Line heat detector with combinable
maximum temperature and rate-of-rise
detector configuration. It is suitable
for response grades A1, A2, B and C in
compliance with EN 54-5 for maximum line
lengths of 300m with ambient
temperatures of 65°C.
The evaluation unit detects changes in
temperature by permanently monitoring
the resistance level in the NTC
insulation of the sensor cable. A
temperature change will influence the
resistance value between the connected
loops within the sensor cable: in case
the temperature rises, the resistance
level decreases. Each change in the
resistance level is detected by the
evaluation unit and when reaching the
pre-configured alarm threshold, the
respective alarm messages are
transmitted. The alarm threshold for
maximum temperature alarm can be set via
a 16-contact switch. The maximum
temperature alarm is triggered when the
static alarm temperature in the sensor
cable is exceeded. For configuring the
rate-of-rise alarm threshold, two
16-contact switches are provided.
DIFF-Time automatically changes the time
interval for detecting the ambient
temperature levels. The shorter the time
interval, the less sensitive the
response behaviour. DIFF-Alarm changes
the difference in temperature that
causes an alarm within the chosen time
interval. There is one LED for normal
operation, maximum temperature alarm,
Diff-Alarm and trouble respectively.
With two check buttons, the system can
be electrically checked for alarm and
trouble. Both reports are stored by the
evaluation unit. The line heat detector
is connected to the fire alarm control
panel via the esserbus transponder and
the reset module 781332. For resetting
the evaluation unit, the reset button at
the fire alarm control panel must be
activated in order to interrupt voltage
supply. Alternatively, the internal
reset button can be activated.
Technical data
Material ABS
Dimensions (WxHxD) 200 x 120 x 80mm
Weight approx. 550g
Type of protection IP 65
Colour grey, similar to RAL 7035
Temperature range -20°C to 50°C
Sensor length up to 300m
Voltage 10-30V DC
Quiescent current max. 25mA (at 24V)
Alarm current max. 2mA (at 24V)
Current consumption in case of failure
max. 15mA (at 24V)
Starting current < 100mA (at 24V)
