User manual

Model: EC-GOLD
ECGOLDUM17.DOC Rev: 1.7
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any time as described in SETTING THE CALIBRATION GAS CONCENTRATION
section described earlier.
2. Important: first make sure that the ambient air around the sensor is clean i.e. it has no
traces of the gas being monitored. This can be difficult in places where there are
vehicles etc. In applications where the ambient air is not guaranteed to be clean, use a
compressed air calibration canister and apply the air to the sensor as described below
for gassing the sensor with the second point.
3. After making sure that the sensor is in clean air (either ambient or from a canister),
press and hold the calibration pushbutton until the Status LED glows orange
acknowledging the calibration request for the first point.
4. If the Status LED does not glow orange, and starts blinking green after the
Calibration pushbutton is released, then the DIP switches (1-6) are probably set to
Enter Setup Mode i.e. all of them are set to ON. If this is the case, press the Calibration
pushbutton to exit the Setup Mode, then set DIP switch 6 to OFF (down). Attempt
calibration again from step 3.
5. If the Status LED glows orange, and then glows red for ~3 seconds after the
Calibration pushbutton is released, then the EC-Gold is in Single Point Calibration
mode. Go to section 3.0 to change the calibration type to Dual Point, and then attempt
calibration again from step 3.
6. If the Status LED now starts blinking Green, the first point of the Dual Point
calibration has been entered. The EC-Gold is now expecting the second point.
7. There are 2 possible sensor types:
• Front facing sensor (CO only) that must be gassed by inserting the end of the
calibration tubing through the front plate. Take care not to press the end of the tube
too hard against the sensor.
• Down facing sensors which must be gassed by fitting the calibration cup over the
sensor fitting.
8. Start gassing the sensor by opening the valve on the canister. The flow rate is preset to
0.5 Lpm (or ~1 SCFH (Standard Cubic Foot per Hour). Wait about 90 seconds.
9. Press and hold the calibration pushbutton until the Status LED glows orange
acknowledging the calibration request. Release the pushbutton.
10. Calibration is complete. If the calibration was successful, the Status LED remains
green. If there was a calibration error such as not enough change for the gas
concentration used, then the Status LED shows red for about 2-3 seconds before
reverting back to green. For unsuccessful calibrations, the original calibration values
remain unchanged. For example, if the EC-Gold calibration gas is set as 100 ppm via
the DIP switches (this is described earlier), but the actual gas used is only 20 ppm then
the calculated sensitivity will be out of allowed limits and will cause a calibration error.
The Status LED will light red for 2-3 seconds, but the new erroneous calibration values
will be discarded.
THIS COMPLETES THE CALIBRATION PROCEDURE