8
GG-R
Figure 2: Sensor board components
and zero/span adjustment
4mA adjustment:
Sometimes a fine adjustment of the
4mA signal may be desired to compensate for a slight
positive or negative zero-signal reading on the control
panel.
•
Check the true zero signal first by putting the
sensor into calibration mode (green LED is flashing).
• Make sure the zero signal is 40 mVDC, +/- 5 mVDC,
and adjust zero pot if necessary.
•
Exit calibration mode (green LED is NOT flashing).
• Adjust the 4mA pot until the control panel reads
zero.
Zero-filter mode (deadband mode)
The default operation mode of the GG-R Sensor has
an active deadband to eliminate the display of signals
within the zero noise of the sensor. To change or view
the zero-filter mode, follow the procedure below:
• Press and hold the CAL switch for approximately 4
seconds (green LED will blink 4 times per second.
The red LED will indicate the deadband mode of the
sensor. Red LED lit for enabled, and red LED off for
disabled.)
• Press the CAL switch to toggle the desired
deadband mode (on or off).
• After 10 seconds of not pressing the CAL switch, the
unit will return to normal mode, while storing the
deadband mode that was selected.
• The deadband selection is stored in EEPROM and
will remain until changed.
Span adjustment
Zero adjustment
Calibration
gas port
40-200 mV
mVDC
Black
Red
-
+