Appendix
App-3
IM 2553A-01EN
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App
Index
When Using an External Reference Junction Compensation
Wiring Example
When Connecting an RJ Sensor Directly to the Device to Be Calibrated
Thermometer, data
logger, and the like that
support thermocouple
input
2553A
Copper wires
Connect the measurement
section of the RJ sensor to the
input terminal of the device to
be calibrated.
When Connecting an RJ Sensor to a Relay Terminal Block
Thermometer, data
logger, and the like that
support thermocouple
input
2553A
Copper
wires
Connect the measurement
section of the RJ sensor to the
relay terminal block.
Thermocouple wires
or
compensating lead
wire
Off-the-shelf relay terminal block
If the measurement section of an RJ sensor is connected to the input terminals of the device to
be calibrated and the temperature of the terminals is different from the ambient temperature, the
temperature imbalance will cause the temperature of the terminals to change. This may prevent
accurate reference junction compensation. In such a situation, use a relay terminal block that is
at the same temperature as the ambient temperature. However, you will need a thermocouple or
compensating lead wire.
Configuring the 2553A
1.
Connect an external reference junction (RJ) sensor to the external RJ sensor input terminal on
the rear panel.
• For the wiring details, see section 3.6.
• The measurement section of the external RJ sensor is connected to the input terminal or the relay
terminal block of the device to be calibrated.
2.
Set the reference junction compensation mode to AUTO.
• For details on the configuration procedure, see section 6.5.
3.
Set the thermocouple type, temperature, and the like, and calibrate.
• For details on the configuration procedure, see sections 6.1 to 6.3.
• Reference junction compensation error is added to the thermocouple temperature source accuracy.
Appendix 2 Thermocouple Calibration Wiring Examples
