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MR850 RESPIRATORY

HUMIDIFIER

Technical Manual

REVISION J

Copyright ©2005 Fisher & Paykel Healthcare Ltd.

Auckland, New Zealand

Fisher & Paykel Healthcare Head

France/Benelux:

Office:

Parc Silic-BalF,

PO Box 14-348,Panmure,

10 Avenue de Quebec,

Auckland 1134

Silic 512 Villebon, 91946,

New Zealand

Courtaboeuf, Cedex, France.

Email: info@fphcare.com

Tel: +33–(0)1-6446-5201

Web Site: www.fphcare.com

Fax: +33–(0)1-6446-5221

Tel: +64-(0)9-574-0100

 

Fax: +64-(0)9-574-0158

 

Australia:

USA:

36-40New Street,

Suite 101 22982 Alcalde Drive,

Ringwood, Victoria 3134,

Laguna Hills, California 92653, USA

Australia,

Tel: +1-(949)-470-3900

Tel: +61-(0)3-9879-5022

Fax: +1-(949)-470-3933

Fax: +61-(0)3-9879-5232

Toll Free: (800)-446-3908

Germany:

UK and Ireland(European Authorised Representative):

Hundsbergerstrasse 45

Unit 16, Cordwallis Park

73642 Welzheim

Clivemont Road, Maidenhead, SL6 7BU,

Germany

United Kingdom

Tel: +49-(0)7182-93777-0

Tel: +44-(0)1628626136

Fax: +49-(0)7182-93777-99

Fax: +44-(0)1628626146

2 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

TABLE OF CONTENTS

1

INTRODUCTION .................................................................................................................................

7

1.1

ABOUT THIS MANUAL..............................................................................................................................

7

1.2

GLOSSARY ............................................................................................................................................

7

1.3

DEFINITIONS ..........................................................................................................................................

8

1.4

PRODUCT APPLICATION..........................................................................................................................

8

2

HUMIDIFIER SYMBOLS.....................................................................................................................

9

3

SPECIFICATIONS.............................................................................................................................

10

3.1

MECHANICAL .......................................................................................................................................

10

3.2

ELECTRICAL.........................................................................................................................................

10

3.3

TEMPERATURE RANGE .........................................................................................................................

10

 

3.3.1

Heater Wire Mode..................................................................................................................

10

 

3.3.2 Non Heater Wire Mode..........................................................................................................

10

 

3.3.3

Alarm Parameters..................................................................................................................

10

3.4

PERFORMANCE ....................................................................................................................................

11

3.5

TRANSPORT AND STORAGE ENVIRONMENTAL CONDITIONS ....................................................................

11

3.6

STANDARDS AND APPROVALS...............................................................................................................

11

4

OPERATING MODES AND CONTROLS.........................................................................................

12

4.1

HUMIDIFIER OPERATION .......................................................................................................................

12

 

4.1.1

Heater wire operation ............................................................................................................

12

 

4.1.2

Non-HeaterWire Operation...................................................................................................

13

 

4.1.3

Stand-byOperation................................................................................................................

13

 

4.1.4

Power Up Sequence..............................................................................................................

14

 

4.1.5 Humidity Compensation (HC) mode......................................................................................

14

 

4.1.6

Breathing Circuit Recognition ................................................................................................

15

4.2

HUMIDIFIER CONTROLS ........................................................................................................................

16

 

4.2.1

Power Button .........................................................................................................................

16

 

4.2.2

Mode Button ..........................................................................................................................

16

 

4.2.3

Mute Button ...........................................................................................................................

17

4.3

TEMPERATURE DISPLAY .......................................................................................................................

17

 

4.3.1 Showing Chamber and Airway Temperature ........................................................................

17

4.4

SETUP INDICATORS ..............................................................................................................................

17

 

4.4.1

Heater wire connector ...........................................................................................................

17

 

4.4.2 Temperature / Flow Probe Connector ...................................................................................

18

 

4.4.3 Chamber Probe & Airway Probe ...........................................................................................

18

 

4.4.4 Chamber or Airway Probe Alarm with Probe connector alarm..............................................

18

 

4.4.5

Water Out Indicator................................................................................................................

19

4.5

OPERATIONAL ALARMS.........................................................................................................................

19

 

4.5.1

Temperature Indicator ...........................................................................................................

19

 

4.5.2

Non-HeaterWire Operation...................................................................................................

20

 

4.5.3

See Manual Indicator.............................................................................................................

20

5

MAINTENANCE PROCEDURES......................................................................................................

21

5.1

MAINTENANCE SCHEDULE ....................................................................................................................

21

 

5.1.1

MR850 Humidifier ..................................................................................................................

21

 

5.1.2

MR850 Temperature Probe...................................................................................................

21

5.2

SAFETY CHECK....................................................................................................................................

22

5.3

CLEANING INSTRUCTIONS.....................................................................................................................

23

 

5.3.1

MR850 Humidifiers ................................................................................................................

23

 

5.3.2

Temperature Flow Probe.......................................................................................................

23

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

3

6

TROUBLESHOOTING .....................................................................................................................

24

6.1

OPERATIONAL PROBLEMS....................................................................................................................

24

6.2

TECHNICAL PROBLEMS ........................................................................................................................

26

6.3

“SEE MANUAL” ERROR CODES.............................................................................................................

27

6.4

DIAGNOSTIC MENU..............................................................................................................................

29

 

6.4.1 Diagnostic Menu for Software Versions 5.45, 5.70...............................................................

29

 

6.4.2 Diagnostic Menu for Software Version 6.00 .........................................................................

30

 

6.4.3 Diagnostic Menu for Software Version 7.00 & 7.21 ..............................................................

31

 

6.4.4 Diagnostic Menu for Software Version 7.14 & 7.22 ..............................................................

32

 

6.4.5 Diagnostic Menu for Software Version 7.23 .........................................................................

34

7

SERVICING PROCEDURES............................................................................................................

35

7.1

GENERAL CONSIDERATIONS ................................................................................................................

35

7.2

DISASSEMBLY .....................................................................................................................................

35

 

7.2.1

Opening the case..................................................................................................................

35

 

7.2.2

Replacing Fuses ...................................................................................................................

36

 

7.2.3 Replacement of Printed Circuit Boards (PCBs) ....................................................................

37

 

7.2.4

Replacement of Transformer ................................................................................................

38

 

7.2.5 Servicing the Heater Plate ....................................................................................................

38

 

7.2.6

Installing New Software.........................................................................................................

42

 

7.2.7 Replacing the Mains Cable ...................................................................................................

43

 

7.2.8

Closing the case....................................................................................................................

43

8

PERFORMANCE TESTING .............................................................................................................

44

8.1

HUMIDIFIER PERFORMANCE TESTING ...................................................................................................

44

 

8.1.1 Entering the Service Menu....................................................................................................

44

 

8.1.2

Humidifier Calibration Check ................................................................................................

44

 

8.1.3

Humidifier Display Test .........................................................................................................

45

 

8.1.4 Humidifier Voltage Calibration Check ...................................................................................

46

 

8.1.5 Humidifier Warm-upand Control Check ...............................................................................

46

8.2

PROBE ACCURACY CHECK...................................................................................................................

47

 

8.2.1 Probe Temperature Accuracy Test .......................................................................................

47

 

8.2.2 Probe Flow Accuracy Test ....................................................................................................

47

9

RECOMMENDED MAINTENANCE CHECKLIST............................................................................

49

9.1

HUMIDIFIER CHECK (ANNUALLY) ..........................................................................................................

49

9.2

PROBE CHECK (EVERY SIX MONTHS)....................................................................................................

49

10

SPARE PARTS.................................................................................................................................

51

11

CALIBRATION PROBE ...................................................................................................................

55

12

SERIAL PORT & LOGGING SOFTWARE ......................................................................................

56

12.1

INTRODUCTION...............................................................................................................................

56

12.2

INSTALLATION.................................................................................................................................

56

12.3

OPERATING INSTRUCTIONS .........................................................................................................

56

 

12.3.1 Viewing Humidifier Data........................................................................................................

56

 

12.3.2 Logging Humidifier Data to File.............................................................................................

57

13

EMC INFORMATION........................................................................................................................

58

14

PRODUCT CHANGE HISTORY.......................................................................................................

60

4 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

Revision

Description of Technical Manual Change

Date Issued

 

A

First release technical manual.

12 Jan. 1999

 

 

Covers Revision A PCB’sONLY.

 

 

B

Second release technical manual.

6 May 1999

 

 

Covers Revision C and later PCB’sONLY.

 

 

C

Add “View850” Software Instructions

1 Mar. 2000

 

 

 

 

 

D

Neonatal volume ventilation capability.

15 May 2001

 

 

3.4 Performance

 

 

 

4.1.2 Power Up sequence.

 

 

 

4.1.3 Manual Temperature Compensation (TC).

 

 

 

5.3 Cleaning Instructions

 

 

 

Appendix E – Product Change History.

 

 

E

Covers release of software version 6.00.

1 November 2001

 

 

3.4 Performance

 

 

 

Recommended Operating Temperature: 15 to 26ºC

 

 

 

4.1.1 Stand-by.

 

 

 

Changed stand-bypower limits.

 

 

 

4.1.3 Humidity Compensation (HC) mode.

 

 

 

Auto HC mode option.

 

 

 

4.2 Humidifier Controls

 

 

 

Power button must be held for 1 second to switch OFF.

 

 

 

4.4 Setup Indicators

 

 

 

Two LED’s now indicate heater wire connect alarm.

 

 

 

4.5 Operational Alarms

 

 

 

Low temperature alarm enabled during stand-by.

 

 

 

6.4 Diagnostic Menu

 

 

 

“OFF” Offset removed from diagnostic menu.

 

 

 

 

 

 

F

Covers release of software version 7.00.

2 April 2002

 

 

3.4 Performance

 

 

 

Recommended Operating Temperature: 18 to 26ºC

 

 

 

4.1.3 Humidity Compensation (HC) mode

 

 

 

Changed step size to 1 °C in non-invasivemode

 

 

 

4.1.4 Breathing Circuit Recognition added

 

 

 

6.3 See – Manual, Error Codes

 

 

 

removed redundant error code “E33”

 

 

 

6.4 Diagnostic Menu

 

 

 

add new functions “CHP” and “Cct”

 

 

 

 

 

 

G

Technical manual now covers software versions 5.45, 5.70, 6.00, 7.00

1 May 2003

 

 

and 7.14

 

 

 

The following sections have been modified: 3.3, 4.1.3, 4.1.5, 4.4, 5.3,

 

 

 

6.4, 7.2.3, 7.2.6, Appendix E

 

 

 

 

 

 

H

Added Non-HeaterWire Mode in sections 3.0, 4.0, 6.0, and updated

1 July 2004

 

 

Product Change History

 

 

I

8.1.2 Humidifier Calibration Check – Equipment Required

1 August 2005

 

 

Removed the reference to the service kit

 

 

 

10 Spare Parts

 

 

 

Added parts 17 to 22.

 

 

 

12.1 Introduction

 

 

 

Updated how to get View850 and the serial cable

 

 

 

12.2 Installation

 

 

 

Changed View850 installation from floppy disk to CD

 

 

 

12.3.1 Viewing Humidifier Data

 

 

 

Updated how to run View850 and how to change the com. Port

 

 

 

Add section, 13. EMC Information

 

 

 

 

 

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

5

Revision

Description of Technical Manual Change

Date Issued

J

1.4

Product Application, Add warning to connect humidifier only to a

1 November 2005

 

pure sine wave power source

 

 

5.2

Safety Check, add CAUTION: and NOTE:

 

 

6.3

“See manual” Error codes, Elaborate the fault description

 

 

8.1.5 Humidifier Warm-upand Control Check, Change test flow rate

 

 

from 20±10 SLPM to 10±5 SLPM. Reference test limits to airway and

 

 

chamber set temperatures rather than fixed values.

 

 

8.2.2 Probe Flow Accuracy Test, Change test flow rate from 20±2

 

 

SLPM to 10±1 SLPM. Check flow measurement is now between 5 and

 

 

15 LPM

 

 

10 Spare Parts, add items 23,24,25,26

 

Note:

1.Fisher & Paykel Healthcare have a policy of continued product improvement and reserve the right to change specifications without notice.

2.This Technical Manual covers software version 5.45, 5.70, 6.00, 7.00, 7.14, 7.21, 7.22, 7.23 and PCB Revision C, D and E. Refer to previous revisions of the Technical Manual for earlier software and PCB versions.

6 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

Introduction

1.1About this Manual

This manual is intended for qualified service personnel who will perform maintenance and servicing on the Fisher & Paykel Healthcare MR850 Respiratory Humidifier. This manual covers the product specifications, includes a maintenance schedule, and provides the necessary information required for servicing.

NOTE: Some software may not be available in your country. Refer to your local Fisher & Paykel Healthcare representative for the appropriate software version. Maintenance procedures should be carried out at regular intervals (as recommended in the maintenance schedule), to ensure that the humidifier and its accessories are working correctly.

If a fault should occur with the humidifier, follow the troubleshooting guide (section 6) in order to find the most likely cause. If the unit requires servicing, make sure the servicing procedures are followed in order to prevent damage to the humidifier. After service, or as part of the maintenance schedule, a humidifier performance check should be completed.

Due to the nature of the electronics contained within this humidifier, it is not recommended that the printed circuit boards be serviced at component level. Instead, if the PCBs are found to be malfunctioning, they should be replaced.

1.2

Glossary

 

 

Chamber

Device that allows gas to be to be heated and humidified by passing it

 

 

over heated water.

 

Temperature / Flow

Sensor assembly for measuring temperature and flow of respiratory

 

Probe

 

gases traveling through the breathing circuit. Consists of a chamber

 

 

 

and airway probe.

 

Airway Probe

Sensor assembly for measuring gas temperature at the end of the

 

 

 

inspiratory limb.

 

Chamber Probe

Sensor assembly for measuring gas flow and temperature at the

 

 

 

outlet of the humidification chamber.

 

Thermistor

A temperature sensitive resistor placed inside the chamber and

 

 

 

airway probes.

 

Chamber Set Point

The temperature that the humidifier attempts to maintain at the

 

 

 

chamber probe port.

 

Airway Set Point

The temperature that the humidifier attempts to maintain at the airway

 

 

probe port.

 

Heater Wire Adaptor

Electrical connector between the breathing circuit and the humidifier.

 

Breathing Circuit

Tubing that carries respiratory gases to and from the patient.

 

Dual Heated Breathing

A breathing circuit that is heated by means of heater wires, in both the

Circuit

 

expiratory and inspiratory limbs.

 

Single Heated

A breathing circuit that is heated by means of a heater wire, in only

 

Breathing Circuit

the inspiratory limb.

 

PCB

 

Printed Circuit Board.

