Tianjin integrated temperature thermal resistance temperature sensor manufacturer provides straightly

Temperature temperature sensor fault analysis and treatment method of

temperature caused by temperature sensor failure

this is a common and good judgment of fault. In use process, once appear abnormal temperature temperature sensor output, first check whether temperature temperature sensor failure. In the temperature under the condition of normal temperature sensor circuit, there are several ways.

（ 1) The temperature of the temperature sensor circuit. Temperature temperature sensor has the temperature fuse alarm function, at this time regardless of the temperature sensor front end is the thermal resistance and thermocouple, will show the temperature sensor output value is less than standard signal that is less than 4 ma. The current standard fuse alarm current is 3. 75 ma, when the temperature of the test temperature sensor output, the multimeter display the current value of 3. 75 ma, at the same time, the temperature sensor module in the red light flashing, can determine the temperature of the temperature sensor circuit, replace the front-end probe can be solved.

some customers because of the upper instrument difference, have special request for current fuse alarm, factory can be customized, such as requiring fuse alarm current is less than 3 ma, in the case of guarantee accuracy can do 2. 95 ma, is even lower.

（ 2) Short circuit temperature temperature sensor. The temperature temperature sensor output value generally no law, is an outlier, can be understand as 'noise' in the software. In fact because of short circuit temperature temperature sensor, after a constant current source excitation into the MCU voltage could be a abnormal voltage value, then after a series of AD conversion, amplification, DA conversion, the output is an abnormal value. Well if the front-end circuit processing, temperature temperature sensor module will not damage, dealing with bad circuit module will be damaged.

（ 3) Temperature temperature sensor 'empty empty short'. This kind of situation usually temperature and normal temperature sensor, sometimes is not normal. Most the reason of temperature temperature sensor encapsulation quality problem, replacement of the probe can be solved.

the temperature of the temperature sensor calibration method

calibration is mainly the use of special calibration instruments, temperature temperature sensor connection, check on the spot. Zero when in school, through the calibration instrument input 0 ℃ and larger values ( Such as 1300 ℃) To see whether the temperature display is consistent with the standards of a given degree, through the zero on the temperature sensor module, tuning knob to full accordance with the given numerical. Central control room for the integration of the thermocouple, because in addition to show the transformation temperature, we can't see the value in the spot, so another check method. Mainly used in the instrument with 24 v dc switching regulated power supply, multimeter, special calibration instrument and a integration of thermocouple.

the temperature of the temperature sensor technology performance index

temperature temperature sensor is a kind of converting temperature variables can transmit the standardization of the output signal of the instrument. It is mainly used for industrial process measurement and control of the temperature parameters. It adopts thermocouple, heat resistance as temperature measuring element, from the output signal of temperature measuring element to the temperature sensor module, after filtering, arithmetic amplifier, nonlinear correction, V/I conversion, constant current and reverse protection circuit processing, convert and a linear relationship with temperature of 4 ~ 20 ma current signal output. The relevant technical indicators are as follows:

input range: - 60 ℃ ~ 175 ℃

accuracy level: 0 or less. 5%. F。 S

the machine power consumption: 0 or less. 5 va

insulation resistance: p 20 m Ω ( DC500V)

response time: 350 ms or less

working environment: - 10 ℃ to 50 ℃, 20% ~ 90% without any condensation

storage environment: - 40 ℃ ~ 70 ℃, 20% ~ 95% without any condensation