Welch Allyn Aneroid Sphygmomanometer Service manual

Service Manual

Aneroid Sphygmomanometers

	Welch Allyn, Inc.
	4341 State Street Road
	P.O. Box 220
	Skaneateles Falls, NY 13153-0220
95P504 Rev. D	Copyright 2001

-

Revision Information

D a te	E C N # /	R e v isio n	D e sc rip tio n	A u th o r	A p p ro v e d
	E C O #
8 /3 1 /0 0		A	In tro d u c tio n o f A n e ro id	JD B
			S e rv ic e M a n u a l
5 /1 5 /0 1		B	C o rre c te d to le ra n c e le v e ls in	JD B
			th e g a u g e te sts se c tio n s .
			C o rre c te d m in o r g ra m m a tic a l
			e rro rs .
8 /1 8 /0 3	5 -4 6 3 6 8	C	C o rre c tio n o f to o lin g p a rt	W W R	D L K
			n u m b e rs . A rd e n d o c u m e n t
			re le a se to S K F .
5 /2 7 /0 4	1 0 0 0 8 7 3	D	C o rre c te d B O M , to o lin g a n d	B S W	R JS
			p ro c e d u re s .

Drawings and/or illustrations and/or part numbers in this document are for reference only. For the most current revision call the Welch Allyn Customer Service phone number listed in Section 1.

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers i

ii Welch Allyn Aneroid Sphygmomanometers

95P504 Rev. D

	Table of Contents
Section 1	General Information
To Service Personnel .....................................................................................................................		1
Intent of Manual and Product Scope .............................................................................................		1
Limited Warranty .........................................................................................................................		2
Warranty, Service, and Spare Parts ...............................................................................................		2
Warranty Service ...........................................................................................................................		2
Assistance and Parts ......................................................................................................................		2
Repairs ..........................................................................................................................................		3
Packing Instructions ......................................................................................................................		3
Periodic Calibration Requirements ................................................................................................		3
New S&K Movement ...................................................................................................................		5
Old Style Movements ....................................................................................................................		6
Section 2	Service
Tools Required for Service ............................................................................................................		9
Test Specifications .........................................................................................................................		11
Test Equipment Bench Layout ......................................................................................................		11
Section 3	Repair and Calibration
Classic Pocket Aneroid Gauges (Date stamp of September 2003 or earlier) ..............................................		13
Initial Gauge Check 13
Opening/Removing and Replacing Parts of the Classic Pocket Gauge ...........................................		13
Calibration of the Classic Pocket Gauge .......................................................................................		13
Aligning Sector Gear on the Classic Pocket Gauge ........................................................................		13
Setting the Classic Pocket Gauge Tension .....................................................................................		14
Setting the Classic Pocket Gauge Span ..........................................................................................		14
Check and finish the calibration of the Classic Pocket Gauge .......................................................		14
Classic Pocket Aneroid Gauges (Date stamp of October 2003 or later) ...................................................		16
Initial Gauge Check ......................................................................................................................		16
Opening/Removing and Replacing Parts of the Classic Pocket Gauge ...........................................		16
Calibration of the Classic Pocket Gauge .......................................................................................		16
Checking the Classic Pocket Gauge Span ......................................................................................		16
Average Zero Starting Position .....................................................................................................		17
Span Adjustment of the Classic Pocket Aneroid ............................................................................		17
Linearity Adjustment of the Classic Pocket Aneroid (As required) ................................................		18
High Readings of the Classic Pocket Aneroid: (Predominantly at 250 and 200) ....................................		18
Check and finish the calibration of the Classic Pocket Gauge .......................................................		19
Testing the Classic Pocket Gauge ..................................................................................................		19
Classic Wall and Mobile Aneroid Gauge (Date stamp of July 2003 or earlier) .......................................		21
7670 series Wall and Mobile Aneroid Disassembly .......................................................................		21
Classic Wall and Mobile Aneroid Disassembly .............................................................................		21
Calibration of the Wall and Mobile Gauge ...................................................................................		21
Sector Gear Alignment for the Wall and Mobile Aneroid ..............................................................		21
Setting the Tension of the Wall and Mobile Aneroid .....................................................................		22

