Orbit Merret OMX 103UNI, User Manual

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86 | USER MANUAL OMX 103UNI
7. REFERENCE JUNCTION
8. 1 Connecting a thermocouple
When the signal convertor is set to measure temperature using a thermocouple, it offers two different ways
of reference junctions' temperature measurement.
■
With reference thermocouple
• reference thermocouple may be placed in the same location as the signal convertor or at a place with a stable
temperature / in a compensation box
• when using a fererence thermocouple, set
CO.1
in the device's menu to
IN.2
or to
EX.2
• when using a thermostat (a compensation box or a place with a stable temperature), enter into the menu
item
C.J.1
its temperature (applicable to setting
CO.1
in
EX.2
)
• if the reference thermocouple is in the same environment as the signal convertor, set
CO.1
to
IN.2
. When
using this method, the measurement of of ambinet temperature is done by the means of a sensor that is
located in the convertor's terminal block.
■
Without reference thermocouple
• inaccuracy caused by the formation of different thermocouples at the terminal / wire junction of the
thermocouple is not compensated
• when using this method, set
CO.1
in the device menu to
IN.1
or to
EX.1
• when a reference thermocouple is not used, the innacuracy can reach up to 10°C
(applicable to setting
CO.1
in
EX.1
)
J
+
V
J
2
Referenční termočlánek
Měřicí termočlánek
+
+ -
- -
OM xxx T/C
1