Druck ADTS 403F, Calibration Manual

Page: 15 / 40

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 5
ADTS Leak Test
2. Leak Test
2.1 ADTS Leak Test
A leak test should be carried out before a calibration procedure to make sure of the integrity of
the ADTS.
1. Allow one hour for the ADTS to thermally stabilize after switching on and before calibration.
2. Select RATE ALT and a rate of 195
mbar/min. Select RATE SPEED and a rate of
335 mbar/min.
3. Select ALT and enter a new aim point of 1000 mbar. Check that the ADTS attains the new
aim point. Make sure the pressure is stable and within ± 0.1 mbar of the aim point.
4. Select AIRSPEED and enter an aim point of zero. Check that the ADTS is controlling at the
aim point.
5. Enter a new aim point of 1450 mbar. Check that the ADTS attains the new aim point. Make
sure the pressure is stable and within ± 0.1 mbar of the aim point.
6. Select RATE ALT and LEAK TEST. Select START TIMER for a 5 minute wait and a 5 minute
test. Press F3 to start the test.
7. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
8. Select RATE SPEED, the leak rate must be less than 0.5 mbar/min.
9. Select REGAIN CONTROL. Select ALT and enter a new aim point of 75 mbar abs. Check
that the ADTS attains the new aim point. Make sure the pressure is stable and within
± 0.1 mbar of the aim point.
10. Select RATE SPEED and LEAK TEST. Select START TIMER for a 5 minute wait and a
5 minute test. Press F3 to start the test.
11. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
12. Select RATE SPEED, the leak rate must be less than 0.5 mbar/min.
13. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
14. Repeat (3) to (8) with ALT at 30 mbar and AIRSPEED at zero.
15. Select REGAIN CONTROL. Select GO TO GROUND. Check that the ADTS attains an ALT
pressure of atmospheric, an AIRSPEED value of zero.
16. Select END OF TEST. The ADTS is now ready for calibration.
2.2 Purge and Leak Test
Connect the ADTS to the calibration standard. Use the ADTS calibration check facility to purge
and leak check the ADTS and the calibration standard as follows:
1. Enter the calibration check facility and select the required calibration mode.
2. Apply a vacuum from the calibration pressure source. Maintain for five minutes. Return the
pressure to approximately atmospheric pressure using the calibration media. Do not vent to
atmosphere. Repeat twice more.
3. Apply a suitable pressure, allow to stabilize and leak test the ADTS and calibration system.