Welch Allyn Spot Vital Signs User manual

Manuals

Operator Manual

Service Manual

Spot Vital Signs

PN 95P506E

Copyright 2001

Welch Allyn, Inc. Spot Vital Signs Service Manual
Revision A

Spot Vital Signs Service Manual

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Welch Allyn, Inc. Spot Vital Signs Service Manual
Revision A

Revision History

Version Date Author Description

A 3/31/01 JDB Introduction of Service Manual

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Table of Contents

SSeeccttiioonn 11 GGeenneerraall IInnffoorrmmaattiioon

1.1-To Service Personnel:......................................................................................................................5

1.2 Limited Warranty ............................................................................................................................6

Service Policy....................................................................................................................................6

Technical Assistance .........................................................................................................................6

1.3 Basic System Description ................................................................................................................8

Introduction.......................................................................................................................................8

1.4 Basic System Operation...................................................................................................................9

1.5 Specifications................................................................................................................................ 13

1.6 Identification Label and Serial Numbering System Defined ...........................................................16

1.7 Firmware Identification .................................................................................................................17

SSeeccttiioonn 22 SSeerrvviicce

2.1 Intent of Manual and Product Scope. .............................................................................................18

2.2 Test Equipment Bench Layout: ......................................................................................................19

2.3 Required Tools and Fixtures for Service .......................................................................................20

2.4 Required Tools and Fixtures for Service .......................................................................................21

2.5-Replacement Parts :.......................................................................................................................22

2.6-Supplies and Accessories:..............................................................................................................22

2.7 Maintenance and Service Support.....................................................................................................25

Section 3 Problem Diagnosis ...................................................................................................................26

3.1 Diagnostic Procedure for Returned Units..........................................................................................26

3.2 Calibration Procedure : Voltage...................................................................................................... 29

3.3 Calibration Procedure : Pressure.................................................................................................. 30

3.4 SELF DIAGNOSTIC FAULT CODES..........................................................................................31

3.5 COMPLAINT / CAUSE / CORRECTIVE ACTION .....................................................................33

Section 4 Removal/Replacement of Parts................................................................................................. 39

4.1 Battery...........................................................................................................................................39

4.2 Temperature Pod and Temperature Connector PCB removal ......................................................... 40

4.3 Front Housing and Switch Array...................................................................................................41

4.4 Display PCB................................................................................................................................. 42

4.5 Remove Power and Battery Cable.................................................................................................. 43

4.6 Main PCB Removal .......................................................................................................................44

4.7 SpO2 PCB Removal (If configured with SpO2) ............................................................................ 45

4.8 Pump and Valve Removal..............................................................................................................46

Section 5 Test Procedures........................................................................................................................47

Section 5.1 Calibration Tests ...............................................................................................................47

Section 5.2 Current Tests ....................................................................................................................48

Section 5.3 Noise Levels......................................................................................................................49

Section 5.4 Button Test ....................................................................................................................... 50

Section 5.5 Interface Test ....................................................................................................................51

Section 5.6 Print Quality..................................................................................................................... 52

Section 5.7 Pneumatic Tests................................................................................................................53

Section 5.8 SpO2 Tests........................................................................................................................54

Section 5.9 Temperature Tests.............................................................................................................55

Section 5.10 Fail Safe Testing............................................................................................................. 56

Section 5.11 Check List For Spot Vital Signs Service Work ..............................................................57

Section 6 Drawings................................................................................................................................. 59

Section 7 Repair Test Specifications........................................................................................................ 60

e....................................................................................................................................18

n ................................................................................................................5

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SSeeccttiioonn 11 GGeenneerraall IInnffoorrmmaattiioon

n

1.1-To Service Personnel:

Read and understand the Spot Vital Signs Operator’s Manual and this Service Manual. The
information contained in both of these publications is subject to change without notice and should not
be construed as a commitment by Welch Allyn, Inc.

