Analytical Industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter - Manual (Page 28)

Advanced Instruments, Inc
28
Analog Output with Zero O
2
In rare instances the 4-20mA signal output may not agree to the reading displayed on the LCD. This feature
enables the user to adjust the 4mA signal output when the LCD displays 00.00.
Note Adjust the 20mA signal output with the OUTPUT SPAN option described below.
Access the MAIN MENU by pressing the MENU key.
Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
Press the ENTER key to select the highlighted menu option and the following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT ZERO.
Press the ENTER key to select the highlighted menu option and the following display appears:
100.0
OUTPUT ZERO OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
The default setting of 100 illustrates no adjustment to the analog output signal. Compute the adjustment
value as described in Appendix B or consult the factory. The true adjustment value must be determined
empirically by trial and error. Adjust the initial value to above 100 to increase the analog signal value or
decrease it below 100 to decrease the analog signal.
090.0
OUTPUT ZERO OFFSET
PRESS UP OR DOWN
TO CHANGE VALUE
ENTER TO SAVE
MENU TO RETURN
Press the ENTER key to advance the underline cursor right or press the MENU key to advance the
underline cursor left to reach to the desired digit of the OUTPUT ZERO OFFSET value.
Press the ARROW keys to enter the OUTPUT ZERO OFFSET value.