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers iii

Table of Contents
Setting the span of the Wall and Mobile Aneroid ..........................................................................	22
Check and finish calibration of the Wall and Mobile Aneroid ......................................................	22
Classic Wall and Mobile Aneroid Gauge (Date stamp of October 2003 and later.) .................................	24
7670 series Wall and Mobile Aneroid Disassembly .......................................................................	24
Classic Wall and Mobile Aneroid Disassembly .............................................................................	24
Calibration of the Wall and Mobile Gauge ...................................................................................	24
Checking the Wall/Mobile Gauge Span .........................................................................................	24
Average Zero Starting Position .....................................................................................................	25
Span Adjustment of the Wall Aneroid ...........................................................................................	25
Check and finish calibration of the Wall and Mobile Aneroid ......................................................	27
Classic Hand Aneroid Gauge (Date stamp of September 2003 or earlier) ................................................	29
Replacing Parts of the Hand Gauge ..............................................................................................	29
Calibration of the Classic Hand Gauge .........................................................................................	29
Aligning the Sector Gear on the Classic Hand Gauge ....................................................................	30
To set the tension of the Classic Hand Gauge ...............................................................................	30
Setting the span of the Classic Hand Gauge ..................................................................................	30
Check and finish calibration of the Classic Hand Gauge ...............................................................	31
Testing of the Classic Hand Gauge ...............................................................................................	31
Test Specifications .........................................................................................................................	31
Classic Hand Aneroid Gauge (Date stamp of October 2003 or later) ......................................................	32
Replacing Parts of the Classic Hand Gauge ...................................................................................	32
Calibration of the Classic Hand Gauge .........................................................................................	32
Checking the Classic Hand Gauge Span ........................................................................................	32
Average Zero Starting Position .....................................................................................................	33
Span Adjustment of the Classic Hand Aneroid ..............................................................................	33
Linearity Adjustment of the Classic Hand Aneroid: (As required) .................................................	34
Check and finish the calibration of the Classic Hand Gauge .........................................................	35
Economy Aneroid Gauge (Stopped production on 7/15/03) ..................................................................	37
Replacing Parts of the Economy Gauge .........................................................................................	37
Calibration of the Economy Gauge ...............................................................................................	37
Aligning the Sector Gear of the Economy Gauge ...........................................................................	37
Setting the tension of the Economy Gauge ....................................................................................	37
Setting the span of the Economy Gauge ........................................................................................	38
Check and finish calibration of the Economy Gauge .....................................................................	38
Testing of the Economy Gauge 39
TR-1 Silver Ring Hand Aneroid ....................................................................................................	40
Replacing Parts of the Silver Ring .................................................................................................	40
Calibration of the Silver Ring Hand Aneroid ................................................................................	40
Checking the Silver Ring Gauge Span ...........................................................................................	40
Average Zero Starting Position .....................................................................................................	41
Span Adjustment of the Silver Ring Aneroid .................................................................................	41

