This sensor is based on the micro fuel cell technology.
It is substantially made of a metallic anode, an electrolyte and a cathode
(fig. 1). The latter is exposed to the air through a capillary diffusion
barrier. When the gas diffuses through the diffusion barrier and meets the
electrolyte, a current , proportional to the gas concentration , is generated.
The electric signal has a linear diagram with a displacement error lower
than 0,5% in the worst case .
This sensor is very reliable and has great performances. It has also great
resistance to corrosion and it is not influenced by temperature and humidity
variations. So the sensor results stable for a long period of time.
This type of sensor has great technical performances, sensitivity, stability,
value repeatibility and great gas selectivity above all.

|
|
|
|
chlorine |
EV492CL2 |
0-250 |
|
carbon monoxide |
EV492CO |
0-500 |
|
ethylene oxide |
EV492ETO |
0-20 |
|
hydrogen chloride |
EV492HCL |
0-100 |
|
hydrogen cyanide |
EV492HCN |
0-100 |
|
hydrogen |
EV492H2 |
0-1000 |
|
hydrogen sulfide |
EV492H2S |
0-100 |
|
nitric oxide |
EV492NO |
0-250 |
|
nitric dioxide |
EV492NO2 |
0-20 |
|
sulphur dioxide |
EV492SO2 |
0-20 |
|
oxygen |
EV492O2 |
0-30% |
|
|
|
|
|
|
chlorine |
EV493CL2 |
0-250 |
|
|
carbon monoxide |
EV493CO |
0-500 |
|
|
ethylene oxide |
EV493ETO |
0-20 |
|
|
hydrogen chloride |
EV493HCL |
0-100 |
|
|
hydrogen cyanide |
EV493HCN |
0-100 |
|
|
hydrogen |
EV493H2 |
0-1000 |
|
|
hydrogen sulfide |
EV493H2S |
0-100 |
|
|
nitric oxide |
EV493NO |
0-250 |
|
|
nitric dioxide |
EV493NO2 |
0-20 |
|
|
sulphur dioxide |
EV493SO2 |
0-20 |
|
|
oxygen |
EV493O2 |
0-30% |
|
power supply: 12 - 24Vcc (+/-15%)
power: 1W max
nominal range: see table
analog output signal: 0 - 5V
relay output with 2 preset thesholds
temperature: -20 +50 °C
humidity: 15 - 90%
ambient pressure limit: 900 - 1100 mBar
pressure coefficient: 0,02 (%signal/mBar)
repeatability: 2%
long term output drift: < 5% signal/year
operating time delay: <120 sec.
response time: > 20 sec
operating life: 2 years
explosion proof aluminium alloy box
execution: Ex d II C T6
IP rating: IP65
certification: CESI EX -
96.108 X/N
construction in accordance with standards: EN50014 - EN50018-EN50020
- EN50054 - EN50057 - CEI 64-2
quality approval: BS5750Pt3 - ISO9002 - EN29002
cable entry: 3/4" - UNI 6125 - ISO R7 - BS 21

These models differ from explosion proof models for the PL suffix. Exsample: EV492NO PL is NO elettrochemical sensor with IP65 execution.
power supply: 12 - 24Vcc (+/-15%)
power: 1W max
nominal range: see table
analog output signal: 0 - 5V
relay output with 2 preset thesholds
temperature: -20 +50 °C
humidity: 15 - 90%
ambient pressure limit: 900 - 1100 mBar
pressure coefficient: 0,02 (%signal/mBar)
repeatability: 2%
long term output drift: < 5% signal/year
operating time delay: <120 sec.
response time: > 20 sec
operating life: 2 years
enclosure: polycarbonate plastic
IP rating: IP65
construction in accordance with standards: EN50054 - EN50057
quality approval: BS5750Pt3 - ISO9002 - EN29002