The basic principle of thermocouple temperature measurement is that the material conductors of two different compositions form a closed loop. When there is a temperature gradient at both ends, there will be current flowing through the loop. At this time, there is an electromotive force between the two ends - the thermoelectromotive force. This is the so-called Seebeck effect. The homogeneous conductor of two different compositions is a hot electrode, the higher temperature end is the working end, the lower temperature end is the free end, and the free end is usually at a constant temperature. According to the relationship between the thermoelectromotive force and the temperature, the thermocouple index table is prepared; the index table is obtained under the condition that the free end temperature is 0 ° C, and different thermocouples have different index tables.
When a third metal material is connected to the thermocouple loop, as long as the temperature of the two contacts of the material is the same, the thermoelectric potential generated by the thermocouple will remain unchanged, that is, not affected by the third metal access loop. Therefore, when the thermocouple is measuring temperature, the measuring instrument can be connected, and after measuring the thermoelectromotive force, the temperature of the measured medium can be known. When the thermocouple measures the temperature, the temperature of the cold end (the measuring end is the hot end, the end connected to the measuring circuit through the lead wire is called the cold end) is kept constant, and the thermoelectric potential is proportional to the measured temperature. If the temperature of the cold end (environment) changes during the measurement, the accuracy of the measurement will be seriously affected. Some measures are taken at the cold end to compensate for the effect of the cold junction temperature change, which is called the cold junction compensation of the thermocouple. A dedicated compensation wire for connection to the measuring instrument.
Thermocouple calibrator is a high-precision, high-resolution, high-reliability handheld digital calibration instrument. It can display the output and measurement signal values ​​and the corresponding thermocouple type temperature values. It has an LCD backlight and is suitable for use in dimly lit places. Generally, it uses a large-capacity rechargeable battery and can work continuously for more than 24 hours.
The MX813 Thermocouple Calibrator is a high-precision, high-resolution, high-reliability handheld digital calibration instrument that is fully digital and extremely easy to use. The output and measured signal values ​​and the corresponding thermocouple type temperature values ​​can be displayed. It has an LCD backlight for use in dimly lit areas. The meter uses a large-capacity rechargeable battery and can work continuously for more than 24 hours.
Features
Compact, rugged, reliable, easy to carry and handheld
High precision, high resolution, high reliability
8 thermocouples (S, B, R, K, J, N, T, E) measurement and analog output
Thermocouple measurement or analog output, simultaneous display of temperature and electrical signal values
Thermocouple measurement with automatic compensation or manual compensation
Thermocouple output, input temperature corresponding to mV value, or input mV corresponding temperature value, realize fast mutual check of mV value and temperature value
The input of the output value is digital input, which is easy to operate and has Chinese prompts.
Complete port protection
Built-in large-capacity rechargeable battery for long working hours
Large screen LCD with backlit display, Chinese menu operation
Precautions
Never apply a voltage rating greater than the rating indicated on the calibrator between terminals or between terminals and ground. The highest voltage between the terminals is 30 VDC.
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Before using, measure the known voltage to confirm that the calibrator is working properly.
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Please follow the safety procedures for all devices.
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When one end of the test leads is plugged into the current jack, do not touch the other end of the probe against the voltage source.
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Never use a damaged calibrator. Before use, check the calibrator's outer casing for broken or missing plastic components. Pay special attention to whether the joint is insulated.
Select the correct function and range according to the measurement requirements.
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The calibrator is powered by a lithium battery. Please manage the power supply according to the charging and discharging characteristics of the lithium battery to extend the battery life.
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Before use, make sure that the battery is fully charged. If the battery is too low, it should be used after charging.
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Inspect the test leads for damaged or exposed metal. If it is damaged, replace the damaged test lead before use. Check that the test leads are conducting.
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When using the probe, do not touch the metal contacts of the probe with your fingers. The finger should remain behind the finger guard of the probe
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