Flammable gas detectorsThe sensor used is a type of gas sensor，A gas sensor is a device that effectively converts information such as the composition and concentration of a gas into information that can be used by people, instruments, computers, etc. So, how should we better choose the sensor of Flammable gas detectors?
First, the type of sensor should be determined according to the different measurement objects and measurement environments
Before proceeding with specific measurements, we first need to considerFlammable gas detectorsThe principle of the sensor that should be used needs to be determined after considering many factors. Because, even if the same physical quantity is measured, there are many principles of sensors available, and which principle of sensor is more suitable needs to be considered according to the characteristics of the measured and the use conditions of the sensor. It is recommended to consider the following specific issues: the size of the measuring range; the requirements of the measured position for the volume of the sensor; whether the measurement method is contact or non-contact; signal elicitation method, wired or non-contact measurement; The source of the sensor, whether it is domestic or imported, whether the price is affordable, or self-developed After considering the above issues, you can determine what type of sensor to choose, and then consider the specific performance indicators of the sensor.
Secondly, the choice of sensor sensitivity is also critical
In general, within the linear range of the sensor,Toxic gas detectorsThe higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing. However, the sensitivity of the sensor is high, and the external noise that is not related to the measurement is easy to be mixed in, and it will also be amplified by the amplification system, affecting the measurement accuracy. Therefore, the sensor itself should have a high signal-to-noise ratio to reduce the factory disturbance signal introduced from the outside as much as possible. The sensitivity of the sensor is directional. When the measured is a single vector and its directionality requirements are high, sensors with low sensitivity in other directions should be selected. If the measured vector is a multidimensional vector, the smaller the cross-sensitivity of the sensor, the better.
The frequency response characteristics of the sensor determine the frequency range to be measured, and the measurement conditions must be maintained without distortion in the allowable frequency range. The high frequency response of the sensor means that the frequency range of the measurable signal is wide, while due to the influence of structural characteristics, the inertia of the mechanical system is large, because the measurable signal frequency of the sensor with low frequency is lower. In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady-state, transient, random, etc.) to avoid excessive errors.
Finally, the linear range of the sensor is also an important part to consider
The linear range of a sensor refers to the range where the output is directly proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the greater its measuring range and the greater the measurement accuracy. When selecting a sensor, when sensing
After the type of instrument is determined, it is first necessary to see whether its measuring range meets the requirements. But in fact, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, the sensor with small nonlinear error can be approximately regarded as linear within a certain range, which will bring great convenience to the measurement.