T.O. 33K6-4-3202-1

28 FEBRUARY 2005 CHANGE 1 - 30 MAY 2007

TECHNICAL MANUAL

CALIBRATION PROCEDURE

FOR

DIGITAL PRESSURE TRANSDUCER

470

(SETRA)

Distribution Statement C - Distribution authorized to U. S. Government agencies and their contractors for official use or for administrative or operational purposes only, 30 August 2000. Requests for this document shall be referred to 562 CBSG/GBHA, 813 Irving-Wick Dr W, Heath, OH 43056-1199. Destruction Notice - For unclassified, limited documents, destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

Published under Authority of the Secretary of the Air Force

Basic and all changes have been merged to make this a complete publication.

T.O. 33K6-4-3202-1 INSERT LATEST CHANGED PAGES. DESTROY SUPERSEDED PAGES. NOTE: The portion of the text and illustrations affected by the changes is indicated by a vertical

line in the outer margins of the page. Date of issue for original and changed pages are: Original......................0 ....................28 February 2005 Change.......................1 ...........................30 May 2007 TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 12, CONSISTING OF THE FOLLOWING: Page * Change Page * Change Page * Change No. No. No. No. No. No. Title ...................................1 A ........................................1 1 - 4....................................0 5 .........................................1 6 Blank...............................0 A-1.....................................0 A-2 Blank ..........................0 B-1 - B-2............................0

*Zero in this column indicates an original page

LIST OF EFFECTIVE PAGES

A Change 1 USAF

T.O. 33K6-4-3202-1

DIGITAL PRESSURE TRANSDUCER

470

(SETRA) 1 CALIBRATION DESCRIPTION:

Table 1. Test Instrument (TI) Performance Test Characteristics Specifications Method Pressure Range: 17.5 to 32.5 in Hg Compared to a Primary Pressure Standard Accuracy: ±0.054% of FS/yr *1

±(0.02% of FS *2 @70 °F after adjustment); Thermal Effects, span, ±0.001% per °F from compensated range 70 °F *1 Accuracy for 1 yr is RSS of manufacturers accuracy and stability. *2 Manufacturer specifications state FS, which is equivalent to ±0.02% of span for TI. 2 EQUIPMENT REQUIREMENTS: Minimum Use Calibration Sub- Noun Specifications Equipment Item 2.1 PRIMARY Range: 17 to 33 in Hg Ruska PRESSURE 2465-601-58500 STANDARD Accuracy: ±0.005% of ind 2.2 PRESSURE Range: 0 to 100 psi Ruska REGULATOR 3930-805 Accuracy: N/A 2.3 REGULATED Range: 0 to 100 psi Clean Dry Air or PRESSURE Nitrogen SOURCE Accuracy: N/A 2.4 VACUUM SOURCE Range: 200 microns RPC (2 EA) 4507A Accuracy: N/A 2.5 VACUUM GAGE Range: 0 to 200 microns Hastings VT6 Accuracy: ±10% of ind

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T.O. 33K6-4-3202-1

Minimum Use Calibration Sub- Noun Specifications Equipment Item 2.6 POWER SUPPLY Range: 0 to 5 VDC Hewlett-Packard 6214C Accuracy: ±1.0% of ind 2.7 HYPERTERMINAL Range: N/A Windows 95/98 PROGRAM or equivalent Accuracy: N/A 2.8 DIP SWITCH Range: N/A Local Manufacturer Accuracy: N/A 3 PRELIMINARY OPERATIONS: 3.1 Review and become familiar with the entire procedure before beginning the Calibration Process.

WARNING

Unless otherwise designated, and prior to beginning the Calibration Process, ensure that all test equipment voltage and/or current outputs are set to zero (0) or turned off, where applicable. Ensure that all equipment switches are set to the proper position before making connections or applying power.

WARNING

Each technician assembling high or low pressure lines for test purposes must be familiar with all applicable directives and safety precautions contained in applicable OSHA STD 127-66 and T.O. 00-25-223. It is recommended that a protective shield be used during the pressurization of all Test Instruments (TI) up to and including 500 psi and mandatory over 500 psi.

3.2 Place the TI in the Laboratory environment for at least 2 hours prior to start of calibration. 3.3 Connect a D-Subminature 9 pin male connector cable from the TI to the 5 VDC Power Supply with Pin 3 being negative (-) and Pin 9 positive (+). 3.4 With TI and test equipment connected to an appropriate power source, set POWER switches to ON and allow warm-up as required by manufacturer. 3.5 Connect a D-Subminature 9 pin female connector cable from the host computer to the TI.

NOTE

A null modem cable may be required, depending on the computer.

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T.O. 33K6-4-3202-1

3.6 Set up Windows HyperTerminal session configuration as follows: Bit per second: 2400 Data bits: 8 Parity: None Stop bits: 1 Flow control: None Start bit 1

NOTE The Default path for HyperTerminal is: C:/Program Files/Accessories/ HyperTerminal.

3.7 All commands are in capital letters. All commands to be transmitted to the TI will be bolded. 3.8 Start HyperTerminal session, transmit V to verify communications connection. 3.9 Transmit -8888S to perform Internal Diagnostics Test. 3.10 TI will respond D-NOS. 3.11 Transmit S. 3.12 TI will respond BUSY and will reply within 30 seconds PASS or ERR. TI must display PASS to proceed with calibration. If ERR is displayed, contact manufacturer for further instruction. 3.13 Transmit C, TI responds: SETRA DIGITAL PRESSURE TRANSDUCER MODEL 470 BUSY (TI will pause for 30 seconds, then display Verify Message) SETRA DIGITAL PRESSURE TRANSDUCER MODEL 470 17.7180 TO 32.4830 in Hg A 3.14 Make copies of Appendix B Worksheet as necessary. 3.15 Transmit P and record As Found Units in the Pressure Units As Found block on the Worksheet. 3.16 Throughout the calibration, it may be necessary to change pressure units. To change pressure units, transmit UP. Each time UP is transmitted, the TI will scroll to the next available pressure unit. Continue to transmit UP until the desired pressure unit is displayed.

