pressure is < 3 cmH

Audible Alarm: Intermittent beep Visual Alarm: ▼Paw/Apnea indicator blinks red Message Window: CHECK PROX LINE

The Chec the pressure measurement of the proximal pressure sensing line is significantly different from the internal back up pressure sensing line located inside the ventilator. This may be caused by a disconnected, kinked, water-filled proximal sensing line, or a blocked proximal line filter.Ventilation is continued during the alarm condition, using the pressure measurement of the internal sensing line.

w Baseline Pressure (Low Pbase) Alarm is activated by an

O/mbar below baseline for 3 seconds.The same LED that

O/mbar below baseline.

k Prox Line Alarm is activated when, during inspiration,

Apnea Alarm (automatic)

3-18 SERHT50NA A0808

Audible Alarm: Intermittent beep Visual Alarm: ▼Paw/Apnea indicator blinks red Message Window: APNEA

The Apnea Alar detected spontaneous efforts occur for 30 seconds. The alarm is reset by a time or patient trigger.

NOTE: The Apnea Alarm does not activate Back-up Ventilation.

m is activated when no mandatory breaths or

Page 43

PCV Not Reached Alarm (automatic)

SECTION 3

Audible Alarm: Intermittent beep Visual Alarm: ▼Paw/Apnea indicator blinks red Message Window: PCV NOT REACHED

Humidifier Alarm (automatic) HT50-H only

The PCV Not Reached Alar ventilation when the maximum inspiratory pressure (Paw P) is less than 50% of the target pressure for 2 consecutive mandatory breaths. The alarm is reset when maximum inspiratory pressure (Paw P) is >

Audible Alarm: Intermittent 3-pulse caution beep Visual Alarm: Humidifier indicator blinks yellow

The Humidifier Alar conditions occur in the HT50 built-in humidifier. When an alarm condition is detected the humidifier heater shuts down.

There are five humidifier alarms:

Messa

Check Humidifier Bottle removed or not clamped

50% of the target pressure.

m is activated when any of the following

ge Display Window Cause of Alarm

m is activated in pressure control

properly when trying to activate the humidifier.Temp Probe not connected or missing when trying to activate the humidifier.

Humidifier Fail Bottle removed while humidifier

is On. Failure of the primary humidifier control.

Check Temp Probe Temp Probe damaged or

missing while humidifier is On.

High Prox Temp Proximal temperature exceeds

set target temperature by 4°C when set at > set at < 34°C.

High Temp Core Excessive temperature in the

humidifier heating element.

NOTE: The Humidifier Alarm is automatically set when using the HT50 humidifier. Humidifier Alarms (and the built-in humidifier) do not function when the HT50 is po

wered on internal battery.

34°C or 6°C when

SERHT50NA A0808 3-19

Page 44

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

Battery Low Alarm (automatic)

Audible Alarm: Intermittent 3-pulse caution beeps Visual Alarm: Int. Battery indicator blinks yellow Message Window: Battery Low

Battery Empty Alarm (automatic)

Indicates that a minim remains in the dual internal battery. Pressing the Silence/Reset button will cancel the audible three-pluse caution beeps but the visual alarm will continue to blink and the alarm will beep once every three minutes as long as the alarm condition continues. The alarm is reset when A.C. or external D.C. power is connected to the HT50.

NOTE: The battery condition and ventilator settings will affect remaining time

Audible Alarm: Intermittent beep Visual Alarm: Int. Battery indicator blinks red Message Window: BATTERY EMPTY

Indicates that a minimum of 15 minutes of oper remains in the dual internal battery. An alternate power source must be located immediately. This alarm can only be temporarily silenced as long as the alarm condition continues. The alarm is reset when A.C. or external D.C. power is connected to the HT50.

, but it will be at least 30 minutes.

um of 30 minutes of operating power

ating power

NOTE: The battery condition and v remaining time, but it will be at least 15 minutes.

NOTE: Frequent deep discharge of the dual internal battery will decrease the amount of time the HT50 will oper power from a full charge state. Replace the battery when battery operation time is insufficient for application.

WARNING Immediately secure an external power source when the Battery Empty alarm is violated. Charge the batter minimum of 5 hours (~80% recharged) before powering the ventilator again from the internal battery. If the battery is completely depleted, it takes approximately 7 to 8 hours to fully recharge.

NOTE: If the HT50 is to be pow for an extended period, ensure that the dual internal battery is fully charged prior to use.

entilator settings will affect

ate on battery

y for a

ered from the dual internal battery

3-20 SERHT50NA A0808

Page 45

Fault, Battery System Alarm, Device Alert (automatic)

Audible Alarm: Intermittent beep Visual Alarm: Device Alert indicator blinks red Message Window: FAULT BAT SYS

SECTION 3

Power Switchover Alarm (automatic)

The status of the inter continuously monitored and any deficiency will result in a Battery Fault Alarm. The HT50 will continue to operate properly from an external power source but it can not be powered by the internal battery system.

NOTE: If the “Fault Bat Sys” device alert alarm occurs, keep the HT50 plugged into an e Medical Technical Service Dept.

Audible Alarm: Intermittent 3-pulse caution beeps Visual Alarm: Ext. Power indicator illuminates red

Messag

The Power Switchover Alarm is activated by switching from external power to the dual internal battery due to disconnection from the power cord or a power interruption. Pressing the Silence/Reset button will (1) cancel the audible alarm, (2) cancel the “No ext power” message, (3) cancel the Ext. Power LED and (4) cause the Int. Battery LED to change to non-blinking yellow indicator.

e Window: No ext power

nal battery system and the charging system is

xternal popwer source. Contact Newport

Battery indicator blinks yellow

Int.

Device Alert Alarm (automatic)

SERHT50NA A0808 3-21

If external power is connected within 60 seconds following internal battery operation, the HT50 will immediately switch back to external power. If internal battery operation has lasted longer than 60 seconds, there will be a delay of up to an additional 60 seconds before the HT50 will switch back to external power. If “No ext power” message is still displayed following the re-connection to external power, press Silence/Reset button to cancel the message.

Audible Alarm: Intermittent beep Visual Alarm: Device Aler Message Window: OCCLUSION or 10V SHUTDOWN or

T BAT SYS or SYSTEM ERROR or

FAUL MOTOR FAULT

t indicator blinks red

Page 46

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

The Device Alert Alarm is activated when the microprocessor detects a functional problem with the ventilator. With the exception of OCCLUSION & FAULT BAT SYS, all other Device Alert alarms are non-recoverable and will result in the HT50 discontinuing ventilation. When this occurs, the ventilator must be powered down by pressing the On/Standby button. DO NOT use the ventilator until the cause of the alert has been determined and corrected.

NOTE: See Pg. 3-17, Occlusion Alarm, Device, and Pg. 3-21,

ault Battery System Alarm, for a detailed description of these

F recoverable Device Alert Alarms.

There are three possible messages that will be displayed when a non-recoverable Device Alert Alarm occurs; (1) MOTOR FAULT (2) 10V SHUTDOWN and (3) SYSTEM ERROR. For MOTOR FAULT and10V SHUTDOWN the full text message will be displayed for 5 seconds, followed by an abbreviated form of the message, eg. MTR Fail, or 10V Fail. A timing message will also appear, documenting how long the condition has been present. The format for the time is “H:MM:SS.” The SYSTEM ERROR message will always be displayed with full text.

Shut Down Alert Alarm (automatic)

NOTE: If the cause of the SYSTEM ERROR does not allow the

HT50 to displa to light, the ventilator will shut down and the Shut Down Alert Alarm will activate. Upon the next power up of the unit, the SYSTEM ERROR message will be displayed. If the cause of the alarm has been corrected, the message can be cancelled by pressing the Silence/Reset button.

WARNING If a non-recoverable Device Alert alarm occurs, immediately disconnect the patient from the ventilator and provide an alternate method of v

NOTE: A non-recov without first turning the ventilator Off (Standby).

Audible Alarm: Intermittent beeps Visual Alarm: – Message Window: –

The Shut Do Off. An intermittent audible alert indicates the ventilator is no longer operating. The intermittent beeps will continue for at least 10 minutes or until it is silenced by pressing the Silence/Reset button.

y the alarm message and the Device Alert indicator

entilation.

erable Device Alert Alarm cannot be silenced

wn Alert Alarm occurs when the ventilator is powered

3-22 SERHT50NA A0808

Page 47

FRONT PANEL MESSAGE DISPLAY WINDOW

Message Display Window

All messages and alarms are displayed in a 16 character, alpha numeric window located above the MODE controls.

Monitoring Messages:

When the Message Display Window is blank (no message

yed) press the ▲Up control button to scroll through the

displa monitor volume, frequency, pressure values and operation information. Tidal volume, peak pressure, and baseline pressure are updated breath by breath. Frequency and mean pressure are also updated breath by breath, using a 6 sec. rolling average for frequency and a 60 sec. rolling average for mean pressure. Minute volume is updated every 10 seconds using a 60 sec. rolling average.

NOTE: Monitoring Messages cannot be accessed during alarm violations.

ing messages available. Monitored information includes

SECTION 3

There are 3 selections a

•

• VT / V

i / f

vailable:

• Paw / P / M / B

• H/S/L (or Q) Press the ▲ Up button to scroll through the lines.Three seconds after selecting a line

, the relevant operating parameters are displayed.

Following are the parameters for each line:

•

Line 1: “VT xxx V

VT – Tidal volume (in mL)

•

i – Insp. Minute Volume (in L/min) rounded to nearest

i xx f xx”

whole number

ƒ – Total number of patient or time activated breaths

detected for the last 60 seconds (in b/min)

Line 2: “Paw Pxx Mxx Bxx”

P – Peak airway pressure of last breath M – Mean airway pressure B – Baseline airway pressure at the end of expiration

SERHT50NA A0808 3-23

Line 3: “H xxxxx Sxxxxx L (or Q)”

H – Hour meter reading S – Software Version L/Q– Audible Level of Alarm (Loud or Quiet)

After 4 seconds this line will go blank. Access this information any time by pressing the ▲ Up button.

Page 48

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

Alarm and Caution Messages:

All alarms have corresponding messages in the Message Display Windo violated, they are displayed in order of medical priority. Alarm messages override the display of monitored parameters.