 

Heater Wire

Wire inside the breathing circuit which heats the respiratory gases.

 

Inspiratory Limb

The section of the breathing circuit that takes the inspired gases to

 

 

 

the patient.

 

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

7

Expiratory Limb

The section of the breathing circuit that takes the expired gases from

 

the patient.

1.3Definitions

NOTE: A NOTE provides important information or explanation of procedures or conditions which may otherwise be misinterpreted or overlooked.

CAUTION: ACAUTION statement designates the possibility of damage to this or other equipment if a procedure is not followed exactly.

WARNING:

A WARNING statement refers to conditions with a possibility of personal injury if a procedure is not followed exactly.

1.4Product Application

The MR850 is a respiratory humidifier designed for use in hospital intensive care units. It is used to provide optimum humidity to respiratory gases delivered to patients via endotracheal tubes or face masks.

Refer to the Respiratory Humidification Product Catalogue or your local Fisher & Paykel Healthcare representative for a list of approved accessories.

WARNING:

The use of breathing circuits, chambers or other accessories which are not approved by Fisher & Paykel Healthcare may impair performance or compromise safety.

Ensure that Invasive mode is set for patients that have bypassed airways.

Ensure maintenance of grounding integrity by connection to a "hospital grade" receptacle.

Always disconnect supply before servicing.

When mounting a humidifier adjacent to a patient ensure that the humidifier is always securely mounted and positioned lower than the patient.

The operation of high frequency surgical apparatus, shortwave or microwave equipment in the vicinity of the humidifier may adversely affect its function. If this occurs, the humidifier should be removed from the vicinity of such devices.

Ensure that both temperature probe sensors are correctly and securely fitted. Failure to do so may result in gas temperatures in excess of 41 °C being delivered to the patient.

Do not touch the glass tip of the chamber temperature probe during use. Keep black connectors dry at all times.

Visually inspect accessories for damage before use.

Normal operation can not be guaranteed if powered from a source other than a pure sine wave, such as a square wave inverter.

8 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

2

 

Humidifier Symbols

 

 

 

 

 

 

 

 

 

 

Caution: Hot surfaces may

 

 

Power On/Off (stand by)

 

 

 

 

 

 

 

 

 

 

 

 

exceed 85 °C

 

 

 

 

 

 

 

 

 

 

Type BF

 

 

Invasive Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Attention – consult

 

 

Non-invasivemode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

accompanying documents

 

 

 

 

 

 

 

 

 

 

Alternating Current

 

 

Temperature Alarm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Drip proof protection to IPX1

 

 

Serial Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Date of manufacture

 

 

Protective Earth

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year-month

 

 

 

 

 

 

 

 

 

 

C-tickfor EMC

 

 

 

Caution: Electrostatic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sensitive Device

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Do not discard

WEEE collection (EU only)

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

9

3 Specifications

3.1Mechanical

Dimensions:

140 mm x 173 x 135 (without chamber fitted)

Weight:

2.8 kg (without chamber fitted)

 

Approx. 3.1 kg (with chamber fitted, and filled with water)

3.2

Electrical

 

 

 

 

 

 

 

 

MR850 Model Number

 

Supply Voltage

 

Supply Current

MR850Axx

 

230 V~

 

1.0 A Max

MR850Pxx

 

127 V~

 

1.8 A Max

MR850Jxx

 

115 V~

 

2.0 A Max

MR850Gxx

 

100 V~

 

2.4 A Max

Supply Frequency:

50 or 60 Hz, Sine Wave

 

Heater Plate Capacity

150 W at nominal mains voltage

HP Thermal Cutout:

118 ± 6 °C

 

Heater Wire Supply:

22 ± 5 V~, 2.73 A Max, 50 or 60 Hz

Maximum Heater Wire Load:

8.0 Ω.

 

3.3Temperature Range

3.3.1Heater Wire Mode

Invasive Mode:

Chamber Set Point: 35.5 to 37 °C

 

Chamber Set Point: 35.5 to 40 °C (versions 5.33, 5.34, 5.45, 5.70,

 

6.00, 7.00, 7.21).

 

Chamber Set Point: 35.5 to 42 °C (versions 7.14, 7.17 & 7.22).

 

Airway Set Point: 35 to 40 °C

Non-InvasiveMode:

Chamber Set Point: 31 °C

 

Chamber Set Point: 31 to 34 °C (versions 5.33, 5.34, 5.45, 5.70,

 

6.00).

 

Chamber Set Point: 31 to 36 °C (versions 7.00, 7.14, 7.17, 7.21,

 

7.22).

 

Airway Set Point: 28 to 34 °C

3.3.2Non Heater Wire Mode

Invasive Mode:

Airway Set point: 37

°C (chamber temperature limited to 66 °C)

Non-invasiveMode:

Airway Set point: 31

°C (chamber temperature limited to 66 °C)

Display:

Three digit, 14 mm, 7 segment LED

 

Range: 10 to 70 °C

 

Accuracy:

± 0.3 °C (in 25 to 45

°C temperature range)

3.3.3Alarm Parameters

High Temperature Alarm:

Causes an immediate, audible and visible alarm at a displayed

 

 

temperature of 41 °C or if the airway temperature exceeds 43 °C

 

 

(see section 4.3)

Temperature Alarm:

Invasive Mode:

 

 

After 10 minutes @ 29.5 °C causes an audible and visible alarm.

 

 

After 60 minutes @ 34.5 °C causes an audible and visible alarm

 

 

(see section 4.5)

 

 

NOTE: The temperature indicator lights if the displayed

 

 

temperature drops below 35.4 °C, initially providing a temperature

 

 

warning.

10

MR850 Technical Manual

* Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

 

Non-heater wire operation:

 

Invasive Mode: Airway temperature < 29.5 °C causes an audible

 

and visible alarm.

 

Non-invasiveMode: Airway temperature < 26.0 °C causes an

 

audible and visible alarm.

Sound Pressure Level:

Alarms exceed 50 dBA @ 1 m.

3.4Performance

Invasive Mode:

Flow up to 60 LPM, humidity output >33 mg/L

Non-InvasiveMode:

Flow up to 120 LPM, humidity output >10 mg/L

 

NOTE: Performance results with RT100 breathing circuit

Maximum System

20 kPa, gas leakage at max. pressure <100 mL/minute.

Operating Pressure:

 

Warm-uptime:

Less than 30 minutes.

Recommended ambient

18 to 26 °C

temperature range:

 

CAUTION: If operating outside the recommended ambient temperature range, consult your local Fisher & Paykel Healthcare representative or refer section 4.1.5.

3.5Transport and Storage Environmental Conditions

Transport Conditions:

-10to +50 °C

Storage Conditions:

-10to +50 °C

3.6Standards and Approvals

AS/NZS 3200.1.0, CAN/CSA 22.2 No.601.1, UL 60601-1,IEC60601-1,EN60601-1

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

11

4 Operating Modes and Controls

4.1Humidifier Operation

The MR850 humidifier is designed to add heat and moisture to respiratory gases. The gas is passed through a humidification chamber where it is warmed and humidified.

The MR850 has two heating systems. The first is a heater plate, which heats the water contained in the humidification chamber, humidifying the air passing through it. The humidifier monitors the temperature of the gas at the chamber outlet with the chamber probe, and controls the amount of power delivered to the heater plate, in order to maintain the chamber set point. Under normal conditions the gas is heated to 37 °C in the invasive mode, 31 °C for the noninvasive mode.

4.1.1Heater wire operation

Ventilator/Gas Supply

RT100 Breathing Circuit

Temperature Probe

Chamber Probe

Airway Probe

MR290 Chamber

Heater Wire Adapter

MR850 Humidifier

Figure 4.1 Typical Heater Wire Humidifier Setup

Humidified gas from the chamber travels through the inspiratory limb, where its temperature must be maintained in order to prevent the generated humidity from condensing. This is achieved with a heater wire encapsulated within the inspiratory limb. The humidifier maintains the temperature along the inspiratory limb by monitoring the temperature at the airway probe and controlling the power delivered to the heater wire. Under normal conditions the gas is heated to 40 °C in the invasive mode, 34 °C for the non-invasivemode.

An optional, second heater wire, located in the expiratory limb, minimises condensate in this limb.

12 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

4.1.2Non-HeaterWire Operation (Software version 7.23 only)

Ventilator/Gas Supply

RT134 Breathing Circuit

Temperature Probe

Chamber

Probe

Airway Probe

MR290

Chamber

Water trap

MR850 Humidifier

Figure 4.2 Typical Non-HeaterWire Humidifier Setup

In this application the MR850 maintains the airway temperature at the desired set point (invasive 37 °C or non-invasive31 °C) by heating the chamber of water through the heater plate. As the gas cools considerably down the unheated circuit, a water trap circuit must be used to collect the resulting condensate.

Activating Non-HeaterWire Operation

Refer also to the diagnostic menu in section 6.4.

1Turn on the humidifier with NO heated circuit connected, and mute the heater wire alarm.

2Access the diagnostic menu by pressing the mute and mode buttons together for 1 second, the display should show two rows of dashes ‘= = =’. Releasing both buttons will allow the diagnostic menu to cycle automatically.

3Allow the menu to cycle through to “cct” – the circuit identification. Press mute to access this function.

4To enable non-heatedoperation, press both mute and mode buttons simultaneously for 1 second, the humidifier will beep twice and the temperature display will show “nhh”. Release both buttons. The humidifier is now configured fornon-heatedcircuits. This setting will be remembered each time the humidifier is turned on.

Deactivating Non-HeaterWire Operation

The simplest way to de-activatenon heater wire operation is to connect a heated breathing circuit. Alternatively it can bede-activatedthe same way thatnon-heatedcircuit operation was activated (see above).

4.1.3Stand-byOperation

If the humidifier detects a problem with its setup or operation it will alarm. Depending on the severity of the alarm condition, the humidifier will either remove all power from the heating systems, or enter stand-by.The humidifier will also enterstand-byif the gas flow through the breathing circuit has stopped.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

13

Stand-by(Software versions: 5.45 & 5.70)

Heater wire power is set at 30 %.

Control of chamber temperature is attempted, within the following limits:

Heater plate temperature is limited to 60 °C.

Heater plate power is limited to 20 %.

Stand-by(Software version: 6.00 onward)

Heater wire power is set at 15 %.

Control of chamber temperature is attempted, within the following limits:

Heater plate temperature is limited to 50 °C.

Heater plate power is limited to 20 %.

NOTE: The temperature alarm algorithm continues to function instand-by.

4.1.4Power Up Sequence

The purpose of the power up sequence is to perform internal checks on various parts of the humidifier and provide the user with a visual and audible check.

Internal self test sequence:

1.Test presence of heater wire.

2.Test correct operation of heater wire triac.

3.Test correct operation of protection relays.

4.Test integrity of temperature/flow probe.

Visual/Audio test sequence:

1.The temperature display and indicator LEDs turn on.

2.The temperature display is blanked and indicators set to their default.

3.Display shows humidifier model number i.e. 850.

4.Display is blanked.

5.Display shows software version number.

6.Display is blanked and an audio tone of 2100 Hz sounds.

7.Normal display.

4.1.5Humidity Compensation (HC) mode (Software version 6.00 onward, except 7.23)

Normal ambient environments between 18 °C and 26 °C do not affect humidity output of temperature controlled heated humidifiers. However once the ambient temperature increases above 26 °C, and/or the temperature of the incoming gas becomes greater than 32 °C, e.g. due to ventilator heating, then the humidity output maybe reduced.

This can be identified by the lack of beading condensate on the inner walls of the humidification chamber and rectified by modifying the breathing circuit or humidifier settings. Increasing the length of breathing circuit between the ventilator and the humidification chamber will assist in cooling the gas before it enters the chamber and improve humidity output.

If beading condensate does not form, humidity output can be further improved by increasing the humidifier’s chamber set point. This can be achieved by accessing the HC mode (or Tc) in the Diagnostic Menu (see section 6.4) and either manually selecting a level of chamber temperature compensation or letting the automatic mode do it for you.

Automatic Humidity Compensation

When automatic HC mode is selected the humidifier calculates the power required to adequately humidify the gas flow through the chamber. If the minimum power level is not met

14 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

then the chamber set point will automatically be increased in 0.5 °C steps (1 °C steps for noninvasive mode) until the minimum power is achieved. The maximum amount of compensation applied is either 3 or 5 °C depending on the mode and software version (section 6.4 Diagnostic Menu details how compensation is applied for each software version).

If conditions improve and too much power is being applied, then the MR850 will automatically reduce the chamber set temperature.

NOTE: Excessive condensate may form in the breathing circuit if the auto HC function is used with turbine driven ventilators (i.e. ventilators that use room air). It is recommended to switch off the auto HC function in these situations if the condensate becomes excessive.

NOTE: Auto HC function is factory set to enabled on all MR850 models.

Manual Humidity Compensation

For manual HC the level of compensation should be increased until beading condensate is observed on the inner walls of the humidification chamber. It should be noted that if environmental conditions change then it might be necessary to re-adjustthis setting. For example, a fall in room temperature could produce a build up of unwanted condensate in the delivery circuit. A reduction in this setting may stop further build up.

NOTE: The previous manual HC setting is restored when power is applied to the humidifier

Refer to section 6.4 Diagnostic Menu for further information regarding this feature.

Activating/Deactivating Humidity Compensation

Refer also to the diagnostic menu in section 6.4

1.Access the diagnostic menu by pressing the mute and mode buttons together for 1 second, the diagnostic menu is entered, indicated by the display of two rows of dashes ‘= = =’. Releasing both buttons will allow the diagnostic menu to cycle automatically through the menu.

2.The first item is “HC” this is the humidity compensation item, press and hold mute to access this function.

3.The setting may show either ‘0’ or ‘-A-‘to change the setting press both mute and mode buttons simultaneously for 1 second, the humidifier will beep twice and the setting will increase. Release both buttons.

4.To increase again repeat step 3. To decrease the setting press the mute and power buttons for 1 second.

5.To exit the menu, release all buttons, the menu will continue to cycle until ‘end’ is displayed, the menu will automatically exit.

Temperature Display

To alert users during normal operation that either manual or automatic HC mode has been enabled, the decimal point on the temperature display will flash. Each of the two modes can be further identified by the flash rate, where auto HC mode has a slower flash rate than manual HC mode.

Note: The displayed temperature may also be higher than normal indicating (up to 39°C) the amount of compensation present.

4.1.6Breathing Circuit Recognition (Software version 7.00 onward)

Fisher & Paykel Healthcare has developed a range of breathing circuits that offer optimum performance for the type of treatment selected while working within recommended operating conditions. Some of these breathing circuits require a slightly modified controller to optimize performance. To do this the MR850 must first recognize what type of delivery circuit has been

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

15

connected. Breathing circuit recognition is performed via three electrical connections on the heater wire adaptor. Re-configuringthe electrical connection pins on a heated circuit and the way it connects to this adaptor identifies the type of heated circuit. In this way three separate heater wire circuits can be identified by the MR850.

