Specifications

GDC-350 Operation Manual

5909-9000 Rev 3 31

CALIBRATING THE NULL (ZERO) (remote catalytic or SS sensor)

Step Calibrating the Null (Zero) Procedure

1 Attach a regulator to a cylinder of zero air.

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.

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).

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).

Move the jumpers from J6 and J7 back to their P1 resting positions and

remove the zero air (or nitrogen).

CALIBRATING THE SPAN (remote catalytic or SS sensor)

Step Calibrating the Span Procedure

1 Attach a regulator to a cylinder of span gas.

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.

Move the jumper on J6 to P3 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).

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).

Move the jumpers from J6 and J7 back to their P1 resting positions and

remove the span gas.