Azbil JTD720A, User Manual, Page: 59 / 76

Azbil Corporation Instrument maintenance and troubleshooting
Model JTD720A - Smart Multivariable Transmitter 4-9
4-2-2-2 Calibrating when pressure is equalized
The calibration method when the pressure is equalized is as follows.
CAUTION: If the transmitter’s process is controlled automatically, this reset action could put the
operation at risk by causing output fluctuation. Before resetting, make sure that the control
loop for the process is manually controlled.
Select [Device Setup]
→
[Diag/Service]
→
[Calibration]
→
[Correct Input].
•
Double-click DP Zero Trim.
•
A warning that the loop should be switched from automatic control to manual mode
is displayed (WARN - Loop should be removed from automatic control). After
switching to manual mode, click OK.
•
A warning that this operation will affect the sensor calibration (WARN-This will
affect sensor calibration) is displayed. To proceed, click [OK].
• The question “Set DP Mode. OK?” appears in order to confirm configuration of the
differential pressure mode. To set the mode, click [OK].
•
When “Apply 0 input to sensor” is displayed and the differential pressure input is
equalized, click [OK].
• If the calibration succeeds, [DP zero trim succeeded] will be displayed. Click [OK].
• After clearing the differential pressure mode, the “Note - Loop may be returned to
automatic control” message is displayed to notify you that you can now switch back
to automatic control. Click OK.