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Temperature of the temperature sensor selection considerations

1, the temperature of the measured object is to record temperature sensor, temperature alarm and automatic control, whether you need to distance measurement and transmission;

2, the size of the temperature measurement range and accuracy;

3, the propriety of temperature measuring element size;

4, in the occasion of measured object temperature change over time, the lagging of the temperature measuring device can meet the requirements for temperature measurement;

5, the object to be tested environment conditions on the temperature measuring components for damage;

6 prices, such as insurance, will it be convenient for use.

the temperature of the temperature sensor installation using the

the error of thermal inertia is introduced into because of thermocouple thermal inertia instrument indicated value behind the change of the measured temperature, temperature (temperature sensor Figure 12) This effect is particularly prominent in the fast measurement. So should be used as thermal electrode is small, small thermocouple protection tube diameter. Temperature measuring environmental permits, even protecting tube can be taken. Due to measurement lag, using thermocouples detect temperature fluctuations of the amplitude of the furnace temperature fluctuation amplitude of the small. Measurement lags behind, the greater the fluctuation amplitude of the thermocouple is smaller, and the actual temperature difference. When using the time constant of thermocouple temperature or temperature control, instrument display temperature fluctuation is small, but the actual furnace temperature fluctuations can be quite large. In order to accurately measure temperature, should choose small thermocouple time constant. With thermocouple time constant is inversely proportional to the heat transfer coefficient, heat the density and specific heat is proportional to the diameter, material, such as to reduce the time constant, in addition to the increased heat transfer coefficient, the effective way is to try to decrease the size of the hot end. Use, usually USES the material with good thermal conductivity, thin, small diameter of the tube wall to protect casing. In the precision of temperature measurement, using unprotected casing bare wire thermocouple, thermocouple easy damaged, should be timely correction and replacement.

temperature temperature sensor is easy to overlook the details two

the principle of temperature sensor and temperature installation has said a lot, most people already know, but in the process of temperature temperature sensor using two details easy to ignore. One is its working temperature, and the other is its insertion depth.

the normal work of temperature temperature sensor element is to meet its working conditions, one of which is its working current, because of the temperature sensor with temperature resistance, when current flows through the temperature temperature sensor element, there will be a power loss, fever, so in order to reduce fever, temperature measurement error caused by temperature sensor itself so under the condition of meet the normal work of the temperature sensor, try to reduce the fever itself. This is why temperature sensor to be in a constant temperature under the condition of low current use. So such as platinum thermal resistance of the conventional working current is 5 ma, ma, but we recommend working current is 1. The reason is to reduce the temperature measurement error caused by the temperature sensor element self-heating. Current is constant, the output will has a linear relationship of temperature and electric potential.

temperature inserted depth of the temperature sensor is also easy to overlook a problem, there is a diameter is larger, it is not reasonable, especially in the case of high temperature it is not desirable, in theory, temperature temperature sensor insertion depth can generally be decided according to the actual needs. But * insert depth should not be less than the temperature, the temperature sensor less protection 8 - the diameter of the casing 10 times. In this way can guarantee the stability of temperature temperature sensor performance.

to know the temperature of the temperature sensor working current and insertion depth to our selected and use temperature, temperature sensor, it is very necessary. Ignore this two details are easy to cause temperature temperature sensor performance is not stable and even damaged.

the maintenance of the temperature sensor temperature

1. Temperature around the temperature sensor should try to set some 'damper', even the temperature sensor with thin metal plate covered up. Can help to prevent sundry defiled temperature sensor and some moving parts, and this kind of 'contamination' tends to make the movable part of the movement, and affect the weighing accuracy.

2. To should take put down gently especially made by aluminum alloy elastomer small capacity of temperature sensor, any impact, drop, the performance measurement may cause great damage. The temperature of the temperature sensor for large capacity, in general, it has a larger weight, so requirements during transportation, installation, use appropriate lifting equipment (as far as possible Such as hand chain hoist, electric hoist, etc. ) 。 Installation temperature sensor is the base of the face should level off, clean, no oil film, film, etc. Install base itself should have sufficient strength and rigidity, general requirement is higher than the strength and stiffness of temperature sensor itself.