Ammonia Gas Detector : for the Detection of Ammonia
The sensing element of Ammonia Gas Detector 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 Ammonia Gas Detector 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. We are manufacturer, exporter and supplier of ammonia gas detector which offered at best possible prices.It has been fabricated with high-tech methodologies using well tested material at our manufacturing unit. The company has gained good name at the apex of listed well established ammonia gas detectors manufacturers, exporters and suppliers in India.
* High sensitivity to ammonia
* Quick response to low concentrations of ammonia
* Uses simple electrical circuit
* Ceramic base resistant to severe environment
* Ammonia leak detection in refrigerators
* Ventilation control for the agricultural and poultry industries
The figure below represents typical sensitivity characteristics, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor
resistance ratio (Rs/Ro) which is defined as follows:
Rs = Sensor resistance of displayed gases at various concentrations
Ro = Sensor resistance at 50ppm of ammonia
The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-axis is indicated as sensor resistance ratio (Rs/Ro), defined as follows:
Rs = Sensor resistance at 50ppm of ammonia at various temperatures/humidities
Ro = Sensor resistance at 50ppm of ammonia at 20�C and 65% R.H.
Pin Connection and Basic Measuring Circuit :
The numbers shown around the sensor symbol in the circuit diagram at the right correspond with the pin numbers shown in the sensor's structure drawing (above). Since the sensor has a polarity, DC voltage is always required for circuit voltage (a white dot indicates pin 2). When the sensor is connected as shown in the basic circuit, output across the Load Resistor (VRL) increases as the sensor's resistance (Rs) decreases, depending on gas concentration.
Sensing Element :
Metal oxide is sintered to form a thick film on the surface of an alumina ceramic tube which contains an internal heater.
The TGS 826 sensor has a wide specification range in terms of its rated value in 50ppm of NH3 and sensor resistance ratio (Rs in 150ppm of NH3 / Rs in 50ppm of NH3). To facilitate usage of this sensor, TGS 826 is shipped in pre-sorted groupings of 20 pieces per bag, with each bag marked with one of the following group numbers which indicate a more narrow range within the specification.
Please be advised that the sensor is produced to meet the overall specification range--production of specific groupings within the spec cannot be done. As a result, if a user requests a specific group(s), the sensor can be made available at an additional charge, but no guarantee can be offered as to availability for shipment. The minimum delivery time for special group selection should be considered at 8 weeks minimum.