Welch Allyn assumes no responsibility for any errors that may appear in this manual. If the product
and/or its operation varies significantly from any description herein, please contact the following:

WELCH ALLYN,, INC. TECHNICAL SERVICE DEPARTMENT:
1-800-450-9275
[phone]
Fax [phone]

Welch Allyn,, Inc. .
95 Old Shoals Road
Arden, North Carolina 28704

This product has been designed to provide a high degree of safety and reliability. However, we can
not guarantee against: deterioration of components due to aging, normal wear, tampering, and abuse.

All service and repairs must be performed by authorized Welch Allyn personnel or agents, using
approved Welch Allyn replacement parts and approved process materials. Failure to so will
invalidate the product warranty. Please refer to the product warranty for specific coverage.

Welch Allyn, Inc.
95 Old Shoals Road
Arden, North Carolina 28704
USA
1 800 450-9275

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1.2 Limited Warranty

Welch Allyn, Inc. warrants the Spot Vital Signs, when new, to be free of defects in material and
workmanship and to perform in accordance with manufacturer's specifications for a period of two
years from the date of purchase from Welch Allyn, Inc. or its authorized distributors or agents.
Welch Allyn, Inc. will either repair or replace any components found to be defective or at variance
from manufacturer's specifications within this time at no cost to the customer. It shall be the
purchaser's responsibility to return the instrument to Welch Allyn, Inc. or an authorized distributor,
agent or service representative. This warranty does not include breakage or failure due to tampering,
misuse, neglect, accidents, modification or shipping. This warranty is also void if the instrument is
not used in accordance with manufacturer's recommendations or if repaired by other than Welch
Allyn, Inc. or an authorized agent. Purchase date determines warranty requirements. No other
express warranty is given.

To receive service assistance or to ask questions regarding this
warranty, please call or write:
Welch Allyn, Inc. Technical Services Dept.
95 Old Shoals Road
Arden, North Carolina 28704 USA
1 [phone] or [phone]
Fax: [phone]

Service Policy

All repairs on products under warranty must be performed or approved by a Welch Allyn, Inc.
Service Center. Unauthorized repairs will void the warranty. Products out of warranty should be
repaired by qualified electronics personnel or a Welch Allyn, Inc. Service Center.

Technical Assistance

If you have an equipment problem that you cannot resolve, call the Welch Allyn, Inc. Service Center
nearest you for assistance. Technical service support is available to you by telephone on normal
business days at the locations listed on the next page

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Before returning a product for repair you must obtain authorization from Welch Allyn, Inc. An
RMA (Return Material Authorization) number will be given to you by our service personnel. Be
sure to note this number on the outside of your shipping box. Returns without an RMA number
will not be accepted for delivery.

Welch Allyn, Inc. Service Centers

For Service or Repair

USA Customers CANADA Customers
Welch Allyn, Inc. Welch Allyn Canada Limited

Technical Service Centers Technical Service Centers
95 Old Shoals Road 160 Matheson Blvd., East
Arden, NC 28704-9739 USA Mississauga, Ontario L4Z CANADA
Phone: [phone] Phone: [phone] or 1 800-561-8797
Fax: [phone] Fax: [phone]

INTERNATIONAL Customers

Welch Allyn GmbH Welch Allyn Australia Pty. Ltd.

Technical Service Center Technical Service Center
Zollerstrasse 2-4 Road 5/38-46 South Street
D-72417 Jungingen Rydalmere NSW 1701
GERMANY AUSTRALIA
Phone: [49]-7477-927-10 Phone: [61] 29-4183-155
Fax: [49]-7477-9271-90 Fax: [61] 29-4183 650

Welch Allyn Ltd. Welch Allyn UK Ltd.

