Notes On The Detected Gas - Tecnocontrol SE237E Série Manuel D'utilisation

IST-2237.EC01.01
1-Modello
SE237EA
100ppm Ammoniaca (NH
SE237EA-H
SE237EC-S
300ppm Monossido di carbonio(CO) in azoto
SE237EC-H
SE237ES 10ppm Biossido di zolfo (SO
SE237EH 50ppm Idrogeno solforato (H
SE237EHCN 10ppm Acido cianidrico (HCN) in azoto
SE237EN 100ppm Ossido d'azoto (NO) in azoto
SE237EN2 30ppm Biossido d'azoto (NO
SE237EHCL 10ppm Acido cloridrico (HCL) in azoto
SE237ECL 10ppm Biossido d'azoto (NO
EN
DESCRIPTION
The SE237E series are stand-alone gas detectors able to detect toxic gases by employing an electrochemical sen-
sor calibrated to different gases and find their best application in centralized alarm systems for parking, laborato-
ries, manufacturing industries and environments to be protected from possible leakage of gas.
The instruments comprise of a thermoplastic enclosure in which the electronic circuit and the terminals are mount-
ed and a downward facing cylindrical sensor housing with inside a "Replaceable Cartridge Sensor".
The SE237E series have three alarm levels, with different set-up, depending on the models, as listed in
The outputs are relays with tension free single pole contacts (SPST). The instrument has also a 4÷20mA linear output
(S) with F.S. of the detected gas, expressed in ppm (part per million). This output can be used to connect a remote
central unit and / or for Test and Calibration routine, code protected, by using the F1 and F2 keys, placed on the
front panel, on which there are 5 Led that indicate:
rd
3 red Led "ALARM 3":
nd
2 red Led "ALARM 2":
st
1 red Led "ALARM 1":
Green Led "ON":
Yellow Led "FAULT":

NOTES ON THE DETECTED GAS

The above Gas value is on compliance with EN61779-1.
SE237EA has a sensor that can detect Ammonia (NH
pungent smell, lighter than air, (its density as to air is 0.6). His TWA is 25ppm (Time-Weighted Average) and STEL is
35ppm (Short Term Exposure Limit). His LEL (Lower Explosivity Limit) is 15% v/v (volume). This gas is irritating to the eyes
and mucous membranes (respiratory and digestive tracts). Ammonia is used in industrial refrigeration applications.
It is also used as fertilizers (either as its salts), as a component in paints, for the production of plastics and poly-
mers, such as solvent or as household cleaners.
SE237EA-H model is as previous, but it uses a sensor suitable for industry and polluted environments and with
presence of other toxic gases.
SE237EC-S has a sensor that can detect Carbon monoxide (CO) gas which is a poisonous, colourless, odour-
less, and tasteless. CO is a little lighter than air (its density as to air is 0.97) and his LEL (Lower Explosive Limit) is
10.9%v/v (%volume). His TWA is 25 ppm (Time-Weighted Average) and STEL is 50 ppm (Short Term Exposure Limit).
CO is produced by incomplete burning of carbon-based fuels, including gas, oil, wood and coal. Carbon-based
fuels are safe to use. It is only when the fuel does not burn properly that excess CO is produced, which is poison-
ous. When CO enters the body, it prevents the blood from bringing oxygen to cells, tissues, and organs.
SE237EC-H model is as previous, but it uses a sensor suitable for industry and polluted environments and with
presence of other toxic gases.
SE237ES has a sensor that can detect Sulphur dioxide (SO
ide) gas which is a toxic, colourless, with pungent odour, heavier than air (its density as to air is 2.25). His TWA (Time-
Weighted Average) is 2 ppm and STEL (Short Term Exposure Limit) is 5 ppm.
SO is a strong irritant to eyes and respiratory system. Inhalation may cause pulmonary edema and prolonged ex-
2
posure can lead to death and when it combines with water forms H
SE237EH has a sensor that can detect Hydrogen sulphide (H
toxic, flammable, colourless, with a characteristic odour of rotten eggs, heavier than air (its density as to air is 1.19).
His TWA is 5ppm (Time-Weighted Average) and STEL is 10 ppm (Short Term Exposure Limit). His LEL (Lower Explosive Limit)
is 4% volume. The H S smell is perceived at concentrations above 0.2 ppm, to low levels (50÷100 ppm) already
2
produces irritation to the eyes and throat, cough, fast breathing and training of fluid in the respiratory tract. This
gas, over 150 ppm, acts on the olfactory nerve, making it impossible for the perception of its odour, and higher
concentrations can cause unconsciousness within a few minutes and can lead to death.
SE237EHCN has a sensor that can detect Hydrogen cyanide (HCN) (synonymous with Hydrocyanic acid, Prussic acid)
gas which is a toxic, extremely poisonous gas, colourless, with has an almond-like odour, a little lighter than air
(its density as to air is 0.94). His TWA (Time-Weighted Average) is 4.7 ppm and STEL (Short Term Exposure Limit) is 10 ppm.
The HCN is a strong irritant to eyes and respiratory system. Inhalation may cause effects on the cellular respira-
tion, resulting in convulsions and unconsciousness. Exposure to 300ppm for 2 minutes may result in death.
TECNOCONTROL S.r.l. - Via Miglioli, 47 20090 SEGRATE (MI)
Istruzione / User's Manual / Manuel d'utilisation
2-Gas da utilizzare
) in azoto
3
) in azoto
2
S) in azoto
2
) in aria
2
) in aria
2
rd
3 relay activation
nd
2 relay activation
st
1 relay activation
normal working condition
the sensor should be faulty, disconnected, out of scale or expired.
3-Flussomentro 4-TEST mA 5-Uscita in mA 6-Indicazione in ppm
0,3 l/min
90÷96 mV
1 l/min
0,3 l/min 190÷210 mV
0,3 l/min 118÷122 mV 11,7÷12,3 mA
0,3 l/min 117÷123 mV 11,7÷12,3 mA
0,3÷0,5 l/min 192÷208 mV 19,2÷20,8 mA
0,3 l/min 192÷208 mV 19,2÷20,8 mA
1 l/min 190÷210 mV
0,3÷0,5 l/min 192÷208 mV 19,2÷20,8 mA
1 l/min 192÷208 mV 19,2÷20,8 mA
) gas which is a toxic, colourless and with a characteristic
3
) (also Sulphurous anhydride, Sulphurous oxide, Sulphur ox-
2
S (Hydrogen sulphide).
2
S) (synonymous with hydrogen sulphide) gas which is a
2
Tel. +39 02 26922890 - Fax +39 02 2133734
Pag.8/20
9,0÷9,6 mA 100 ppm (±5)
19÷21 mA 300 ppm (±20)
10.0 ppm (±0.5)
50 ppm (±2)
10.0 ppm (±1)
100 ppm (±5)
19÷21 mA 30 ppm (±2)
10 ppm (±1)
10.0 ppm (±0,5)
Tables 5÷11.