iv Welch Allyn Aneroid Sphygmomanometers

95P504 Rev. D

	Table of Contents
Linearity Adjustment of the Silver Ring Aneroid: (As required) ....................................................		41
Check and finish the calibration of the Silver Ring Gauge .............................................................		43
TR-2 Pro Check Hand Aneroid ....................................................................................................		44
Replacing Parts on Pro Check Hand Aneroid ................................................................................		44
Calibration of the Pro Check Hand Aneroid .................................................................................		44
Checking the Pro Check Hand Gauge Span ..................................................................................		44
Average Zero Starting Position .....................................................................................................		44
Span Adjustment of the Pro Check Hand Aneroid ........................................................................		45
Linearity Adjustment of the Pro Check Hand Aneroid: (As required) ...........................................		45
High Readings of the Pro Check Aneroid: (Predominantly at 250 and 200) ..................................		45
Check and finish the calibration of the Pro Check Hand Gauge ....................................................		47
Section 4	Repair Parts
Old Style Classic Pocket Repair Parts ............................................................................................		49
Old Style Classic Hand Repair Parts .............................................................................................		50
Old Style 767 Wall Repair Parts ...................................................................................................		51
Old Style Classic Wall/Mobile Repair Parts ..................................................................................		52
Economy Aneroid Repair Parts .....................................................................................................		53
TR1 Silver Ring Repair Parts ........................................................................................................		54
TR2 Pro Check Repair Parts .........................................................................................................		55
S&K Classic Pocket Repair Parts .................................................................................................		56
S&K Classic Hand Repair Parts ....................................................................................................		57
S&K Wall/Mobile Series 509 Repair Parts ....................................................................................		58
S&K WalL 767 Series Repair Parts ...............................................................................................		59

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers v

General Information	Section 1

To Service Personnel

The information contained in this publication 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. 1-800-535-6663 315-685-4100

Fax [phone]

Welch Allyn, Inc.

4341 State Street Road

Skaneateles Falls, NY 13153-0220

USA

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.

Only Authorized Welch Allyn personnel or agents must perform all service and repairs, using approved Welch Allyn replacement parts and approved process materials. Failure to follow these guidelines will invalidate the product warranty. Please refer to the product warranty for specific coverage.

Intent of Manual and Product Scope

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

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

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers 1

Section 1	General Information

Limited Warranty

Welch Allyn, Inc. warrants the Aneroid Sphygmomanometers when new, to be free of defects in material and workmanship and to perform in accordance with manufacturer's specifications for a period of (see Table 1-1) 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 your nearest Welch Allyn Technical Support Center.

Warranty, Service, and Spare Parts

Warranty Service

All repairs on products under warranty must be performed or approved by Welch Allyn. Unauthorized repairs will void the warranty. In addition, whether or not covered under warranty, any product repair shall exclusively be performed by Welch Allyn trained and certified service personnel.

Assistance and Parts

If the product fails to function properly or if assistance, service, or spare parts are required, contact the nearest Welch Allyn Technical Support Center.

USA 1-800-535-6663	Latin America ([phone]
European Call Center ([phone]	United Kingdom 0-207-365-6780
France ([phone]	Germany ([phone]
Canada 1-800-561-8797	South Africa ([phone]
Australia ([phone]	Singapore ([phone]
Japan ([phone]	China ([phone]

Before contacting Welch Allyn it is helpful to attempt to duplicate the problem and to check all accessories to ensure that they are not the cause of the problem.

2 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D

General Information	Section 1

When calling, please be prepared to provide:

•The product name, model number and complete description of the problem

•The serial number of your product (if applicable)

•The complete name, address and phone number of your facility

•For out-of-warranty repairs or spare parts orders, a purchase order (or credit card) number

•The required spare or replacement part number(s), for parts order

Repairs

If your product requires warranty, extended warranty, or non-warranty repair service, first call the nearest Welch Allyn Technical Support Center. A representative will assist you in troubleshooting the problem and will make every effort to solve the problem over the phone, avoiding a potential unnecessary return.

In case the return cannot be avoided, the representative will record all necessary information and will provide a Return Material Authorization (RMA) number, as well as the appropriate return address.

A Return Material Authorization (RMA) number must be obtained prior to any return. Be sure to note this number on the outside of your shipping box.

Packing Instructions

If you have to return goods for service, follow these recommended packing instructions:

•Remove all hoses, and ancillary products (as appropriate) before packing, unless you suspect they are associated with the problem.

•Wherever possible use the original shipping carton and packing materials.

•Include a packing list and the Welch Allyn Return Material Authorization (RMA) number.

•Be sure to note the (RMA) number on the outside of your shipping box.

It is recommended that all returned goods be insured. Claims for loss or damage to the product must be initiated by the sender.

Periodic Calibration Requirements

Welch Allyn sphygmomanometers are manufactured to high standards for quality and accuracy. The instruments are manufactured using calibrated pressure standards traceable to the National Institute of Standards and Technology.

