Baker Hughes Druck DPI 610A, Instruction Manual

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Copyright 1998 Baker Hughes Company.
English–DPI610A Instruction Manual | 11
5. Press the RUN key (F1) and operate the hand-pump, continue until the switch operates:
6. Carefully open the release valve and allow airspeed to decrease until the switch operates
again. The display shows the operating airspeeds and hysteresis.
7. Record the displayed operating data.
8. Allow the airspeed to decrease until it is below 80
kts.
9. Slowly open the manual let-down valve to return system to zero (ground level).
10. To perform another switch test, press RUN (F1) and repeat the above procedure.
11. To cancel switch test mode, press TASK.
2.3.2 Method (Non-accessible Switch Contacts)
When the airspeed switch contacts cannot be connected to the instrument, an external indicator
or annunciator must be used as indication of airspeed switch operation. The user, on receipt of
an indication of switch operation, presses the MANUAL OPERATION (F2) key:
1. Connect the instrument to the pitot system as shown in Figure 4. Ensure that the static
system is vented to atmosphere before starting the test.
2. Ensure that positive pressure is selected and close the release valve.
3. Close the manual let-down valve.
4. Zero the airspeed reading by pressing the ZERO key.
5. Press the RUN key (F1) and operate the hand-pump, continue until the switch operates and
immediately press (F2).
6. Carefully open the release valve and allow the airspeed to decrease until the switch operates
again and immediately press (F2). The display shows the operating airspeeds and
hysteresis.
7. Record the displayed operating data.
8. Allow the airspeed to decrease until it is below 80
kts.
9. Slowly open the manual let-down valve to return system to zero (ground level).
10. To perform another switch test, press RUN (F1).
11. To cancel switch test mode, press TASK.
2.4 Airspeed Leak Tests
Select TASK, AERO:
kts kts
kts
SWITCH TEST
CONTACT STATE
AIRSPEED
RUN
MANUAL
OPERATION
STOP
MANUAL
OPERATION
STOP
AIRSPEED AIRSPEED
CONTACT STATE
CLOSED AT
550 kts
OPENED AT 525 kts
HYSTERESIS 25 kts
SWITCH TEST SWITCH TEST
CONTACT STATE
CLOSED AT
550 kts
kts kts kts
SWITCH TEST
CONTACT STATE
AIRSPEED
RUN
MANUAL
OPERATION
STOP
MANUAL
OPERATION
STOP
AIRSPEED AIRSPEED
CONTACT STATE
CLOSED AT
550 kts
OPENED AT 525 kts
HYSTERESIS 25 kts
SWITCH TEST SWITCH TEST
CONTACT STATE
CLOSED AT
550 kts