Setting Limitation Messages:

The following “Setting Limitation” messages are displayed to notify the user that adjustments ha software defined limitations. Reached Max V Reached Min V Inverse I:E: inverse I:E ratio has been reached Reached Max I:E: inverse I:E ratio has reached 3:1 V Peep + PS Too High: set PEEP + Psupport is higher than 60 PC – Peep Too Low: Pressure Control value minus PEEP is less

q – PEEP Too Low: High Pressure alarm limit minus PEEP is

w. See pg 2-3 for list of alarms. If more than one alarm is

ve caused parameters to reach

•

: maximum V• (flow) setting has been reached

•

: minimum V• (flow) setting has been reached

•

Unavailable: V• display is not available in Pressure Control

than 5 cmH

less than 5 cmH

O/mbar

LEFT SIDE CONNECTORS

Airway Pressure Connector

The following messages are provided as “prompts” or reminders.

Panel Locked: notifies user that the front panel buttons are

now locked

PRESS AGAIN: notifies user that a second press on the

same button is required in order to confirm change requested

WARNING The round heater for the optional humidifier is located near the left side connectors. This heater becomes extremely hot when the humidifier is on. DO NOT TOUCH!

Measures airway pressure. Connect the proximal pressure sensing line of the patient breathing circuit to this fitting.

WARNING Always use an inline filter (p/n HT6004701 or

alent) at the Airway Pressure Connector to protect the

equiv internal pressure transducers from moisture or other contaminants.

Gas Output Connector

3-24 SERHT50NA A0808

Supplies gas flow to the patient. Connect the patient breathing circuit to this outlet.

Page 49

Exhalation Valve Connector

Temperature Probe Connector

(HT50-H model)

RS-232C Connector

SECTION 3

Controls the exhalation valve. Connect the exhalation valve control drive line to this outlet.

Electrical connector for dual-channel temperature probes which are used to measure the temperature in the humidifier water bottle and the patient breathing circuit.

An 8 pin SEMCONN connector operating at 19,200 baud which allows the ventilator system to interface with central alarm systems and remote alarms.

NOTE: Contact your N information regarding compatibility with specific remote monitoring systems.

Emergency Air Intake

Allows the patient to pull ambient air into the breathing circuit in the event of a complete system failure. Air intake opening pressure is approximately –3 cmH

RIGHT SIDE CONNECTORS

Fresh Gas Intake And Filter Cover

EWPORT representative for more

O (–3 mbar).

WARNING Do not obstruct the Emergency Air Intake! Any impediment could result in patient suff

WARNING HOME CAREGIVERS: Should a complete failure of the ventilator occur patient to breath from room air through the intake valve. Blockage of the valve could result in suffocation. Check periodically to ensure that the valve functions correctly.

, the Emergency Air Intake allows the

ocation.

SERHT50NA A0808 3-25

Environmental air enters through this 30 mm ID Fresh Gas Intake. The air inlet particle filter is placed behind the Filter Cover to protect the patient as well as the ventilator’s piston system from dirt and particles. The Fresh Gas Intake is the attachment socket for the optional HT50 Air/Oxygen Entrainment Mixer or an Oxygen Blending Bag.

WARNING Do not block the Fresh Gas Intake.

Page 50

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

External Power Connector

100-240 VAC, max. 2A 12-30 VDC, max. 12A 50/60/400 Hz

The HT50 uses a single inlet for both A.C. and D.C. power sources.

D.C. connections

A.C. connections

Equipotential Connector

The inlet power connector automatically recognizes A.C. voltage ranges from 100 to 240 and D.C. ranges from 12 to 30. A Newport approved external battery can be attached to this connector.

WARNING To ensure proper grounding and prevent possible

k hazards, this device should only be connected to

shoc “Hospital Grade” power receptacles.

WARNING HOME CAREGIVERS: External power in the home en

vironment must support min. 100 to max. 240 VAC

and must have a grounded receptacle.

Used for electric potential equalization.

Power Cord Ferrite

OPTIONAL ACCESSORIES

Air/Oxygen Entrainment Mixer

Use of the Power Cord Ferrite ensures that the HT50 meets EMC requirements. Anytime the HT50 is operating on A.C. power, the ferrite should be attached to the power cord. Operating from D.C. power does not require the use of the ferrite.

NOTE: Alwa

ys use the A.C. power cord supplied with the HT50.

The Air/Oxygen Entrainment Mixer (p/n HT460700) is used to blend atmospheric air with medical grade oxygen at a precise ratio. A control knob allows for incremental adjustment from 0.21 to 1.00 F

. The high pressure oxygen hose has a standard

IO2

female DISS 1240 connection. The Mixer attaches into the Fresh Gas Intake of the HT50 on the Filter Cover, located on the right side of the ventilator.

3-26 SERHT50NA A0808

Pneumatic Requirements Oxygen 35-90 psig (2.4 to 6.2 Bar)

Page 51

Oxygen Blending Bag Kit

Auto Lighter Cable

SECTION 3

The Oxygen Blending Bag Kit (p/n HT600044) is used to blend atmospheric air with a low flow (0 to 10 L/min) medical grade oxygen source. The Oxygen Blending Bag Kit attaches into the Fresh Gas Intake on the Filter Cover, located on the right side of the ventilator. This system allows the user to ventilate patients with oxygen enriched gas from 0.21 up to 1.00 F

Pneumatic Requirements Oxygen 0-10 L/min

The Auto Lighter Cable (p/n HT460085) allows the HT50 to be powered through the D.C. lighter plug in an automobile. The internal battery charges whenever the HT50 is connected to an external power source, equal to or greater than 12 VDC, including the D.C. lighter plug.

IO2

USER SET UP

The User Set Up allows the operator to select a variety of functional parameters. User Set Up parameters must be established before the HT50 is used for ventilation.

NOTE: HOME CAREGIVERS: The User Set Up parameters should be defined in conjunction with y Dealer. Once established, these parameters are kept in memory and will be in affect each time the ventilator is powered on until the operator enters User Set Up and makes changes.

NOTE: To enter User Set Up the HT50 must be in the Standby condition.

o access User Set Up, when connected to A.C. power, press and

T hold the Silence/Reset button down. When operating on internal battery, you must press the On/Standby button while pressing and holding the Silence/Reset button. When the Message Display Window briefly displays the message “USER SETUP”, release the button. The Message Display Window will next display the first parameter. See Table 3-1.

The user may scroll through the rest of the set up parameters by pressing the Int. Battery button. Use the ▲Up/▼Down control b

uttons to change the parameter setting. To exit User Set Up, press

the Silence/Reset button once. The HT50 is now ready for use.

our physician or Homecare

SERHT50NA A0808 3-27

Page 52

DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS

Parameter Display ▲ Up/ ▼ Down

(allows selection)

Headline USER SETUP None Power Save Power Save ON* Toggles On/Off Pressure Units Pressure cmH2O* Toggles cmH2O/mbar

* Factory default setting. May be

different if another setting was selected during the previous User Set Up.

Set up Set up USER* Toggles User/Default Auto Panel Lock Lock DISABLED* Toggles

Enabled/Disabled

Technical Set Up Tech. Setup Refer to Service

Manual Section 5

Table 3-1: User Set Up Parameters

NOTE: Only the ▲Up/▼Down, Silence/Reset, and Int. Battery

uttons are active during User Set Up.

User Set Up Parameter

Power Save

Use the ▲Up/▼Down controls to toggle the Power Save function On

. To conserve battery power consumption during internal

or Off battery operation, the Power Save function automatically blanks the HT50’s numeric displays if the ventilator has operated for 2 minutes with no buttons pressed or alarms violated. MODE, On/Standby, Int. Battery indicators and message display window remain active at all times.

If an alarm condition occurs, or any button is pressed, the Power Save function is suspended for 2 minutes. The Power Save feature can extend battery operating time by as much as 30%.

Pressure Units

Selects between cmH

O and mbar as the unit used on the

pressure meter and the various front panel controls. The HT50 is factory set to cmH

O. Use the ▲Up/▼Down controls to toggle

to the mbar setting.

NOTE: For consistency, particularly in medical record keeping, it is recommended that each institution standardiz “cmH

O” or “mbar” operation.

e to either

3-28 SERHT50NA A0808

NOTE: HOME CAREGIVERS: The unit of measure, along with other par

ameter settings, should be established by the patient’s

physician or Homecare Dealer.

Page 53

SECTION 3

Set Up

The Set Up parameter allows the operator to set the ventilator’s star

t up settings. There are two selections, DEFAULT or USER.

Use the ▲Up/▼Down button to toggle between selections.

When USER is selected, all of the v

entilation parameters in effect at shutdown will be saved.The saved parameters will appear next time the ventilator is powered on.

When DEFAULT is selected, factory set default parameters will appear next time the ventilator is powered on. Default parameters are listed on pg 2-7.

NOTE: HOME CAREGIVERS: This parameter should always be set to USER f

or home use to ensure that when the HT50 is powered off

and on the physician directed ventilation settings remain in place.

Auto Panel Lock

This setting allows the user to enable (turn on) or disable (tur

n off) the Auto Panel Lock feature. For a complete description of Auto Panel Lock see pg 3-13. The Auto Panel Lock feature is factory set at Disabled or off. Use the sUp/tDown buttons to toggle between Enabled and Disabled.

NOTE: HOME CAREGIVERS: Newport recommends that the Auto Panel Lock feature be enabled in homecare environments as an added safety f

eature to prevent accidental changes to panel controls.

Exiting User Set Up

SERHT50NA A0808 3-29

Exit by pressing the Silence/Reset button at any time.

Page 54

4. THEORY OF OPERATION

General System Overview . . . . . . . . . . . . . . . . . . . 4-1

A/CMV Mode (Assist/Control

Mandatory Ventilation). . . . . . . . . . . . . . . . . . . . 4-2

SIMV Mode (Synchronized Intermittent

Mandatory Ventilation). . . . . . . . . . . . . . . . . . . . 4-3

SPONT Mode (Spontaneous Ventilation) . . . . . . . 4-3

Psupport (Pressure Support) . . . . . . . . . . . . . . . . 4-4

Pressure Control (Pressure Control Ventilation) . . 4-4

Volume Control (Volume Control Ventilation). . . . . 4-5

Back-Up Ventilation . . . . . . . . . . . . . . . . . . . . . . . . 4-5

SERHT50NA A0808

Page 55

GENERAL SYSTEM OVERVIEW

The Newport HT50 Ventilator is a compact, lightweight, powerconservative, ventilator that is designed to provide ventilation for adult and pediatric (infants, children & adolescents) patients with body weight >

The HT50 Ventilator’s unique, patented dual-micro-piston gas compressing technology allows the HT50 to operate without an external compressed gas source, making it convenient to use in a variety of environments such as hospitals, emergency response, subacute facilities, homes and transport operations. The dual micro pistons’ ability to deliver a variable flow enables the HT50 to provide a full range of operating modes and breath types, including Assist Control, SIMV and SPONT modes with Volume Control and Pressure Control mandatory breaths, Pressure Support of spontaneous breathing and servo-controlled leak-compensated PEEP. Leak compensation helps to improve triggering and avoid auto-triggering when a leak is present. The HT50 may be used with an endotracheal tube, tracheal tube, mask or mouthpiece.

