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Select Several Key Considerations When Selecting Temperature Sensor

- Jul 03, 2017 -

Select several key considerations when selecting Temperature Sensor

How much pressure does the Temperature Sensor measure apply to?

A: the first thing you need to know is the maximum pressure value you need in your system. The maximum pressure range of the Temperature Sensor that needs to be selected should be 1.5 times the maximum pressure value of the system. These additional pressure ranges are due to many systems, especially water pressure and process control, with pressure spikes or continuous pulses. These peaks may be five to 10 times as high as the "maximum" pressure, which can cause damage to Temperature Sensor. Continuous high voltage pulse, close to or above the maximum rated pressure of Temperature Sensor, can also shorten the life of Temperature Sensor. So just raising the Temperature Sensor ratings is not foolproof, because it sacrifices the resolution of the Temperature Sensor. You can also use a buffer to reduce the spike, but this is only a compromise because it reduces the response speed of the Temperature Sensor.

What accuracy does the Temperature Sensor need to achieve?

A: accuracy is a common term used in the industry to describe the output errors of Temperature Sensor. It comes from non-linear, hysteresis, nonrepeatability, temperature, zero - point balance, correction and humidity effect. Usually we specify precision as nonlinear, hysteresis and non-repeatability. For many Temperature Sensor, "precision" can be lower than the nominal value due to temperature, zero balance, etc. The cost of a Temperature Sensor with a higher accuracy would be higher, so would the corresponding system really need such a high degree of precision? A system with high precision Temperature Sensor and low-resolution instruments is a low-efficiency solution.

What is the Temperature Sensor's temperature resistance?

A: Temperature Sensor, like all physical device systems, can produce errors and can't even be used in extreme temperatures. Typically each Temperature Sensor will have two temperature ranges, the range of work and the scope of compensation. The compensation scope is included within the scope of work.

The scope of work refers to that the Temperature Sensor can be exposed to the medium without any damage. However, this does not mean that the performance can achieve nominal specifications (temperature coefficient) when it is outside the scope of compensation.

Compensation is generally a narrower scope within the scope of work. Within this range, the Temperature Sensor ensures that the nominal specification can be reached. Temperature changes affect the Temperature Sensor in two ways, one is the zero drift, the other is the output of the whole range. Temperature Sensor specification should put these errors listed in the following form: + x % of full scale / ° C, plus or minus x % readings / ° C, plus or minus x % the full scale temperature compensation scope, or + x % for the temperature compensation range readings. If you don't have these parameters, you're not going to make sure that you're using them. So is the change in Temperature Sensor output due to pressure change or temperature change? The temperature effect will be the most complicated part of understanding how to use a Temperature Sensor.

What output is selected?

A: the average Temperature Sensor has a millivolt output, or voltage amplification, or millian, or frequency output. The choice of the output type depends on the selected Temperature Sensor and the distance between the system control or display unit, noise, and other electrical interference, and whether you need to enlarge, best placed the position of the amplifier and so on. For many of the original equipment manufacturers, their control elements and Temperature Sensor are very short distances, so the millivolt output is generally sufficient and low cost.

If Temperature Sensor output is needed, then using another Temperature Sensor with a built-in amplifier is easier. In a long distance cable, or in a large electrical noise area, a milliampere output or frequency output is required. In environments where there is a strong frequency of rf interference and electromagnetic interference, it is necessary to consider additional shielding or this filtration equipment in the presence of milliamps and frequency outputs.


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