4.2Humidifier Controls

4.2.1Power Button

The humidifier will power on if this button is held down briefly, but must be held for one second to turn the humidifier off.

Note: For software version 5.45, 5.70 the power button need only be pressed briefly to turn off the MR850.

CAUTION: Although the display is not illuminated, the unit may still be energized.Be sure to disconnect power from the MR850 before servicing.

After power-onthe humidifier starts an internal diagnostic routine which checks for possible problems in the humidifier setup. If everything is working correctly, normal control is initiated.

4.2.2Mode Button

When held down for one second, the mode button toggles the humidifier between Non-Invasiveand Invasive mode. The Mode indicator LED shows the user which mode is selected.

Invasive mode is for use with patients whose upper airways have been bypassed by either a tracheostomy or endotracheal tube. In this mode of operation the humidifier attempts to deliver optimal humidity to the patient (37 °C, 100 % RH). This mode is the default mode on power up of the humidifier.

The humidifier normally controls the chamber outlet temperature to 37 °C, and the airway temperature to 40 °C, maintaining a +3 °C temperature gradient along the inspiratory limb1.

If however this temperature gradient is not maintained, the chamber set point is reduced in 0.5 °C steps (minimum setting of 35.5 °C), in order to reduce condensate buildup in the breathing circuit2. If the chamber set point is less than 37 °C and sufficient temperature gradient has been maintained along the inspiratory limb, then the chamber set point is increased back up to 37 °C in 0.5 °C steps.

Non-Invasive mode is suitable only for patients whose natural humidification system (i.e. upper airways) hasnot been bypassed, but are receiving gas via a facemask or similar.

The humidifier normally controls the chamber outlet temperature to 31 °C, and the airway temperature to 34 °C, maintaining a +3 °C temperature gradient along the inspiratory limb1.

1If automatic or manual humidity compensation has been activated then the displayed temperature may be higher than 37 °C (Invasive mode) or 31 °C (Non-Invasivemode).

2The humidity compensation algorithm takes precedence over the condensation control algorithm.

16 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

4.2.3Mute Button

The mute button silences the humidifier's audible alarm. The muted time depends on the alarm condition. In general, alarms will be muted for 2 minutes.

A chamber or airway probe alarm is muted for a longer time, until the humidifier determines whether the probe is in or out. The temperature alarm is treated differently - see section 4.5.

4.3Temperature Display

The front panel shows the lower of the chamber or airway temperatures. This temperature gives an indication of the dew point (in °C) of the gas that is being supplied to the patient. The dew point of a gas is the best indication of both its humidity and energy content. Under normal operation, the displayed temperature will be the chamber temperature, as its control set point is lower. If the temperature is above 70 °C, "Hi" will be displayed. If the temperature is below 10 °C, "Lo" will be displayed. If HC mode has been enabled the decimal point on the temperature display will flash.

4.3.1Showing Chamber and Airway Temperature

Both the chamber and airway temperature can be displayed by pushing and holding the mute button for 1 second. The temperatures are displayed in the following sequence:

1Chamber temperature is displayed until two seconds after the mute button is released. The chamber probe indicator (see section 4.4) will also light to show which temperature is being displayed.

2The display will blank, and then the airway temperature will be displayed until two seconds after the mute button is released. The airway probe indicator will also light (see section 4.4) to show which temperature is being displayed.

3The temperature display will blank again, and revert to normal operation.

4.4Setup Indicators

The MR850 setup indicators, placed on the lower left of the front panel, are intended to aid the user in identifying problems with the incorrect setup of the device and its accessories.

4.4.1Heater wire connector

These indicators light if the heater wire in the breathing circuit has not been connected correctly, or if the heater wire or heater wire adaptor is faulty. An intermittent connection, or excessive current (total current in all limbs > 3.5 A) in the heater wires will also produce this alarm. The humidifier will remove power from the heating systems if this alarm is active.

NOTE: Software versions 5.45 and 5.70 do not light the upper indicator located on the breathing circuit.

NOTE: Software versions 7.22 and 7.23 in non heater wire operation and without a heater wire connected no audible or visual heater wire alarm will be given. Connecting a heated wire circuit will automatically cause the MR850 to default to heater wire operation.

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17

4.4.2Temperature / Flow Probe Connector

This indicator will light if the temperature probe is not correctly plugged in, or the probe used is faulty. The humidifier tests for the following probe fault conditions:

Temperature probe disconnected

Chamber thermistor open or short circuit

Airway thermistor open or short circuit

Flow thermistor open or short circuit (shorted probe test)

One thermistor shorted to another (shorted probe test)

Flow calibration resistor open or short circuit (shorted probe test)

An alarm will be generated if any of the above faults are found, and the humidifier will remove power from all heating systems.

NOTE: the shorted probe tests and flow thermistor tests are only performed onstart-up,or when temperature probe or heater wire alarms are cancelled.

4.4.3Chamber Probe & Airway Probe

These indicators are used to show that either the chamber probe or airway probe is not inserted into the breathing circuit correctly. On start-up,and during rapid changes in temperature, the humidifier tests to see if a probe is in place by cooling and then heating the probe. If the humidifier finds that either probe is not inserted into the breathing circuit, an alarm will be generated and the humidifier will enterstand-by.During this alarm the humidifier will initiate a probe out test periodically, or a test will be initiated immediately after mute has been pressed.

During periods of low or zero gas flow, the airway probe out alarm is disabled. As soon as flow is detected however, an airway probe test is initiated.

NOTE: For software versions 7.22 and 7.23 innon-heaterwire operation, the airway probe out alarm does not function, instead the low temperature of the disconnected probe will activate the temperature alarm (refer section 4.5).

4.4.4Chamber or Airway Probe Alarm with Probe connector alarm

The humidifier checks to see if the temperature probe is faulty by testing for the following conditions:

Chamber temperature has been greater than 50 °C for 20 minutes

Chamber temperature is greater than 80 °C

Airway temperature has been greater than 50 °C for 5 minutes

Airway temperature is greater than 80 °C

If an apparent fault is found, the humidifier will give a temperature / flow probe connector alarm, and also indicate either the chamber or airway probe. The humidifier will stay in stand-byuntil the chamber or airway temperature drops below 50 °C. Once this occurs, a probe test will also be initiated.

18 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

4.4.5Water Out Indicator

This indicates that there is insufficient water in the humidification chamber.

The humidifier measures the amount of power used to obtain the chamber temperature. If a lower than expected amount of power is used, a 'water out' alarm is generated. It may take 15 minutes or longer to generate an alarm especially if there is a disturbance (change in flow).

This alarm can be cancelled by pressing the mute button. If however the water out condition remains, the humidifier will alarm again.

4.5Operational Alarms

These alarms are generated if problems occur with the operation of the humidifier.

4.5.1Temperature Indicator

This alarm will occur if the displayed temperature is too high, or if the delivered temperature (Invasive mode only) has been low for a period of time.

High temperature:

The humidifier will immediately alarm if at any time the displayed temperature exceeds 41 °C, or if the airway temperature exceeds 43 °C. If either of these high temperature alarms occur, the humidifier will immediately shut down the heater wire and heater plate.

Low Temperature:

The low temperature warning (visual only) and alarm (visual and audible) are active only when the humidifier is in Invasive mode. Both are disabled during warm-upconditions. The warning alerts the user that low temperature is being delivered to the patient. The alarm alerts the user that a low level has been delivered to an Invasive patient for too long.

The low temperature warning and alarm operate by monitoring the displayed temperature. If the displayed temperature is below 35.5 °C for 25 seconds, the temperature indicator will light, and act as a warning to the user. If the temperature remains below this level for too long, then a Temperature Alarm is activated. The time taken for the humidifier to alarm is dependent on how far below the 35.5 °C threshold the displayed temperature is. Figure 4.3 shows the relationship between temperature, a temperature warning and the time before a temperature alarm:

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

19

Figure 4.3 Temperature vs Time to Alarm

Pressing mute during a temperature alarm silences the alarm for half the normal time period, if the same temperature is maintained.

The low temperature warning and alarm can be caused by cold or drafty ambient conditions, or can result from using gas flow rates outside the specification of the breathing circuit, chamber or humidifier.

NOTE: The low temperature alarm is disabled instand-byon software version

5.45and 5.70.

4.5.2Non-HeaterWire Operation (Software versions 7.22 & 7.23)

When the airway temperature exceeds 41 °C, the heater plate is shut off, and an immediate visible and audible high temperature alarm is activated.

In invasive mode, the low temperature warning and alarm is identical for the heater wire mode (see above) after warm-up.

In addition the airway temperature must reach 29.5 °C in invasive mode (or 26 °C for non-invasivemode) within 15 minutes, otherwise a visible and audible low temperature alarm will be given, and the heater plate will be switched off. This will occur if the airway probe has not been inserted into the breathing circuit.

After warm-up,if the airway temperature drops below 29.5 °C (or 26 °C noninvasive mode), a visible and audible low temperature alarm will be given, and the heater plate will be switched off.

NOTE: The low temperature alarm will be inactive instand-by.

4.5.3See Manual Indicator

This indicates a serious hardware fault. Please refer to section 6, "Troubleshooting".

20 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

5 Maintenance Procedures

In order to keep your humidifier in good working order, it is necessary to perform maintenance at regular intervals.

5.1Maintenance Schedule

5.1.1 MR850 Humidifier

Annually

a.Check MR850 for physical damage:

Check the mains cable for damage, replace if necessary.

Check the heater plate for deep scratching etc., replace if necessary.

Check the heater wire adaptor for kinks, abrasions and damaged connectors. Check that the plugs couple with the sockets on the humidifier.

b.Carry out a full performance test. This procedure is detailed in section 8.

NOTE: A maintenance check sheet is given in Section 9.

5.1.2 MR850 Temperature Probe

Every Six months

a.Visually check the humidifier probes for physical damage:

Check that the chamber probe's glass thermistor has not been damaged. Replace probe if required.

Inspect the chamber probe's glass thermistor for deposits or foreign material. Clean probe as required.

Check the probe cable for kinks and abrasions etc.

Check that the probe connectors couple with the humidifier sockets.

b.A temperature accuracy check and flow accuracy check should be performed on the MR850 temperature probe as outlined in section 8.2.

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21

5.2Safety Check

The unit should be tested to the current medical electrical standards for in-housetesting for each specific country (example, refer to AS/NZS 3551 for Australia and New Zealand).

CAUTION: Permanent damage to this humidifier will result if the serial port is used as a ground point during electrical safety testing.

NOTE: The correct ground test point location is on the heater plate front underside edge, as shown in Figure 5.1., where the insulating anodizing layer has been removed.

Figure 5.1 Showing the correct location of ground test point on the heater plate

22 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

5.3Cleaning Instructions

5.3.1MR850 Humidifiers

It is recommended that only the following cleaners be used on the MR850 as at the time of revision of this technical manual. The disinfectants in the list below have been tested to ensure that no damage will result to the outer plastic or metal components of the humidifier.

1.Disconnect the humidifier from any electrical outlet.

2.Clean the humidifier with one of the following recommended disinfectants using a damp cloth:

Isopropyl Alcohol

Normal dishwashing detergent

NOTE: Follow the manufacturer’s instructions carefully.

Use the correct dilution of the disinfectant.

DO NOT immerse the humidifier in any liquid.

3. Wipe the humidifier clear of any cleaning residues before use.

5.3.2Temperature Flow Probe

The cleaning methods listed below meet the FDA regulations for these types of devices, and do not affect the integrity or performance of the probe. It is the user’s responsibility to qualify any deviations from these procedures, both for disinfecting efficacy and physical effect on the probe. For advice on other cleaning methods not mentioned here, contact your local Fisher and Paykel Healthcare distributor.

NOTE: Refer also to the disinfection instructions on the instruction sheet for the airway temperature probe, Ref 185042434.

1.Physically clean the probes, removing all visible contaminants.

2.Disinfect the probes with one of the following solutions:

Sporicidin ; Sporox ; Cidex ; Cidex OPA

OR Sterilise the probe using Ethylene Oxide sterilisation at 55 °C (131 °F), 80 kPa, allow at least 15 hours for residual ETO to disperse before use.

NOTE: Follow the manufacturer’s instructions carefully. Use the correct dilution of the disinfectant.

CAUTION: DO NOT immerse the black electrical connector plug in disinfectant.DO NOT autoclave probes.

DO NOT use dishwater detergents or solvents.

3.Wipe the airway temperature probes clear of any cleaning residues before use.

4.Store in clean conditions.

Cidex is a registered trademark of Johnson & Johnson Medical Pty. Ltd. North Ryde, NSW, Australia.Sporicidin is a registered trademark of Sporicidin International Ltd, Rockville, MD 20852, USA.Sporox is a registered trademark of Reckitt & Colman Inc. 1655 Valley Rd. Wayne NJ USA

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23

6 Troubleshooting

6.1Operational Problems

This section deals with faults that cause the humidifier to alarm. This may be caused by incorrect setup, faulty accessories, or a faulty humidifier. Refer below for troubleshooting.

Symptom

Corrective Action

Reference

See manual

Record the displayed error code.

Section 6.3

indicator flashing

 

 

 

with audible alarm

 

 

 

See manual

1.

If “PtS” is displayed on the front panel, then the production

Section 7.2.6

indicator light

 

test mode has been accessed. Check the production test

 

permanently on,

 

button is not depressed or mode set by serial command.

 

without an audible

2.

Humidifier faulty. Replace PCBs.

Section 7.2.3

alarm

 

 

 

 

Water Out indicator

1.

Check that there is sufficient water in the chamber. Refill

 

flashes,

 

 

or replace chamber as necessary. Check that the water

 

accompanied by an

 

bag is not empty, and the delivery tube is not kinked or

 

audible alarm

 

occluded.

 

 

 

2.

Check that the water level in the MR290 chamber is not

 

 

 

 

above the marked line. Replace chamber if the water is

 

 

 

 

above this line.

 

 

 

3.

Check that the gas flow rate is within specification of the

 

 

 

 

humidifier and accessories being used. Adjust as

 

 

 

 

necessary.

 

 

 

4.

Has condensate formed on the chamber probe? Dry

 

 

 

 

Probe and re-insert.

 

 

 

5.

Temperature probe faulty. Complete a temperature and

Section 8.2

 

 

 

flow accuracy test on the probe. Replace probe as

 

 

 

 

required.

 

 

 

6.

Humidifier faulty. Complete a performance test. Service

Section 8

 

 

 

humidifier as required.

 

Chamber Probe

1.

Check that the chamber probe is inserted into the

 

alarm flashes

 

breathing circuit correctly, and that the breathing circuit is

 

accompanied by an

 

set up correctly.