SECTION 4

10 kg.

The HT50 provides monitoring of inspiratory tidal volume (every breath), inspiratory minute volume, total respiratory rate, peak pressure, mean pressure and baseline (PEEP) pressure. Realtime patient circuit pressure is displayed at all times on the airway pressure gauge on the face panel.

The user sets variable alarm settings for High Pressure, Low Pressure, High Inspiratory Minute Volume and Low Inspiratory Minute Volume, with Back Up Ventilation provided in all modes in response to a Low Minute Volume Alarm. There are also built in alarms for High Baseline, Low Baseline, (Circuit) Occlusion, Apnea, PCV Not Reached, Check Prox Line, Power Switchover (from external to internal), Low Battery and Empty Battery and Device Alerts. The HT50-H model also provides humidifier related alarms.

Gas delivery to the patient may be enriched with oxygen (0.21-

1.00) using either the Air Oxygen Entrainment (50 psi) Mixer (HT460700) or the Low Flow Oxygen Blending Bag Kit (HT600044).

There is an Auto-Lock feature that may be enabled or disabled. The alarm loudness may be set to two different levels.

SERHT50NA A0808 4-1

The HT50 may be operated from a variety of AC (100-240 VAC @ 50 / 60 / 400 Hz) or DC (12-30 VDC) external power sources or from the Dual Pac Internal Battery System. The Autolighter Cable (HT460085) accessory enables connection to an automobile-type DC outlet.

Page 56

THEORY OF OPERATION

Any time external power is connected to the ventilator, the Dual Pac Internal Battery system is charging. And when external power is lost, the (new and fully charged) Dual Pac Internal Battery system takes over and powers the HT50 for up to 10 hours, at standard ventilator settings. A Battery Low Alarm alerts the user when a minimum of 30 minutes operating time remains.

The HT50 is available with a built-in humidifier or without.

The HT50 is very easy to set up and use with clear indications of all ventilation and alarm settings and alarm violations.

NOTE: When the HT50 is used in a home care environment it is important that the pr demonstrated competency in all equipment functions. A specific written care plan must be established by the attending physician.

NOTE: Transport of patients with the HT50 requires that medical staff ha problem resolution. Proper emergency back-up equipment must be immediately available during transport.

ve a good working knowledge of the ventilator’s use and

imary caregiver has received training and has

A/CMV MODE (Assist/Control Mandatory Ventilation)

In A/CMV mode, time activated (mandatory) breaths are delivered in accordance with the breaths in addition to, or in place of, time activated (mandatory) breaths if the effort they generate causes airway pressure to meet the Ptrig setting. Every such patient effort results in a mandatory breath. The breath can be volume or pressure controlled. PEEP/CPAP may be added. Tidal volume is determined by the target pressure, tI, and patient respiratory mechanics in Pressure Control and by the tidal volume setting in Volume Control.

As with all HT50 operating modes, Back-up Ventilation is activated if the Low ▼V

ƒ setting. Patients can trigger mandatory

•

alarm limit is violated.

4-2 SERHT50NA A0808

Page 57

Figure 4-1

TIME TRIGGERED

MANDATORY BREATH

PATIENT TRIGGERED

MANDATORY BREATH

SPONTANEOUS BREATH

PRESSURE

100%

MANDATORY BREATH

INTERVAL

MANDATORY BREATH

INTERVAL

MANDATORY

BREATH LOCKOUT INTERVAL

A: Time Triggered Mandatory Breath B: Patient Triggered Mandatory Breath C: Spontaneous Breath

---: "Scheduled" Mandatory Breath not delivered because of the patient triggered mandatory breath in the last interval

Synchronized Intermittent Mandatory Ventilation (SIMV)

SECTION 4

SIMV MODE (Synchronized Intermittent Mandatory Ventilation)

In SIMV mode, patients receive a fixed number of volume or pressure controlled mandatory breaths (time or patient activated) and may breathe spontaneously between mandatory breaths, with or without pressure support (Psupport). See Figure 4-1 for schematic illustration. PEEP/CPAP may be added.

The first patient triggered breath in any mandatory breath interval will be a patient triggered mandatory breath. The patient has the rest of the interval to breathe spontaneously. If the patient does not trigger the ventilator, and one complete mandatory breath interval has elapsed, a time triggered mandatory breath is delivered.

A mandatory breath lockout interval is activated whenever the patient triggers a mandatory breath. This limits the number of mandatory breaths (time triggered or patient triggered) the patient receives in 60 seconds to the

As with all HT50 operating modes, Back-up Ventilation is activated if the Low ▼V

•

alarm limit is violated.

ƒ (b/min) setting.

SPONT MODE

(Spontaneous Ventilation)

SERHT50NA A0808 4-3

In SPONT mode, mandatory breaths are not delivered but the user can adjust both PEEP/CPAP and pressure support (Psupport) levels. The patient has control over each breath.

Page 58

THEORY OF OPERATION

When PEEP/CPAP is set above 0, the ventilator mode is CPAP (without Psupport) or Bi-level Positive Airway Pressure (with Psupport). Ensure that Ptrig is set so the HT50 detects all spontaneous patient efforts.

ƒ, t

Entries for tidal volume, pressure control, limit are all inactive in SPONT mode. However, users can preset these parameters for future A/CMV or SIMV operation.

and Low Paw alarm

As with all HT50 operating modes, Back-up Ventilation is activated if the Low ▼V

PSUPPORT (Pressure Support)

Psupport only functions during patient triggered spontaneous breaths in SIMV and SPONT modes. During each spontaneous breath, the ventilator supports the patient by elevating the airway pressure to the Psupport + PEEP level. Breaths are terminated when (1) flow to the patient drops to 25% of that breath’s peak flow rate, or (2) the target airway pressure is exceeded by 3 cmH (mbar), or (3) after 3 seconds of inspiration.

PRESSURE CONTROL (Pressure Control Ventilation)

The HT50 targets and maintains patient airway pressure at the set pressure control level throughout inspiration. Breath termination occurs when (1) the set tIelapses, or (2) Paw exceeds the Pressure Control setting by 8 cmH

•

alarm limit is violated.

O (mbar).

4-4 SERHT50NA A0808

NOTE: The target airwa mandatory breaths in A/CMV and SIMV is the display setting above ambient pressure, not above PEEP.

Both time and patient triggered mandatory breaths can be delivered in A/CMV and SIMV Pressure Control operation. During SIMV Pressure Control operation, patients can breathe spontaneously between mandatory breaths with or without pressure support.

NOTE: When disconnecting the patient circuit during PCV/PSV ventilation, i.e compensate for the low pressure. After reconnecting the patient circuit, the flow will automatically readjust to meet the patient’s demand.

. for suctioning, the flow may increase in order to

y pressure for pressure controlled

Page 59

VOLUME CONTROL (Volume Control Ventilation)

BACK-UP VENTILATION

SECTION 4

During Volume Control ventilation, tidal volume can be set for mandatory breaths. If a volume setting is changed while the ventilator is operating, the change takes place in increments over a series of breaths.

When tidal volume is adjusted, inspiratory time remains constant

•

(mandatory flow) changes.

and V

If an attempted tidal volume setting results in a flow rate in excess of 100 L/min or less than 6 L/min, adjustment ceases and the user is alerted by an audible beep and the message “Reached

•

Max V Window.

NOTE: Make sure that the mandatory flow (V to meet patient flow demands. The flow setting is displayed by pressing the front panel button labeled V changed by adjusting tI.

” or “Reached Min V•” will appear in the Message Display

•

) setting is adequate

•

. Mandatory flow is

Back-up Ventilation is an alarmed function that activates when the delivered inspiratory minute volume (V alarm limit setting. During Back-up Ventilation, the Low ▼V up Vent) alarm indicator blinks, an audible alarm sounds, and

•

“Low V

i (BUV)” is displayed in the Message Display Window. The

•

) falls below the Low ▼ V

•

(Back-

ventilation settings employed by Back-up Ventilation are displayed on the front panel.

Back-up Ventilation is functional in all modes.

NOTE: Back-up Ventilation is not active for 60 seconds after the user adjusts any ventilator controls, changes modes or turns the

entilator On from the Setting condition.

NOTE: During Back-up Ventilation, the Silence/Reset button can be pressed to silence the audib

le alarm. This will not cancel Back-

up Ventilation.

NOTE: Back-up Ventilation in the HT50 is based on the delivered

atory minute volume. The inspiratory minute volume may be

inspir different from the expiratory minute volume in some conditions, such as in the case of a patient breathing circuit or patient airway leak.

SERHT50NA A0808 4-5

Page 60

THEORY OF OPERATION

Back-up Ventilation in A/CMV and SIMV Modes:

(Back-up Ventilation parameters are indicated on the front panel displays.)

In A/CMV or SIMV modes, mandatory breath frequency increases by 1.5 times the frequency (

ƒ) setting, up to a maximum of 99

b/min. The minimum breath frequency delivered is 15 b/min.

The frequency (

ƒ) will only increase up to a rate that produces a 1:1

I:E ratio even if the calculated Back-up Ventilation rate is higher.

Back-up Ventilation in SPONT Mode:

(Back-up Ventilation parameters are indicated on the front panel displays.)

In SPONT mode, the MODE changes from SPONT to SIMV, Pressure Controlled ventilation, mandatory breath frequency ( 15 b/min., peak inspiratory pressure = 15 cmH

O/mbar above set

ƒ)=

PEEP and inspiratory time (tI) = 1.0 sec.

Cancellation of Back-up Ventilation

User Cancelled

If during Back-up Ventilation, the user adjusts any ventilation

ameter, Back-up Ventilation is suspended for one minute and

par all user selected ventilation parameters are employed. Another 60 seconds must pass after parameter adjustments before a ▼

•

alarm violation will result in Back-up Ventilation.

Patient Cancelled

•

If delivered inspiratory minute volume exceeds the Low ▼ setting by 10%, Back-up Ventilation is cancelled, the audible alarm stops, the Low ▼V

•

(Back-up Vent) alarm indicator latches

alarm

and the HT50 resumes ventilation at the user-selected parameters.

Press the Silence/Reset button to cancel the latched alarm indicator and alarm message in the Message Display Window.

