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
Date ECN#/
ECO#
8/31/00 A Introduction of Aneroid
5/15/01 B Corrected tolerance levels in
8/18/03 5-46368 C Correction of tooling part
5/27/04 1000873 D Corrected BOM, tooling and
Revision Description Author Approved
JDB
Service Manual
JDB
the gauge tests sections.
Corrected m inor gramm atical
errors.
WWR DLK
numbers. Arden document
release to SKF.
BSW RJS
procedures.
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 (315)-685-3361
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 (+1) 305-669-9591
European Call Center (+353) 469-067-790 United Kingdom 0-207-365-6780
France (+33) 1-60-09-33-66 Germany (+49) 7477-927-173
Canada 1-800-561-8797 South Africa (+27) 11-777-7509
Australia (+61) 2-9638-3000 Singapore (+65) 6291-0882
Japan (+81) 3-5212-7391 China (+86) 21-6327-9631
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
Cross Shaft
Figure 1-1. New style S&K Movement.
Adjustment PinPinion
Service Manual 95P504 Rev. D Welch Allyn Aneroid Sphygmomanometers 5
Section 1 General Information
A
A
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.
BOTTOM PLATE
ND BEARING PLATE
TapTite
Screw
TOP PLATE
AND JEWELS
ASSEMBLY
(JEWEL VERSION)
Pinion
Hair
Spring
ASSEMBLY
ARBOR AND GEAR
SECTOR ASSY
Radius Plate
nd Push Rod
Assembly
Screw &
Washer
Top
Plate
Sector Alignment
Mark
Stop Lug
Leaf Spring
Figure 1-2. Old style aneroid movement.
Bottom
Plate
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
Service Manual 95P504 Rev. D Welch Allyn Aneroid Sphygmomanometers 9
Tools Required for Service
Service Section 2
Tool Number Description Old Style
Economy
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
Old Style
Pocket
Old Style
Hand
Old Style
509
Old Style
7670
TR-2 TR-1 S&K
Hand
S&K
Pocket
S&K
509
S&K
7670
10 Welch Allyn Aneroid Sphygmomanometers Service Manual 95P504 Rev. D
Tool Number Description Old Style
Economy
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
Tool Number Description Old Style
Economy
5088-01 Bulb and Valve X X X X X X X
Gomco 300 or
equivlant∗∗∗∗
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)
Suction Pump (Must be able to
pull a suction of -20 mmHg)
Old Style
Pocket
Old Style
Pocket
Old Style
Hand
Test equipment
Old Style
Hand
Old Style
509
Old Style
509
Old Style
7670
Old Style
7670
TR-2 TR-1 S&K
Hand
TR-2 TR-1 S&K
Hand
X X X X X X
S&K
Pocket
S&K
Pocket
S&K
509
S&K
509
S&K
7670
S&K
7670
Section 2 Service
Service Manual 95P504 Rev. D Welch Allyn Aneroid Sphygmomanometers 11
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
Service Section 2
500 cc Volume
Figure 2-1. Test Equipment Bench layout.
Gauge
Under
Test
Digital
Pressure
Meter
Bulb and Valve
12 Welch Allyn Aneroid Sphygmomanometers Service Manual 95P504 Rev. D
Section 2 Service
Repair and Calibration Section 3
Classic Pocket Aneroid Gauges
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.
(Date stamp of September 2003 or earlier)
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
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