GTR 210

The gas transmitter ADOS GTR 210 is suitable for continuous measurement of gases in normal areas and areas where there are risks of explosion.

Available basic versions:
– Ex-version: with current interface 4-20 mA
– Standard: 4-20 mA or LON^®-4-wire techniques
– Comfort: 4-20 mA, with additional changeover
   contacts for alarms and failure

By employing 6 different types of sensor, noxious, explosive and non-combustible gases and vapours can be measured.

Display of the measured gas concentration and the adjustable alarm thresholds, are shown on a multi-colour graphic display. The keyboard input is by way of a touchpad.

A current signal is generated that is proportional to the measured concentration of gas, which is transmitted to an evaluation unit placed in a safe area, away from any dangers of explosion.

The type test of the explosion-protected gas transmitter, is completed by the DEKRA.

ATEX certificate: DEKRA 11ATEX0257 X
IECEx certificate: IECEx DEK 11.0090 X
Type of protection: Ex d e ia mb IIC T4 Gb
SIL 1 & functional test:
ATEX Certificate –> BVS 12 ATEX G 001 X

• Chemical industry
• Manufacture of paints and varnishes
• Plastics processing plants
• Sewage works
• Gas-fired boiler systems
• Liquid gas storage houses
• Laboratories
• Oxygen concentration measurements
• Refineries
• Cold storage houses (Ammonia monitoring)
• Paint spraying booths
• ... and many more.

NEW!
Advanced field of application: marine (option MED)
The gas transmitter product family GTR 210 with the option MED fulfills the requirements of the Marine Equipment Directive 96/98/EC and its annual updated addendum 2013/52EU. The conformity with the above mentioned regulation has been certified by the ship safety division of the German Government Safety Organisation for Transport and Transport Economies. The compliance with international IEC standards and the durability against saltwater was verified. The gastransmitter GTR 210 can now be installed under deck as well as on deck (weather zone) under harsh conditions.

The field of application extends to:

• gas tankers
• container ships
• offshore platforms
• applications in aggressive environments

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 specific to the gas under test in relation to the wavelength not absorbed by a test gas is considered, interference due to dust, ageing etc., is almost compensated.

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

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 TOX sensor is a measurement system with electro-chemical cell, where the sampled gas is measured by diffusion. In the case of oxygen measurement the oxygen content is in an electrolyte, thus producing a small flow of current (electro-chemical process).
At a constant air pressure, this current is directly proportional to the oxygen concentration in the sampled air.

1 = Anode
2 = Electrolyte
3 = Cathode
4 = Diffusion path
5 = Diffusion filter
6 = Test gas

The GOW sensor functions on the principle of thermal conductivity. Two rhenium-tungsten resistors are used as a measuring element, where the comparison element is subjected to normal ambient air and the measuring element is subjected to the test gas. Any change in the concentration of gas at the measurement element, causes a change in temperature, which is due to the variation of conductivity.
The resultant change in resistance is a direct measure of the gas concentration.

1 = Diffusion filter
2 = Test resistor
3 = Comparison resistor

The sampled gas flows through a measurement chamber, that incorporates a UV radiating source and a pair of
electrodes with opposing polarity. The gas molecules to be detected are ionized by the UV radiation.
The resulting positively charged molecules and the electrons are attracted to the relevant electrode. The current generated is a measure of the gas concentration.

Using the PID measuring head, volatile organic compounds (VOC) can be measured, the ionisation potential of which is less than the energy in the UV radiating source (10,6 eV), e.g. aromatic hydrocarbons like toluol (C₇H₈) and xylene (C₈H₁₀) as well as chlorinated hydrocarbons like trichloroethylene (CHCl₃). The detection of toxic gases like phosphine (PH₃) is also possible.

1 = UV radiating source
2 = Test gas
3 = Capacitive charge
      measurement

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