4-6 SERHT50NA A0808

Page 61

5. CALIBRATION AND OPERATIONAL VERIFICATION PROCEDURE (OVP)

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Test Equipment Required. . . . . . . . . . . . . . . . . . . . 5-1

Pre-Test Inspection. . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Front Panel Test / Alarm Check . . . . . . . . . . . . . . . 5-3

System Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Pressure Transducer Calibration . . . . . . . . . . . . . . 5-4

Pressure Meter Calibration . . . . . . . . . . . . . . . . . . 5-5

Volume Factor Calibration . . . . . . . . . . . . . . . . . . . 5-5

Pressure Relief Valve Calibration. . . . . . . . . . . . . . 5-6

Exhalation Valve Calibration. . . . . . . . . . . . . . . . . . 5-6

Operational Set-Up (Standard Test Settings) . . . . 5-7

Pressure Verification. . . . . . . . . . . . . . . . . . . . . . . . 5-8

P trig . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

PEEP / CPAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Exhalation Valve Sealing . . . . . . . . . . . . . . . . . . . . 5-9

Manual Inflation . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

High Paw Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Low Paw Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Check Prox Line Alarm . . . . . . . . . . . . . . . . . . . . 5-10

Battery Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Humidifier (for HT50-H) . . . . . . . . . . . . . . . . . . . . 5-11

OVP Test Record . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

SERHT50NA A0808

Page 62

INTRODUCTION

This procedure is intended to assist a Newport authorized service technician to establish a routine verification program to verify proper operation of the HT50 Ventilator (p/n HT50-H1, HT50-H1-B, HT50-H). An OVP must be performed each time the ventilator is serviced or a minimum of once a year.

TEST EQUIPMENT REQUIRED

20 cc syringe with Luer lock HT50 adult reusable breathing circuit with exhalation valve 500 cc Test Lung (LNG500A with restrictor or LNG800P) that will

function at 90 cmH Parabolic resistor Rp50 (p/n RP50)

SECTION 5

WARNING Do not use the ventilator if it does not pass the

ational Verification Procedure.

Oper

O/mbar or equivalent

Cap (CAP100P) Calibrated manometer or pressure gauge

(range: 0 to 100 cmH T-connector (p/n TOL200A) Humidifier bottle and probe (for HT50-H with humidifier) Vacuum gauge (0-120 mmHg minimum) Stop watch or equivalent

Caution The accuracy of any test equipment should be ann

ually certified by a testing laboratory before use. Take

calibration data into account.

NOTE: Make a copy of the Test Record at the end of this section and check off each test as it is perf version number and hours on the test record.

NOTE: Audible alarms will activate periodically while performing some tests Silence/Reset button.

. You may silence the alarm by pushing the

O/mbar)

ormed. Enter the software

SERHT50NA A0808 5-1

NOTE: After every setup parameter change, wait a few breaths to

w the ventilator to stabilize before recording values.

allo

Page 63

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

PRE-TEST INSPECTION

Refer to Figure 9-1.

1. General Inspection

• Inspect the patient breathing circuit, exhalation valve, and 500 cc test lung for any deterioration which may cause leaks in the system. Replace any defective parts prior to performing the OVP.

• Inspect the A.C. power cord for any deterioration. Replace the power cord as necessary.

• Inspect the proximal filter. If filter housing indicates the presence of dirt or moisture, replacement of the filter is necessary.

WARNING DO NOT reverse filters. This practice will allow contaminates to enter the breathing circuit or ventilator contaminated filters must always be replaced with new filters.

2. Air Inlet Filter

• Remove the Air Inlet Filter Cover (8).

• Inspect the inlet filter (11). If the filter material indicates the presence of dirt or is discolored, replacement of the filter is necessary.

• Before reinstalling the Inlet Filter Cover, make certain that the filter is lying flat within the counterbore of the cover.

• Reinstall the Cover, making certain that the filter material remains securely in place. Verify that the O-ring (9) is in its proper place.

. Dirty or

3. Connecting Breathing Circuit, Exhalation Valve, and Test Lung

• Connect one end of the patient tubing to the main flow outlet labeled “GAS OUTPUT” (bypassing any humidifier) and the other end to the exhalation valve. Connect one end of the exhalation drive line tubing to the connector labeled “EXH. VALVE” and the other end to the white connector on the exhalation valve. Connect one end of the proximal pressure tubing to the connector labeled “AIRWAY PRESSURE” (via the proximal inline filter) and the other end to the blue connector on the exhalation valve.

• Connect the 500 cc test lung to the exhalation valve.

NOTE: The proximal filter must remain inline for all calibrations and tests.

5-2 SERHT50NA A0808

Page 64

FRONT PANEL TEST/ALARM CHECK

1. Connect the ventilator to A.C. power.

2. Press the On/Standby button once. The ventilator performs a self-test and then switches to the Settings condition. During the self-test, verify operation of the audible alarm and all LED indicators, numeric and alphanumeric displays.Verify that:

• All single color and dual color indicator LEDs are functional

and are at the same intensity.

• All 7-segment LEDs are functional.

3. Press all buttons and verify that all buttons are functional and can be operated with the same force.

SECTION 5

SYSTEM LEAK TEST

NOTE: Before contin

has been in Settings or On mode for at least 5 minutes.

4. Disconnect the ventilator from A.C. power.

5. Place the ventilator in the Standby condition by pressing the On/Standby button twice.

6. Let the shutdown alarm continue for at leaset two minutes before silencing it with the alarm Silence/Reset button.

7. If the alarm does not continue strongly for at least two minutes, contact Newport technical support.

8. Connect the ventilator to A.C. power.

1. Set the HT50 to Standard Test Settings.

2. Check the 3 thumbscrews of the inlet filter cover in order to ensure no leakage around the cover.

uing to the next step, verify that the ventilator

SERHT50NA A0808 5-3

3. Connect the vacuum (negative pressure) gauge to the gas inlet.

4. Start ventilation. The required pressure reading must be 120 mmHg or greater. A failed test is characterized by either (1) failing to achieve 120 mmHg negative pressure, or (2) a rapid drop in the vacuum during exhalation.

NOTE: During exhalation phase, a decrease in negative pressure on the negativ

e pressure gauge is normal.

Page 65

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

NOTE: If system leak test fails and the leak exists in the pneumatic

system between the manifold and patient circuit, calibration shall be performed again after the leak is fixed.

PRESSURE TRANSDUCERS CALIBRATION

1. Connect the T-connector between the patient fitting on the exhalation valve and a test lung. Connect the small bore tubing from the T-connector to the calibrated pressure gauge.

2. While in the Standby condition, enter USER SETUP by pressing and holding the Silence/Reset button until the Message Display Window shows “USER SETUP,” then release the button.

3. Use the Int. Battery button to scroll to the “Tech. Setup” message. Use the ▲Up control button to select this parameter. When the Message Displa press the ƒ button then the A/CMV button within 5 seconds.

y Window displays “Enter Code…,”

4. The Message Display Window will display “Pressure Cal.”

5. Press the ▲Up control button and the Message Display

w will display “Apply Zero Pressure.” Make sure that the

Windo calibrated pressure gauge shows zero pressure. If pressure > 0, remove breathing circuit to relieve pressure.

6. Press the Int. Battery button. The system will start the motor and will inflate the test lung. The Message Display Window will show “Pressure = 60.0” (60 is the default value). Adjust the displayed value in the Message Display Window on the ventilator using the ▲Up/▼Down control buttons so that it

ws the same value as the calibrated pressure gauge.The

sho value should be between 40 and 90.

7. Press the Int. Battery button again. After a couple of seconds you will see two pressure values displayed: P1 = X and P2 = X (X is the pressure value). After a few seconds the Message Display Window will show the message “Pressure Cal.” You are now ready to repeat the calibration.

8. Repeat steps 5 through 7, this time making note of the P1 and P2 values. These two numerical values should be within 1.5 of each other. If the difference is within an acceptable range, you are ready for the next calibration. If they are not, repeat calibration until the values are within this range.

5-4 SERHT50NA A0808

9. Remove the T-connector and 500 cc test lung.

Page 66

PRESSURE METER CALIBRATION

1. Use the Int. Battery button to scroll to “Meter Cal.”

2. Press the ▲Up control button to select “Meter Cal.” The Message Displa

3. Use the ▲Up/▼Down control buttons to adjust the Paw needle to 0.

Press the Int. Battery button and the Message Display Window

4. will display “Adjust to 60.”

5. Use the ▲Up/▼Down control buttons to adjust the Paw needle to 60.

Press the Int. Battery button and the Message Display Window

6. will display “Verification” and will then cycle the Paw meter needle to 0, 30, 60 and 90. The needle should be within 4 at each setting. If it is not, complete step 7 then repeat steps 1-6.

SECTION 5

y Window will display “Adjust to 0.”

7. Press the Int. Battery button to exit “Verification.” The routine will exit after reaching 90, and the display will return to “Meter Cal.”

VOLUME FACTOR CALIBRATION

1. Use the Int. Battery button to scroll to “Set Vol Factor.”

2. Press the ▲Up control button. The Message Display Window will displa

3. Connect an Rp50 parabolic resistor to the patient end of the exhalation valve and leave the other side of the resistor open to air. MAKE SURE IT IS NOT BLOCKED IN ANY WAY.

4. Press the Int. Battery button and the system will star After the motor stops the Message Display Window will display “Vol Factor=XXX.” Valid numbers are between 80-120. Record the value on the test sheet.

5. Press the Int. Battery button. Press the ▲Up control button.

Repeat step 4. If the Volume Factor is not within ± 5 of the

6. previous value and within the range of 80-120, repeat steps 2-6 until two consecutive calibration procedures produce Vol Factor +

y “Connect Rp50.”

t the motor.

5 of each other and both are between 80 and 120.

SERHT50 C1104 5-5

7. Press the Int. Battery button to exit the Volume Factor Calibration.

Page 67

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

PRESSURE RELIEF VALVE CALIBRATION

1. Use the Int. Battery button to scroll to “Adjust Rel Valve.”

2. Block the Mainflow outlet using CAP100P, and press the ▲Up control b system will begin to rise.

3. Verify there is no air leaking from the exhalation valve. All air leakage must be from the pressure relief valve.

If no leakage is noted, proceed to step 4. If leakage is noted, you will need to pressurize the exhalation valve from an external source. While the motor continues to run, perform the following:

• Disconnect the exhalation valve tubing from the EXH.VALVE

• Connect this same tubing to the Luer connector on the 20 cc

• Pressurize the exhalation valve diaphragm by pushing on the

utton. This will start the motor and pressure in the

connector on the ventilator.

syringe.

syringe plunger until the leakage from the exhalation valve ceases.

4. The Message Display will indicate the circuit pressure. Verify that the displayed pressure is 110 ±10.

5. If the pressure is outside this limit, use a Phillips screwdriver to adjust the pressure by turning the pressure relief screw located on the underside of the Mainflow Outlet Assembly.

