1. Overall and fitting dimensions.
48x48x48 mm
2. Ability to operate in total darkness or light
disturbance (daylight, artificial light, etc.).
3. Operating characteristics: aspect angle,
response, supply voltage, max. response speed,
type of sensor output, output capacity, etc.
Possibility to use only in total darkness.
4. Possibility of sensor operation without additional
control units. For example: sensor output - relay,
closes pneumovalve control circuit.
If operates only with control unit, how many
sensors could be connected to it.
5. Possibility of integration of multiple sensors or
units in one executive unit.
6. Sensor “reset”, and “set at ready” time.
Aspect angle 100 degrees, we recommend to install two
sensors opposite each other, response speed of whole
system is 100 milliseconds, (if airflow speed is about 20
m/s, distance is about 4 metres. Operating voltage 110230V. Main control unit takes stock of errors and limit
parameters.
The simplest suggested layout is when VMR100 sensor,
directly operates solenoid valve.
4 sensors could be connected to one control unit.
Sensor resets automatically. About 2 seconds is needed
for extinguishing of sparks (from the moment of watering
start).
2 sensors
7. What’s the minimum number of sensors, needed
for reliable detection of one spark, appeared in
pipeline with diameter 250 – 350 mm. Spark speed
10 -- 20 m/sec.
8. Possibility to use sensors in pneumatic pipelines, Sensors are designed for use in these conditions.
transporting cotton and textile industry waste. Is
there any experience of using this sensor in textile
industry?
Example of complex protection of exhaust duct:
Control unit
Routing gateway
VMR100
VMR spacing bushing 1"
Diagnostic bulb
Spacing bushing for diagnostic bulb 1"
Extinguishing unit frame AS1
nozzle 57l
solenoid valve 3/4
spacing bushing for solenoid valve 3/4"
pressure boost unit 100l
alarm unit
cable (50m)
aluminium pipe with electric cable (15 m)
thermal cable (30 m)
cable (30 m)
thermal cable distribution box
thermal cable end box
VMR spark sensors detect spark electromagnetic emission and act on it.
Sensor measures length of wave, emitted by sparks end act immediately. Response takes about thousandths
of a second after sensor detects a spark.
VMR sensors are very sensitive and detect a spark even in dust-gas mixture. Sensors can use other than
water extinguishing agent.
At the picture below you can see example of spark sensor and fire extinguishing system installation in a
pipeline. Sensors have detected sparks inside the pipeline and turned on the extinguishing system.
Control unit that monitors operation of the other system components and turns on alarm unit is installed at the
wall.
Pressure boost unit that increases extinguishing agent pressure to the necessary level is located under the
control unit.
Air fan is located in the bottom-left corner. Thermal cable controls it’s surface temperature. Malfunction of air fan
is the most common reason for dust explosions and fires.