GDC-350 Operation Manual
5909-9000 Rev 1
33
USING A BACHARACH GDC-150 TO CALIBRATE THE NULL (ZERO)
Step
Using a Bacharach GDC-150 to Calibrate the Null (Zero) Procedure
1
At the GDC-150: For zero calibration on the GDC-150, move the jumper
to P2 and set the voltage at TP1 and TP2 for 0 VDC. If transmitter has
been calibrated, TP1 and TP2 should be reading 0 VDC.
2
At the GDC-350: Move the jumper from J6 to P3 and the jumper from J7
to P3.
3
The instrument will beep 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. Monitor
the voltage. It should start moving towards zero gas value 0 VDC.
5
The instrument will beep twice when the calibration begins. The
instrument beeps three times indicating the procedure is finished
(2 minutes).
6
Move the jumpers from J6 and J7 back to their P1 resting positions.
USING A BACHARACH GDC-150 TO CALIBRATE THE SPAN
Step
Using a Bacharach GDC-150 to Calibrate the Span Procedure
1
At the GDC-150: With the transmitter still connected, move the jumper to
P2 and set voltage at TP1 and TP2 for 2.00 VDC.
2
At the GDC-350: Move jumper from J6 to P3 and the jumper from J7 to
P2. Using the UP and DOWN push-buttons, set the voltage to 2.00 VDC.
3
Now, move jumper J7 to P4.
4
The instrument will beep 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. Monitor
the voltage.
6
The instrument will beep twice when the calibration begins. The
instrument beeps three times indicating the procedure is finished
(2 minutes).
7
Move jumpers from J6 and J7 back to their P1 resting positions and
remove the transmitter.
6. SYSTEM
MAINTENANCE
The GDC-350 series system requires virtually no maintenance other than regular
calibration of the integral and/or remote sensors and ensuring that excess water or
dust is not somehow entering the enclosure and physically damaging the circuit board
or internal components.
