Critical Environment Technologies GEM-II, Руководство по эксплуатации

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© 2014 All rights reserved. Data subject to change without notice. 55
Rev. E | 2014.10 GEM-II - Operation Manual
At the GEM:
Move jumper from J6 to position-3 and the jumper from J7 to position-2.
Using the UP and DOWN push-buttons, set the voltage to 2.00 VDC.
Step 2:
Now, move the jumper from J6 to position-3 and the jumper from J7 to position-4. The audible
will beep once for confirmation. The system is now starting the span calibration stabilization
time (30 seconds).
Step 3:
Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. If the audible
sounds with repetitive beeps. Reference Section
8.8 Forcing Calibration . The audible will beep
twice when the calibration begins. The audible beeps three times indicating the procedure is
finished (2 minutes).
Step 4:
Move jumpers from J6 & J7 back to their respective resting positions and remove the transmitter.
8.8 forcing Calibration
If during the calibration procedure the GEM starts to display underflow or overflow or the
audible alarm starts to beep at a 1-second interval, the technician will need to determine if
the GEM sensor is more than 30% out of calibration or if the incorrect gases or gas values have
been applied. If the gases are confirmed to be correct the technician can override the automatic
calibration and force the GEM to accept the new values. This procedure requires the technician to
press both the UP and DOWN push-buttons at the same time to cause the “forced calibration”.