 

audible alarm

2.

Check that there is sufficient water in the chamber. Refill

 

 

 

 

as necessary. Check that the water bag and delivery tube

 

 

 

 

are not kinked or occluded.

 

 

 

3.

Ensure correct chamber is being used (refer Operating

 

 

 

 

Manual)

 

 

 

4.

Check that the gas flow rate is within specification of the

 

 

 

 

humidifier and accessories being used. Adjust as

 

 

 

 

necessary.

 

 

 

5.

Has condensate formed on the chamber probe? Dry

 

 

 

 

probe and re-insert.

 

 

 

6.

Temperature probe or humidifier faulty. Complete

Section 8

 

 

 

performance tests. Replace probe or service humidifier as

 

 

 

 

required.

 

Heater wire

1.

Check that the heater wire adaptor is correctly plugged into

 

connector alarm

 

the humidifier along with the breathing circuit.

 

flashes,

 

 

NOTE: The short lead must connect to the inspiratory limb.

 

accompanied by an

2.

Replace breathing circuit, and re-rest.

 

audible alarm

 

3.

Replace heater wire adaptor, and check for intermittent

 

 

 

 

 

 

 

connections. Re-test.

 

 

 

4.

Humidifier faulty. Replace PCBs.

Section 7.2.3

24

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

Symptom

Corrective Action

Reference

Heater wire alarm

Non-heaterwire mode has been activated, connect a heated

Section 4.1.2

not working

wire circuit or disable this mode via the diagnostic menu.

 

Airway Probe

1.

Check that the airway probe is inserted into the breathing

 

alarm flashes along

 

circuit correctly, the breathing circuit assembled correctly,

 

with an audible

 

and that there is water in the chamber.

 

alarm

2.

Check that the circuit is connected correctly to the

 

 

 

ventilator – gas flow could be reversed through the

 

 

 

humidifier.

 

 

3.

Check that the gas flow rate is within specification of the

Section 3.4

 

 

humidifier and type of accessories being used. Adjust as

 

 

 

necessary.

 

 

4.

Check for excessive condensate build up. Excessively

 

 

 

cold or drafty ambient conditions may cause this alarm to

 

 

 

occur. Ensure there are no strong drafts around the

 

 

 

breathing circuit.

 

 

5.

Complete a probe accuracy check. Replace probe as

Section 8.2

 

 

necessary.

 

 

6.

Humidifier faulty. Replace PCBs.

 

Temperature / Flow

1.

If the Temperature / Flow Probe alarm occurs with

Section 4.4

Probe alarm with

 

chamber or airway indicators also flashing, the

 

airway or chamber

 

temperature probe is faulty.

 

indicators flashing

2.

Complete a probe accuracy check, and replace probe if

Section 8.2

 

 

required.

 

Temperature probe

1.

Is the probe connector correctly plugged into the

 

connector indicator

 

humidifier? Plug in probe as required.

 

flashes,

2.

Check that the circuit is connected correctly to the

 

accompanied by an

 

ventilator – gas flow could be reversed through the

 

audible alarm

 

humidifier.

 

 

3.

Perform a humidifier calibration check.

Section 8.1.2

 

4.

Replace temperature probe and re-test.If the alarm

Section 8.2

 

 

condition disappears, the temperature probe is faulty.

 

 

 

Discard faulty probe.

 

 

5.

Humidifier faulty. Replace PCBs.

Section 7.2.3

Temperature

The humidifier has been unable to maintain temperature over a

 

Indicator flashes,

period of time.

 

with audible alarm,

1.

Gas flow has been disconnected from the humidifier either

 

coupled with a low

 

reconnect gas flow or turn the humidifier off.

 

temperature

2.

Check that the gas flow rate is within specification of the

 

(< 35.5 °C)

 

 

humidifier and accessories being used.

 

displayed

 

 

3.

Check for drafts around the breathing circuit. This can be

 

 

 

 

 

caused by fans or room air conditioning. If this is found to

 

 

 

be the cause, the breathing circuit should be shielded from

 

 

 

the ambient airflow.

 

 

4.

Check that the circuit is connected correctly to the

 

 

 

ventilator – gas flow could be reversed through the

 

 

 

humidifier.

 

WARNING: Never cover the breathing circuit.

5.

Check for excessive condensate pooling in the breathing

 

 

circuit. Drain circuit if necessary.

 

6.

Humidifier or probe faulty? Complete humidifier & probe

Section 8

 

performance test. Replace probe or service humidifier as

 

 

required.

 

7.Check that there is sufficient water in the chamber. Refill as necessary. Check that the water bag and delivery tube are not occluded.

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25

Symptom

Corrective Action

Reference

A low temperature

1.

Make sure the humidifier has had time to warm up and that

 

is shown on the

 

there is sufficient gas flow through the breathing circuit.

 

humidifier’s

 

 

 

2.

The humidifier cannot maintain temperature. If the

Section 4.5

display, with no

 

temperature indicator is also on then an alarm will occur

 

audible alarm

 

eventually.

 

 

3.

Humidifier or probe faulty. Complete humidifier and probe

Section 8

 

 

performance test. Replace probe or service humidifier as

 

 

 

required.

 

High displayed

1.

Flow has recently been changed, allow 30 minutes for

 

temperature, no

 

temperature to stabilise

 

temperature alarm

2.

Manual or automatic humidity compensation is active

Section 4.1.5

Temperature

 

The gas flow rate may have suddenly changed. Monitor

Section 8

indicator flashes,

 

the displayed temperature, if the temperature does not fall

 

with audible alarm,

 

rapidly then remove humidifier from patient, and complete a

 

and a high

 

performance test on the humidifier, and temperature / flow

 

temperature is

 

probe. Replace probe or service humidifier as required.

 

shown.

 

 

 

6.2Technical Problems

Problems that cause the humidifier to malfunction without an audible alarm are discussed in this section.

Symptom

Corrective Action

Reference

See manual

1.

Check that the mains supply is within specification.

 

indicator lit (not

 

Provide adequate mains supply if required.

 

flashing)

2.

If ‘PtS’ is displayed.

Section 6.1

 

3.

Replace PCBs.

Section 7.2.3

Humidifier will not

1.

Humidifier plugged into mains supply?

 

turn on with on/off

2.

Check that the mains supply is within specification.

 

button, and no

 

Provide adequate mains supply if required.

 

indicators are lit

3.

Remove mains power and check the fuses.

Section 7.2.2

 

 

4.

Check continuity of mains power cord. Replace as

Section 7.2.7

 

 

necessary.

 

 

5.

Check the transformer windings are not open circuit.

Section 7.2.4

 

 

Primary Winding: Red wires

 

 

 

Secondary 10v winding: White wires

 

 

 

Secondary 22v winding: Yellow wires

 

 

 

If any windings are open circuit, replace the transformer.

 

 

6.

Replace PCBs.

Section 7.2.3

 

 

 

 

Unit fails

 

Send unit to a Fisher & Paykel Healthcare service

Section 7.2.3

calibration check

 

representative for calibration, or replace PCBs.

 

Probe fails Probe

 

Replace probe.

 

Accuracy Check

 

 

 

Unit fails to reach

1.

If the chamber outlet temperature was low, the heater plate

Section 7.2.5

temperature in

 

element should be checked. Replace element as

 

humidifier control

 

necessary.

 

check. (Section

2.

If the airway temperature was low, replace breathing circuit

 

8.1.4)

 

and re-test.

 

 

3.

Replace PCBs.

Section 7.2.3

 

 

 

 

26 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

6.3“See Manual” Error Codes

The following is an explanation of the error codes that are displayed in conjunction with the See Manual indicator flashing. A code is not displayed if the microprocessor has stopped functioning (see technical problems - section 6.2).

Error

Description of Fault

 

E00

No fault

 

E02

Microprocessor stack overflow

 

 

 

 

E03

RAM fault

 

E04

ROM fault

 

 

 

E05

EEPROM version older than ROM version. Update EEPROM. Refer to Section 7.2.6

E06

EEPROM version newer than ROM version – (old software). Contact Fisher & Paykel

 

Healthcare

 

 

 

 

E07

Model mismatch with software, contact your Fisher & Paykel Healthcare

 

 

representative.

 

 

NOTE: included in software version 7.14 onward, except 7.21.

 

 

 

 

E10

Temperature circuit calibration out of range: Range Amp 0: 25.5 °C

 

E11

Temperature circuit calibration out of range: Range Amp 0: 65.0 °C

 

 

 

 

E12

Temperature circuit calibration out of range: Range Amp 1: 25.5 °C

 

E13

Temperature circuit calibration out of range: Range Amp 1: 34.5 °C

 

E14

Temperature circuit calibration out of range: Range Amp 2: 34.5 °C

 

 

 

 

E15

Temperature circuit calibration out of range: Range Amp 2: 44.6 °C

 

E16

Temperature circuit calibration out of range: Range Amp 3: 65.0 °C

 

 

 

 

E20

Heater wire circuit has malfunctioned, heater can not be energized:

 

 

- Heater plate thermal cutout tripped (section 7.2.5)

 

 

- Heater wire fuse (F2) is open circuit (section 7.2.2)

 

 

- Heater wire triac, or heater wire relay is open circuit

 

 

 

 

E21

Heater wire circuit has malfunctioned, heater either can not be de-energizedor

 

 

monitoring circuit has failed :

 

 

- Heater wire triac has shorted

 

 

- Heater wire sense circuit has failed

 

 

 

 

E23

Heater wire voltage measurement circuit faulty

 

E25

Transistor Q17 is not turning on

 

 

 

 

E26

Transistor Q16 is not turning on

 

E27

The heater wire relay is short circuited

 

 

 

 

E28

Mains voltage measurement is uncalibrated (section 8.1.3)

 

 

 

 

E29

The heater plate thermistor is short circuited

 

E2A

The heater plate thermistor is open circuit

 

 

 

 

E2C

Heater plate element circuit has malfunctioned is not turning on:

 

 

- Element is open circuit

 

 

- Heater plate triac or driver faulty

 

 

- Heater plate relay is faulty

 

 

 

 

E2D

The heater plate element is not turning off. Heater plate triac circuit faulty.

 

E30

Power (on/off) button stuck on

 

 

 

 

E31

Mute button stuck on

 

E32

Mode button stuck on

 

 

 

 

E40

Unit not functional tested at time of manufacture

 

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

27

Error

Description of Fault

E41

Failed the functional test at time of manufacture

E42

Was not stress tested during manufacture

 

 

E43

Failed the stress test during manufacture

E44

Not tested on functional tester 2

 

 

E45

Failed production functional tester 2

E4A

EEPROM write error occurred

 

 

E4B

EEPROM write verify error occurred

E4C

EEPROM read error occurred

 

 

E50

Flow circuitry not functioning

E51

Flow circuitry shorted on

 

 

28 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

6.4Diagnostic Menu

By pressing the mute and mode buttons together for 1 second, the diagnostic menu is entered, indicated by the display of two rows of dashes ‘= = =’. Releasing both buttons will allow the diagnostic menu to cycle automatically through the menu, pausing at each function. Pressing the mute button at this time will display the value behind each function for as long as the mute button is held.

6.4.1Diagnostic Menu for Software Versions 5.45 & 5.70

Display

Description

TC

Temperature Compensation (TC) algorithm

 

‘---‘= 0.0°C of chamber compensation. ( CSP = 37.0 °C)

 

‘Lo ’ = 1.5 °C of chamber compensation. ( CSP = 38.5 °C )

 

‘Hi ’ = 3.0 °C of chamber compensation. ( CSP = 40.0 °C )

 

To change the TC value the press the Mute and Mode buttons together for 1

 

second. The humidifier will confirm the change with a double-beep.

CSP

Chamber set point, in 0.1 °C resolution e.g.: 37.0

Cdc

Chamber Duty Cycle (%)

HP

Heater Plate Temperature (1 °C)

 

 

Flo

Gas Flow Rate (0.1 LPM)

 

“---“= Unknown Flow (flow measurement not started)

 

 

FLr

Gas Flow Rate Range:

 

“---“= Unknown Flow (flow measurement not started)

 

“no” = No flow

 

“Lo” = Low flow, ( < 3 LPM )

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

“Hi”

= High flow, ( > 14 LPM )

 

-“

= Ventilated flow detected

 

 

OFF

Offset temperature difference between the chamber and airway set temperatures

 

(0.1 °C)

ASP

Airway temperature set point (0.1 °C)

Adc

Airway Duty Cycle (%)

LAS

Last Humidifier Alarm State, the display will blank, and the humidifier’s last alarm

 

will be shown on the indicators. To clear LAS, press and hold the mute and mode

 

buttons for 1 second. The humidifier will beep when LAS has been cleared.

LFS

Last Humidifiers Fault State, refer to section 6.3. To clear LFS, press and hold the

 

mute and mode buttons for 1 second. The humidifier will beep when LFS has been

 

cleared.

SoF

Software version

 

 

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will

 

automatically exit after 6 seconds

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

29

6.4.2Diagnostic Menu for Software Version 6.00

Display

Description

HC

Humidity Compensation (HC) algorithm

 

Invasive mode, compensation range is 0.0 to 3.0 °C ( CSP = 37.0 to 40 °C )

 

Non-Invasivemode, compensation range is 0.0 to 5.0 °C ( CSP = 31.0 to 36.0 °C )

 

By pressing the Mute and Mode buttons together for 1 second or pressing the Mute

 

and Power buttons together for 1 second the user can respectively move up or

 

down through the settings listed below. The humidifier will confirm the change with

 

a double-beep.

 

‘5.0’ = +5.0 °C of chamber compensation (Non-Invasivemode only)

 

‘4.0’ = +4.0 °C of chamber compensation (Non-Invasivemode only)

 

‘3.0’ = +3.0 °C of chamber compensation

 

‘2.0’ = +2.0 °C of chamber compensation

 

‘1.0’ = +1.0 °C of chamber compensation

 

‘0.0’ = +0.0 °C of chamber compensation (NO compensation)

 

‘-A-‘= Automatic humidity compensation mode:

 

 

Invasive mode: 0 to 3 °C in 0.5 °C steps

 

 

Non-invasivemode: 0 to 3 °C in 0.5 °C steps

 

 

CSP

Chamber set point, in 0.1 °C resolution eg: 37.0

 

Invasive mode range 35.5 to 40 °C.

 

Non-Invasivemode range 31.0 to 36.0 °C.

