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Gas transmitter - ADOS LCTR 903

The gas transmitter ADOS LCTR 903 is suitable for the detection of combustible gases, for example hydrogen, methane (natural gas) or propane?/?butane (LPG) in air in the LEL region.

Two transmitter versions with different output signals are available:
- 3-wire 4–20 mA
- 4-wire LON? (LCTR 904)

Three measuring principles are available:
- VQ
- TGS
- IR

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Technical data

Type	TGS	VQ	IR
Measurement method:	Semiconductor	Heat reduction	Infrared
Measurement range:	ppm ranges to 100 % LEL	ppm ranges to 100 % LEL	0–100 % LEL CH₄, C₃H₈, C₂H₂ 0–100 Vol % CH₄ 0–1, 2, 3, 4, 5 Vol % CO₂
Percentage error of f.s.d.:	± 5 %	± 5 %	± 3 %
Linearity:	< 15 % of f.s.d.	< 3 % of f.s.d.	< 3 % of f.s.d.
Temperature range:	-20 °C to +45 °C	-20 °C to +45 °C	-20 °C to +45 °C
Temperature effect:	5 %	2 %	8 %
Response time (t₉₀):	approx. 20 sec.	approx. 20 sec.	< 30 sec.
Pressure effect:	1 %	1 %	1 %
Mounting position:	optional	optional	optional
Application:	Poisonous, combustible and explosive gases in the LEL region	Poisonous, combustible and explosive gases in the LEL region	Poisonous, combustible and explosive gases in the LEL region
Expected operation time for sensor:	> 2 years	> 2 years	approx. 5 years
Supply voltage:	15V - 30V	15V - 30V	15V - 30V
Interface:	4–20 mA three-wire or LON^® fourwire techniques (LCTR 404), galvanically isolated, data transmission 78 kbps	4–20 mA three-wire or LON^® fourwire techniques (LCTR 404), galvanically isolated, data transmission 78 kbps	4–20 mA three-wire or LON^® fourwire techniques (LCTR 404), galvanically isolated, data transmission 78 kbps
Protection class:	IP 30	IP 30	IP 30
Dimensions (height x diameter):	80 x 80 mm	80 x 80 mm	80 x 80 mm
Weight:	500 g	500 g	500 g

The TGS sensor
The TGS sensor contains a semiconductor sensor,
which is constructed on SnO₂ -sintered N-substrate.
When combustible or reducing gases are absorbed by the surface of the sensor, the concentration of the test gas is determined by the change in conductivity.

1 = Circuit voltage
2 = Heating voltage
3 = Load resistor

The VQ sensor
The head of the VQ sensor functions on the principle of heat reaction. When combustible or reducing gases or vapours come in contact with the measuring element, they are subjected to catalytic combustion, which causes a rise in temperature. This rise causes a change in the resistance of the measuring element which is used as a measure of the component of gas being tested. The inert element is for compensating the temperature and conductivity of the test gas.

1 = Catalyzer pellistor
2 = Electric connections
3 = Inert pellistor
4 = Diffusion filter

The IR sensor
The test gas flows through a measurement chamber that incorporates an IR radiating source and a two-channel infrared detector. The intensity of the infrared radiation is reduced as it passes through the gas molecules. The concentration of the gas can then be calculated by the magnitude of the reduction in intensity. Since only absorption of the wavelength (A) specific to the gas under test in relation to the wavelength (B) not absorbed by a test gas is considered, interference due to dust, ageing etc., is almost fully compensated.

1 = Infrared-radiation source
2 = Test gas
3 = Diffusion filter
4 = Infrared-detector
5 = Measurement chamber

Gas fired boiler systems
Gas distribution station
Gas transfer station
Battery charging station

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