Functional Check of Unit
56
SafEye
TM
Open Path Detection System User Guide
6.4
Zero Calibration
Precise alignment must be performed prior to the calibration procedure.
Calibration should be performed in nice weather conditions with
insignificant gas concentrations in the surrounding environment or
indoors.
Notes:
•
To change modes, place the magnetic mode selector (see Error!
Reference source not found., Item 1) on the detector for 2 seconds
and wait for the LED indication.
•
After mode change allow a time lapse of 5 seconds before changing
mode again.
•
Standby mode is a temporary mode lasting about 20 seconds used to
facilitate Zero Calibration mode selection. If the mode selector is not
placed during this 20 second period, the detector will be switched to
Normal mode.
•
Switch from Normal to Alignment mode: See Table 2 for LED status
indication.
•
Switch from Alignment to Standby mode: the LEDs will flash
alternately with a green color.
•
Switch from Standby to Calibration mode: the LEDs will turn off.
•
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.
6.5
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:
•
This functional verification procedure is for a standard 4
–
20mA output.
•
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.
