First of all, the structure of the sensor must be selected so that the temperature of the measured flow or the measured surface can be reached within the specified measurement time of the sensor.The output of the temperature sensor is only the temperature on the sensing element.In fact, to make sure that the temperature of the sensor indicates the temperature of the measured object is, often in very difficult in most cases, the selection of temperature sensor, to consider the following several aspects of the temperature of the object to be tested whether need to record, alarm and automatic control, whether you need the size of the distance measuring and transmitting temperature measuring range and accuracy temperature measuring element size is appropriate in the object being measured temperature change over time, the lagging of the temperature measuring device can meet the requirements for measuring temperature measured whether the object of environmental conditions on the temperature measuring element beneath the price such as insurance, will it be convenient for using the choice of the temperature sensor is mainly based on the measurement range.

Platinum resistance sensors can be used when the measurement range is expected to be within the total range.Narrow ranges generally require that the sensor must have a fairly high base resistance in order to obtain a large enough resistance change.Thermistors provide enough resistance variation to make these sensing elements very suitable for narrow measurement ranges.

Thermocouple is more suitable if the measurement range is quite large.The freezing point is also included in this range, the wire harness because the thermocouple's scale meter is based on this temperature.The linearity of the sensor within the known range may also be an additional condition for selecting the sensor.The response time is usually expressed as a time constant, which is another basic basis for selecting a sensor.

The time constant is less important when monitoring the temperature in the tank.However, when the temperature in the vibrator must be measured during use, the time constant becomes the determining factor in selecting the sensor.Bead type thermistor and armoured outcrop type thermocouple time constant is fairly small, and immersion probe, especially the thermocouple with protective casing, time constant is large dynamic temperature measurement is complicated, it is only through repeated tests, as far as possible close to simulate the condition of the sensor used in frequent, to achieve reasonable approximate sensor dynamic performance.What are the main features of the linear NTC temperature sensor?The main feature of this temperature sensor is that the temperature-voltage relationship is a straight line in the operating temperature range. For the secondary development of temperature measurement and temperature control circuit design, the temperature sensor can complete the design of temperature measurement or temperature control circuit without linearization, thus simplifying the design and debugging of the instrument.How is the temperature range of the linear NTC temperature sensor defined?

Generally speaking, the temperature range can be between -200 ~ +200℃, but considering the actual needs, such a wide temperature range is generally not necessary. Therefore, three different sections are stipulated to suit different packaging designs, and the selection of extension lines is also different.For the linear thermal sensor dedicated to temperature compensation, the operating temperature range is only set to -40℃ ~ +80℃.It can satisfy the general circuit temperature compensation.

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