Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 11
Calibration Check of the Combined Pitot and Static Channels
Note:
A label on the front panel of the ADTS
403/405 shows the full-scale range of the Pitot
sensor.
5. If the recorded difference exceeds the allowable tolerance (
a
) carry out a calibration
adjustment detailed in Section
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 pitot output.
8. If there is no further calibration or testing required, switch off the unit.
4.5 Calibration Check of the Combined Pitot and Static Channels
Before starting this procedure carry out leak tests as detailed in section 2. Set the unit to
measurement mode, calibration check, external pressure source and static (Ps) and pitot (Pt)
calibration as detailed in Section
1. Connect calibration standard to the pitot output.
2. Adjust calibration standard to the first pressure value in Table
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 8 in Table
3.
5. Press F4 [END PS], the unit automatically isolates the static channel from further pressures.
Table
4
-
2: Pitot 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
0.24
2
72.00
0.24
3
189.00
0.25
4
466.00
0.25
5
697.00
0.26
6
843.00
0.27
7
1013.00
0.27
8
1100.00
0.28
9
1655.00
0.32
10
2200.00
0.36
11
2590.00
0.40
12
3000.00
0.44
b
b. 1000 knot Pitot (Pt) range.
13
3500.00
0.49
b
CAUTION
The static channel transducer will be over-pressurized and
probably damaged if further pressure in Table
3 are applied.
Summary of Contents for ADTS 403F
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