21-09 Golden Mile to 6001 Cublington Road
Beach Road Aston Abbots
Singapore 199589 Buckinghamshire HP22 4ND
REPUBLIC OF SINGAPORE UNITED KINGDOM
Phone: [65]-291-0882 Phone: [44] 129-668-2140
Fax: [65]-291-5780 Fax: [44] 129-668-2104

LATIN AMERICA Customers

MDI International

Technical Service Centers
7324 SW 48th Street
Suite A
Miami, FL 33155 USA
Phone: [phone]
Fax: [phone]

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1.3 Basic System Description

Introduction

The Welch Allyn Spot Vital Signs is designed to non-invasively and automatically measure systolic
and diastolic pressure, pulse rate, temperature and oxygen saturation (SpO2 ) for adult and pediatric
patients. THE WELCH ALLYN SPOT VITAL SIGNS IS NOT INTENDED TO BE USED ON
NEONATAL PATIENTS. All blood pressure, pulse, temperature and SpO2 values can be viewed on
a large, easy-to-read display, and may be printed via the IrDA port to an external printer as desired.
The rechargeable lead acid battery and variety of mounting accessories make the Welch Allyn Spot
Vital Signs convenient for many locations. The operator may choose any combination of
simultaneous measurement modalities. The Welch Allyn Spot Vital Signs is intended for use in a wide
variety of health care settings. This includes hospital departments, as well as alternate care settings,
such as physicians offices, clinics, and long term care facilities. The Welch Allyn Spot Vital Signs is
not intended for continuous monitoring of patients, or for use during transport of a patient. The
Welch Allyn Spot Vital Signs is not intended for use in environments that are not supervised by a
health care practitioner.

Refer to the Spot Vital Signs Operator’s Manual for complete information on Indications For Use,
Special Features, Supplies and Accessories

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1.4 Basic System Operation

Blood Pressure Measurements

A single blood pressure determination is made when the blood pressure START/STOP button is
pushed.

A measurement cycle may be cancelled at any time by pressing the BP START/STOP button again.
This action immediately initiates a rapid cuff deflation.

The blood pressure measurement data will appear on the display immediately following the
measurement and remain displayed for two minutes. After two minutes, the display goes blank, and
the device will go into standby mode. The most recent BP measurement may be recalled by pressing
the Print, Mode, Next Patient/Clear or BP Start/Stop button.

Max/Min Blood Pressure Ranges

The maximum and minimum ranges of blood pressure are detailed below:

Mean Arterial Pressure (MAP)

Ranges 40 - 190mmHg
Calculated from Systolic and Diastolic data (not directly measured).

Temperature Operating Modes

Thermometry measurements are made with the Welch Allyn SureTemp ™ technology. Oral and rectal
probes utilize single-use disposable probe covers that limit cross-contamination. Oral, axillary or
rectal temperatures are taken using ‘Normal or ‘Monitor operating modes. Axillary temperatures are
taken using the (blue) oral probe.

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Rectal temperatures are taken using the (red) rectal probe. In the Normal mode the thermometer's
microprocessor "predicts" body temperature in about 4 seconds for oral temperatures, about 10
seconds for axillary temperatures, and in about 15 seconds for rectal temperatures. The monitor mode
displays the patient’s actual temperature after 3 minutes for oral/ rectal mode and 5 minutes for
axillary mode, and will continue to display an updated temperature as long as the probe remains in
place. Temperature readings may be displayed in Fahrenheit or Celsius scales.

Max/Min Temperature Ranges

Temperature Normal Mode

In Normal Mode, the Spot Vital Signs will measure temperature at discrete intervals and then
calculate the rate of change according to a proven algorithm. This allows the thermometer to predict
the end point that the thermistor would reach if it were left in the mouth until it reached mouth
temperature. This predictive feature allows the thermometer to arrive at an accurate oral temperature
reading in approximately 4 seconds.
Normal mode is the default operating mode for the temperature determinations.
Operator selectable patient alarm limits are not available in temperature Normal mode. However,
temperatures that are outside of the operating range of the device will be noted on the temperature
display.

Temperature Monitor Mode

Continuous Monitor Mode operation is normally used when difficult situations prevent accurate
temperatures from being taken in the Normal mode. The probe must be in contact with tissue for at
least three minutes for accurate oral/rectal temperature measurement and five minutes for accurate
axillary temperature measurement. Monitor mode temperatures may not be identical to predicted
‘Normal’ temperatures because of ambient temperature influence and other factors The trend in
temperature is the important standard to be observed when in the Monitor mode. Operator selectable
patient alarm limits are not available in temperature monitor mode. However, temperatures that are
outside of the normal operating range of the device will be noted on the temperature display.