Cdc

Chamber Duty Cycle (%)

 

 

HP

Heater Plate Temperature (1 °C)

Flo

Gas Flow Rate (0.1 LPM)

 

“---“= Unknown Flow (flow measurement not started)

FLr

Gas Flow Rate Range:

 

“---“= Unknown Flow (flow measurement not started)

 

“no” = No flow

 

“Lo” = Low flow, ( < 3 LPM )

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

“Hi”

= High flow, ( > 13 LPM )

 

-“

= Ventilated flow detected

ASP

Airway temperature set point (0.1 °C)

 

 

Adc

Airway Duty Cycle (%)

LAS

Last Alarm State, the display will blank, and the humidifier’s last alarm will be shown

 

on the indicators. To clear LAS, press and hold the mute and mode buttons for 1

 

second. The humidifier will beep when LAS has been cleared.

LFS

Last Fault State, refer to section 6.3. To clear LFS, press and hold the mute and

 

mode buttons for 1 second. The humidifier will beep when LFS has been cleared.

SoF

Software version

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will

 

automatically exit after 6 seconds

30 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

6.4.3Diagnostic Menu for Software Version 7.00 & 7.21

Display

Description

 

HC

Humidity Compensation (HC) algorithm

 

 

Invasive mode, compensation range is 0.0 to 3.0 °C ( CSP = 37.0 to 40 °C )

 

 

Non-Invasivemode, compensation range is 0.0 to 5.0 °C ( CSP = 31.0 to 36.0 °C )

 

 

By pressing the Mute and Mode buttons together for 1 second or pressing the Mute

 

and Power buttons together for 1 second the user can respectively move up or

 

 

down through the settings listed below. The humidifier will confirm the change with

 

a double-beep.

 

 

‘5.0’ = +5.0 °C of chamber compensation (Non-Invasivemode only)

 

 

‘4.0’ = +4.0 °C of chamber compensation (Non-Invasivemode only)

 

 

‘3.0’ = +3.0 °C of chamber compensation

 

 

‘2.0’ = +2.0 °C of chamber compensation

 

 

‘1.0’ = +1.0 °C of chamber compensation

 

 

‘0.0’ = +0.0 °C of chamber compensation (No compensation)

 

 

‘-A-‘= Automatic humidity compensation mode:

 

 

 

Invasive mode: 0 to 3 °C in 0.5 °C steps

 

 

 

Non-invasivemode: 0 to 5 °C in 1 °C steps

 

CSP

Chamber set point, in 0.1 °C resolution eg: 37.0

 

 

Invasive mode range 35.5 to 40 °C.

 

 

Non-Invasivemode range 31.0 to 36.0 °C.

 

Cdc

Chamber Duty Cycle (%)

 

CHP

Chamber Power / Flow ratio (W/LPM)

 

 

 

 

hP

Heater Plate Temperature (1 °C)

 

Flo

Gas Flow Rate (0.1 LPM)

 

 

“---“= Unknown Flow (flow measurement not started)

 

FLr

Gas Flow Rate Range:

 

 

“---“= Unknown Flow (flow measurement not started)

 

 

“no” = No flow

 

 

“Lo” = Low flow, ( < 3 LPM )

 

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

 

“Hi”

= High flow, ( > 13 LPM )

 

 

-“

= Ventilated flow detected

 

ASP

Airway temperature set point (0.1 °C)

 

 

 

 

Adc

Airway Duty Cycle (%)

 

Cct

Connected Circuit heater identification:

 

 

“S“ = Standard inspiratory heater connected

 

 

“C” = Coaxial inspiratory heater connected

 

 

“E” = Expiratory heater connected

 

 

“---”= No heaters connected

 

LAS

Last Alarm State, the display will blank, and the humidifier’s last alarm will be shown

 

on the indicators. To clear LAS, press and hold the mute and mode buttons for 1

 

 

second. The humidifier will beep when LAS has been cleared.

 

LFS

Last Fault State, refer to section 6.3. To clear LFS, press and hold the mute and

 

 

mode buttons for 1 second. The humidifier will beep when LFS has been cleared.

 

SoF

Software version

 

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will

 

 

automatically exit after 6 seconds

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

31

6.4.4Diagnostic Menu for Software Version 7.14

Display

Description

HC

Humidity Compensation (HC) algorithm

 

Note: HC is inactive while operating undernon-heaterwire control.

 

Invasive mode, compensation range is 0.0 to 5.0 °C ( CSP = 37.0 to 42 °C )

 

Non-Invasivemode, compensation range is 0.0 to 5.0 °C ( CSP = 31.0 to 36.0 °C )

 

By pressing the Mute and Mode buttons together for 1 second or pressing the Mute and Power buttons

 

together for 1 second the user can respectively move up or down through the settings listed below. The

 

humidifier will confirm the change with a double-beep.

 

‘5.0’ = +5.0 °C of chamber compensation

 

‘4.0’ = +4.0 °C of chamber compensation

 

‘3.0’ = +3.0 °C of chamber compensation

 

‘2.0’ = +2.0 °C of chamber compensation

 

‘1.0’ = +1.0 °C of chamber compensation

 

‘0.0’ = +0.0 °C of chamber compensation (NO compensation)

 

‘-A-‘= Automatic humidity compensation mode:

 

 

Invasive mode: 0 to 5 °C in 0.5 °C steps

 

 

Non-invasivemode: 0 to 5 °C in 1 °C steps

 

 

Cct

Connected breathing circuit identification:

 

“S“ = Standard inspiratory heater connected

 

“C” = Coaxial inspiratory heater connected

 

“E” = Expiratory heater connected

 

“---”= No heaters detected while under heater wire control

CSP

Chamber set point, in 0.1 °C resolution eg: 37.0

 

Invasive mode range 35.5 to 42 °C.

 

Non-Invasivemode range 31.0 to 36.0 °C.

 

 

Cdc

Chamber Duty Cycle (%)

 

During selection of this menu and while a chamber probe out test is active the chamber probe indicator will

 

light.

 

CHP

Chamber Power / Flow ratio (W/LPM)

hP

Heater Plate Temperature (1 °C)

 

 

Flo

Gas Flow Rate (0.1 LPM)

 

“---“= Unknown Flow (flow measurement not started)

 

 

FLr

Gas Flow Rate Range:

 

“---“= Unknown Flow (flow measurement not started)

 

“no” = No flow, ( Stand-by)

 

“Lo” = Low flow, ( < 3 LPM )

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

“Hi”

= High flow, ( > 13 LPM )

 

-“

= Ventilated flow detected

ASP

Airway temperature set point (0.1 °C)

 

 

Adc

Airway Duty Cycle (%)

 

During selection of this menu and while an airway probe out test is active the airway probe indicator will light.

 

 

H2O

Water out number, used to detect the presence of chamber water, calculated from, chamber power / (heater

 

plate temp. – chamber temp.).

 

During selection of this menu and while the water out number falls below a dry chamber threshold the water

 

out indicator will light.

LAS

Last Alarm State, the display will blank, and the humidifier’s last alarm will be shown on the indicators. To

 

clear LAS, press and hold the mute and mode buttons for 1 second. The humidifier will beep when LAS has

 

been cleared.

LFS

Last Fault State, refer to section 6.3. To clear LFS, press and hold the mute and mode buttons for 1 second.

 

The humidifier will beep when LFS has been cleared.

SoF

Software version

 

 

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will automatically exit after 6

 

seconds.

32 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

6.4.5Diagnostic Menu for Software Version 7.22

Display

Description

 

 

HC

Humidity Compensation (HC) algorithm

 

 

 

Note: HC is inactive while operating undernon-heaterwire control.

 

 

Invasive mode, compensation range is 0.0 to 5.0 °C ( CSP = 37.0 to 42 °C )

 

 

Non-Invasivemode, compensation range is 0.0 to 5.0 °C ( CSP = 31.0 to 36.0 °C )

 

 

By pressing the Mute and Mode buttons together for 1 second or pressing the Mute and Power buttons

 

 

together for 1 second the user can respectively move up or down through the settings listed below. The

 

 

humidifier will confirm the change with a double-beep.

 

 

‘5.0’ = +5.0 °C of chamber compensation

 

 

 

‘4.0’ = +4.0 °C of chamber compensation

 

 

 

‘3.0’ = +3.0 °C of chamber compensation

 

 

 

‘2.0’ = +2.0 °C of chamber compensation

 

 

 

‘1.0’ = +1.0 °C of chamber compensation

 

 

 

‘0.0’ = +0.0 °C of chamber compensation (NO compensation)

 

 

‘-A-‘= Automatic humidity compensation mode:

Invasive mode: 0 to 5 °C in 0.5 °C steps

 

 

 

 

Non-invasivemode: 0 to 5 °C in 1 °C steps

 

 

 

 

 

Cct

Connected breathing circuit identification:

 

 

 

“S“ = Standard inspiratory heater connected

 

 

 

“C” = Coaxial inspiratory heater connected

 

 

 

“E” = Expiratory heater connected

 

 

 

“---”= No heaters detected while under heater wire control

 

 

Non-HeaterWire Operation

 

 

 

To enable non heater wire operation, press and hold both the mute and mode buttons simultaneously for 1

 

 

second. The display will show ‘nhh’ and the humidifier will confirm with an audible beep. Ensure that no

 

 

heated breathing circuit is connected to the humidifier otherwise the humidifier won’t change operation.

 

 

To disable non-heaterwire mode, repeat the above process or connect a heater breathing circuit.

 

CSP

Chamber set point, in 0.1 °C resolution eg: 37.0

 

 

 

Invasive mode range 35.5 to 42 °C.

 

 

 

Non-Invasivemode range 31.0 to 36.0 °C.

 

 

 

 

 

 

Cdc

Chamber Duty Cycle (%)

 

 

 

During selection of this menu and while a chamber probe out test is active the chamber probe indicator will

 

 

light.

 

 

 

CHP

Chamber Power / Flow ratio (W/LPM)

 

 

hP

Heater Plate Temperature (1 °C)

 

 

 

 

 

 

Flo

Gas Flow Rate (0.1 LPM)

 

 

 

“---“= Unknown Flow (flow measurement not started)

 

 

 

 

 

FLr

Gas Flow Rate Range:

 

 

 

“---“= Unknown Flow (flow measurement not started)

 

 

“no” = No flow, ( Stand-by)

 

 

 

“Lo” = Low flow, ( < 3 LPM )

 

 

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

 

 

“Hi”

= High flow, ( > 13 LPM )

 

 

 

-“

= Ventilated flow detected

 

 

ASP

Airway temperature set point (0.1 °C)

 

 

 

 

 

 

Adc

Airway Duty Cycle (%)

 

 

 

During selection of this menu and while an airway probe out test is active the airway probe indicator will light.

 

 

H2O

Water out number, used to detect the presence of chamber water, calculated from, chamber power / (heater

 

plate temp. – chamber temp.).

 

 

 

During selection of this menu and while the water out number falls below a dry chamber threshold the water

 

out indicator will light.

 

 

LAS

Last Alarm State, the display will blank, and the humidifier’s last alarm will be shown on the indicators. To

 

 

clear LAS, press and hold the mute and mode buttons for 1 second. The humidifier will beep when LAS has

 

been cleared.

 

 

LFS

Last Fault State, refer to section 6.3. To clear LFS, press and hold the mute and mode buttons for 1 second.

 

The humidifier will beep when LFS has been cleared.

 

SoF

Software version

 

 

 

 

 

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will automatically exit after 6

 

 

seconds.

 

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

33

6.4.6Diagnostic Menu for Software Version 7.23

Display

Description

Cct

Connected breathing circuit identification:

 

“S“ = Standard inspiratory heater connected

 

“C” = Coaxial inspiratory heater connected

 

“E” = Expiratory heater connected

 

“---”= No heaters detected while under heater wire control

 

Non-HeaterWire Operation

 

To enable non heater wire operation, press and hold both the mute and mode

 

buttons simultaneously for 1 second. The display will show ‘nhh’ and the humidifier

 

will confirm with an audible beep. Ensure that no heated breathing circuit is

 

connected to the humidifier otherwise the humidifier won’t change operation.

 

To disable non-heaterwire mode, repeat the above process or connect a heater

 

breathing circuit.

CSP

Chamber set point, in 0.1 °C resolution eg: 37.0

 

Invasive mode: range 35.5 to 42 °C.

 

Non-Invasivemode: range 31.0 to 36.0 °C.

 

 

Cdc

Chamber Duty Cycle (%)

 

During selection of this menu and while a chamber probe out test is active the

 

chamber probe indicator will light.

CHP

Chamber Power / Flow ratio (W/LPM)

hP

Heater Plate Temperature (1 °C)

 

 

Flo

Gas Flow Rate (0.1 LPM)

 

“---“= Unknown Flow (flow measurement not started)

 

 

FLr

Gas Flow Rate Range:

 

“---“= Unknown Flow (flow measurement not started)

 

“no” = No flow, ( Stand-by)

 

“Lo” = Low flow, ( < 3 LPM )

 

“In”

= Intermediate flow, ( 2 to 17 LPM )

 

“Hi”

= High flow, ( > 13 LPM )

 

-“

= Ventilated flow detected

ASP

Airway temperature set point (0.1 °C)

Adc

Airway Duty Cycle (%)

 

During selection of this menu and while an airway probe out test is active the airway

 

probe indicator will light.

H2O

Water out number, used to detect the presence of chamber water, calculated from,

 

chamber power / (heater plate temp. – chamber temp.).

 

During selection of this menu the water out indicator will light if the water out

 

number falls below a dry chamber threshold.

LAS

Last Alarm State, the display will blank, and the humidifier’s last alarm will be shown

 

on the indicators. To clear LAS, press and hold the mute and mode buttons for 1

 

second. The humidifier will beep when LAS has been cleared.

LFS

Last Fault State, refer to section 6.3. To clear LFS, press and hold the mute and

 

mode buttons for 1 second. The humidifier will beep when LFS has been cleared.

SoF

Software version

End

Press the mute button to cycle to the start of the menu, or the diagnostic menu will

 

automatically exit after 6 seconds.

34 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

7 Servicing Procedures

7.1General Considerations

WARNING:

Although the MR850 display may not be illuminated, the unit may still be energized. Be sure to disconnect the MR850 from the power supply before servicing.

All servicing procedures should be followed by a humidifier performance test, and an electrical safety test to ensure proper operation. The performance tests are outlined in section 8.

CAUTION:

Where screws and bolts have been removed from the product, do not use excessive force when re-fastening.

Antistatic procedures should be followed when servicing this product.

7.2Disassembly

7.2.1Opening the case

1.Ensure mains power is disconnected from the unit.

2.Remove the four screws at the back of the humidifier.

Separate the case by sliding the two halves apart. Pull the front half of the case away from the rear (Figure 7.1). The control PCB is attached to the front half of the case and is connected via ribbon cable to the power PCB fitted to the rear half of the case.

Figure 7.1 Case separation

3.Slide the power PCB forward with the side panel (the side panel is attached to the power PCB). The side panel will need to be pushed inwards during this action in order to unlatch and clear the electrical connectors.

