Thermocouple sensor main characteristic parameters and connection

1. Thermocouple sensor main characteristic parameters of the

1, zero output: in the current or voltage to be measured under the condition of zero, the output signal of thermocouple sensor for zero output.

2, rated output: thermocouple sensor under the condition of the measured signal for rating, thermocouple sensor output signal and the output value of the zero sequence for the difference between the rated output.

3, linearity: the actual characteristics of linearity is measured by thermocouple sensor conforms to the extent of the straight line, due to the actual features is usually a curve, it has a deviation and theoretical characteristics, the size of the deviation of the extent to which reflects the actual characteristics of nonlinear, it can be said with the non-linear error measuring system linearity.

4, accuracy, precision of the thermocouple sensor when the thermocouple sensor within its range, its basic error and rated output value is expressed as a percentage of the thermocouple sensor.

5, measuring range: thermocouple sensor measurement range refers to the thermocouple sensor can measure the maximum current value or voltage value, measuring range is generally higher than that of rating of more than two times.

6, zero temperature drift: thermocouple sensor ambient temperature changes every 1 ℃, the change of the zero output value and the ratio of the rated output value, generally less than 0. 025%.

2. The connecting way of thermocouple sensor

1, straight type ( Open loop) Connection

1) Direct current thermocouple sensor CS series. Its output signal for voltage form, under the rated working conditions, the standard output signal of plus or minus 4 v. If users have special requirements, can produce different rated output of thermocouple sensor to the manufacturer. Thermocouple sensor on the zero and gain adjustment potentiometer, users do not need to be adjusted again.

　　2) More direct put current thermocouple sensor for the four terminals, respectively, are power input '1' side, negative power input '2', '3' end for the signal output end, '4' for the power supply.

2, magnetic balance type ( The closed loop) Connection

1) Magnetic balanced current, its output signal voltage thermocouple sensor for the current. ( If you need voltage output mode, can be in M side and power supply according to the voltage required size between external sampling resistor or sampling voltage signal amplification of necessary. )

　　2) Magnetic balanced current, voltage thermocouple sensor is three more terminals, respectively is: 'end' is the power input, negative power input by '- 'End,' M 'for the signal output end of the

3, the voltage of the thermocouple sensor wiring 1) Voltage thermocouple sensor, generally there are 5 terminals, including 'V', 'V - 'As the primary side terminals, respectively the measured voltage at the input of the positive and negative. Another three terminals as terminal side, 'end' is the power input, negative power input by '- 'End,' M 'for the signal output terminal.

　　2) According to the measured voltage is different, the user should be on the way and the original edge back concatenated current-limiting resistance R. To make the best accuracy thermocouple sensor, try to choose the size of the R make the input current of 10 ma, left and right sides.

　　3) Considering the primary coil resistance ( Compared with Ri, to keep the temperature as low as possible) And isolation. In order to ensure the stability of measuring the resistance, Ri of power for over 4 times of the rated power ( In more than 10 w) 。

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