Druck ADTS 403F, Calibration Manual

Page: 25 / 40

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 15
Calibration and Adjustment of the Pitot Channel
Note: The pressure values shown in the table are the values used and suggested by the
manufacturer, other values can be used.
3. Adjust calibration standard to the first pressure value in Table 4 - 1. Allow 1 minute for the unit
to stabilize.
4. The display prompts for [ACTUAL VALUE], enter the pressure value on the calibration
standard. Press [PRES] and the display prompts for the next pressure value.
5. Repeat (3) and (4) for pressure No. 2 to 8 in Table 4 - 1.
6. After the last pressure value press [END] F4.
7. The unit calculates the change in zero (%FS) and span (%RD) from the previous, stored
calibration values. The new calibration can be accepted or rejected. Once accepted, the new
values are stored replacing the previous values.
8. Adjust calibration standard to atmospheric pressure. Using a 3 mm AF hexagonal key (Allen
key), turn the captive, calibration screw fully clockwise.
9. To verify the new calibration, carry-out a calibration check of the static channel as detailed
in Section 4.1, starting at (2).
10. After completion of all main calibration procedures, carry out the procedures detailed in
paragraph 4.9.
4.8 Calibration and Adjustment of the Pitot Channel
Before starting this procedure carry out a leak test as detailed in Section 2. Set the unit to
measurement mode, main calibration, external pressure source and Pt (pitot) calibration as
detailed 4.1.
1. Connect calibration standard to the pitot output.
2. The display prompts for the date of calibration DD/MM/YY.
Note:
The pressure values shown in the table are the values used and suggested by the
manufacturer, other values can be used.
3. Adjust calibration standard to the first pressure value in Table 4 - 2. Allow 1 minute for the unit
to stabilize.
4. The display prompts for [ACTUAL VALUE], enter the pressure value on the calibration
pressure. Press [PRES] and the display prompts for the next pressure value.
5. Repeat (3) and (4) for pressure No. 2 to 11 in Table 4 - 2; points 12 and 13 are used on the
1000 knot Pitot range sensors.
Note: A label on the front panel of the ADTS 403/405 shows the full-scale range of the Pitot
sensor.
6. After the last pressure value press [END] F4.
7. The unit calculates the change in zero (%FS) and span (%RD) from the previous, stored
calibration values. The new calibration can be accepted or rejected. Once accepted, the new
values are stored replacing the previous values.
8. Adjust calibration standard to atmospheric pressure. Using a 3 mm AF hexagonal key (Allen
key), turn the captive, calibration screw fully clockwise.
9. To verify the new calibration, carry-out a calibration check of the pitot channel as detailed in
4.4, starting at (2).
10. After completion of all main calibration procedures, carry out the procedures detailed in 4.9.