6. After verifying that the Message Display Window is showing 110 ±10, unblock the outlet of the Rp50, and press the Int. Battery button.

NOTE: If the 20 cc syringe was used, remove it now and reconnect the exhalation v

7. To exit Tech. Setup and USER SETUP, press the Silence/Reset button twice.

NOTE: If the pressure relief valve is adjusted, perform Pressure

ransducers Calibration and Volume Factor Calibration again.

EXHALATION VALVE CALIBRATION

alve tubing to the exhalation valve connector.

5-6 SERHT50NA A0808

WARNING Each time an exhalation valve is replaced it must be calibrated.

Page 68

SECTION 5

OPERATIONAL SET-UP

1. Connect the HT50 patient breathing circuit to the v

entilator. Connect an adult test lung with restrictor or use test lung (LNG800P) or occlude the patient side of the exhalation valve.

2. Press the On/Standby button once to enter Settings condition.

3. Press the Manual Inflation button once, then again within three seconds.

4. The HT50 will start the exhalation valve calibration and the ventilator will automatically test the exhalation valve. If it passes the test, the messages "Cal Completed", then "Press ON to Vent" will be displayed.

5. If the test fails, the message "Cal Failed" will be displayed.

• Press the Silence/Reset button.

• Check the integrity of the circuit, connections and test lung, then press the Manual Inflation button twice to initiate calibration again.

1. Connect the 500 cc test lung to the patient connection on the exhalation valve.

2. If testing model HT50-H (w/ humidifier), the humidifier should no longer be bypassed. The patient circuit should be connected to the output of the humidifier chamber and the humidifier tubing should be connected between the input to the humidifier chamber and the connector on the ventilator labeled “GAS OUTPUT.”

3. With the ventilator in the Standby condition, press the On/Standby button once to enter Setting condition. Adjust controls to the following Standard Test Settings:

MODE

A/CMV

Volume Control 500 mL t

1.0 sec ƒ 15 b/min P trig 1 cmH Paw alarm 3 cmH

•

alarm 1 L/min min ▼ / 50 L/min max ▲

99 cmH

O/mbar

O/mbar ▼Paw /

O/mbar ▲_Paw

PEEP/CPAP 0 cmH2O/mbar P support 0 cmH

O/mbar

Humidifier Off

SERHT50NA A0808 5-7

Page 69

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

PRESSURE VERIFICATION

1. Connect the T-connector between the test lung and the exhalation valve. Connect the tubing from the T-connector to a calibrated pressure gauge.

2. Press the ▲Up control button to select “Paw P M B” in the Message Displa begin ventilation.

NOTE: Whenever an alarm message is in the Message Display Windo

w, the user cannot select pressure or volume measurements for

display.

y Window. Press the On/Standby button to

P trig

PEEP / CPAP

3. Set t

to 2.0 seconds. Verify that the peak pressure displayed on

both the calibrated pressure gauge and the Message Display Window (i.e. “P”) are within 10% of each other.

4. Leave calibrated pressure gauge connected.

1. Set tIto 1.0 second and set ƒ to 1 b/min. Trigger breaths by squeezing the test lung hard enough to create a negative pressure equal to or greater than 1 cmH

O/mbar.Verify the P

trig indicator blinks and the ventilator delivers a mandatory breath with each successful squeeze of the test lung.

2. Set ƒ to 15 b/min and Ptrig to 0.2 cmH

O/mbar.Verify that there

is no auto-triggering.

1. Connect the Rp50 parabolic resistor between the T-connector and the test lung.

5-8 SERHT50NA A0808

2. Set Volume Control to 250 mL, PEEP to 5, and Ptrig to 1.0. After a few breaths, verify that the baseline pressure measurements for the Paw meter and the Message Display Window are both 5 ±1 cmH

O/mbar. If necessary, increase

Ptrig level until there is no auto triggering. Verify the Ptrig level does not exceed 1.5 cmH

O/mbar.

3. Set PEEP to 15. After a few breaths, verify that the baseline pressure measurements for the Paw meter and the Message Display Window are both 15 ±2 cmH

O/mbar. If necessary,

increase Ptrig level until there is no auto triggering. Verify the Ptrig level does not exceed 2 cmH

O/mbar.

Page 70

PRESSURE CONTROL

SECTION 5

1. Set ventilator to Standard Test Settings.

2. Press the Pressure Control button, then adjust the Pressure Control setting to 15 cmH

3. Verify both the Message Display Window and the calibrated pressure gauge indicate 15 ±2 cmH

O/mbar. Set tIto 3.0 seconds.

O/mbar.

4. Set Pressure Control to 30 cmH

5. Remove T-connector, leaving the Rp50 inline.

EXHALATION VALVE SEALING

1. Set the HT50 to Standard Test Settings. Set the ƒ to 5.

2. Change the Volume Control setting so that the Paw meter

3. Verify there is no gas leakage from the exhalation valve during

MANUAL INFLATION

1. Set ventilator to the Standard Test Settings. Set ƒ to 1. Press

O/mbar.Verify the Message

Display Window and the calibrated pressure gauge indicate 30 ±3 cmH

reaches 70 ±5 cmH

O/mbar.

O/mbar during inspiration.

inspiration.

and release the Manual Inflation button.

HIGH ▲Paw ALARM

SERHT50NA A0808 5-9

2. Verify that a manual inflation occurs each time the Manual Inflation button is pressed. Verify inflation is terminated when the button is released. Set ƒ to 15.

1. Set High ▲Paw alarm to 20 cmH2O/mbar.Verify that (1) an audible and visual High ▲Paw alarm occurs, (2) inspiration is

minated, and (3) maximum pressure displayed on the Paw

ter meter is 20 ±4 cmH

2. Set the High ▲Paw back to 99 cmH

O/mbar.

O/mbar and press the

Silence/Reset button to clear the visual alarm.

Page 71

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

LOW ▼Paw ALARM

1. Disconnect the test lung from the breathing circuit and verify that after 2 breaths, both an audible and visual Low ▼Paw

m occurs.

Alar

2. Attach the test lung to the breathing circuit and verify that the audible alarm ceases. Press the Silence/Reset button to clear the visual alarm.

CHECK PROX LINE ALARM

1. Disconnect the Proximal Airway Pressure Line at the ventilator connection and verify that both an audible and visual Check Prox Line Alarm occurs.

2. Reconnect the Proximal Airway Pressure Line to the ventilator. Verify that the audible alarm ceases. Press the Silence/Reset to clear the visual alarm.

BATTERY TEST

NOTE: Before proceeding with this test, ensure that the HT50 has

been connected to an external power source for the purpose of charging the Int. Battery.

1. Press and hold the Int. Battery button. Verify the charge level on the Paw meter is in the blue area, and there is no “Charge Fault” message in the Message Display Window.

2. Disconnect the A.C. power cord, verify the “Ext. Power” visual and audible alarm occurs, the charging indicator illuminates red, the Int. Battery indicator turns on, and “No Ext. Power” message is displayed in the Message Display Window.

3. Silence the alarm. Press and hold the Int. Battery button. Verify the charge level on the Paw meter is in the blue area after 5 minutes.

4. Reconnect the AC. power cord, verify the Int. Battery LED turns off and the Ext. Power LED indicator changes to green.

5. Repeat steps 2-4, allowing 90 seconds to elapse prior to reconnecting to AC power. Verify the HT50 switches back to A.C. power between 30 and 90 seconds later.

5-10 SERHT50NA A0808

Page 72

HUMIDIFIER

SECTION 5

1. Connect the temperature probe to the ventilator. Attach an empty humidifier bottle to the ventilator (no water or heat sink).

2. Use the HT50 On/Standby button to enter the Settings condition. Press the Humidifier On button and adjust the set target temperature to 39 ºC. Press the Humidifier On button to accept.

3. Verify the continuously displayed temperature is stable and is approximately room temperature for at least 5 seconds.

4. Use the HT50 On/Standby button to enter the ON condition. Verify the continuously displayed temperature is stable and is approximately room temperature for at least 5 seconds.

5. Disconnect the humidifier bottle. Verify that the audible and visual “Humidifier Fail” alarm occurs.

6. Reconnect the humidifier bottle. Clear the alarm message by pressing the Silence/Reset button. Press the Humidifier On button.

7. Disconnect the temperature probe from the Temp Probe inlet jack beneath the Mainflow Outlet Manifold. Verify that the audible and visual “Temp Probe” alarm occurs.

8. Reconnect the temperature probe. Clear the alarm message by pressing the Silence/Reset button.

9. Remove the humidifier bottle and replace the heat sink. Reinstall the bottle on the HT50.

SERHT50NA A0808 5-11

Page 73

CALIBRATION / OPERATIONAL VERIFICATION PROEDURE

TEST RECORD FOR HT50

Hospital/Organization__________________________________________________________________ Model No. HT50-H1-B _________ Serial No. ___________________ Software Version ____________ Hour Meter ________________ Tested By _______________________________________________ Date _____________________ Released By _____________________________________________ Date _____________________

OVP TESTS PASS REMARKS

Pre-Test Inspection Front Panel Test System Leak Test Pressure Calibration P1= P2= Pressure Meter Calibration Volume Calibration Volume factor = ___________ Pressure Relief Calibration Exhalation Valve Calibration Pressures Verification P trig PEEP / CPAP Pressure Control Exhalation Valve Sealing Manual Inflation High Paw Alarm Low Paw Alarm Check Prox Line Alarm Battery Test Humidifier

TEST EQUIPMENT IDENTIFICATION ID NO.

Calibration Analyzer Oxygen Analyzer Electrical Safety Analyzer Digital Multimeter

ELECTRICAL SAFETY TEST COMMENTS

TEST TOLERANCE ACTUAL

Ground Resistance < 0.1Ω Maximum Leakage < 500 µA

The HT50 is operational when all tests have been performed successfully.

5-12 SERHT50NA A0808

Page 74

6. MAINTENANCE PROCEDURES

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Parts Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Routine Maintenance Procedure . . . . . . . . . . . . . . 6-2

Annual Maintenance Procedure . . . . . . . . . . . . . . 6-3

10,000 Hour Maintenance Procedure . . . . . . . . . . 6-4

SERHT50NA A0808

Page 75

INTRODUCTION

SECTION 6

The HT50 ventilator requires routine maintenance for best performance and technical maintenance every 10,000 hours. It is recommended that the primary internal battery be replaced every 12 months. If the primary internal battery is used to LOW BATTERY alarm level on a routine basis, the battery life will be shortened. It is recommended that the secondary internal battery be replaced every 24 months. If the dual internal battery no longer meets the time requirements of the user, it should be replaced.

