Service Manual
67 Pages
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Page 1
Service Manual
Aneroid Sphygmomanometers
95P504 Rev. D
Welch Allyn, Inc. 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Copyright 2001
Revision Information
D a te
ECN #/ ECO#
R e v isio n
8 /3 1 /0 0
A
5 /1 5 /0 1
B
8 /1 8 /0 3
5 -4 6 3 6 8
C
5 /2 7 /0 4
1000873
D
D e sc rip tio n
A u th o r
In tro d u c tio n o f A n e ro id S e rv ic e M a n u a l C o rre c te d to le ra n c e le v e ls in 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. C o rre c tio n o f to o lin g p a rt 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 . C o rre c te d B O M , to o lin g a n d p ro c e d u re s.
A p p roved
JD B JD B
WWR
DLK
BSW
R JS
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
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
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. BOTTOM PLATE AND BEARING PLATE ASSEMBLY
TapTite Screw TOP PLATE AND JEWELS ASSEMBLY (JEWEL VERSION)
Pinion
Hair Spring
ARBOR AND GEAR SECTOR ASSY Top Plate
Bottom Plate
Radius Plate And Push Rod Assembly
Screw & Washer
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.
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.
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
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
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
DS44-09
w/Child Cuff
5 year
No Change
Classic Pocket Aneroid
Wall Aneroid Series 509
TR2 (Procheck) Hand Aneroid
Durashock
Durashock
Service Manual 95P504 Rev. D
Welch Allyn Aneroid Sphygmomanometers 7
Section 1 Model
Arden Wall Aneroid
Arden Pocket Aneroid
Economy Pocket Aneroid
Mercurial
General Information 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-W01
Gage & Cuff
5 year
No Change
Arden-W02
Gage Only
5 year
No Change
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
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
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
Description
Old Style Economy
Old Style Pocket
Old Style Hand
Old Style 509
Local Tool Store
Tweezers
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
T112854
500cc Volume
T106763
509/7670 Fixture
T18891
Adapter for Torque wrench
T110657
Calibration Dial
T112663
Calibration Dial
T112949
Calibration Dial
T18781
Calibration Dial
T18833
Calibration Dial
T19036
Calibration Dial
T105721
Calibration Dial
T106845A
Calibration Tool
T18816
Calibration Tool (S+K)
T105644
Collet
T108212
Economy Gauge Fixture
T107569
Hand Gauge Fixture
T108897
Movement Removal Wrench
T74555
Pocket Gauge Fixture
X
T55804-1
Pocket Screw Cap Assy.
X
T19034
Pointer Assembly Tool
T34935
Pointer Block
X
X
X
X
T18814
Pointer Removal Tool
X
X
X
X
T19035
S&K removal Wrench
T113249
Screw Cap Removal Tool
T107345
Span Wrench
T119628
Tension Setting Tool
T113265
Thumbscrew Wrench
T112655
Top Plate Wrench
T112459
Torque Screwdriver
Old Style 7670
TR-2
TR-1
S&K Hand
S&K Pocket
S&K 509
S&K 7670
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X
X
X X
X
X
X
X
X
X
X X X
X
X
X
X
X
X
X
X X
X
X
X
X X X X
X
X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X X
X
X
X
X
X
X
X X
X X X
X
Section 2
Welch Allyn Aneroid Sphygmomanometers 9
Tool Number
Service
Service Manual 95P504 Rev. D
Tools Required for Service
Description
Old Style Economy
Old Style Pocket
TR-2
TR-1
S&K Hand
S&K Pocket
S&K 509
S&K 7670
T18904 T112584
Torque Wrench (S & K)
X
X
X
X
X
X
TR-1 & TR-2 Fixture
X
X
T105258
Wrench
X
Local Tool Store
Red Loctite #266
X
Local Tool Store
3M Plastic Adhesive #1099
X
Tool Number
Description
5088-01
Bulb and Valve
Gomco 300 or equivlant∗∗∗∗
Suction Pump (Must be able to pull a suction of -20 mmHg)
9585TPK4∗∗∗
"T" Fitting
X
X
X
X
9586TPK4∗∗∗
"Y" Fitting
X
X
X
X
97P24
Pneumatic Tubing (4ft.)
X
X
X
200-2000in∗
Netech Digital Pressure Meter
X
X
X
2270-01∗∗
Setra Digital Pressure Meter
X
X
X
Local Tool Store
Torque Bit size T5
X
Old Style Hand
Old Style 509
Old Style 7670
X
X
X
X
X
X
X
X
X
X
Old Style 509
Old Style 7670
TR-2
TR-1
S&K Hand
S&K Pocket
S&K 509
S&K 7670
X
X
X
X
X
X
Section 2
10 Welch Allyn Aneroid Sphygmomanometers
Tool Number
Test equipment Old Style Economy
Old Style Pocket
X
X
Old Style Hand
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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)
Service
Service Manual 95P504 Rev. D
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
Service
Service Manual 95P504 Rev. D
Test Specifications
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 Pressure Meter
500 cc Volume
Bulb and Valve
Figure 2-1. Test Equipment Bench layout.
Section 2
Welch Allyn Aneroid Sphygmomanometers 11
Gauge Under Test
Section 2
12 Welch Allyn Aneroid Sphygmomanometers
Service
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
Repair and Calibration
Section 3
30. If the pointer is to the left of the oval/square’s center, rotate the pointer counter clockwise until you feel a slight resistance. Release the pointer. Ensure that the pointer returns to the center of the oval/square "0". Repeat until correct. 31. If the pointer is to the right of the oval/square’s center, rotate the pointer clockwise until a slight resistance is felt. Release the pointer. Ensure that the pointer returns to the center of the oval/square "0" each time. Repeat until correct. 32. Place the crystal and bezel back onto the gauge. Test the gauge. 33. Connect the gauge to the test equipment. 34. Apply 320 mmHg to the gauge. 35. Release the pressure to 300 mmHg. Note: The aneroid gauge must be accurate to "3 mmHg at the stated target pressures. Use a calibrated digital pressure meter. 36. Compare the reading of the calibrated digital pressure meter to that of the gauge under test. 37. The following are the pressure test points that each gauge must be tested to after any repair is made. 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 as the pressure standard for complete accuracy.
Service Manual 95P504 Rev. D
Welch Allyn Aneroid Sphygmomanometers 15