Bentel Security 601PH Mode D'emploi page 4

The second thermistor is located out of the airflow , but still within the smoke labyrinth and has a longer time costant and
is used as a temperature reference to compare the sensing thermistor against.
At a given temperature differential between the two thermistors, the comparator will switch and increase the gain of the
amplifier, thereby increasing the sensitivity of the smoke sensor.
Fins located on the top of the labyrinth are designed to increase air turbulence and the efficiency of the sensing
thermistor.
WIRING
The detector circuits requires a positive and negative supply and these are wired to terminals L1 and L on the base
(Polarity insensitive). Base terminal L2 is connected to base terminal L1 when the detector is fitted to provide continuity
monitoring through the detector. Base terminals L2 and L provide outputs to the next detector or EOL device.
In case of alarm the detector comunicate the state to control device by sinking from the supply leads an extra current
according to the figure 3, for restoring from an alarm condition the power has to be removed for 2-5 seconds.
A drive is provided for a remote indicator connected between supply + and terminal R, therefore at a detector where
remote indicator is connected, the polarity of the supply must be known.
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0 2 4 6 8 10 12 14 16 18
Detector voltage (V)
Fig. 3 Alarm load.
INSTALLATION
The 601PH is designed to become enanched by detecting a rapid rise (>10°C) in air moving horizontally across the ceiling.
Siting sensor in positions where air is being blown through the detector should therefore be particulary avoided, eg. close
to ceiling ducts or ceiling mounted industrial heaters or areas of forced ventilations.
MAINTENANCE
The lenght of time between service for each detector will depend upon the environment into which they are installed. It
is recommended to Inspect, test and clean the detector at least annually.
The detector must be removed for service replacement typically each 5 years (up to 10 years subject to environment).
+The Manufacturer reserves the right to change the technical specifications of this product without prior notice.
L1
L
L2
R
L.R.
20 22 24 26 28 30 32 34
Fig. 4 Fit the detector unit onto the MUB base (as per
L1 L1
L L L2
L2
R R
E.O.L.
Fig. 2 Connection diagram.
figure) then twist clockwise.