NOTE: When 10,000 hours has elapsed, the HT50’s Message

y Window will indicate “Service Needed” after the next power

Displa up.

WARNING After every technical maintenance, the Calibration and Oper performed successfully before returning the HT50 to patient use.

WARNING Lethal voltages are present inside the ventilator.To

vent electrical shock, use extreme caution when working on

pre the ventilator with the front or bottom cover panel opened.

ational Verification Procedure (Section 5) must be

TOOLS REQUIRED

When preparing to return service replacement parts clearly identify them as such, and return them to N information:

• Date

• Ventilator serial number

• Contact name

• Organization name

• Organization address

• Reason for replacement

• Copy of completed OVP test record (Section 5)

Follow the shipping instructions detailed in Section 10 of this manual.

Contact NEWPORT Tech. Service for more information. Tel.

714.427.5811, ext. 500 or fax 714.427.0572.

Computer with PCS download program Download cable P/N V23-00001-29 #10 Torx screwdriver Philips head screwdriver 7/64" Allen wrench Torque screwdriver (for #10 torx & 7/64" allen)

EWPORT with the following

SERHT50NA A0808 6-1

NOTE: All allen head and #10 torx screws are tightened to 12 inch/lbs

Page 76

MAINTENANCE PROCEDURES

PARTS REQUIRED

1 ea. V11-21000-60 Pump Assembly 1 ea. G19-00001-29 Internal Battery, Lead Acid 1 ea. HT460300 Air Intake Filters, 5 pk 1 ea HT6004701 Proximal Inline Filters, 5 pk 1 ea V09-13130-60 Internal Battery, NIMH

NOTE: The items listed above are not offered as a kit, since they are replaced at diff

ROUTINE MAINTENANCE PROCEDURE

Inspection of the Ventilator

NOTE: While performing the maintenance, visually inspect all parts of

the ventilator for wear or damage. Replace parts as necessary.

1. Power Cord

• Inspect the power cord to ensure that there are no exposed wires. If damage is noted, replace power cord.

• Inspect the ends of the power cord to ensure that the plugs do not show excessive wear.

erent intervals.

Cleaning the HT50 Ventilator

2. Front Panel Overlay

• Inspect the front panel overlay to ensure that there are no raised edges or cuts in the overlay that would allow moisture underneath the panel.

3. Humidifier Assembly (HT50-H model only)

• Inspect the humidifier chamber for any stress fractures or cracks. Replace as necessary.

• Inspect the heater plate for corrosion and clean as necessary.

WARNING Before disassembly of parts on the inside of the HT50 tak discharged.

Wipe the surfaces of the ventilator with a damp cloth containing a mild medical detergent.

Caution Do not use agents containing acetone, toluene, halogenated h or ventilator housing.

es place, the HT50 power supply needs to be

ydrocarbons, or strong alkalines on the face panel

6-2 SERHT50NA A0808

NOTE: Alcohol may be used to sanitize the face panel and

entilator housing. Care should be taken not to allow liquids to

v penetrate the ventilator.

Page 77

Changing the Air Inlet and Proximal InlineFilters

WARNING Do not reverse the filters. Always replace them if dirty

or contaminated.

Remove the Air Inlet Filter Cover (#8) by loosening the three (3)

thumbscrews.

2. Remove and discard the old filter. Install the new filter (p/n

HT460300), making certain that the filter media is laying flat within the counterbore of the cover.

3. Reinstall the Air Inlet Filter Cover, making certain that the filter

media remains in place and the three thumbscrews are tightened securely.

4. Remove and discard the old Proximal Inline Filter and tubing.

Replace with new filter/tubing assembly (p/n HT6004701).

SECTION 6

ANNUAL MAINTENANCE PROCEDURE

NOTE: Perform all Routine Maintenance procedures with the addtion of

the following to replace the internal battery.

Discharge the HT50 Power Supply

1. Discharge the HT50 power supply per Discharge the HT50

Power Supply in Section 8.

Removal of Lower Case Assembly

1. Remove the lower case assembly per Disassembly (lower

case) in Section 8.

2. Remove the lower case cover, carefully avoiding tension on

the battery wire harness. Disconnect the 3 connectors at the dual pack battery circuit board connecting the dual pack battery circuit board to the main board. See figure 8-1.

3. To reinstall the lower case assembly reverse above steps.

SERHT50NA A0808 6-3

Page 78

MAINTENANCE PROCEDURES

Replacement of Internal Primary Battery

1. Replace the Internal Primary Battery per Removal of Internal Primary Battery in Section 8.

Operational Verification Procedure

Upon completion of the internal battery replacement, perform all calibrations and Operation Verification Procedures as detailed in Section 5.

Replacement of the Internal Secondary Battery

NOTE: To ensure the NiMH battery can supply adequate power to

the HT50 after the LOW BATTERY alarm Newport recommends the NiMH battery to be replaced every 2 years or if the NiMH battery no longer meets the time requirements of the user, it should be replaced.

1. Replace the Internal Secondary Battery as per Removal of Internal Secondary Battery in Section 8.

Operational Verification Procedure

Upon completion of the internal battery replacement, perform all calibrations and Operation Verification Procedures as detailed in Section 5.

10,000 HOUR MAINTENANCE PROCEDURE

Replacement of Pump Assembly

NOTE: The Pump Assembly is scheduled to be replaced every

10,000 hrs. The pump should also be replaced if it exhibits any unusual noise or if it appears to be malfunctioning in any way.

1. Replace the Pump Assembly as per Pump Assembly Replacement in Section 8.

Setting “Next Service Due Meter”

6-4 SERHT50NA A0808

After replacing the pump assembly due to the 10,000 hour maintenance or for any reason, it is necessary to properly set the next service due meter. Set “Next Service Due Meter” per setting “Next Service Due Meter” in Section 8.

Page 79

Burn-in Test

1. To complete the burn-in test, set the ventilator to the Standard

2. Let the ventilator operate for 24 hours.

Operational Verification Procedure

Upon completion of the Burn-in test, perform all calibrations and Operation Verification Procedures as detailed in Section 5.

SECTION 6

WARNING The ventilator is a critical life support device. Upon

replacement of any critical assembly, it is important to complete a 24 hour burn-in to assure proper operation.

Test Settings detailed in Section 5.

SERHT50NA A0808 6-5

Page 80

Page 81

7. TROUBLESHOOTING GUIDE

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Mechanical and Pneumatic Troubleshooting . . . . . 7-2

Electronic Troubleshooting . . . . . . . . . . . . . . . . . . . 7-5

SERHT50NA A0808SERHT50NA A0808

Page 82

INTRODUCTION

SECTION 7

This troubleshooting guide is intended to assist a NEWPORT authorized service technician to troubleshoot and repair the HT50 ventilator.

The troubleshooting instructions are separated into two sections:

• Mechanical and Pneumatic

• Electronic.

NOTE: Refer to the Troubleshooting section of the Operating

ual for more clinically oriented ventilator problems.

man

WARNING Hazardous voltages are present inside the

entilator. Disconnect electrical power and oxygen sources

v before attempting any disassembly. Failure to do so could result in injury to service personnel or equipment.

Further questions or problems should be addressed to the Technical Service Department at Newport Medical Instruments.

800.451.3111 (USA only) or 1.714.427.5811 ext. 500 FAX 1.714.427.0572 email: TechSupport@NewportNMI.com

Or write to:

Technical Service Department NEWPORT MEDICAL INSTRUMENTS, INC. 1620 Sunflower Avenue Costa Mesa, California 92626 USA

SERHT50NA A0808 7-1

Page 83

TROUBLESHOOTING

MECHANICAL & PNEUMATIC TROUBLESHOOTING

PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION

Ventilator fails System Leak Test.

Ventilator fails Pressure Transducer and/or Pressure Relief Valve calibration.

Pump is pulling in air from around the air inlet filter cover.

Muffler Assembly is disconnected or leaking or is cracked.

Silicone cuff around ends of muffler may be old.

Leak in the patient circuit Assembly

Torn or improperly sealed manifold diaphragm.

Make certain that the filter media is positioned within the counterbore of the cover and that the thumbscrews are tightened securely.

Verify Muffler Assembly is securely connected to both the pump inlet and the air intake. With the air intake filter cover removed, verify that the end of the muffler is flush with the ventilator housing. Visually inspect muffler assembly for cracks. Replace if cracked.

Replace as needed.

Make certain that the humidifier chamber is bypassed for these tests.The breathing circuit tubing should be directly connected to the GAS OUTPUT connector. Also, verify that the exhalation valve is not leaky at the highest pressure level. If so, replace exhalation valve.

Note: When performing the Pressure Relief Valve calibration, if an alternate Newport approved exhalation v it may begin to leak at lower maximal pressures than the permanent blue exhalation valve. This is a limitation of the exhalation valve and the HT50 driving pressure. The ventilator is performing appropriately.

Remove manifold pump and inspect disphragm. Replace if damaged.

alve is used

Low proximal pressure (Paw), but normal flows.

Faulty patient breathing circuit.

Humidifier chamber leaking.

Pressure transducer out of calibration.

Faulty exhalation valve.

Pressure relief valve or emergency intake valve leaking.

7-2 SERHT50NA A0808

Check breathing circuit for leaks and/or proper connections.

Bypass chamber and retest. If problem is solved, loosen, reposition, and tighten chamber cover. Retest.

Calibrate entire HT50 (see Section 5)

Recalibrate exhalation valve (Section 5). If problem persists, replace valve.

Check both valves for proper sealing. Perform the Pressure Relief Valve calibration (Section 5).

Page 84

SECTION 7

PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION

Low proximal pressure (Paw) and low flows at Gas Output connector.

“Motor Fault” Device Alert alarm, or no Device Alert alarm, but proximal pressure is rising slower than expected.

Unstable baseline.

Pressure relief valve or emergency intake valve leaking.

Air inlet filter clogged.

Internal leak in the pump (i.e. ruptured diaphragm, leaking one way valve).

Blocked air inlet.

High FIO2selected on Air/O2mixer, and oxygen supply is depleted.

Breathing circuit leak.

Check both valves for proper sealing. Perform the Pressure Relief Valve calibration (Section 5).

Replace air inlet filter.

Check diaphragm, replace if damaged. Tighten 4 screws connecting the pump to the left side. If problem persists, replace the Pump Assembly.

Replace air inlet filter.

Verify sufficient oxygen supply. Replace as needed. If problem continues, remove Air/O2mixer. If problem is resolved, replace Air/O2mixer. If problem persists, replace Pump Assembly.

Check breathing circuit for leaks and/or proper connections. Make certain “star” tubing is not a direct connection to any HT50 connectors.