SpO2 Operating Mode

* The Spot Vital Signs incorporates the Nellcor Puritan Bennett ™ pulse oximetry system which
determines arterial oxyhemoglobin saturation (SpO2 %) by measuring the absorption of red and
infrared light passed through the tissues.

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* Changes in absorption caused by pulsation of blood in the vascular bed are used to determine
arterial saturation and pulse rate. Oxygen saturation percent is calculated with each pulse detected,
and thus the device display is continually updated. The pulse signal bar graph is an indicator of the
strength and quality of the detected pulses.
* The Spot Vital Signs is capable of determining pulse rate as an adjunct to the blood pressure
measurement and the SpO2 measurement.
* The pulse rate, in beats per minute, will be determined primarily from the SpO2 measurement
methodology. In the case where SpO2 is not available, or is disabled, the pulse rate display will be
driven from data collected as part of the blood pressure measurement method.
* Removal of the SpO2 sensor from the patient will initiate an audible beep, to alert the user that the
sensor has been disconnected.
* SpO2 is generally measured via pulses detected using a finger sensor, and performs most accurately
with the finger clip sensor. The finger clip sensor may be used on all fingers except the thumb. For
certain situations SpO2 may be measured at alternate sites including the earlobe, forehead and toes.
Special sensors must be employed in these situations. The finger clip sensor is recommended for spot
checks or short-term evaluation (less than 60 minutes). Patient supervision is required as the Spot
Vital Signs has no alarm capability.
* Oxygen Saturation and pulse rate is displayed on the LCD display. On each detected pulse, the
pulse signal bar graph flashes. The intensity of this signal is a simple visual indicator of waveform
signal strength, and can identify situations where the pulsatile nature of the tissue may not be
adequate for an accurate SpO2 reading. The update interval bar of the bar graph should correspond
to the patient’s pulse rate. This is an indication of the quality of the SpO2 signal.

Max/min SpO2 Ranges

The SpO2 sensor is designed to detect oxygen saturation as follows:

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Pulse Rate Feature

The Welch Allyn Spot Vital Signs is capable of determining pulse rate as an adjunct to the blood
pressure measurement and the SpO2 measurement. The pulse rate, in beats per minute, will be
determined primarily from the SpO2 measurement methodology. In the case where SpO2 is not
available, or is disabled, the pulse rate display will be derived by data from the blood pressure
measurement method.

Max/Min Pulse Rate Ranges

The maximum and minimum pulse rate ranges are as follows:

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1.5 Specifications

The performance specifications of the Spot Vital Signs are as follows:

Patient Population

The Welch Allyn Spot Vital Signs is designed for use with adult and pediatric patients. Welch Allyn
defines a pediatric patient as 29 days old and above. THE SPOT VITAL SIGNS IS NOT
INTENDED FOR USE WITH NEONATES. Welch Allyn defines neonates as children 28 days or
less of age born at term (37 weeks gestation or more): otherwise, up to 44 gestational weeks.

Cuff Pressure Range

0 mmHg - 300mmHg

Initial Cuff Inflation

160 mmHg, smart inflation

Systolic Determination

Maximum: 250 mmHg
Minimum: 60 mmHg

Diastolic Determination

Maximum: 160 mmHg
Minimum: 30 mmHg

Blood Pressure Accuracy

Blood pressure accuracy meets or exceeds SP10-1992 AAMI standards for non-invasive blood
pressure accuracy (AAMI standard: ± 5 mmHg mean error; 8 mmHg standard deviation). Blood
pressure accuracy is validated for pressure measurement using the upper arm only.

Blood Pressure Determination Time

20 seconds to 45 seconds typical, 165 seconds maximum.

Pulse Rate Determination (Using SpO2 determination)

Maximum: 245bpm
Minimum: 25bpm

Pulse Rate Accuracy

SpO2 Module Heart Rate ±3.0 bpm
Blood Pressure Algorithm Heart Rate ±5.0

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Overpressure Cutoff

315 mmHg ±15 mmHg

Temperature Ranges

Temperature Accuracy

Temperature accuracy meets or exceeds ASTM E112-86: "Standard Specification for Electronic
Thermometer for Intermittent Determination of Patient Temperature."