4.Un-clipthe three fasteners (Figure 7.2) which hold the front (control) PCB to the front of the case, and separate the front PCB from the case.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

35

Figure 7.2 Showing PCB fasteners

7.2.2Replacing Fuses

1.Open the case (section 7.2.1).

2.The fuses can now be accessed. See Figure 7.3 for the location of the fuses on the power PCB.

Figure 7.3 Showing location of the fuses on power PCB

The four fuses have the following ratings:

MR850 Model Number

Supply Voltage

Fuse Type

Part Number

MR850Axx

230 V~

F1: 1 A 250 V FastBlow

999 830 001

 

 

F2: 4 A 125 V FastBlow

999 830 017

 

 

F3: 2 A 250 V FastBlow

999 830 009

 

 

F4: 2 A 250 V FastBlow

999 830 009

MR850Pxx

127 V~

F1: 1 A 250 V FastBlow

999 830 001

 

 

F2: 4 A 125 V FastBlow

999 830 017

 

 

F3: 3 A 250 V FastBlow

999 830 012

 

 

F4: 3 A 250 V FastBlow

999 830 012

36 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

MR850 Model Number

Supply Voltage

Fuse Type

Part Number

MR850Jxx

115 V~

F1: 1 A 250 V FastBlow

999 830 001

 

 

F2: 4 A 125 V FastBlow

999 830 017

 

 

F3: 3 A 250 V FastBlow

999 830 012

 

 

F4: 3 A 250 V FastBlow

999 830 012

MR850Gxx

100 V~

F1: 1 A 250 V FastBlow

999 830 001

 

 

F2: 4 A 125 V FastBlow

999 830 017

 

 

F3: 3 A 250 V FastBlow

999 830 012

 

 

F4: 3 A 250 V FastBlow

999 830 012

WARNING:

Be sure to replace the fuse with the correct rating and type. Do not under any circumstances replace F2 with anything other than a fast blow fuse of the type and rating specified, as serious injury could result.

3.Replace fuse.

4.Close the case (section 7.2.8).

7.2.3Replacement of Printed Circuit Boards (PCBs)

1.Open the case (section 7.2.1).

2.Disconnect all harnesses attached to the power PCB. Disconnect the mains and protective earth wires by unscrewing the terminal blocks, and cutting the cable ties (Figure 7.4).

3.Remove PCBs, and using an appropriate tool, remove the ROM from the 32-pinsocket on the control PCB. Store the ROM in an antistatic bag or box.

4.Unpack replacement PCBs, install the ROM from the previous PCB.

5.Replace the mains fuses (F3, F4) with the correct type, and attach mains and protective earth wires, using the cable ties provided (Figure 7.4).

6.NOTE: If revision A PCBs are being replaced with revision C PCBs or later, (look for identification on the control board), then the wiring of the heater plate thermal cutout (and thermistor) will need to be changed.Un-clipthe four pins from the connector by using a small flat bladed screwdriver.Re-wirethe connector so the thermistor wires (white) are located on the inner two pins, and the thermal cutout wires (black) are located on the two outer pins.

7.Connect harnesses from the transformer and heater plate to the power PCB.

8.Close the case (section 7.2.8).

9.Update the EEPROM software version (step 5, section 7.2.6).

10.Check that the humidifier powers up normally, and complete a full performance test (section 8).

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37

Figure 7.4 Showing Humidifier Power PCB wiring

7.2.4Replacement of Transformer

1.Open the case (section 7.2.1).

2.Disconnect the transformer primary and secondary harnesses attached to the power PCB.

3.Unscrew the four mounting screws fixing the transformer, and remove the transformer from the case.

4.Place the new transformer inside the case, and mount using the four screws.

5.Connect transformer primary and secondary harnesses to the power PCB.

6.Close the case (section 7.2.8).

7.2.5Servicing the Heater Plate Resetting the thermal cutout.

1.Open the case (section 7.2.1).

2.Check the thermal cutout on the heater plate by pushing the red button with a pen or small screwdriver - see Figure 7.5.

Figure 7.5 Showing location of thermal cutout

38 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

3.If the thermal cutout "clicks" when pushed, it has been previously activated, and is now reset. NOTE: If the heater plate is still hot, it must be allowed to cool sufficiently before the thermal cutout will reset.

4.Close the case (section 7.2.8).

Replacing the heater plate thermistor

NOTE: A Heater plate thermistor service kit is required. (Part Number: 043 041 254)

1.Open the case (section 7.2.1).

2.Disconnect the heater plate element, thermistor and thermal cutout harnesses attached to the power PCB.

3.Remove the three screws holding the heater plate - see Figure 7.6.

4.Cut cable ties attached to the heater plate harnesses.

Figure 7.6 Showing location of Heater Plate screws

5.Remove screw holding heater plate thermistor - see Figure 7.7.

6.Unsolder the wires attached to the thermal cutout, and remove the old thermistor and harness.

7.Place the new thermistor into position, and attach using the screw.

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39

Figure 7.7 Showing location of Heater Plate Thermistor

Thermal Cutout and Element Screws

8.Solder the wires from the new harness to the heater plate thermal cutout.

9.Attach the cable ties provided to the heater plate harness.

10.Place heater plate back into position, ensuring the springs underneath the heater plate are in place. Attach to the humidifier's case using the three long screws that were previously removed.

11.Connect the heater plate element, thermistor and thermal cutout harnesses to the power PCB.

12.Close the case (section 7.2.8).

Checking the heater plate element

1.Open the case (section 7.2.1).

2.Disconnect the heater plate element, thermistor and thermal cutout harnesses from the power PCB.

3.Measure the resistance between the 2 contacts on the heater plate element connector (this is the large three pin connector).

The resistance of the heater plate element should measure the same as outlined in the table below:

MR850 Model Number

Supply Voltage

Heater Plate Resistance

MR850Axx

230 V~

353

± 12 Ohms

MR850Pxx

127 V~

108 ± 3 Ohms

MR850Jxx

115 V~

88

± 3 Ohms

MR850Gxx

100 V~

67

± 2 Ohms

If the measured resistance is outside this range, replace the heater plate element (steps 4 to 9). If the heater plate element is within specification, go to step 10.

NOTE: If the heater plate element requires replacing, a heater plate element service kit is required - see Section 10. Spare Parts.

4.Remove the two visible screws holding the heater plate element reflector. Remove the shield, making sure the washers are not lost. Unscrew the last four screws on the element cover (Figure 7.7).

40 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

5.Remove the heater element, leaving the mica insulator in place.

6.Insert the new element into position, making sure the insulating mica is between the element and the heater plate.

7.Replace the element cover, using the four screws that were previously removed.

8.Replace the element reflector, making sure the washers that separate the reflector from the cover are placed back into position. Screw into place.

9.Place the heater plate assembly back into position, ensuring the springs underneath the heater plate are in place. Attach to the humidifier case using the three long screws that were previously removed.

10.Connect the heater plate element, thermistor and thermal cutout harnesses to the power PCB.

11.Close the case (section 7.2.8).

Replacing the Thermal Cutout

1.Open the case (section 7.2.1).

2.Disconnect the heater plate element, thermistor and thermal cutout harnesses from the power PCB.

3.Remove the three screws holding the heater plate - see Figure 7.7.

4.Un-solderthe two black wires attached to the thermal cutout.

5.Unscrew fasteners used to secure the thermal cutout, and remove.

6.Place new thermal cutout in position and fasten using screws provided.

7.Depress the thermal cutout's red button to ensure it is reset.

8.Solder the black wires that were previously disconnected to the contacts on the new thermal cutout.

9.Place heater plate back into position, ensuring the springs underneath the heater plate are in place. Attach to the humidifier's case using the three long screws that were previously removed.

10.Connect the heater plate element, thermistor and thermal cutout harnesses to the power PCB.

11.Close the case (section 7.2.8).

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7.2.6Installing New Software

NOTE: A software upgrade kit is required.

Some software may not be available in your country. Refer to your local Fisher & Paykel Healthcare representative for the appropriate part number:

 

Single ROM pack

32 ROM Pack

GJU model

043042459

043042461

JHU model

043042458

043042460

All other models

043042066

043041255

Figure 7.8 Showing location of U3

1.Open the case (section 7.2.1).

2.Remove ROM integrated circuit U3 (Figure 7.8) using appropriate tools.

3.Place new ROM into the empty socket, ensuring correct orientation.

4.Close the case (section 7.2.8)

5.Turn the humidifier upside down; use a non conducting tool to hold the production test button down. This button is accessible through the right air vent slot (when looking at the rear of the humidifier). See Figure 7.9.

WARNING:

Never use an electrically conducting tool to depress the production test button, as there are live mains voltages inside the humidifier.

Figure 7.9 Showing Location of the Production Test Button

42 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

6.Apply mains power to the humidifier, while keeping the production test button depressed. The display should read: “PTS”. This ensures that the new software version number will be properly updated in the EEPROM.

7.Turn off the mains power to the humidifier, and remove the tool.

8.Check that the humidifier powers up normally, and complete a full performance test (section 8).

(An alternative method for software versions 7.21 onward.)

1.Perform steps 1 to 4 as above.

2.Apply mains power to the humidifier. An error code E05 (EEPROM version is older than the ROM version) or E06 (EEPROM version is newer than the ROM version) will be given. Press the Mute button to confirm that the software is to be changed to the version in the ROM. Once the Mute button is pressed the software version is changed and the MR850 is automatically restarted.

3.Complete a full performance test (section 8).

7.2.7Replacing the Mains Cable

1.Open the case (section 7.2.1).

2.Unscrew the three mains cable wires from the terminal blocks on the power PCB (see Figure 7.4), and cut the cable tie on the PCB.

3.Slide the mains cable retainer away from the rear of the case.

4.Replace the power cord, and affix to the case by forcefully pushing the retainer back into position (towards the rear of the case).

5.Attach the 3 mains cable wires to the terminal blocks on the power PCB (see table below for correct mains cable wiring), and attach the phase and neutral wires with a new cable tie.

CORD TYPE

PHASE

NEUTRAL

EARTH

USA / JAPAN

Black

White

Green

(115 / 100 V~)

or Brown

or Blue

or Green/Yellow

EUROPEAN / IEC

Brown

Blue

Green / Yellow

(230/ 127 V~)

 

 

 

NZ / AUSTRALIA

Brown

Blue

Green / Yellow

(230 V~)

 

 

 

WARNING:

When attaching the mains cable wires, ensure that the correct polarity of the mains wiring is followed. The table given above only applies to power cords supplied by Fisher

&Paykel Healthcare.

6.Close the case (section 7.2.8).

7.2.8Closing the case

1.Make sure that all harnesses that were previously disconnected have been reconnected. If the mains wiring was disconnected during servicing, check that the mains polarity is correct (see table in section 7.2.7).

2.Slide the power PCB back into position, ensuring that the side panel slides in the slots and latches into the case rear.

3.Place the control PCB back into position in the front of the case, ensuring all clips are located properly.

4.Slide the case together, and replace the four screws.

5.In order to check that the humidifier is working properly, complete a full performance test as outlined in section 8.

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43

8 Performance Testing

This section discusses the performance testing of the MR850 humidifier and also the MR850 temperature / flow probe. Performance testing is required as part of ongoing maintenance or after servicing of the humidifier has been completed.

8.1Humidifier Performance Testing

If the humidifier has been operating normally, but a performance check is required as part of the maintenance schedule, it is recommended that the following tests are completed:

1.A humidifier Calibration Check (Section 8.1.2)

2.A humidifier Display Check (Section 8.1.3)

However, if there is a problem with the humidifier, or if the humidifier has recently been serviced, then the following tests should be completed in addition to those outlined above.

3.A humidifier Voltage Calibration Check (only required if the MR850's PCBs or mains transformer have been serviced or replaced). (Section 8.1.4)

4.A humidifier Warm-upand Control Check. (Section 8.1.5)

8.1.1Entering the Service Menu

The MR850 humidifier has a special mode which enables the operator to verify correct operation. To enter this mode, hold down the power button on the front of the humidifier then apply mains power. The See-Manualindicator will light, and the humidifier will enter the service menu. The service menu has six different tests:

Display

Description

Reference

-1-

Calibration Probe #1 Check

Section 8.1.2

-2-

Calibration Probe #2 Check

Section 8.1.2

-3-

Voltage Calibration Check

Section 8.1.4

-4-

Temperature Probe Check

Section 8.2.1

-5-

Flow Check

Section 8.2.2

-6-

Display Test

Section 8.1.3

End

Service Menu Exit

 

Pushing the mute button while a number is displayed enters the relevant service test. When 'End' is displayed the user can press the mute button to cycle back to the start of the service menu. If no button is pushed, the service menu will automatically exit after six seconds.

NOTE: All tests performed in the service menu will automatically exit after 30 minutes.

8.1.2Humidifier Calibration Check

This section describes how to check the accuracy of the humidifier's temperature and flow measurement electronics.

Equipment Required:

MR850 Humidifier

Reference Probe Set, Fisher & Paykel Healthcare part number: 900MR870

44 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

1.Hold down the power button, then apply mains power to the humidifier. This action places the humidifier into service mode.

2.Select service mode number 1 (Calibration Probe #1 Check) by pushing the mute button when '-1-'is displayed.

3.Insert the calibration probe with the GREY collet into the temperature / flow probe socket of the humidifier.

4.Allow the display to stabilize for a few seconds, and check the number shown on the humidifier display. The table below shows the numbers displayed by the humidifier in this mode:

TEST

PASS

FAIL (LOW)

FAIL (HIGH)

Airway Temperature

100

101

102

Chamber Temperature

100

104

108

Flow Temperature

100

110

120

Calibration Resistor

100

140

180

Overheat

Heater Wire

Heater Wire

Heater Wire

 

LED OFF

LED ON

LED ON

If the humidifier displays any other value than '100' or if the heater wire indicator is on, check that you have the correct calibration probe plugged in, otherwise the MR850 PCBs are faulty and they will need to be serviced or replaced (refer 7.2.3).

5.Press the power button (this causes the Calibration Probe #2 Check to be executed).

6.Insert the calibration probe with a BLUE collet into the temperature / flow probe socket of the humidifier.

7.Allow the displayed value to stabilize for a few seconds. Check the humidifier display. The table below shows the numbers displayed by the humidifier in this mode:

TEST

PASS

FAIL (LOW)

FAIL (HIGH)

Airway Temperature

200

201

202

Chamber Temperature

200

204

208

Flow Temperature

200

210

220

Calibration Resistor

200

240

280

Overheat

Heater Wire

Heater Wire

Heater Wire

 

LED OFF

LED ON

LED ON

If the humidifier displays any other value than '200' or if the heater wire indicator is on, check that you have the correct calibration probe plugged in, otherwise the MR850 PCBs are faulty and they will need to be serviced or replaced (refer 7.2.3).

