Martel Electronics 320 - Manual (Page 47)

CALIBRATION USING % FUNCTION
You can use the % Function to calibrate a P/I pressure
transmitter.
For this example we will calibrate a pressure
transmitter that has a manufacturer’s range of 0-50
PSIG. The desired calibration will be 0-25 PSIG for a
4-20 mA output. We are using a Model 320 with a 30
PSIG range.
Press Setup-3 to enter the percent function setup
mode. Enter the following values in response to the
prompts:
Enter input Z 0
Enter input FS 25
Enter output Z 4
Enter output FS 20
1=I/P 2=P/I 3=P/P 2
The Model 320 will then exit the setup mode and
resume a normal display. Press the % key to activate
the percent function. With the pressure vented to the
transmitter, you should see a display similar to this:
45
% scale %error
+0.00 -1.25