Exhalation valve is not calibrated.

Internal solenoid is not functioning properly.

Main board not calibrated correctly.

Calibrate the exhalation valve (Section 5). If the valve fails calibration, replace. If valve passes but problem persists, try a new valve.

Verify that both ends of the tubings connected to the solenoid are secure. Verify that the tubing from the Gas Output connector and the internal pressure transducers are secure. Calibrate the exhalation valve. Retest for baseline stability. If the problem persists, replace the Pump Assembly

(Note: Solenoid is part of the pump.)

Calibrate entire HT50 (see Section 5)

SERHT50NA A0808 7-3

Page 85

TROUBLESHOOTING

PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION

Baseline shows PEEP w/ PEEP set to zero.

Proximal pressure returns to baseline very slowly.

Pump is emitting “squeaking” noise.

Water inside exhalation valve diaphragm.

Kinked or obstructed exhalation or proximal pressure tubing.

Paw meter needs calibration.

Contaminated solenoid.

Kinked or obstructed proximal pressure line.

HME causing resistance to exhalation.

Contamination on the piston rods. Using alcohol and a non-residue type

Disconnect the exhalation drive line tubing, then turn exhalation valve upside down to allow any water that is trapped to exit. If problem still persists, replace exhalation valve.

Check and correct as needed. Replace inline proximal filter.

Calibrate. (See Section 5.)

Replace Pump Assembly.

(Note: Solenoid is part of the pump)

Check and correct as needed. Replace inline proximal filter.

Remove/change HME.

material (i.e. gauze), gently clean piston rods. If problem is not corrected, replace Pump Assembly.

Pump is emitting “ticking” noise.

Pump loudness seems to be much greater than normal.

Vibration noise (i.e. bezel, humidifier, retaining arm, etc.)

Front panel cover is loose, rattling, or not shutting properly.

Unit triggers with PEEP set > 0

Loose bearing. Replace Pump Assembly.

Large leak in breathing circuit.

Internal muffler is disconnected.

Problem with Pump Assembly

Improper Assembly Secure all external screws to 12" lbs.

Physical damage to the front panel cover.

Leak in circuit.

Exhalation valve not calibrated.

Resolve leak.

Open lower case and make sure that the muffler is connected securely at both ends with the appropriate silicone cuff. Perform System Leak Test in Section 5.

Replace Pump Assembly.

Tighten all thumbscrews or knobs securely.

Remove and replace front panel cover. Verify that the springs are present on both ends of the cover.

Check circuit for leaks.

Calibrate exhalation valve.

7-4 SERHT50NA A0808

Page 86

SECTION 7

ELECTRONIC TROUBLESHOOTING

PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION

Ventilator does not operate on internal battery.

Ventilator is unable to switch from DC power back to AC power.

10 V SHUTDOWN Device Alert Alarm

Battery fully discharged.

Battery fuse defective.

Defective Main PCB.

Defective Power Supply PCB.

Defective Main PCB.

Defective Main PCB. Replace Main PCB.

Connect HT50 to A.C. power, allowing battery to charge for several hours, then check charge level. If the battery does not seem to be charging, disconnect the battery wiring harness from the charger. Check the voltage across the battery wiring harness connector. If voltage is > 0 volts but < 8 volts, replace battery.

Check the voltage across the battery wiring harness connector. If voltage is 0 volts, replace fuse.

Replace Main PCB.

If ventilator functions normally on internal battery, replace Power Supply PCB.

Replace Main PCB.

OCCL. SHUTDOWN Device Alert Alarm

SYSTEM ERROR Device Alert Alarm

MOTOR FAULT Device Alert Alarm

Prox line kinked or prox filter occluded.

Defective Solenoid.

Defective Main PCB.

EPROM not seated firmly.

Battery completely empty or disconnected during ventilation.

Defective Main PCB.

Pump is unable to get sufficient air intake.

Defective Pump Assembly

Defective Main PCB.

Replace prox line filter and check prox line for obstruction.

Replace Pump Assembly.

Replace Main PCB.

Make certain EPROM is firmly in the socket.

Check battery connectors and fuse. Charge battery.

Replace Main PCB.

Check air intake filter. Replace as needed. If using Air/O2mixer, verify sufficient tank supply pressure.

Replace Pump Assembly.

Replace Main PCB.

SERHT50NA A0808 7-5

Page 87

TROUBLESHOOTING

PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION

Meter does not calibrate.

Humidifier Fail alarm (HT50-H)

Meter is holding static charge.

Defective meter.

Loss of A.C. power.

Improper installation of the chamber or temperature probe.

Defective temperature probe.

Humidifier heater Assembly is defective.

Using a cloth with alcohol, gently wipe the surface area of the front panel that covers the meter. Recalibrate.

Replace panel PCB.

Restart humidifier when A.C. power is available.

See Operating manual for installation instructions.

Replace temp. probe.

With humidifier chamber firmly secured, disconnect the square four pin connector on the Main PCB. Using an ohmmeter, measure the resistance between the pins of the two blue wires. Resistance should be < 3000 ohms, but > 0. Next, measure the resistance between the pins of the two black wires. Resistance should be approx. 4 ohms. If either of these measurements are incorrect, replace the heater Assembly

High Prox Temp alarm (HT50-H)

LED(s) and or control panel button(s) do not function.

Unit auto triggers

Defective temperature probe.

Defective connection to Main PCB.

Defective Main PCB.

Ribbon cable not securely fastened.

Defective Panel PCB.

Relief vavle set too high or pressure transducers out of calibration.

Replace temp. probe.

Using an ohmmeter, verify continuity from probe connector to Main PCB.

Replace Main PCB.

Verify that both ends of the ribbon cable are securely fastened.

Replace Panel PCB.

Perform a complete HT50 calibration (see Section 5)

7-6 SERHT50NA A0808

Page 88

8. ELECTRONIC & PNEUMATIC COMPONENT REMOVAL &

REPLACEMENT PROCEDURES

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Discharge the HT50 Power Supply . . . . . . . . . . . . 8-2

Disassembly (Lower Case) . . . . . . . . . . . . . . . . . . 8-2

Internal Battery Assembly Replacement . . . . . . . . 8-3

Pump Assembly Replacement. . . . . . . . . . . . . . . . 8-5

Outlet Assembly Replacement. . . . . . . . . . . . . . . . 8-7

Humidifier Heater Assembly Replacement . . . . . . 8-8

Front Panel Board Replacement . . . . . . . . . . . . . . 8-9

Front Panel Bezel Replacement . . . . . . . . . . . . . . 8-9

Main Board Assembly Replacement . . . . . . . . . . 8-10

Power Supply Board Replacement . . . . . . . . . . . 8-10

SERHT50NA A0808

Page 89

INTRODUCTION

SECTION 8

The following assemblies are replaceable during service, if they are worn, damaged or suspected to be performing improperly.

• Internal battery assembly

• Pump assembly

• Outlet assembly

• Humidifier assembly

• Front panel PCB assembly

• Main board assembly

• Power supply assembly

Parts that are removed from the ventilator for warranty exchange are to be placed in their replacement box with the following information:

✓ Date ✓ Ventilator serial number ✓ Contact name ✓ Organization name ✓ Organization address ✓ Reason for the replacement: perf

complaint that initiated the replacement

✓ Copy of the completed OVP test record ✓ Total operating hours

ormance observations or user

TOOLS REQUIRED

Follow the shipping instr

Replacement parts and assemblies which are returned to the manufacturer in the proper manner will be credited according to the warranty core charge list. Contact Newport Service Department for more information. 1.714.427.5811, ext. 500 Fax: 714.427.0572

Warning Hazardous voltages are present inside the ventilator. Disconnect electr attempting any disassembly. Failure to do so could result in injury to service personnel or equipment.

#10 torx screwdriver Phillips head screwdriver 7/64" Allen wrench Torque screwdriver (for #10 torx & 7/16" Allen)

NOTE: All allen head and size #10 torx screws are tightened to 12 in-lb torque

uctions detailed in Section 10.

ical power and oxygen sources before

SERHT50NA A0808 8-1

Page 90

ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT

WARNING Before disassembly of parts on the inside of the

HT50 takes place, the HT50 power supply needs to be discharged.

DISCHARGE THE HT50 POWER SUPPLY

NOTE: Refer to pg. 3-26, External Power Connector, for proper

connection of an external DC power source.

1. Connect a DC power source to the external power connector on the HT50. Leave the external DC power source connected to the HT50 for at least 10 seconds.

2. After 10 seconds has elapsed, remove the external power source. Only after the HT50 power supply has been discharged is it safe to remove components from the inside of the HT50.

DISASSEMBLY (Lower Case)

1. Remove the 6 ea. #10 torx screws securing the lower case (1) of the HT50 to the ventilator housing.

2. Remove the lower case cover, carefully avoiding tension on the battery wire harness. Disconnect the 3 connectors at the dual pack battery circuit board connecting the dual pack battery circuit board to the main board. See figure 8-1.

3. To reinstall the lower case assembly reverse above steps.

Three connectors to

be disconnected

8-2 SERHT50NA A0808

Figure 8-1

Page 91

INTERNAL BATTERY ASSEMBLY REPLACEMENT

Removal of the Primary Internal Battery

1. Remove lower case assembly. See Above Steps

2. Disconnect the 2 cables on the dual pack battery circuit board connecting the NiMH battery to the circuit board.

3. Disconnect the 2 cables on the dual pack battery circuit board connecting the lead acid battery and the transistor to the circuit board. See Figure 8-2

4. Remove the 10 ea #10 torx screws (6) securing the battery case (2) to the lower case cover. Loosen the strain relief securing the battery wiring harness to the battery case. Remove the battery case.

5. Remove the battery wiring harness from the old battery and install it onto the new battery. Make certain the red wire terminal connector with the in-line fuse is attached to the positive (+) terminal and the black wire terminal connector is attached to the negative (-) terminal on the battery.

SECTION 8

6. Write the installation date and hours of the HT50 on the side of the new battery.

7. Lay the battery on the side with the negative terminal closest to the lower case, tighten the strain relief securing the battery wiring harness to the battery case, secure the battery cover over the battery using the 10 torx screws removed in step 4.

8. Connect the 3 connectors at the dual pac battery circuit board (Figure 8-1). Gently insert the lowering assembly into the HT50. Pay attention to not pinch the harness.

9. Tighten the 6 torx screws to secure the lower case assembly.

Two

connectors

to be

disconnected

SERHT50NA A0808 8-3

Figure 8-2

Page 92

ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT

Caution The HT50 ventilator contains an internal sealed lead

acid battery. After replacing the battery, be certain to recycle or dispose of it properly.

