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IM 4H3B1-01E
7.7 How to Set the Remote RJC (For /N5 Model)
When measuring a temperature by thermocouple (TC) and the object of measurement is
located at a big distance, it is possible to measure the temperature without using a lot of
expensive TC wires by establishing a relay terminal near the measurement object.
The relay terminal and object of measurement are connected by TC. The relay terminal
and input terminal of the main unit are connected by a compensating copper wire.
One other input terminal of the main unit is connected with the relay terminal by TC
and by couducting standard setting compensation of the to be measured temperature,
which is done by measuring the temperature of the relay terminal, the temperature of the
measurement object can be calculated. (Refer to the figure below.)
NOTES
The input mode of the reference channel should be same as the used TC.
The range of each measuring channel will become same as the range of the reference
channel.
The limits of the span of the measuring channel are the same as for the usual TC input
(refer to page 7-4).
Scaling is not possible.
In case you change the range or input mode of the reference channel, the input mode of
the measurement channel being TC will not change, while the span becomes the upper/
lower value of the newly set range.
main unit
relay terminal (to be prepared by customer)
TC*
compensating
copper wire
compensating
coppwer wire
* Please use the same type of TC
TC*
reference channel
measurement channels
TC*
input terminal
A
B
B
B
B
