Spectrex Series 300 Open-Path Gas Detection System - Manual (Page 56)

Spectrex Inc. - SafEye TM 300 Gas Detector Manual – TM 794100, Rev. D, May 2004
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2. Switch from Alignment to Standby mode. The LEDs will flash alternately
with a green color.
3. Switch from Standby to Calibration mode. The LEDs will turn off.
4. Wait up to 60 seconds until it switches to Normal mode (right LED green)
The detector reading is now set to normal. The 4-20mA output should
indicate 4mA.
6.7 Functional Check of Unit
The SafEye system has been calibrated at the factory for the User's specific gas
or vapor detection requirements. The following procedure validates the functional
operation of the system. The Functional Check Filter is a convenient operational
check used to confirm that response has not changed from previous readings.
The filter is not used for calibration, which is unnecessary, nor does it equate to a
particular quantity of gas.
Caution:
Automatic activation or any external device that should not be
activated during the calibration check should be disconnected.
Notes:
1. This functional verification procedure is for a standard
4-20mA output.
2. Prior to starting the functional check, verify that the
power to the units is on and that the current of the 4 -
20mA channel is stable. Record the reading.
1. Position the Functional Check filter in front of the SafEye Detector.
2. The functional check filter's window must be centered over the viewing
window of the Detector.
3. Wait 20 seconds.
4. Read the 4-20mA current. Determine the difference between the reading
taken with and without the Functional Check Filter. This difference is the
4-20mA current variance.
5. Record the 4-20mA current variance in a Maintenance Logbook. If the
variance is more than a 30% change when compared to the previous
check (see delivery form), repeat the alignment.