英語 での Cold junction の使用例とその 日本語 への翻訳
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Programming
Internal cold junction for TC.
The temperature-sensing IC is located near the thermocouple connector cold junction.
The RTD is used for cold junction compensation.
For cold junction of various kinds of thermocouples for precision temperature measuring and control.
This contact point is called the cold junction see Figure 2.
The cold junctions are formed at the connector contacts, and the CJC RTDs are located close to the connectors.
The top of the thermopile cold junction, the following is the hot end.
The cold junctions are formed at the connector contacts, and the CJC RTDs are located close to the connectors.
The 4-wire RTD used for the cold junction requires its own linearization.
This method is based on the assumption that the temperature at theIC is approximately the same as the temperature at the cold junction.
Then the temperature measured at the cold junction is added to the value indicated by the measurement of the thermocouple voltage.
Instead of using an external RTD,the ADT7311 temperature sensor can be used to measure the cold junction temperature.
Since the"cold junction" is located inside the oven, a second thermocouple provides a static reference to the internal temperature.
The software then sums the total thermocouple voltage(VTC-VCJ) with the cold junction VCJ to obtain the thermocouple EMF, VTC.
A temperature-sensing IC, located in close proximity to the thermocouple connector,measures the temperature in the vicinity of the cold junction.
The solutions bias the sensors, handle the cold junction compensation needed for thermocouples, have many built-in fault detections, and provide digital outputs.
As an extra option, the ADT7311 digital temperaturesensor can be used to measure the cold junction temperature instead of the RTD.
Selecting a Device for Cold-Junction Temperature Measurement As explained above, to implement cold-junction compensation,the temperature of the cold junction must be determined.
Data acquisition system for the automation of data collection rate should be at least 10Hz,and provide cold junction compensation for thermocouple measurements.
Cold junction compensation was tested by connecting a Type J thermocouple to a channel and maintaining the thermocouple at ambient temperature while cycling the CN-0394 board under a ThermoStream or Thermonics temperature controller.
The temperature at the measuring junction can be measured only if the temperature of theother junction(often called the reference junction or the cold junction) is known.
Cold Junction Compensation in Thermocouple- Maxim If the two different metals are joined(i.e., welded or soldered) to form two junctions, as in Figure 1a, the voltage generated by the loop is a function of the temperature difference between the two junctions. .
The simulator then uses the ITS-90 tables and equations to convert the thermocouple temperature,TTC, and the cold junction temperature, TCJ, into their respective voltages, VTC and VCJ.