Sensor sensitivity?
The sensitivity of the gas sensor refers to the sensitivity of the device to the gas to be measured. The sensitivity is usually expressed by the ratio of the resistance of the gas sensor in a certain concentration of detection gas to the resistance in normal air.
What is the definition of sensor?
According to the National Standard of the People's Republic of China (GB7665-87), the definition of a sensor is: a device or device that can be measured and converted into a usable output signal according to a certain rule, usually composed of sensitive elements and conversion elements. Among them, the sensitive element refers to the part of the sensor that can directly feel or respond to the measured part; the conversion element refers to the part of the sensor that can convert the measured part of the sensor that can be sensed or responded by the sensitive element into an electrical signal suitable for transmission or measurement.
Long-term stability of gas detectors?
When the gas concentration is constant, if other conditions change, the ability of the output characteristics of the gas sensor to maintain the same within a specified time. It represents the resistance of the gas sensor to factors other than gas concentration.
What is the difference between split line and bus system?
The bus and the breakout are in terms of how the controller is linked to the detector. If each detector needs a wire to complete the communication with the controller, the connection method is called branch connection. If several detectors can share a wire to complete the communication with the controller, this connection method is called bus connection. The bus generally transmits digital signals, and it has many forms, such as RS485 bus; CAN bus and so on.
What is a standard gas?
Standard gas refers to the gas industry term, and standard gas belongs to standard substance. Reference materials are highly homogeneous, well-stabilized and quantitatively accurate determination standards. They have the basic function of reproducing, preserving and transmitting quantitative values. They are used in the fields of physical, chemical, biological and engineering measurement to calibrate measuring instruments and measuring processes. , evaluate the accuracy of the measurement method and the testing ability of the testing laboratory, determine the characteristic value of the material or product, and conduct quantitative arbitration, etc.
What does calibration mean?
Calibration refers to the calibration of the indication value of the detector with a certain concentration of standard gas, generally including zero calibration and span calibration. Zero calibration generally refers to calibration performed in a high-purity nitrogen or clean air environment. Span point calibration refers to the calibration of the detector with a certain concentration of standard gas.
