Druck ADTS 403F, Calibration Manual

Page: 20 / 40

Copyright 1996 Baker Hughes Company.
10 | ADTS 403/405 Calibration Manual–English
Chapter 4. Calibration
published, minimum specification for the equipment entering service. Acceptance limits may vary
at the user's discretion for specific applications.
4.3 Calibration Check of the Static Channel
Before starting this procedure carry out a leak test as detailed in Section 2 Set the unit to
measurement mode, calibration check, external pressure source and static (Ps) calibration as
detailed in Section 4.1.
1. Connect calibration pressure to the static output.
2. Adjust calibration pressure to the first pressure value in Table
4 - 1.
3. Compare the pressure value on the calibration standard to the value displayed and record
the difference. Press [ENTER] and display prompts for the next pressure value.
4. Repeat (2) and (3) for pressure No. 2 to 8 in Table 4 - 1.
5. If the recorded difference exceeds the allowable tolerance (
a
) carry out a calibration
adjustment detailed in Section 4.7.
6. Select F4 [END]. The display goes back to the channel select menu, select another channel
for calibration checking or exit the calibration menu.
7. Adjust calibration standard to atmospheric pressure. Disconnect calibration standard from
the static output.
8. If there is no further calibration or testing required, switch off the unit.
4.4 Calibration Check of the Pitot Channel
Before starting this procedure carry out a leak test as detailed in section 2. Set the unit to
measurement mode, calibration check, external pressure source and pitot (Pt) calibration as
detailed in Section 4.1.
1. Connect calibration standard to the pitot output.
2. Adjust calibration pressure to the first pressure value in Table
4 - 2.
3. Compare the pressure value on calibration standard to the value displayed and record the
difference. Press [ENTER] and display prompts for the next pressure value.
4. Repeat (2) and (3) for pressure No. 2 to 11 in Table 4 - 2; points 12 to 13 are used on the 1000
knot Pitot range sensor.
Table 4 - 1: Static Channel Calibration Pressures
Pressure No. Pressure (mbar) Tolerance
a
(± mbar)
a. The tolerance quoted in this table may need to be adjusted to allow for measurement uncertainties of the calibration
standard in use. The limits stated relate to the published, minimum specification for the equipment entering service.
Acceptance limits may vary at the user's discretion for specific applications.
1 27.62 0.1
2 72.00 0.1
3 189.00 0.1
4 466.00 0.1
5 697.00 0.1
6 843.00 0.1
7 1013.00 0.1
8 1355.00 0.1