Detection systems

ASEKO Detection Systems (ADS)

For detection of dangerous gases and vapors in environment of production, boiler rooms, gas plants, paint shops, freezers, warehouses, underground garages and other comerical spaces. With help of four-level control unit evaluates current from up to 8 concentration sensors. Control unit converts the signal to relay outputs to 10%, 20%, 30%, 40% and 50% of the sensor range.

Concentration is 10%
I. relay will open and start first level of ventilation.
Concentration is 20%
II. relay will open and start second level of ventilation.
Concentration is 40%
III. relay will open and lights up the warning signs.
Concentration is 50%
IV. relay will open and start warning sirens.

With connector RS485 it is possible to connnect up to 9 ASIN ACU`s control units with ASIN M monitoring. In one moment you can monitor up to 72 sensors. Thanks to RS485 you can integrate ASIN M into master control system.

Detected substances




Amonia, NH3
Ethylene, CH2CH2O
Freons, R134 A, R1234yf
Chlorine, Cl2
Oxygene, O2
Methane, CH4 – CNG, earth gas
Propane, C3H8 – LPG
Hydrogen sulfide, H2S
Hydrogen, H2

Diethyl ether
Ethyl acetate

Nitric oxide, NO
Carbon monoxide, CO
Carbon dioxide, CO2

Sensor casing

Sensors with standart protection IP20

Sensors are intendet for use in normal environment. Easy installation and maintenance.
Calibration by replacement

Protection: IP20
Operating temperature: 0 to +40°C
Relative humidity: 0–90% rh

Sensors with high protection IP62

Sensors are intendet for use in normal environment with higher protection needs.
Sensors can be equipped with water resistant case and heating for applications in low temperatures.

Protection: IP62, sensors with high protection IP62
Operating temperature: 0 to +40°C, with heating to -40°C
Relative humidity: 0–90% rh

Sensors with explosion hazard protection EX

Sensors are intedet for use in environment with explosin hazard.
Case of the sensor is robust from high grade aluminium. Certification Ex II 2G Ex d IIB T6 Gb.

Protection: IP60
Operating temperature: 0 to +40°C
Relative humidity: 0–90% rh

Wall-mounted ASIN GT with pump (gas intake)

Are equipped with electrochemical, catalytic or infrared sensors. Current loop (4-20mA) signal is directly proportional to measured concentration. Equipped with pump for measured gas. ASIN ACU functions can be added. Measure one or two components of the gas.

Protection: IP20
Operating temperature: 0 to +40°C
Relative humidity: 0–90% rh

Sensor types

Electrochemical sensors GTE

Electrochemical sensing devices basically consist of electrodes surrounded by an electrolyte solution enclosed behind a gas permeable, hydrophobic membrane. Gas molecules diffuse across the membrane to enter the electrode/ electrolyte interface where chemical and electrochemical reactions occur to generate measurable electrical current flow. Main advantages are high sensitivity, excellent selectivity and linear response. Disadvantage is relative short lifespan, average is 2 years.

Infrared sensors GTO

Infrared detectors are based on the principle of infrared absorption by gas molecules at specific wavelengths in the infrared region. The ASEKO sensor utilizes linear NDIR. The active detector is covered by an optical filter that allows transmission of infrared radiation at a specified wavelength where the target gas is known to absorb.

Catalytic sensors GTC

These sensors respond to all combustible materials and are applicable only for measurements in air or gases with sufficient oxygen concentration. Catalytic bead combustible gas sensors basically consist of hot filaments (active and reference elements) enclosed behind a sintered stainless steel flame arrestor. The active element is treated with a catalyst to effectively burn or oxidize the gas while the reference element is nonreactive and provides compensation for ambient conditions; temperature and humidity.

Semiconductor sensors GTS

Solid-State sensors utilize thick or thin film metal oxides deposited on a ceramic substrate that is maintained at constant temperature using an integral heater element. When the metal oxide film is exposed to gas, molecules are adsorbed along the surface which alters the electrical resistance. The operating temperature ensures optimum response characteristics for the specific type of gas over the designated detection range. The change in electrical resistance is converted into meter indication for read-out of gas concentration. The detector is optimized for a particular compound (family of compounds), but is less specific than other methods related to the broader range of compounds that can be adsorbed on the sensor surface.

Detection systems for underground garages

For detection of carbon monoxide in underground garages we offer four-level detection based on requirements of EU. Also sensors for LPG, CNG, nitrogen oxides. Warning signs and sirens.

Components of the detection system

Main unit of the detection system
GTE basic
Carbon monoxide, CO, 0-240ppm
GTC basic
Methane, CH4, (CNG) 0-2,5%%
GTC basic
Propane, C3H8, (LPG) 0-1,0%
Power supply 24V / 60W
Warning siren
Warning sign
Flooding sensor

Application of the detection system in construction

Detection systems for boiler rooms

ADS detection system provides full coverage of boiler room. Detection of heating gas (earth gas or propane) also detection of hygienically dangerous concentration of carbon monoxide and detection of criticaly high temperature and boiler room flooding. For complete system we provide sirens and warning signs.

Components of the detection system

Main unit of the detection system
Methane, CH4, (CNG) 0-2,5%
Propane, C3H8, (LPG) 0-1,0%
Carbon monoxide, CO, 0-240ppm
Power supply 24V / 60W
Warning siren
Warning sign
Warning sign
Flooding sensor
Temperature sensor

Application of the detection system in construction


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For older ASEKO devices that are no longer in production, you will find certificates and declarations in the ARCHIVE folder.