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. There are 2 possible sensor types:
• Front facing sensor (CO only) which 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.
3. Make sure the DIP switches 1-6 are NOT all in the ON position. If they are, move any
one to the Off (down) position.
4. 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.
5. Press and hold the calibration pushbutton until the Status LED glows orange
acknowledging the calibration request. Release the pushbutton.
6. 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 4.
7. If the Status LED glows orange, and starts blinking green after the Calibration
pushbutton was released, then the EC-Gold is in Dual Point calibration mode. First,
press the Calibration pushbutton again until it glows orange then release it. The Status
LED will glow red for ~3 seconds indicating that the calibration was unsuccessful (no
change in gas concentration for a Dual Point calibration). The unsuccessful calibration
does not change the EC-Gold calibration values. Go to section 3.0 to change the
calibration type to Single Point, and then attempt calibration again from step 4.
8. If the Status LED remains green after the Calibration pushbutton is released,
then the Calibration has been successfully completed. 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.
4.3 DUAL POINT CALIBRATION
This procedure is typically done at the factory. The Dual Point calibration not only trims the
sensitivity (like a Single Point calibration), but also zeroes the reading i.e. 0 ppm in clean air.
The EC-Gold must be configured for Dual Point calibration, and the calibration gas
concentration value must be known. If either setting is in doubt, then see section 3 to set
these values.
The Dual Point calibration is carried out if the EC-Gold must be zeroed in the field (i.e. a
new sensor has been installed). This is the procedure:
1. Determine what Calibration gas concentration the EC-Gold is expecting for the second
point – the first point is always assumed to be 0 ppm. This value is listed in the back of
the user manual in the CONTROLLER SETTINGS sheet. This value can be changed at