EsiWelma s.r.l.
rev. 00 of 01-09-10 / pg. 1
ESN.F.D.._en
Carbon dioxide (CO2) detectors
for homes, recreational vehicles, workplaces and
more in general, in public or private places with a
high concentration of people.
ESN.F.D..
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Electronic microprocessor Carbon Dioxide (CO
2
) detectors
Display of carbon dioxide measurement in addition to ambient temperature, relative humidity and the
operational status of the detector, on large LCD screen
NDIR (nondispersive infrared) carbon dioxide detection technology ABC Logic™ self-calibration system
(automatic calibration)
Measuring range 0…20,000 ppm of CO2 (other ranges on request)
Power supply 230Vac, 115Vac, 24Vac/dc (see models)
Relay command output with potential-free contact (SPST 230Vac / 3A, or 30Vdc / 3A), suitable for any
command or alarm device.
Optional measurement outputs 4…20mA or 0…10Vdc (see models)
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Use
The ESN.F.D.. detectors can be used to measure the concentration of Carbon Dioxide and
to command transmitters or actuating devices where there are abnormal concentrations well
below the gas hazard threshold.
The ESN.F.D.. detectors can also be used to monitor Carbon Dioxide as an indication of the
quality of the air in hotels, offices, exhibition centres, shops, restaurants, schools, conference
rooms, cinemas, theatres and ventilation systems in general.
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Operation
At the end of the warm-up phase, during which the detector is inactive, it enters normal
operation mode, and will continue in this state until it detects gas.
When the gas
concentration exceeds the threshold set-points, the detector senses its presence and goes
into the alarm condition indicated by the activation of the relay and by the relative display
symbol coming on.
250...…350 ppm
level of the air in outdoor environment (normal)
350...…1000 ppm
typical level found in living spaces with good air circulation
1000…...2000 ppm
level associated with drowsiness and lack of air
2000…...5000 ppm
level associated with headache, drowsiness and stale, stagnant air like
a closed room. This could cause lack of concentration, loss of atten-
tion, increased heartbeat and slight nausea
> 5000 ppm
exposure could lead to a serious lack of oxygen resulting in brain da-
mage, coma and death.
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Power supply
Outputs
230Vac
115Vac
24Vac/dc
SPST relay
ESN.F.D.A.R ESN.F.D.D.R ESN.F.D.E.R
SPST relay + 4...20mA
ESN.F.D.A.I ESN.F.D.D.I ESN.F.D.E.I
SPST relay + 0...10Vdc
ESN.F.D.A.V ESN.F.D.D.V ESN.F.D.E.V
For special versions, please contact Customer Service.
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Levels of CO
2
and effects on
humans
Available
models
and ordering
information
