Timeguard MLBPRO500C - Manual (Page 6)

9 10
5 Function and Operation
A Lens Shield - function
The lens shield contains 13 segments each of which can be broken in half. Each
segment can block 10º detection angle within the fi eld of view by pressing it onto
the outer ring of the sensor head. (See Fig. 25). The segments only work on the
outer 240º zone. The inner 3m radius zone is unaffected.
• How to use:
1. Take the outer ring off the sensor head. (See Fig. 24).
2. Decide on the detecting zone (or zones) that you want to be reduced or blocked.
3. Insert the lens shield segments into the slot of the outer ring as following
illustration (See Fig. 25). Then put the outer ring back into position on the sensor
head. The example shown will have blocked a 30ºdetection angle within the
outer 240º zone.
4. By breaking the outer section of a segment or group of segments the range at
that position in the outer zone will be reduced from 16m to 7m and not 3m.
B Walk Test
The MLB/WPRO500C will start working automatically approx. 3 minutes after the
power is switched ON.
Set the TIME knob to “6 sec.”, the LUX knob to “ ” and the METER knob to
“+” (Factory Presets).
You can start the “Walk Test” in any ambient light level and the light will go on
for about 6 seconds after each detection. While the light is ON and for 2 seconds
afterwards the person carrying out the walk must remain stationary before
continuing on the path shown in Fig. 25.
• How to adjust your desired detecting area(s):
1. Follow Fig. 25 and start the Walk Test across the detection zones to check that the
light under control comes on when entering or leaving a zone. Repeat it and adjust
the METER knob or sensor head until you are satisfi ed with the detection area.
2. To eliminate unrequired detection zones you need to use the lens shield (see 5A
Lens Shield - function).
Notes:
• When using the lens shield or adjusting the knobs, be careful not to damage the lens.
• Conditions below may cause reduction in sensitivity of the sensor.
a. On very foggy nights, sensitivity may be less due to moisture on the lens.
b. On very hot days, sensitivity may be less due to the temperature of the human
body being close to the temperature of the surroundings.
c. On very cold days little heat will be emitted from the body with heavy clothing
and head covering. This may reduce the sensitivity of the sensor.
d. Soap or polish may damage the sensor lens and can cause reduced sensitivity.
Clean with a soft damp cloth only.
Fig. 24 Fig. 25
Outer Ring
Fig. 26
Walk Test Start Finish