Net Safety Monitoring
MAN-0015 Rev 14 UVIRS-A/AR
17
November 07, 2008
D
ETECTOR
M
AINTENANCE
Although an automatic testing of the optics is done every 90 seconds, the
system should be periodically checked. To maintain maximum sensitivity,
the viewing window and reflector should be cleaned on a routine basis
depending on the type and amount of contaminants in the area.
T
ESTING
WARNING:
When testing the system, ensure all external equipment is
disabled to prevent unwanted activation.
Manual Check Procedure
The whole system should be checked periodically with a Net Safety UV/IR
test lamp to make sure that the detectors are not obstructed, that the area
covered by the detector has not changed and that there is no fault in the VI
circuit.
1.
Activate and direct the UV/IR test lamp at the detector viewing window.
The current output will change with the amount of radiation being
detected and the Red LED will flash (refer to “ Table 5 - Status LEDs
and Current Output”).
2.
Turn off the UV/IR test lamp after successful check.
3.
Repeat steps 1 & 2 for all detectors in the system.
4.
After all detectors have been checked, return the system to the normal
operating mode and enable any external equipment.
Automatic Visual Integrity (VI) Test
The detector performs an automatic Visual Integrity (VI) test every 90
seconds during normal operation. If the lens is dirty, obstructed, or the
reflector is dirty, obstructed or misaligned, the unit will perform a number of
VI tests to confirm the presence of the obstruction.
If the obstruction is temporary, the unit will return to normal after the
obstruction is removed. If the obstruction remains, the unit will drop the
current output to 2 mA and the yellow LED will flash continuously
indicating a misaligned reflector, failed sensor or contaminants on the
window or reflector. The detector will remain in this condition until the
problem is corrected. The detector window should be promptly cleaned (refer
to "Cleaning window/Lens & reflector" ) or the obstruction removed. Also
refer to the troubleshooting section – Possible Problems & Solutions.
Manual VI Test
This test procedure can assist with maintenance planning and is often
performed during commissioning. The detector has a manual VI input and
the manual VI test is performed by:
•
connecting Manual VI to system power by a direct connection OR
•
connecting a momentary contact push button between system power and
the manual VI input.
•
The Net Safety Junction Box is optional and is available with or without a
Manual VI Test Switch (for Analog models). Activate the Manual VI
Test Switch with the magnet if the switch is available, otherwise use
other available options mentioned above for manual VI Test.
Summary of Contents for UV/IRS-A
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