4.5.9 Function 9: Special calibration function
For some transmitters, AO calibration instructions cannot be supported. For this situation,
has a special calibration
method to resolve it. After calibration, the actual pressure range has the linearity relationship with current loop CA (4~20) mA.
This is very useful in application of transmitter with (4~20) mA loop current.
Operation steps as below:
a. As figure 4-5-9-1, press to enter HART function 9; press to enter the detective linkage (see figure 4-4).
b. As figure 4-5-9-2, press to entry calibration menu. The
self-selects the higher limit point or lower limit point
according to the different pressure supplied by users. After the CP and CA is steady, press to make screen shows
"_ _ _ _ _ _" in second line. This means the current calibration is finished. If this result is not ideal, it could be re-calibrated.
ADT672
ADT672
Sensor Trim
To trim the pressure sensor, includes the lower reading limit trim and upper reading limit trim.
Includes:
Lower range reading trim
Mid-range reading trim (only available for some DUTs which have this function)
4.5.10 Function 10: Sensor Trim
：
Figure 4-5-9-1: F9 entrance Figure 4-5-9-2: Special calibration interface
24V
HART
0
25
50
75
100
24V
HART
0
25
50
75
100
CP
CA
A
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