GDC-350 Operation Manual
5909-9000 Rev 1
31
CALIBRATING THE NULL (ZERO)
Step
Calibrating the Null (Zero) Procedure
1
Attach a regulator to a cylinder of zero air.
2
Attach the flow adapter and open the regulator valve fully to allow zero air
to flow over sensor. Use a slight twisting motion as you gently push the
calibration adapter into the sensor opening. If the calibration adapter is
hard to insert, moisten the “O” ring seal slightly then try re-inserting it.
3
Move the jumper on J6 to P3 and move jumper on J7
to P3. The audible
alarm beeps once for confirmation. The system is now starting the zero
calibration stabilization time (30 seconds).
4
If desired, attach volt meter leads to test points TP1 and TP2. The voltage
should be 0.0 VDC.
5
The instrument will beep twice when the calibration begins. Leave the
zero air flowing over the sensor until the GDC-350 beeps three times
indicating the procedure is finished (1 minute).
6
Move the jumpers from J6 and J7 back to their P1 resting positions and
remove the zero air (or nitrogen).
CALIBRATING THE SPAN
Step
Calibrating the Span Procedure
1
Attach a regulator to a cylinder of span gas.
2
Insert the calibration adapter into the sensor opening on the front of the
enclosure. Use a slight twisting motion as you gently push the calibration
adapter into the sensor opening. If the calibration adapter is hard to insert,
moisten the “O” ring seal slightly then try re-inserting it.
3
Open regulator valve fully and allow span gas to flow over sensor.
4
Move the jumper on J6 to P2 and move the jumper on J7 to P4. The
audible alarm beeps once for confirmation. The system is now starting the
span calibration stabilization time (30 seconds).
5
If desired, attach volt meter leads to TP1 and TP2. The reading should
start moving towards the voltage calculated for the span gas value.
6
The instrument will beep twice when the calibration begins. Leave the
span gas flowing over the sensor until the GDC-350 beeps three times
indicating the procedure is finished (2 minutes).
7
Move the jumpers from J6 and J7 back to their P1 resting positions and
remove the span gas.
