Azbil PTG71, User Manual

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Azbil Corporation Calibration
Model PTG71 / 72 - Smart Pressure Transmitter 4-1
Chapter 4 : Calibration
With the Model PTG Transmitter, no span interference will occur once its zero-
point calibration is complete. That is, only one zero-point adjustment is needed for a
complete calibration.
Note: Adjust the zero point in an area that does not require explosion-proofing.
Zero adjustment
Caution: Zero adjustment must be performed in a non-hazardous area.
Calibration procedure
1. Connect the power supply to the Transmitter.
2. Apply the pressure corresponding to 0% output. In order to set this 0% output
to 0 kPaG, release any gas or liquid from the wetted part and leave it open to
atmospheric pressure.
3. This product has two zero adjustment terminal pins.
Using a flat-head screwdriver, allow the two terminal pins to contact each other
simultaneously (for about one second). (For products equipped with a built-in
digital indicator, when two terminal pins contact each other the word “ZERO”
will appear on the indicator.)
4. The Step 3 above completes zero adjustment.
Test terminal
When checking the output from the Transmitter for maintenance purpose, connect an
amperemeter to the “CHK +” terminal and to “-” of the Transmitter’s “SUPPLY”
terminal.
SUPPLY CHK
ZERO
+ + Ð
Flat-head screwdriver
Zero adjustment terminal pin
Zero adjustment terminal
Figure 4-1 Zero adjustment