Temperature Determination Time

(Oral) 4 seconds typical, 15 seconds maximum
(Axillary) 10 seconds typical
(Rectal) 15 seconds typical

Oxygen Saturation Range (SpO2 %)

40-100% oxygen saturation

SpO2 Accuracy

±3% in the range of 70-100% oxygen saturation (1 Standard Deviation)
<70% unspecified by the OEM.

Battery Charging

To 90%-100% capacity in 12 hours. Unit will operate and charge battery simultaneously when
connected to power source.

Mechanical Specifications

Dimensions

Height 9.70 inches (24.64 cm)
Length 5.72 inches (14.53 cm)
Depth 4.73 inches (12.01 cm)

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Weight

Approximately 4.25 pounds

Mounting

Self-supporting on rubber feet
Custom Mobile Stand
Custom Made Wall Mount

Portability

May be hand carried when held by the rear handle.

Electrical Specifications

Power Requirements

Patient-Rated isolation transformer is connected to AC mains:
North American Version: 120VAC, 60 Hz. 0.20A Input Source, 8VDC, 0.75A Output Source
International Version: 220-240VAC, 50-60Hz 0.20A Input Source, 8VDC, 0.75A Output Source

Battery

Lead acid, with external charger.
A fully charged battery will support 150"typical" blood pressure determinations taken at 7 minute
intervals. Battery is 90-100% charged after 6-12 hours of charging. The battery automatically charges
when the Spot Vital Signs is powered through the AC power transformer. The battery will charge
faster when the instrument is not in operation.

Environmental Specifications

Operating Temperature

+10°C to +40°C (Except temperature 16°C to 40° C)
+50°F to +104°F

Storage Temperature

-20°C to +50°C

-4°F to +122°F

Relative Humidity

15 to 90% (non-condensing)

Operating Altitude

-170m to +4877m

-557ft. to +16,000ft.

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1.6 Identification Label and Serial Numbering System Defined

The identification label for the 420 Series Spot Vital Signs is shown below. It is located on the
bottom of the unit.

The serial number for the device would consist of nine (9) numbers and a bar code. These would be
located in the square below the words “420 Series.” An example of the number and the explanation is

shown below:

200100001

The four digits on the left Are the year of manufacture of the device.
The five digits on the right are the sequence of build starting with 00001 annually.

(The example number above would be the first unit built in 2001)

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1.7 Firmware Identification

To confirm the software levels of the 420 Series Spot Vital Signs, place the unit into the
“Configuration Test” mode by holding down the Start button while the unit is being powered up.

The main software versions will appear as follows:
* In the SW1 Screen, the top two numbers is the software version of the Spot Module and the other
numbers are for the SpO2 module (if installed). Press the “Start” or “Clear” button to cycle through
the SpO2 software number.

In the SW2 screen, The two numbers represent the NIBP module software and the Temperature
Algorithm Version (If temperature is active.).

Note: Verify the firmware levels by reviewing the Repair Test Specifications document.

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2.1 Intent of Manual and Product Scope.

This manual provides technical service and re-calibration information to technicians authorized to
repair and recalibrate Welch Allyn, Inc. products. When used in conjunction with the required test
equipment and tools, technicians will be able to diagnose, repair, and recalibrate, and test the Spot
Vital Signs.

The manual includes: Re-calibration instructions, fault/cause analysis, step by step disassembly and re­assembly procedures, repair, adjustment, and re-test procedures.

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2.2 Test Equipment Bench Layout:

Figure 2.2 depicts recommended layout of test equipment and special tools for service and re­calibration of the Spot Vital Signs.