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T.O. 33K6-4-3202-1

NOTE Ensure to return the TI to the As Found Units when calibration is complete.

4 CALIBRATION PROCESS:

NOTE

Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met, before proceeding.

4.1 ABSOLUTE PRESSURE CALIBRATION: 4.1.1 Connect equipment as shown in Figure 1. 4.1.2 Transmit 5P. 4.1.3 Exercise TI throughout entire range 3 times, ensure that full scale and zero indications are held for a minimum period of 20 seconds each time they are attained, then set system to atmospheric pressure. 4.1.4 Transmit -P. 4.1.5 Close Pressure Regulator Increase and Decrease valves.

*

*

PRESSURE REGULATOR

ATMOSPHEREVENT

VACUUMGAGE

PRIMARYPRESSURESTANDARD

TI

REGULATEDPRESSURESOURCE

VALVE A

VALVE B

VACUUM SOURCE #1

VACUUM SOURCE #2

EXH

IN TEST

TEST

TEST

(REAR)

ATMOSPHEREVENT

(FRONT)

* Below Atmospheric only.

VALVE C

Figure 1. 4.1.6 Adjust Regulated Pressure Source equal to or just above TI full scale pressure and energize Vacuum Source #1.

NOTE

Do not close valves beyond a lightly sealed position. 4.1.7 Select the proper Primary Pressure Standard Piston and Weights equal to the first value in the Applied column of Table 2. 4.1.8 Decrease the pressure to the first Applied value in Table 2.

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T.O. 33K6-4-3202-1

4.1.9 Install the Primary Pressure Standard Bell Jar and energize Vacuum Source #2. 4.1.10 Adjust Pressure Regulator until Primary Pressure Standard Piston floats at proper level while rotating. 4.1.11 Transmit 2P and wait for the TI stability indicator to display OK on HyperTerminal session. Record indication on Worksheet. Transmit -P to cancel reading command.

Table 2. Applied (in Hg) Limits (in Hg) 18 17.992 to 18.008 20 19.992 to 20.008 22 21.992 to 22.008 24 23.992 to 24.008 26 25.992 to 26.008 28 27.992 to 28.008 30 29.992 to 30.008 32 31.992 to 32.008 4.1.12 Repeat steps 4.1.7 through 4.1.11 for each remaining value in the Applied column of Table 2. 4.1.13 Repeat step 4.1.12 in a down scale direction. Record indications on Worksheet. 4.1.14 TI must indicate within the corresponding values listed in the Limits column of Table 2. If TI is out of tolerance then proceed to the Adjustment procedure in Appendix A. 4.1.15 Transmit P and record As Left Units in the Pressure Units As Left block on the Worksheet located in Appendix B. Ensure the As Found and the As Left data are in the same units. 4.1.16 Annotate the Certification Label with the As Left Pressure Units from step 4.1.15. 4.1.17 Vent all pressures to atmosphere. 4.1.18 Calibration Complete. Set all POWER switches to OFF, disconnect and secure all equipment.

CALIBRATION PERFORMANCE TABLE

Not Required

Change 1 5/(6 Blank)

T.O. 33K6-4-3202-1

APPENDIX A

A-1 ADJUSTMENT PROCESS: A-1.1 Connect equipment as in Figure 1. A-1.2 The calibration coefficients for the TI are stored internally. New coefficients can only be written when the Enable Switch on the digital electronics board is set to ON. The Enable Switch is located inside the round access hole in the TI case directly to the right of the communications port. To set the Enable Switch on, attach a dip switch or equivalent across the pins.

NOTE

This procedure can be aborted at any point by setting the Enable Switch to OFF and transmitting C, to execute the clear function.

A-1.3 With power applied to TI, set the Enable Switch to ON. A-1.4 Transmit SZ, for Setup Zero. A-1.5 Apply the indicated pressure from the Primary Pressure Standard. A-1.6 When the pressure is stable, Transmit S. TI will respond BUSY and will respond within 30 seconds PROTEC. A-1.7 Set enable switch to OFF. Transmit C. A-1.8 Set Enable Switch to ON. Transmit SF. A-1.9 The TI Responds with APPLY and a value. Apply the indicated value. A-1.10 When the pressure is stable, Transmit S. A-1.11 The TI will respond with APPLY and a Full Scale value. Apply the indicated value. A-1.12 When the pressure is stable, Transmit S. TI will respond BUSY and will respond within 30 seconds PROTEC. A-1.13 Set Enable Switch to OFF. Transmit C. A-1.14 Repeat steps 4.1.7 through 4.1.18 to verify calibration.

A-1/(A-2 Blank)

T.O. 33K6-4-3202-1

APPENDIX B

B-1

B-1 WORKSHEET: B-1.1 The Applied Values in the Worksheet are nominal values. The technician may substitute other values if they are within ±0.25 in Hg of the Applied Value listed in the Worksheet. If a substituted value is applied, then the technician must compute the appropriate Tolerance Value for the Worksheet. B-1.2 The Worksheet is provided as a guide for recording TI indication. The technician may alter the format of the Worksheet for local use. The technician may construct a spreadsheet to perform the Worksheet calculations.

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