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GfG is a world leader for gas detection and measurement technology. For over 40 years GfG has specialized in designing, developing and producing the safest and most reliable equipment and sensors available.
GfG offers an extensive range of portable monitors and fixed systems. The product range includes sensors, the world´s smallest gas monitors, micro-processor controlled multi-gas detectors and computer aided system solutions. GfG provides diverse solutios for Toxic, Explosive and Oxygen gas detection in air and water.
GfG equipement is used in a variety of applications and industries including automotive, chemical industries, landfills, steel industries, hospitals, mining, public utilities, food processing, research institutes, universities and wherever the protection of life and property is needed.
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DiaMon analyzers are the pioneers of on-line process monitoring measuring several chemical parameters automatically in a single instrument.
- Multi-parameter on-line analyzer
- For waste water treatment plants, rivers, lakes and coastal waters
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gas sensor
- Aperometric 3 electrode sensor element
- No carbon dioxide cross reference
- High reliability
description
Sensor for measuring ammonia gas
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The sensing element of TGS826 is a metal oxide semiconductor which has low conductivity in clean air. In the presence of a detectable gas, the sensor's conductivity increases depending on the gas concentration in the air. A simple electrical circuit can convert the change in conductivity to an output signal which corresponds to the gas concentration.
The TGS826 has high sensitivity to ammonia gas. The sensor can detect concentrations as low as 30ppm in the air and is ideally suited to critical safety-related applications such as the detection of ammonia leaks in refrigeration systems and ammonia detection in the agricultural field.
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Features:
- Detection range of <25 to 10,000 ppm ammonia (NH3).
- High selectivity to ammonia.
- Minimal response to changing environmental humidity.
- Response is unaffected by prolonged exposures to, or high concentrations of ammonia.
- Sensor response is not affected by H2S.
Circuitry
A transducer is available from Synkera to operate the sensor. This circuit,
packaged on a 2" x 1.5" printed circuit board, is powered with 9 - 24 VDC. The transducer provides a 0 - 5 VDC output which can be adjusted for sensor offset and gain. The heater voltage is also adjustable. The circuit is set to the
recommended values at the factory.
Basic Measuring Circuit
The sensor can be operated using a simple voltage divider. This requires two voltage supplies: heater voltage (VH) and circuit voltage (VC). VH is applied to the heater in order to maintain a constant, elevated temperature, for optimum sensing.
VC is applied to allow a measurement of the output voltage (Vout) across a load resistor (RL).
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