8. Remove the calibration probe, and press the mute button to exit service mode.

8.1.3Humidifier Display Test

This test is used to determine whether the humidifier's display is working correctly.

1.Enter the service menu (refer section 8.1.1).

2.Select service mode number 6 (Display test) by pushing the mute button when '-6-'is displayed.

3.Check that all of the display LEDs and indicators are turned on.

4.Push the mode button to change to a display cycle test. Check that all the LEDs and indicators light in sequence, and that there is only ever one LED on at a time.

5.Push the Mute button to exit back to the service menu.

If the humidifier does not pass the display test, then it is recommended that the humidifier PCBs are either replaced or sent for servicing (refer 7.2.3).

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45

8.1.4Humidifier Voltage Calibration Check

This check is required when the humidifier's PCBs have been serviced or replaced, or if the mains transformer has been replaced.

Equipment Required:

An AC voltmeter, capable of measuring RMS mains voltage to ±0.5 % accuracy.

Suitable breathing circuit for MR850 (for example 900RT100).

MR850 Heater Wire Adaptor (for example 900MR800).

1.Connect a breathing circuit to the humidifier with the heater wire adaptor. Make sure the inspiratory limb is correctly plugged in, and that a temperature or calibration probe is not plugged in to the humidifier.

2.Safely connect the AC voltmeter to the mains supply.

NOTE: Connect the voltmeter in close proximity to the mains socket used to power the humidifier.

3.Enter the service menu (refer section 8.1.1).

4.Select service mode number 3 (Voltage Calibration Check) by pushing the mute button when '-3-'is displayed.

5.Calculate the percentage of the actual mains voltage (the AC voltmeter reading) to the nominal mains voltage for the humidifier model being tested.

NOTE: The nominal mains voltage is the voltage indicated on the left side of the humidifiers case, and will be either 230 V~, 127 V~, 115 V~, or 100 V~.

Percentage mains = 100 x [Actual mains voltage (RMS) / Nominal Mains voltage]

For example:

MR850 Model AEK :

Voltmeter Reading : Percentage mains: Round any decimal points:

Nominal Mains Voltage is 230 V~ 240.5 V~

100 x [240.5 / 230] = 104.5 %

105

6.Adjust the reading on the humidifier's display to read the same as the value calculated above. This is achieved by pushing the mode button to increase, or the power button to decrease the percent value on the humidifier's display.

7.Check that the mains voltage has remained constant. If necessary recalculate the percentage of actual mains voltage.

8.Store the new value in the humidifier's memory by pushing and holding the mute and mode buttons together for 1 second. The humidifier will beep when the value has been correctly stored.

9.Exit the voltage calibration test by pushing and holding down the mute button for longer than one second.

8.1.5Humidifier Warm-upand Control Check

This section describes how to check the humidifier's heater control systems. This test should be performed if there is a problem with the humidifier, or after servicing of the humidifier.

Equipment Required:

MR850 Humidifier

MR850 Heater Wire Adaptor

Flow/Temperature Probe

Suitable breathing circuit for MR850 (for example: RT100)

Suitable chamber for MR850 (for example: MR290) filled with water

Gas supply - constant flow of: 10±5 SLPM (Standard Litres Per Minute)

1.Make sure that the humidifier passes the calibration and display checks (refer 8.1.2 and 8.1.3).

2.Set up the humidifier as shown in section 4.1. Make sure the chamber probe is correctly inserted and invasive mode selected.

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3.Connect the humidifier chamber inlet to the gas supply, and turn the humidifier on.

4.Wait approximately 30 minutes for the humidifier to stabilise.

Chamber and Airway temperatures can be checked by using the display mode (section 4.3.1) and set temperatures can be checked by using the diagnostic menu (section 6.4).

After the humidifier has had time to warm up, the temperature at the airway and chamber should be within +0.3 to -1.8°Cof their set point, with no alarms occurring.

If any alarms do occur, refer to section 6 (troubleshooting), and determine the cause. If the temperatures displayed are out of range, then refer to the MR850 operating manual, and check the humidifier's setup.

8.2Probe Accuracy Check

A probe accuracy check is used to test for the correct operation of the temperature / flow probe.

A Probe accuracy check consists of the following tests:

1.Probe Temperature Accuracy Test (section 8.2.1)

2.Probe Flow Accuracy Test (section 8.2.2)

8.2.1Probe Temperature Accuracy Test

This test is used to determine the temperature accuracy of the temperature/flow probes that are used with the MR850 humidifier.

Equipment Required:

MR850 Humidifier

Flow/Temperature Probe

Accurate Thermometer (Accuracy ± 0.5 degrees )

Container of water at approximately 40 °C, or a stirred water bath at 40 °C.

1.Perform a humidifier calibration test as outlined in section 8.1.2 to make sure the humidifier is reading temperature correctly (ignore this step if recently completed).

2.Place both the airway and chamber probes in a container of water (at approx. 40 °C), along with the accurate thermometer.

3.Make sure the water is constantly stirred, and wait approximately 30 seconds for the temperature to stabilise.

4.Enter the service menu (refer section 8.1.1).

5.Select service mode number 4 (Temperature Probe Check) by pushing the mute button when '-4-'is displayed.

6.Plug the probe under test into the humidifier.

NOTE: if a probe fault condition exists, the humidifier will alarm at this time.

7.The chamber temperature will be displayed; pressing the mode button will toggle between the airway and chamber temperature.

8.Compare the temperatures obtained with the thermometer. The temperature difference (between the humidifier temperatures and the thermometer) should not be greater than 1.5 degrees. If the difference is larger than 1.5 °C, the probe should be replaced.

8.2.2Probe Flow Accuracy Test

This test is used to determine the flow accuracy of the temperature/flow probes that are used with the MR850 humidifier.

Equipment Required:

MR850 Humidifier

Flow/Temperature Probe

Suitable Breathing Circuit for MR850 (for example: 900RT100)

Suitable Chamber for MR850 (for example: MR290)

Gas supply - constant flow of: 10 ± 1 SLPM (Standard Litres Per Minute)

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47

1.Perform a humidifier calibration check as outlined in section 8.1.2 (ignore this step if recently completed).

2.Set up the humidifier as shown in Figure 4.1. Make sure the chamber probe is correctly inserted into the breathing circuit.

3.Connect the humidifier chamber inlet to the gas supply.

4.Enter the service menu (refer section 8.1.1).

5.Select service mode number 5 (Flow Accuracy Check) by pushing the mute button when '-5-' is displayed.

6.Plug the probe under test into the humidifier.

NOTE: If a probe fault condition exists, the humidifier will alarm at this time.

7.The humidifier will display '---'until a flow measurement has been acquired.

8.Check that the flow measurement is between 5 and 15 LPM.

9.If the flow measurement is outside this range, make sure there are no water drops or deposits on the temperature / flow probe's glass thermistor, and repeat test.

10.If the flow measurement remains outside the specified range, the probe should be replaced.

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9 Recommended Maintenance Checklist

This sheet can be copied and used to keep a record of the maintenance procedures carried out on your MR850 Humidifier(s), and probes. Place the serial number and the date that the maintenance was carried out in the spaces provided. Refer to section 5 for a description of the maintenance procedures required.

9.1Humidifier Check (Annually)

Serial

Visual Checks

Performance

Electrical Safety

Signature

Number

 

 

Checks

 

 

and Date

 

1.

Mains Cable

1.

Calibration

1.

Earth Resistance

 

 

2.

Heater Plate

 

Check

2.

Insulation Resistance

 

 

3.

Heater Wire

2.

Display Check

3.

Earth Leakage

 

 

 

Adaptor

 

 

4.

Other tests as required

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9.2Probe Check (Every six months)

Batch ID

Visual Checks

Performance Checks

Signature

 

 

 

 

 

and Date

 

1.

Check Glass Thermistor

1.

Temperature Accuracy

 

 

2.

Check for Foreign Deposits

2.

Flow Accuracy

 

 

3.

Check Cable for Kinks, etc.

 

 

 

 

4.

Check Probe Connectors

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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(Blank)

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10 Spare Parts

Should any parts of the humidifier require replacement, the following parts list is provided. Refer to the exploded diagram on the opposite page for part identification.

Item

Part Number

Description

1

043 041 247

100 V~ Heater Plate Assembly

 

043 041 248

115 V~ Heater Plate Assembly

 

043 042 575

127 V~ Heater Plate Assembly

 

043 041 249

230 V~ Heater Plate Assembly

2

662 040 058

Heater Plate Spring

3

043 042 068

Front Case Replacement kit – 115 V~ (J models )

 

043 041 334

Front Case Replacement kit – 230 V~ (A models )

 

043 042 067

Front Case Replacement kit – 100 V~ (G models )

 

043 042 578

Front Case Replacement kit – 127 V~ (P models )

4

336 060 143

Heater Plate Case Screw

5

614 061 141

Transformer Mounting Screw

6

043 042 267

Rear case replacement kit – ADU model

 

043 042 268

Rear case replacement kit – AEA model

 

043 042 269

Rear case replacement kit – AEK model

 

043 042 270

Rear case replacement kit – AEU model

 

043 042 271

Rear case replacement kit – AFU model

 

043 042 272

Rear case replacement kit – AGU model

 

043 042 273

Rear case replacement kit – ALU model

 

043 042 274

Rear case replacement kit – ANU model

 

043 042 275

Rear case replacement kit – ARU model

 

043 042 276

Rear case replacement kit – JHU model

 

043 042 277

Rear case replacement kit – JSU model

 

043 042 278

Rear case replacement kit – PEU model

 

043 042 454

Rear case replacement kit – GJU model

7

043 041 250

Electronics PCB Assembly

8

621 040 524

Mounting Tongue Nut

9

622 040 512

Mounting Tongue Washer

10

693 041 483

Mains Cable Collet

11

614 040 120

Case Screw

12

095 428 322

Mains Cord, USA Plug, Right Angle (115 V~)

 

095 428 869

Mains Cord, USA Plug, Straight (100 V~)

 

095 428 317

Mains Cord, NZ / Australian Plug (230 V~)

 

095 428 569

Mains Cord, UK Plug (230 V~)

 

095 428 323

Mains Cord, European Schuko Plug (230 V~)

13

693 041 482

Mounting Tongue

14

614 063 026

Mounting Tongue Bolt

15

043 041 304

Transformer : 230 V~

 

043 042 576

Transformer : 127 V~

 

043 041 305

Transformer : 115 V~

 

043 041 306

Transformer : 100 V~

16

043 041 336

Equipotential Stud Kit (Option)

17

693 041 487

Finger guard MR850 blue

18

662 040 067

Spring for finger guard

19

341 040 560

Socket heater wire 4-way

20

341 040 561

Socket temperature/flow probe 6-way

21

341 040 559

Socket retaining ring yellow

22

341 040 558

Socket retaining ring blue

23

693 040 783

Side panel

24

336 060 148

Plastic rivet

25

693 041 486

Rubber button

26

653 040 124

Button retaining ring

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Heater Plate Assembly

Item

Part Number

Description

1

614 040 861

Screw (M4x12)

2

641 040 829

Reflector

3

336 060 149

Reflector Spacer Washers

4

641 040 707

Element Cover

5

331040 114

Mica Insulator

6614 040 327 Thermistor Screw

7614 040 117 Earth Strap Screw

8622 040 130 Earth Strap Washer

9

095 428 320

Earth Strap

10

655 040 111

Aluminium Heater Plate

11

349 040 052

Thermal Cutout

12043 041 254 Thermistor Assembly Kit

13614 040 327 Thermal Cutout Screw

14043 041 251 Element Kit: 230 V~

043 042 577 Element Kit: 127 V~

043 041 252 Element Kit: 115 V~

043 041 253 Element Kit: 100 V~

15

614 040 117

Screw (M4x8)

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11 Calibration Probe

The information presented here refers to the construction of the MR850 Calibration Probe. This information is provided so that the probe can be checked for correct operation if required.

The calibration probe consists of two Redel plugs, each containing four 0.1 % tolerance resistors. In order to measure the absolute accuracy of these resistors; it is recommended that an ohm meter with better than ± 0.2 % accuracy is used.

To measure the value of the resistors used in the probes, unscrew the cable collet holding the plug together in order to gain access to the connector pins.

Blue collet

Chamber temperature = 75.0 °C Airway temperature = 42.8 °C

Grey collet

Chamber temperature = 55.2 °C Airway temperature = 40.5 °C

The measured values must be accurate to + 0.3 % of their nominal value when using a meter accurate to ± 0.2 %.

Contact a Fisher & Paykel Healthcare representative if an independent calibration probe check is required.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

55

12 Serial Port & Logging Software

12.1INTRODUCTION

The View850 software* is intended for use with the Fisher & Paykel Healthcare MR850 Respiratory Humidifier. The software can be used to display humidifier data and log the results to a file. A serial cable, part number 900MR888*, is required in order to link the MR850 humidifier to a PC.

WARNING:

The serial port must not be used when the humidifier is in patient use.

Equipment connected to the serial -portmust comply with the safety standard IEC60950 for Personal Computers.

No liability for consequential damage: In no event shall Fisher & Paykel Healthcare or its suppliers be liable for any damages arising out of the use of this View850 product.

*View850 software is supplied on the MR850 Technical CD and can be ordered along with the 900MR888 serial cable from Fisher and Paykel Healthcare.

12.2INSTALLATION

Installing View850 software from the MR850 Technical CD.

1.Insert CD into Personal Computer.

2.Select ‘Install View850’ from menu list.

3.Follow the install instructions.

4.The software is now ready to run.

12.3OPERATING INSTRUCTIONS

12.3.1Viewing Humidifier Data

Connect a 900MR888 serial cable* from the serial socket located on the bottom of the MR850 to a communications port (RS-232)on the host computer. Run the View850.exe program from the Microsoft Windows Start Menu, Programs, View850.

Set the correct com. port in the View850 software by going to the Config. Menu and clicking on Settings. The com. port can be changed within the Settings dialog box.

Finally, start the program running by clicking on the `RUN' button. To stop, click the `Running' button.

56 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

12.3.2Logging Humidifier Data to File

The View850 software can log the data it receives to a text file. This text file can then be opened at a later date (by programs such as Microsoft Excel), in order to review humidifier performance.

In order to log the humidifier data, first start the program running. Next set the directory you want the log files to be placed in, by using the menu buttons. Select a directory, and then click on the `OK' button.

To start the program logging, click on the `Log Data to file' button. A log-filewill be created. The name of the file will be the current time and date, followed by an `.850' extension. To stop, click the `Logging Data to File' button.

The log rate (how often the data is saved to file) can be changed through the menu buttons.

Note: For further information on this program, view the ‘Readme.txt’ file.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

57

13 EMC INFORMATION

WARNING:

The use of accessories other than those specified by Fisher & Paykel Healthcare may result in increased emissions or decreased immunity of the equipment or system.