During normal operation, the location of the pointer within the oval/square indicates that the instrument is most likely in calibration. Should the pointer rest outside the oval/box with zero pressure applied, the instrument should be re-calibrated.

Welch Allyn recommends that the calibration of mechanical sphygmomanometers be checked using the following procedures on an annual basis even if the pointer rests inside the oval/box.

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers 3

Section 1	General Information

1.Connect the instrument under test to a high-quality, known pressure standard (traceable to the National Institute of Standards and Technology) and a 500 cc test volume.

2.Pressurize the gauge to slightly above 300 mmHg and bleed down the pressure no faster than 10 mmHg per second, stopping to check the pressure at 300, 250, 200, 150, 100, 60, and 0 mmHg.

3.Record the readings of the instrument under test and the applied pressure. The difference is the error of the instrument. The error of the reference pressure should be added to the specified accuracy of the instrument under test (±3 mmHg) to determine the working accuracy of your calibration set-up.

NOTE: Your ability to measure the accuracy of a sphygmomanometer depends upon the sensitivity of the pressure standard you use for the calibration procedure.

Example: If using a device (e.g., digital pressure standard) rated at ±0.1 mmHg, you will be able to determine the accuracy of the gauge being tested to within ±3.1 mmHg. Welch Allyn recommends using a pressure standard that is as sensitive as possible when performing calibration checks. A Setra Pressure Meter (part no. 2270-01), which is calibrated for ±0.1 mmHg, or Netech Pressure Meter (part no. 200-2000IN), which is calibrated for ±1.0 mmHg, work well for this application.

4 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D

General Information	Section 1

New S&K Movement

The S&K movement is now being used in all Classic Hand Aneroid, Classic Pocket Aneroid, Wall Aneroid Series 509, Wall Aneroid Series 767, TR1 Silver Ring and TR2 ProCheck aneroids. The S&K movement looks similar to Figure 1-1. Please familiarize yourself with the different parts of the S&K movement.

Sector Gear

Pinion

Adjustment Pin

Cross Shaft

Figure 1-1. New style S&K Movement.

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers 5

Section 1	General Information

Old Style Movements

Welch Allyn still supports the Older Style Classic Hand Aneroid, Classic Pocket Aneroid, Wall Aneroid Series 509 and Wall Aneroid Series 767. The Older movements look similar to Figure 1-2.

TapTite

Screw

TOP PLATE AND JEWELS ASSEMBLY

(JEWEL VERSION)

Pinion

Hair

Spring

ARBOR AND GEAR

SECTOR ASSY

Radius Plate

And Push Rod

Assembly

Screw &

Washer

BOTTOM PLATE

AND BEARING PLATE

ASSEMBLY

Top

Plate Bottom

Plate

Sector Alignment

Mark

Stop Lug

Leaf Spring

Figure 1-2. Old style aneroid movement.

