GDC-350 Operation Manual
30
5909-9000
Rev
1
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 test points 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.
5.5. Calibrating a Second On-Board Sensor
Calibration of the second on-board sensor has only one difference from the first on-
board sensor calibration. Move the jumper on J6 to P3 then follow the same
procedure as in the previous section (Calibrating the On-board Sensor).
5.6. Calibrating a Remote Solid-State Sensor
SETTING SPAN GAS VALUE
Step
Setting the Span Gas Value Procedure
1
Move the jumper on J6 to P3 and move the jumper on J7 to P2.
2
The audible alarm beeps once for confirmation. The system is now
waiting for the user to set the desired span value.
3
Attach volt meter leads to test points TP1 and TP2.
4
Using the UP or DOWN push-buttons, achieve the calculated voltage on
the volt meter.
5
Move the jumpers from J6 and J7 back to their P1 resting positions.