Guidance and manufacturer’s declaration – electromagnetic emissions

The MR850 is intended for use in the electromagnetic environment specified below. The customer or the user of the MR850 should assure that it is used in such an environment.

Emissions test

Compliance

Electromagnetic environment - guidance

 

 

 

RF emissions CISPR 11

Group 1

The MR850 uses RF energy only for its internal function.

 

 

Therefore, its RF emissions are very low and are not likely to

 

 

cause any interference in nearby electronic equipment.

 

 

 

RF emissions CISPR 11

Class B

The MR850 is suitable for use in all establishments, including

 

 

domestic establishments and those directly connected to the

Harmonic emissions

Class B

public low-voltagepower supply network that supplies buildings

IEC 61000-3-2

 

used for domestic purposes.

 

 

 

 

 

Voltage fluctuations/ flicker emissions

Complies

 

IEC 61000-3-3

 

 

 

 

 

Guidance and manufacturer’s declaration – electromagnetic emissions

The MR850 is intended for use in the electromagnetic environment specified below. The customer or the user of the MR850 should assure that it is used in such an environment.

Emissions test

IEC 60601-1test level

Compliance level

Electromagnetic environment - guidance

 

 

 

 

Electrostatic discharge

± 6 kV contact

± 6 kV contact

Floors should be wood, concrete or ceramic

(ESD)

± 8 kV air

± 8 kV air

tile. If floors are covered with synthetic

IEC 61000-4-2

material, the relative humidity should be at

 

 

least 30 %.

 

 

 

 

 

 

 

Electrical fast

± 2 kV for power supply

± 2 kV for power supply

Mains power quality should be that of a

transient/burst

lines

lines

typical commercial or hospital environment.

IEC 61000-4-4

± 1 kV for input/output lines

± 1 kV for input/output lines

 

 

 

 

 

Surge

± 1 kV differential mode

± 1 kV differential mode

Mains power quality should be that of a

IEC 61000-4-5

± 2 kV common mode

± 2 kV common mode

typical commercial or hospital environment.

 

 

 

 

 

Surge

± 1 kV differential mode

± 1 kV differential mode

Mains power quality should be that of a

IEC 61000-4-5

± 2 kV common mode

± 2 kV common mode

typical commercial or hospital environment.

 

 

 

 

 

Voltage dips, short

< 5 % UT (> 95 % dip inUT)

< 5 % UT (> 95 % dip inUT)

Mains power quality should be that of a

interruptions and voltage

for 0,5 cycle

for 0,5 cycle

typical commercial or hospital environment.

variations on power supply

40 % UT (60 % dip inUT)

40 % UT (60 % dip inUT)

If the user of the MR850 requires continued

input lines

operation during power mains interruptions,

for 5 cycles

for 5 cycles

IEC 61000-4-11

it is recommended that the MR850 be

 

 

70 % UT (30 % dip inUT)

70 % UT (30 % dip inUT)

powered from an uninterruptible power

 

 

supply or a battery.

 

for 25 cycles

for 25 cycles

 

 

 

< 5 % UT (> 95 % dip inUT)

< 5 % UT (> 95 % dip inUT)

 

 

for 5 sec

for 5 sec

 

 

 

 

 

Power frequency (50/60

3 A/m

3 A/m

Power frequency magnetic fields should be

Hz) magnetic field

 

 

at levels characteristic of a typical location in

IEC 61000-4-8

 

 

a typical commercial or hospital

 

 

environment.

 

 

 

 

 

 

 

NOTE UT is the a.c. mains voltage prior to application of the test level.

58 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

Guidance and manufacturer’s declaration – electromagnetic immunity

The MR850 is intended for use in the electromagnetic environment specified below. The customer or the user of the MR850 should assure that it is used in such an environment.

Immunity test

IEC 60601 test level

Compliance

 

Electromagnetic environment guidance

 

 

level

 

 

 

 

 

 

 

 

Portable and mobile RF communications equipment should be used

 

 

 

 

no closer to any part of the MR850 including cables, than the

 

 

 

 

recommended separation distance calculated from the equation

 

 

 

 

applicable to the frequency of the transmitter.

 

 

 

 

Recommended separation distance

 

 

 

 

 

 

 

Conducted RF

3 Vrms

3 V

 

d = 1,2P

 

IEC 61000-4-6

150 kHz to 80 MHz

 

 

 

 

 

 

 

 

 

 

 

 

Radiated RF

3 V/m

3 V/m

 

d = 1,2P

80 MHz to 800 MHz

IEC 61000-4-3

80 MHz to 2,5 GHz

 

 

d = 2,3P

800 MHz to 2.5 GHz

 

 

 

 

where P is the maximum output power rating of the transmitter in

 

 

 

 

 

 

 

 

watts (W) according to the transmitter manufacturer and d is the

 

 

 

 

recommended separation distance in metres (m).

 

 

 

 

Field strengths from fixed RF transmitters, as determined by an

 

 

 

 

electromagnetic site survey a ,should be less than the compliance

 

 

 

 

level in each frequency range b.

 

 

 

 

Interference may occur in the vicinity of equipment marked with the

 

 

 

 

following symbol:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.

NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.

aField strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the MR850 is used exceeds the applicable RF compliance level above, the MR850 should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the MR850.

bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

Recommended separation distances between portable and mobile RF communications equipment and the MR850

The MR850 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the MR850 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the MR850 as recommended below, according to the maximum output power of the communications equipment.

 

Separation distance according to frequency of transmitter (m)

 

 

 

 

Rated maximum output

150 kHz to 80 MHz

80 MHz to 800 MHz

800 MHz to 2,5 GHz

power of transmitter (W)

D = 1,2P

D = 1,2P

D = 2,3P

 

 

 

 

 

0,01

0,12

0,12

0,23

 

 

 

 

0,1

0,38

0,38

0,73

 

 

 

 

1

1,2

1,2

2,3

 

 

 

 

10

3,8

3,8

7,3

 

 

 

 

100

12

12

23

 

 

 

 

For transmitters rated at a maximum output power not listed above, the recommended separation distance d in metres (m) can be estimated using the equation applicable to the frequency of the transmitter, whereP is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.

NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.

NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

59

14 Product Change History

Due to upgrades performed on delivered MR850 Respiratory Humidifiers, software and hardware versions are listed below.

It should be realised that possible future upgrades may change the operation of the Humidifier. Please note that software Versions 4.40 and 4.44 will only work with Revision A or B PCB’s and Version 5.12 or later will only work with Revision C, D or E PCB’s.

History Change for model JHU

PCB

 

Software

 

Introduction

Serial Number

Comments

Version

 

Version

 

 

 

 

 

 

 

 

 

 

 

A

 

4.40

19

September 1998

9885xxx00000

First production release.

 

 

 

 

 

 

 

A

 

4.44

22

October 1998

 

Software upgrade.

 

 

 

 

 

 

 

C

 

5.12

12

April 1999

9985xxx00053

Release of new PCB to

 

 

 

 

 

 

accommodate change in

 

 

 

 

 

 

temperature probe circuit

 

 

 

 

 

 

redesign.

 

 

 

 

 

 

C

 

5.13

5 May 1999

 

Software upgrade.

 

 

 

 

 

 

 

D

 

5.13

14

January 2000

2000-85xxx00028

Release of new PCB to improve

 

 

 

 

 

 

manufacture.

 

 

 

 

 

 

D

 

5.23

3 April 2000

2000-85xxx01661

Software upgrade for low flow

 

 

 

 

 

 

control stability.

 

 

 

 

 

 

 

D

 

5.33

25

July 2000

2000-85xxx02806

Software upgrade, allowing

 

 

 

 

 

 

Neonatal volume ventilation

 

 

 

 

 

 

capability. Manual Temperature

 

 

 

 

 

 

Compensation (TC)

 

 

 

 

 

 

implemented.

 

 

 

 

 

 

 

D

 

5.34

11

October 2000

2000-85xxx04212

Software upgrade to improve

 

 

 

 

 

 

EMI immunity.

 

 

 

 

 

 

 

D

 

5.45

19

February 2001

2001-85xxx00427

Software upgrade.

 

 

 

 

 

 

D

 

7.00

2 April 2002

2002-85xxx00976

Software upgrade.

 

 

 

 

 

 

Improve HC speed in Non-

 

 

 

 

 

 

invasive mode.

 

 

 

 

 

 

F&P Co-axialcircuit recognition

 

 

 

 

 

 

and control.

 

 

 

 

 

 

 

D

 

5.70

14

April 2003

2003-85JHU008266

Software release USA only.

 

 

 

 

 

 

 

D

 

7.23

31

May 2004

2004-85JHU006084

Added Non-heaterwire

 

 

 

 

 

 

operation.

 

 

 

 

 

 

PTS access through serial

 

 

 

 

 

 

command.

 

 

 

 

 

 

Humidifier model protection.

 

 

 

 

 

 

Remove HC.

 

 

 

 

 

 

Software release USA only.

 

 

 

 

 

 

E

 

7.23

5 July 2004

2004-85JHU008300

Release of new PCB capable of

 

 

 

 

 

 

selective soldering.

 

 

 

 

 

 

 

60

MR850 Technical Manual

* Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

History Change for model GJU

PCB

Software

 

Introduction

Serial Number

Comments

Version

Version

 

 

 

 

 

 

 

 

 

 

A

4.40

19

September 1998

9885xxx00000

First production release.

 

 

 

 

 

 

A

4.44

22

October 1998

 

Software upgrade.

 

 

 

 

 

 

C

5.12

12

April 1999

9985xxx00053

Release of new PCB to

 

 

 

 

 

accommodate change in

 

 

 

 

 

temperature probe circuit

 

 

 

 

 

redesign.

 

 

 

 

 

C

5.13

5 May 1999

 

Software upgrade.

 

 

 

 

 

 

D

5.13

14

January 2000

2000-85xxx00028

Release of new PCB to

 

 

 

 

 

improve manufacture.

 

 

 

 

 

D

5.23

3 April 2000

2000-85xxx01661

Software upgrade for low flow

 

 

 

 

 

control stability.

 

 

 

 

 

 

D

5.33

25

July 2000

2000-85xxx02806

Software upgrade, allowing

 

 

 

 

 

Neonatal volume ventilation

 

 

 

 

 

capability. Manual

 

 

 

 

 

Temperature Compensation

 

 

 

 

 

(TC) implemented.

 

 

 

 

 

 

D

5.34

11

October 2000

2000-85xxx04212

Software upgrade to improve

 

 

 

 

 

EMI immunity.

 

 

 

 

 

 

D

5.45

19

February 2001

2001-85xxx00427

Software upgrade.

 

 

 

 

 

 

D

6.00

15

November 2001

Only released as

Software upgrade.

 

 

 

 

software upgrade

Introduction of the automatic

 

 

 

 

kits.

and manual Humidity

 

 

 

 

 

Compensation (HC) mode.

 

 

 

 

 

Added time delay to the OFF

 

 

 

 

 

button. Enable low

 

 

 

 

 

temperature alarm in stand-by.

 

 

 

 

 

D

7.00

2 April 2002

2002-85xxx00976

Software upgrade.

 

 

 

 

 

Improve HC speed in Non-

 

 

 

 

 

invasive mode.

 

 

 

 

 

F&P Co-axialcircuit

 

 

 

 

 

recognition and control.

 

 

 

 

 

 

D

7.20

18

March 2004

2004-85GJU002592

Software upgrade.

 

 

 

 

 

D

7.21

9 June 2004

2004-85GJU006775

Software upgrade.

 

 

 

 

 

PTS access through serial

 

 

 

 

 

command.

 

 

 

 

 

Humidifier model protection.

 

 

 

 

 

Software release Japan only.

 

 

 

 

 

E

7.21

9 July 2004

2004-85GJU008765

Release of new PCB capable

 

 

 

 

 

of selective soldering.

 

 

 

 

 

 

MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)

61

History Change for all model except JHU & GJU

PCB

Software

 

Introduction

Serial Number

Comments

Version

Version

 

 

 

 

 

 

 

 

 

 

A

4.40

19

September 1998

9885xxx00000

First production release.

 

 

 

 

 

 

A

4.44

22

October 1998

 

Software upgrade.

 

 

 

 

 

 

C

5.12

12

April 1999

9985xxx00053

Release of new PCB to

 

 

 

 

 

accommodate change in

 

 

 

 

 

temperature probe circuit

 

 

 

 

 

redesign.

 

 

 

 

 

C

5.13

5 May 1999

 

Software upgrade.

 

 

 

 

 

 

D

5.13

14

January 2000

2000-85xxx00028

Release of new PCB to

 

 

 

 

 

improve manufacture.

 

 

 

 

 

D

5.23

3 April 2000

2000-85xxx01661

Software upgrade for low flow

 

 

 

 

 

control stability.

 

 

 

 

 

 

D

5.33

25

July 2000

2000-85xxx02806

Software upgrade, allowing

 

 

 

 

 

Neonatal volume ventilation

 

 

 

 

 

capability. Manual

 

 

 

 

 

Temperature Compensation

 

 

 

 

 

(TC) implemented.

 

 

 

 

 

 

D

5.34

11

October 2000

2000-85xxx04212

Software upgrade to improve

 

 

 

 

 

EMI immunity.

 

 

 

 

 

 

D

5.45

19

February 2001

2001-85xxx00427

Software upgrade.

 

 

 

 

 

 

D

6.00

15

November 2001

Only released as

Software upgrade.

 

 

 

 

software upgrade kits.

Introduction of the automatic

 

 

 

 

 

and manual Humidity

 

 

 

 

 

Compensation (HC) mode.

 

 

 

 

 

Added time delay to the OFF

 

 

 

 

 

button. Enable low

 

 

 

 

 

temperature alarm in stand-by.

 

 

 

 

 

D

7.00

2 April 2002

2002-85xxx00976

Software upgrade.

 

 

 

 

 

Improve HC speed in Non-

 

 

 

 

 

invasive mode.

 

 

 

 

 

F&P Co-axialcircuit

 

 

 

 

 

recognition and control.

 

 

 

 

 

 

D

7.14

22

April 2003

2003-85xxx009621

Software upgrade.

 

 

 

 

 

Auto HC increased to +5 °C.

 

 

 

 

 

Diagnostic menu changes.

 

 

 

 

 

Added Non-heaterwire

 

 

 

 

 

operation.

 

 

 

 

 

 

D

7.17

31

July 2003

2003-85xxx013518

Software upgrade.

 

 

 

 

 

 

D

7.22

28

May 2004

2004-85xxx006024

PTS access through serial

 

 

 

 

 

command.

 

 

 

 

 

Humidifier model protection.

E

7.22

2 July 2004

2004-85xxx008200

Release of new PCB capable

 

 

 

 

 

of selective soldering.

 

 

 

 

 

 

62 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)