500 CC 250 CC 100 CC DMM Power DMM
Volume Volume Volume Voltage Supply Current

+ - + - + -

Setra Meter
Or
Netech Meter

To black wire To red wire
Connect To Power
of the Spot Check
Device

2” Tubing

3” Tubing
4” Tubing
15” Tubing

Welch Allyn Spot Device
10” Tubing 3” Tubing
To the Spot Vital Signs To Bulb and Valve

Nellcor Diatek PC, IBM Comp. 486
Patient Calibrator 133 MHz, 8 Mb RAM
Simulator 9600 Windows 95 OS
SRC-2

FIGURE 2.2

BENCH LAYOUT FOR RE-CALIBRATING AND TESTING SPOT VITAL SIGNS

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2.3 Required Tools and Fixtures for Service

Special tools below can be ordered from Welch Allyn, Inc.

DESCRIPTION TOOL #

100cc TEST VOLUME T112819
250cc TEST VOLUME T112818
500cc TEST VOLUME T112854
DIGITAL TIMER 8456T12
PLIERS T112458
BULB AND VALVE 5088-01
WIRE CUTTERS T112486
TWEEZERS T112511
PNEUMATIC TUBING (3 ea.) 5089-12
"Y" FITTING 9586TPK4
"T" FITTING (3) 9585TPK4
TEST CABLE (IR) 66P824
TEST CABLE (Service Cable Kit) 66S553
PNEUMATIC CLAMPS (3) 21730-001
TORQUE SCREWDRIVER T112917
TORQUE SCREWDRIVER T112918
TORQUE DRIVER T112918A
CUSTOM REPAIR SOFTWARE 130S57
#4 PHILLIPS BIT T112919
T10 TORX BIT T114030
3/8 HEX SOCKET T114135
CABLE TIE TOOL T112845
DIATEK 9600 CALIBRATOR 01800-210
DIATEK CAL. KEY 06137-000
NELLCOR PATIENT SIMULATOR SRC-2
NELLCOR TEST CABLE EC-8
SERVICE MANUAL 4200-145E

DIGITAL PRESSURE METERS

SETRA METER (0-10 PSIG) 2270-01
NETECH METER 200-2000IN
Notes: The entire set of equipment listed above can be ordered through Welch Allyn by the following
number: Eleckit
A Setra Meter (2270-01) or a Netech Meter (200-2000 IN) must to be ordered along with the Eleckit.
Individual equipment numbers can be ordered by themselves.
NO DISCOUNTS

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2.4 Required Tools and Fixtures for Service

The following equipment is need for service/repair and can not be obtained from Welch Allyn, Inc.

- IBM compatible 486 133 MHz computer or better. The computer must have Windows 95 with a
serial port. CPU must have 8 Megabytes of RAM.

- 2 Digital Multi-Meters. These meters must have 4 1/2 digit displays for accuracy.

- Power Supply. 0-20 Vdc adjustable with 0-3A output.

- Oscilloscope. 60 MHz minimum.

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2.5-Replacement Parts :

Drawing Number

Part # Description

Reference*

1 421100-502 Main PCB
2 421030 Flex Cable; Main to Display
3 421023-501 Pump Sub-assembly
4 421045 IR Window
5 421020-501 Display Module
6 421002-501 Battery Assembly
7 421029 Cable Assembly (Power)
8 421040 Rear Housing

9 421049-502 Front Housing Assembly
10 421044 Temperature Pod Housing
11 421048 SpO2 Cover
12 421042 Battery Cover
13 421047 SpO2 Latch
14 421009 Key Pad
15 421105-501 Temperature Assembly PCB
16 125S222 Nellcor SpO2 PCB
17 421099 Cable Assembly (pump/valve - Pneutronics

Valve)
18 121S106 Pneutronics Valve
19 421066 Flex Cable, Temperature to Main PCB
20 421001-502 Pneumatic Assembly

* - Numbers corresponding to the parts shown in the exploded view drawing in section 6.

2.6-Supplies and Accessories:

The following parts can be purchased by the end user as well as the authorized repair sites.

Blood Pressure Accessories And Supplies- Latex Free
Cuff and Bag Combination

5200-01 Adult (cuff, bladder and connector)
5200-02 Large Adult (cuff, bladder and connector)
5200-03 Small (cuff, bladder and connector)
5200-10 Thigh (cuff, bladder and connector)

Durable One-Piece Cuff

5200-13 Small Child (one-piece cuff and connector)
5200-14 Child (one piece cuff and connector)

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