RTD sensor classification: 1, NTC thermistor sensors: Sensors such as a negative temperature coefficient sensors, that sensor resistance decreases with increasing temperature. 2, PTC thermistor sensors: Sensors such as a positive temperature coefficient Sensor that sensor resistance increases with increasing temperature. The use of laser technology to measure sensor. It consists of a laser, a laser detector and the measurement circuit. The laser sensor is a new measuring instruments, it is able to realize the advantages of non-contact distance measurement speed, high precision, large-scale, anti-light, electrical interference ability and so on. Laser sensors work sensor supplier, first aim the laser emitting diode emits a laser pulse. After the target reflected laser scattering in all directions. What part of the scattered light returns to the sensor is a sensor receiver, after being imaged onto a receiving optical system avalanche photodiode. Avalanche photodiode is an optical sensor having an internal amplification function, so that it can detect very weak optical signal, and converts it into a corresponding electrical signal. Constitute its basic sensor: a basic single conversion device. Combined sensor: the sensor is a combination of different single converting means constituted. Applied Sensor: basic sensor is a sensor or a combination of sensor combinations with other agencies constituted. Form according to the role by role type can be divided into active and passive sensors. Active sensors have the role of type and reaction type, such a sensor can be issued for a certain measured object detection signal, the sensor can detect changes in the measured object detection signal quotation generated in, or generated by the detection signal in the test object to form some kind of effect signal. Known effect type, formed in response to the detection signal generating method known reaction type detecting signal change detection method. Radar and radio frequency range detector is acting instance, while the photoacoustic effect analysis device with laser analyzer is counterproductive type instances. Passive sensors only receive signals measured object itself, such as infrared radiation thermometer, infrared camera and the like. Sensor Supply | Xinfeng (certified) | Sensors Sensing by Xinxiang City Xinfeng purification technology Limited. Xinxiang City Xinfeng purification Sensing Technology Co., Ltd. (www.xfcgq.com) is an industry leader in Henan Xinxiang, sensors, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Xinfeng leadership with the staff warmly welcome all inquiries negotiations to create a better future Xinfeng.