6 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D

General Information					Section 1
			Table 1-1. Aneroid warranty table.
Model		Model No.	Description	Warranty	Comments
Classic Hand Aneroid		5098-06	w/Infant Cuff	Lifetime	Replace w/S&K Assy.
		5098-05	w/Adult Cuff	Lifetime	Replace w/S&K Assy.
		5098-02	w/Child Cuff	Lifetime	Replace w/S&K Assy.
		5098-20	w/Various Size Cuffs	Lifetime	Replace w/S&K Assy.
		5098-23	w/Various Size Printed Cuffs	Lifetime	Replace w/S&K Assy.
		5098-18	w/Various Printed Ped Cuffs	Lifetime	Replace w/S&K Assy.
Classic Pocket Aneroid		5090-06	w/Child Cuff	Lifetime	Replace w/S&K Assy.
		5090-02	w/Adult Cuff	Lifetime	Replace w/S&K Assy.
		5090-41	w/Lg. Adult Cuff	Lifetime	Replace w/S&K Assy.
		5090-37	w/Thigh Cuff	Lifetime	Replace w/S&K Assy.
Wall Aneroid Series 509		5091-38	w/Adult Cuff	Lifetime	Replace w/S&K Assy.
		5091-22	w/Adult Cuff & Orange Scale	Lifetime	Replace w/S&K Assy.
		5091-60	w/5 legged stand	Lifetime	Replace w/S&K Assy.
		5091-41	w/4 legged stand
Wall Aneroid 767 Series		7670-01	w/Adult Cuff	Lifetime	Replace w/S&K Assy.
TR1 (Siler Ring) Hand Aneroid		5098-29	w/Child Cuff	10 year	No Change
		5098-27	w/Adult Cuff	10 year	No Change
		5098-28	w/Lg. Adult Cuff	10 year	No Change
		5098-30	w/Various Size Printed Cuffs	10 year	No Change
TR2 (Procheck) Hand Aneroid		5098-72	w/Child Cuff	5 year	No Change
		5098-70	w/Adult Cuff	5 year	No Change
		5098-71	w/Lg. Adult Cuff	5 year	No Change
		5098-73	w//Various Size Printed Cuffs	5 year	No Change
Durashock		DS45-09	w/Child Cuff	10 year	No Change
		DS45-09P	w/Printed Child Cuff	10 year	No Change
		DS45-10	w/Sm. Adult Cuff	10 year	No Change
		DS45-11	w/Adult Cuff	10 year	No Change
		DS45-12	w/Lg. Adult Cuff	10 year	No Change
Durashock		DS44-09	w/Child Cuff	5 year	No Change

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers 7

	Section 1				General Information
Model		Model No.	Description	Warranty	Comments
		DS44-09P	w/Printed Child Cuff	5 year	No Change
		DS44-10	w/Sm. Adult Cuff	5 year	No Change
		DS44-11	w/Adult Cuff	5 year	No Change
		DS44-12	w/Lg. Adult Cuff	5 year	No Change
Arden Wall Aneroid		Arden-W01	Gage & Cuff	5 year	No Change
		Arden-W02	Gage Only	5 year	No Change
Arden Pocket Aneroid		Arden-G01	w/Adult Cuff	5 year	No Change
		Arden-G02	w/Lg. Adult Cuff	5 year	No Change
		Arden-G03	w/Child Cuff	5 year	No Change
		Arden-G04	Gage Only	5 year	No Change
Economy Pocket Aneroid		7050-23	w/Child Cuff	10 year	Discontinue selling after 7/15/2003
		7050-14	w/Adult Cuff	10 year	Discontinue selling after 7/15/2003
		7050-24	w/Lg. Adult Cuff	10 year	Discontinue selling after 7/15/2003
		7050-43	w/Thigh Cuff	10 year	Discontinue selling after 7/15/2003
Mercurial		5097-30	Desk	10 year	Discontinued selling after 3/15/2003
		5097-29	w/Mobile Stand	10 year	Discontinued selling after 3/15/2003
		5097-26	w/Wall Mount	10 year	Discontinued selling after 3/15/2003
		5097-11	w/Wall Mount & Orange Scale	10 year	Discontinued selling after 3/15/2003

8 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D

D .Rev 95P504 Manual Service

9 Sphygmomanometers Aneroid Allyn Welch

Tools Required for Service

Tool Number

Description

Old Style

Old Style

Old Style

Old Style

Old Style

TR-2

TR-1

S&K

S&K

S&K

S&K

Economy

Pocket

Hand

509

7670

Hand

Pocket

509

7670

Local Tool Store

Tweezers

X

Local Tool Store

Jewelers Screwdriver

X

X

X

Local Tool Store

3/8" Open End Wrench

X

Local Tool Store

Pliers to Grip Luer

X

Local Tool Store

5/16" Open End Wrench

X

T112854

500cc Volume

X

X

X

X

X

X

X

X

X

X

X

T106763

509/7670 Fixture

X

X

X

X

T18891

Adapter for Torque wrench

X

X

X

X

X

X

T110657

Calibration Dial

X

T112663

Calibration Dial

X

T112949

Calibration Dial

X

T18781

Calibration Dial

X

X

T18833

Calibration Dial

X

X

T19036

Calibration Dial

X

T105721

Calibration Dial

X

X

T106845A

Calibration Tool

X

X

X

X

X

T18816

Calibration Tool (S+K)

