Navim Group Company EsiWelma Sensigas ESN.F.O Series Manual

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Electronic carbon monoxide detectors with time-varying alarm threshold and three calibration points for
homes, recreational vehicles and similar sites.
230Vac, 12Vac/dc or 12...24Vac/dc power supply, depending on the model.
Relay command output with voltage free contact, so suitable for any kind of solenoid valve or other
command and alarm device.
Possibility of parallel connection of more than one detector, also for monitoring different gases.
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Use

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Operation

Gas detection

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Available
models
and ordering
information
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The ESN.F.O.. detectors can be used to provide a visual/audible alarm and to control
other alarm transmitters or actuating devices, in the presence of carbon monoxide
concentrations that pose a hazard to humans from gas poisoning.
The detector will enter a warm-up phase after power-up; this will take about 5 seconds
and during this time the detector activates all its visual and audible alarms in sequence.
At the end of the initial test and warm-up phase (about one minute), the detector enters
normal operation mode, and will continue in this state until it detects gas or until the
detector fails.
In conformity with the requirements of European standard EN50291, the monitoring
algorithm used for gas detection is "time-varying alarm threshold" that considers both
the concentration of the gas and the time it is detected.
A threshold level one, set at about 50ppm
remains at this value the alarm will activate after a time limit of 60 to 90 minutes; at a
concentration level of 100ppm the detector will enter alarm condition after a time limit of
10 to 40 minutes; if the concentration level is 300ppm (or higher) the alarm will go off
immediately (within 3 minutes).
Intermediate concentration values require proportionately intermediate alarm times.
Once the alarm condition ceases to exist, the detector will be restored to normal
operation.
(1)
ppm = parts per million of concentration of gas in the air.
Power supply
Detector
Type A
Type B
Type A = with command output to SPDT relay 8A / 250Vac
Type B = only visual/audible alarm (no command output)
Wall-mounted
Carbon Monoxide
detectors
for homes, recreational vehicles
and similar sites
ESN.F.O..
Conformity standard EN50291
(1)
, sets off the time meter; if the concentration
230Vac 12Vac/dc
ESN.F.O.A ESN.F.O.A.D
ESN.F.O.B ESN.F.O.B.D
EW076.305
12...24Vac/dc
ESN.F.O.A.E
ESN.F.O.B.E
rev. 05 of 15-01-20 / pag. 1