Removal of the Secondary Internal Battery

1. Remove lower case assembly. See above steps

2. Disconnect the 2 cables on the dual pack battery circuit board connecting the NiMH battery to the circuit board. See figure 83

3. Remove the 2 ea. Phillips screws securing the NiMH battery pack to the NiMN battery bracket. See figure 8-4

4. Install the new NiMH battery by reversing the above steps.

NOTE: The NiMH battery comes with a thermal pad already installed. not facing the NiMH bracket.

Be sure to install the NiMH battery so the thermal pad is

Two Connectors

Disconnected

8-4 SERHT50NA A0808

Figure 8-3

Page 93

PUMP ASSEMBLY REPLACEMENT

SECTION 8

Figure 8-4

Refer to Figure 9-1 (Internal View).

1. Follow steps 1- 3 in the DISASSEMBLY (Lower Case) section.

2. Disconnect the solenoid two-pin wiring harnesses from the Main harness by pressing the release tab on each connector.

3. Slide the Muffler Assembly (#13) from the pump inlet by pushing and twisting it back and forth until it disengages from the silicone cuff on the pump. After disconnecting the Muffler Assembly from the pump inlet, rotate it toward the rear panel of the ventilator housing so that it creates minimal interference with the removal of the pump.

4. Remove the four (4) #10 torx screws (#28) securing the pump to the ventilator housing. These screws are located externally near the Main Flow Outlet Manifold of the ventilator.

5. Remove the 6 pin power supply wiring harness connector from the Main PCB JP8 by pressing the release tab on the connector.

6. Remove the two (2) silicone tubes (#38 & 49) from the Solenoid.

SERHT50NA A0808 8-5

7. Gently slide the Pump Assembly out of the ventilator housing.

Page 94

ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT

NOTE: Before installing the new Pump Assembly, make certain

the diaphragm in the new pump is clean and is properly seated in the pump housing counterbore.

8. Before installing the new Pump Assembly, refer to Figure 9-5. Make certain to attach each tube to the identical connector on the new solenoid.

9. Install replacement Pump Assembly by reversing steps 2 through 7.

NOTE: When sliding the Muffler Assembly (#13) back into place, open the air intak the muffler is flush with the ventilator housing. This will minimize the possibility of a leak around either Muffler connection.

10. Remove Front Panel Assembly per Front Panel Board Replacement in this section.

11. Verify the silicone tube (#12) covers the Muffler Assembly (#13) and the air intake connector on the side pane (#5).

e filter cover (8) and make certain that the end of

Setting “Next Service Due Meter”

12. Reinstall the Front Panel Assembly.

13. Re-assemble the ventilator per instructions on pg. 8-2.

After replacing the pump assembly due to the 10,000 hour maintenance or for any reason, it is necessary to properly set the next service due meter. Follow these steps:

1. Record the current hours meter reading.

2. Connect the HT50 to the computer with the PCS download

program via the communication cable P/N V23-00001-29.

3. Connect the HT50 to an AC power source.

4. Start the PCS download program.

5. Select the project (current version is 1.071, however, yours may

be different)

8-6 SERHT50NA A0808

6. The tables in the PCS download program will fill up with

information from the HT50 Ventilator.

Page 95

SECTION 8

7. Locate the label

8. Press the download button in the upper right corner of the PCS download program.

9. A window will show the progress of the download. While the software is being downloaded, select and highlight the “NextService” label. Change the number according to the hour meter reading and press the enter key.

NOTE: The “NextService” number comes from the factory set to

This indicates the “Service Needed” message will appear when

10.

the HT50 hour meter reading equals 10,000 hours. If the motor pump was replaced at 10,000 hours, the “NextService” number should be changed to 20. If the motor pump was replaced at 7,500 hours, the “NextService” number should be changed to 17.5.

10. Do not remove the communication cable or close the PCS

download program until these 3 END of download criteria have been met.

1. The program has completed the download.

“NextService”.

2. The green LED for external power is illuminated.

3. The bottom of the PCS download program displays the message “Done Downloading Data”

OUTLET ASSEMBLY REPLACEMENT

Refer to drawing Figure 9-1, Internal View and Figure 9-5 Main Board Tubing Connections.

NOTE: The outlet assemblies are different between the HT50-H and HT50-H1 models.

The Outlet Assemb

• Damage to either of the 3 connectors is visible.

• Emergency Intake Valve is leaking (rear of outlet block).

• Pressure Relief Valve is leaking at low pressure (bottom of outlet block).

1. Follow steps 1 through 7 of the PUMP ASSEMBLY REPLACEMENT section.

ly should be replaced if:

SERHT50NA A0808 8-7

2. Remove the four (4) silicone tubes attached to the Outlet Assembly, marking them to avoid improper reattachment.

3. Remove the two (2) #10 torx screws (#31) which secure the Outlet Assembly to the ventilator housing.

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ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT

4. Install the new Outlet Assembly, making certain the o-ring seal and the humidifier’s heater wires (HT50-H only) are within the counterbore of the Outlet Assembly so that neither are pinched by the Outlet Assembly when securing it to the ventilator housing.

5. Reverse steps 1 through 3 to reassemble.

HUMIDIFIER HEATER ASSEMBLY REPLACEMENT (HT50-H ONLY)

Refer to drawing Figure 9-1, Internal View.

The Humidifier Heater Assembly should be replaced if:

• the humidifier chamber is securely fastened but the safety thermostat activates, turning the heater off.

• the assembly is cracked or physically damaged.

• the heater plate does not rise and activate the safety switch beneath it when the humidifier chamber is removed.

1. Follow steps 1 through 3 in the previous Outlet Assembly Replacement section.

2. Remove the two (2) #10 torx screws (#27) that secure the Humidifier Heater Assembly to the ventilator housing.

3. Disconnect the humidifier heater’s wiring assembly connector from the Main PCB by pressing the release tab on the connector. Pull the connector out through the hole in the ventilator housing to remove the old Assembly

4. Place the connector of the new Humidifier Heater Assembly through the hole in the ventilator housing.

5. Place the Outlet Assembly (#30) over the heater assembly’s wiring harness, making certain that it is not pinched and that the o-ring seal of the Outlet Assembly is properly in place.

6. Secure the Outlet Assembly to the ventilator housing with 2 ea. #10 torx screws (#31).

7. Secure the Humidifier Heater Assembly to the ventilator housing with two (2) #10 torx screws (#27).

8-8 SERHT50NA A0808

8. Reattach the wiring harness connector to the Main PCB.

9. Reverse step 1 to reassemble.

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FRONT PANEL BOARD REPLACEMENT

Refer to drawing Figure 9-2, Final Assembly Front View.

The Front Panel PCB should be replaced if:

• any of the front panel buttons, displays, or alarms are malfunctioning.

• the analog meter is malfunctioning.

1. Remove the six (6) 7/64" allen screws (#49) from the Front Panel bezel. Gently separate the bezel from the main ventilator housing.

2. Disconnect two (2) connectors (JP1 & JP2) from the Front Panel PCB.

3. Place the Front Panel Assembly face down on a flat surface. Remove the ten (10) Philips head screws securing the Front Panel PCB to the front panel plate.

SECTION 8

NOTE: Some older HT50 units have nine (9) Phillips scre

securing the Front Panel PCB to the front panel plate.

4. Remove Front Panel PCB and place it inside an anti-static bag.

5. Remove the protective plastic cover from the analog meter. Install the new Front Panel PCB, by reversing steps 1 through 3.

FRONT PANEL BEZEL REPLACEMENT

Refer to drawing Figure 9-2, Final Assembly Front View.

The Front Panel Bezel should be replaced if:

• the bezel is cracked or dented

1. Follow steps 1 through 4 in the FRONT PANEL BOARD REPLACEMENT section.

2. Remove the six (6) #10 torx screws securing the front panel plate to the bezel. Gently separate the plate from the bezel.

SERHT50NA A0808 8-9

3. To install the new Front Panel Bezel, reverse steps 1 and 2.

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ELECTRONIC & PNEUMATIC COMPONENT REMOVAL & REPLACEMENT

MAIN BOARD ASSEMBLY REPLACEMENT

Refer to drawing Figure 9-1, Internal View, Figure 9-3, Final Assembly Front View, Figure 9-4, Main Board with Mounting Hardware and Figure 9-5 Main Board Tubing Connection.

NOTE: Any electronic malfunction that is not resolved with the replacement of the F replacing the Main PCB Assembly

1. Follow steps 1 through 3 of the DISASSEMBLY (Lower Case) section.

2. Remove the six (6) 7/64" allen screws (#49) from the Front Panel bezel. Gently separate the bezel from the main ventilator housing.

3. Disconnect two (2) connectors (JP1 & JP2) from the Front Panel PCB.

ront Panel PCB is usually resolved by

4. Disconnect all electrical connectors from the Main PCB.

5. Remove the four (4) Philips head screws (#58) securing the RS232 connector (P1) and the two transistors (Q1 & Q9) to left hand side of the ventilator housing.

6. Remove the three (3) #10 torx screws (#52 & 61) securing the Main PCB’s mounting hardware to the ventilator housing.

7. Disconnect the two (2) silicone tubes (#39 & 40) from the transducers mounted to the Main PCB, marking them to avoid incorrect reattachment.

8. Remove defective Main PCB.Transfer the mounting hardware as necessary to the new PCB.

9. Reverse steps 1 through 7 to install the new Main PCB and reassemble.

NOTE: The small white insulator should be inserted into the transistor hole. Gently tighten the scre the insulator.

ws making sure not to pinch

8-10 SERHT50NA A0808

NOTE: Make certain that the insulator and the insulating bushing are proper

ly placed.

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SECTION 8

POWER SUPPLY BOARD REPLACEMENT

WARNING Before disassembly of parts on the inside of the

HT50 takes place, the HT50 power supply needs to be discharged. See instructions on pg. 8-2.

WARNING Ensure that the HT50 is unplugged from the AC

wer source.

Refer to drawing Figure 9-1, Internal View.

The Power Supply Board should be replaced if the ventilator is inoperable with either external A.C. or D.C. power.

1. Follow steps 1 through 3 of DISASSEMBLY (Lower Case) section.

2. Remove the Filter Cover Assembly (8).

3. Remove the six (6) #10 torx screws (#5) securing the Power Supply PCB to the ventilator housing.

NOTE: These screws are located externally on the right hand side of the v black electrical socket inlet.

4. Disconnect the wiring harness from the Power Supply PCB by

5. Remove and replace the old PCB with the new assembly.

6. Reverse steps 1 through 4 to reassemble.

entilator.The two longer screws are used to secure the

pressing the release tab on the connector.

SERHT50NA A0808 8-11

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