X

X

X

X

X

X

T105644

Collet

X

T108212

Economy Gauge Fixture

X

T107569

Hand Gauge Fixture

X

X

T108897

Movement Removal Wrench

X

X

X

T74555

Pocket Gauge Fixture

X

X

T55804-1

Pocket Screw Cap Assy.

X

T19034

Pointer Assembly Tool

X

X

X

X

X

X

T34935

Pointer Block

X

X

X

X

T18814

Pointer Removal Tool

X

X

X

X

X

X

X

X

X

X

X

T19035

S&K removal Wrench

X

X

X

X

X

X

T113249

Screw Cap Removal Tool

X

T107345

Span Wrench

X

T119628

Tension Setting Tool

X

X

X

X

X

T113265

Thumbscrew Wrench

X

X

T112655

Top Plate Wrench

X

X

X

X

T112459

Torque Screwdriver

X

X

X

X

Service

2 Section

Sphygmomanometers Aneroid Allyn Welch 10

D .Rev 95P504 Manual Service

Tool Number

Description

Old Style

Old Style

Old Style

Old Style

Old Style

TR-2

TR-1

S&K

S&K

S&K

S&K

Economy

Pocket

Hand

509

7670

Hand

Pocket

509

7670

T18904

Torque Wrench (S & K)

X

X

X

X

X

X

T112584

TR-1 & TR-2 Fixture

X

X

T105258

Wrench

X

X

X

Local Tool Store

Red Loctite #266

X

X

X

X

X

X

X

X

X

X

X

Local Tool Store

3M Plastic Adhesive #1099

X

Test equipment

Tool Number

Description

Old Style

Old Style

Old Style

Old Style

Old Style

TR-2

TR-1

S&K

S&K

S&K

S&K

Economy

Pocket

Hand

509

7670

Hand

Pocket

509

7670

5088-01

Bulb and Valve

X

X

X

X

X

X

X

Gomco 300 or

Suction Pump (Must be able to

X

X

X

X

X

X

equivlant

pull a suction of -20 mmHg)

9585TPK4

"T" Fitting

X

X

X

X

X

X

X

X

X

X

X

9586TPK4

"Y" Fitting

X

X

X

X

X

X

X

X

X

X

X

97P24

Pneumatic Tubing (4ft.)

X

X

X

X

X

X

X

X

X

X

X

200-2000in

Netech Digital Pressure Meter

X

X

X

X

X

X

X

X

X

X

X

2270-01

Setra Digital Pressure Meter

X

X

X

X

X

X

X

X

X

X

X

Local Tool Store

Torque Bit size T5

X

X

X

X

NOTE: Only one of the pressure meters are needed. The user can choose which will work best for them.

Order from Netech (800-547-6557)

Order from Setra (800-257-3872)

Order from Festo (704-527-1427)

Order from PMED (303-393-7800)

2 Section

Service

D .Rev 95P504 Manual Service

11 Sphygmomanometers Aneroid Allyn Welch

Test Specifications

The following are the pressure test points that each gauge must be tested to after any repair is made.

1.The gauge must be accurate to within ±3 mmHg at the following test pressures:

a)0 mmHg (pointer inside the oval/rectangle)

b)60 mmHg

c)100 mmHg d)150 mmHg e)200 mmHg f)250 mmHg g)300 mmHg

Note: Calibration of all gauges must be performed using a Calibrated Digital Pressure Meter, traceable to NIST standards, as the pressure standard, to ensure complete accuracy.

Test Equipment Bench Layout

Digital 500 cc Volume Pressure

Meter

Gauge

Under Bulb and Valve

Test

Figure 2-1. Test Equipment Bench layout.

