
TBD-8100
© 2017 –Telefire Fire & Gas Detectors Ltd Revision 1.00 November 2017
–Page 7 of 10 –
Note
In some cases (usually when the distance between the detector and the
prism is less than 10 m), there is a need to attach the black patch, supplied
with the detector, onto the transmitter’s lenses.
The detector would signal during the initial detector direction, by
lighting up the 4 green LEDs, that the black patch must be attached.
3.4.1 Using detector card 4 LEDs or a voltmeter
1. Move the alignment switch (DIP SW 6) to the calibration position (ON).
2. Power on the detector.
3. Slowly turn one of the alignment wheels in one direction while watching the HL1-
HL5 LEDs. As the detector approaches optimum calibration, the number of lit green
LEDs increases from left to right.
Each LED that lights up, indicates that the beam’s signal strength is increasing. You
should aim to reach a maximum number of lit LEDs.
If only the red LED lights up, the beam is not being reflected by the prism.
Additionally, the signal strength can be measured by connecting a voltmeter to
points +RM- in the XT1 adapter.
The voltage should approach the voltage supplied to the detector.
4. If the number of lit LEDs starts decreasing, you are moving away from the optimum
direction –Retract until you reach a maximum number of lit LEDs.
5. Measure the voltage between points 3 and 4 (RM) in the XT1 connector. Maximize
the voltage so that it approaches 24Vdc, as near as possible (at a small operating
range of the detector, when the patch is attached to the lens, the actual voltage
measured during calibration is only about one half of the input voltage).
6. Repeat the procedure with the other wheel.
7. Verify that the detector faces the prism and does not receive reflections from other
sources. Cover the prism and check if the voltmeter’s voltage drops to around 0V.
8. Return calibration switch 6 to the OFF position and you have about 50 seconds to
put back the detector’s cover. After a minute and a half the red LED starts flashing
once every 5 seconds, approximately.
3.4.2 Adjusting the detector using an external monitor
1. Connect a monitor to a TRA-1B adapter at the TV In +/- terminals
2. Power on the monitor
3. Turn the alignment switch (DIP SW 6) to the calibration position (ON)
Note
Do not power on the detector before the DIP SW 6 has been switched to the
calibration position (ON).
4. Turn the detector power ON. Attention –During calibration, the detector is in a fault
mode