Service

2 Section

Section 2		Service

12 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D

Repair and Calibration	Section 3

Classic Pocket Aneroid Gauges (Date stamp of September 2003 or earlier)

Initial Gauge Check

1.Before performing calibration:

a)Check the clip for correct tension. Replace before calibration.

b)Ensure the lock nut is tight.

c)Check the hair spring. Ensure that the hair spring is uniform and not distorted.

d)Check the pinion. Ensure that it rotates correctly and is not bent.

Opening/Removing and Replacing Parts of the Classic Pocket Gauge

2.Place the pocket gauge into the Pocket Gauge Fixture (T74555).

3.Remove the bezel by unscrewing it from the case. Remove the crystal.

4.Remove the pointer, using the pointer removal tool (T18814).

5.Pry out the dial, using a small flat head screwdriver.

6.Remove the capsule locking nut using span wrench (T107345).

7.Remove the screw cap, using (T113249). Remove the capsule.

Note: The arm of the movement fits into the top of the capsule.

8.Remove the 2 screws that are holding down the gauge movement using (T108897).

Note: Some units will use phillip head screws to secure the movement.

9.Remove the movement.

Note: Reassemble in reverse order.

Calibration of the Classic Pocket Gauge

10.Connect the gauge to test equipment.

11.Place the gauge in to the pocket fixture (T74555).

12.Remove the bezel, crystal, pointer and dial.

Aligning Sector Gear on the Classic Pocket Gauge

13.View the sector gear and ensure that it is in the proper position. The right edge of the sector gear should align with the mark on the base of the movement.

14.If the sector gear is not aligned properly, loosen the capsule nut using (T107345). Adjust the sector gear by turning the capsule until the sector gear is in the correct position per step #13. Tighten the capsule nut.

Service Manual 95P504 Rev. D

Welch Allyn Aneroid Sphygmomanometers 13

Section 3	Repair and Calibration

Setting the Classic Pocket Gauge Tension

15.Loosen the sector stop lug and pull it towards the bottom of the gauge.

16.Using your left index finger, push the sector gear all the way to the post and hold in that position.

17.Place the tension setting tool (T119628) onto the pinion at the 9 o’clock position.

18.Rotate the tension setting tool clockwise to the 5 o’clock position.

19.Release the sector gear and continue rotating the tension setting tool to the 9 o’clock position. The sector gear should be moving during this step.

20.Bring the sector stop lug back to correct position and lock it into place.

Setting the Classic Pocket Gauge Span

21.Place the test dial (T105721) onto the gauge. Place the test pointer onto the pinion. Rotate the test dial until the pointer is at "0".

22.Apply 320 mmHg to the gauge.

23.Release the pressure to 300 mmHg.

24.If the pointer is pointing to less than "300", place the calibration tool (T106845A) into the radius plate slot above the screw. Rotate the calibration tool counter clockwise towards the bottom of the gauge until the test pointer reaches "300". Release the pressure to 0 mmHg and check at the "0" point.

25.If the test pointer is pointing to greater than "300", position the calibration tool (T106845A) between the sector gear and the radius plate. Rotate the tool clockwise until the pointer is at "300" (this brings the radius plate down). Release the pressure to 0 mmHg and check the "0" point.

26.If the pointer is not at "0" upon full release of pressure, rotate the test dial until the test pointer is on the "0" mark of test dial. Repeat steps 22-25 until span is set.

27.Check for leaks by pinching off the tubing from the test equipment while pressure is applied to the gauge. There should be no leakage or movement of the pointer.

Check and finish the calibration of the Classic Pocket Gauge

28.Remove the test pointer and test dial. Replace the gauge’s dial.

29.Apply a small amount of red Loctite #266 to the hub of the pointer. Place the gauge’s pointer onto the pinion. Ensure that it is resting in the center of the oval/square. Gently tap the pointer with a small hammer to secure.

14 Welch Allyn Aneroid Sphygmomanometers

Service Manual 95P504 Rev. D