13-3
IM 2553A-01EN
Troubleshooting, Maintenance, and Inspection
3
2
1
4
5
6
7
8
9
10
11
12
13
14
App
Index
Reference Junction Compensation
Of the RJC, EXT, and INT indicators, the one that was on is blinking.
Cause
The temperature type was set to TC USER or RTD USER when user-defined thermocouple or
RTD is not available. (This excludes the case when the reference junction compensation mode
is set to manual input (MAN) and the correction value is set to 0.00°C.)
For example, this will occur if the user definitions of thermocouple output have been deleted with
a communication command.
Correction
Set the temperature type to a type other than TC USER or RTD USER, or create user definitions.
Cause
The reference junction temperature setting when the reference junction compensation mode
is set to manual input (MAN) or the measured reference junction temperature went outside the
range defined by the selected thermocouple type. (This excludes the case when the reference
junction compensation mode is set to manual input (MAN) and the correction value is set to
0.00°C.)
For example, this will occur if the thermocouple type is B and the reference junction temperature
is –20°C.
* Even if it goes outside the defined range, the 2553A will expand the definition up to the
reference junction temperature setting or the measured reference junction temperature and
output thermoelectromotive force after applying reference junction compensation.
Correction
Set the reference junction temperature within the defined range.
Cause
The reference junction temperature setting when the reference junction compensation mode
is set to manual input (MAN) or the measured reference junction temperature went outside the
range defined by the user definition.
For example, this will occur if the reference junction temperature is set to –20.0 °C when the
source range is ±10.0°C in the user definition.
* Even if it goes outside the defined range, the 2553A will assume the reference
junction temperature to be 0.00°C (no reference junction compensation) and output
thermoelectromotive force after applying reference junction compensation.
Correction
Set the reference junction temperature within the user-defined range, or set the user definition
that includes the reference junction temperature.
The reference junction compensation setting (polarity, setting, and unit) displays are blinking, and the RJC indicator
is also blinking.
Cause
The reference junction temperature setting was set outside the range (–20°C to +60°C) when
the reference junction compensation mode is manual input (MAN).
For example, this will occur if you change the setting from +60°C to –60°C by changing the
polarity.
Correction
Operate an output setting dial. The setting will change to the maximum setting in the appropriate
polarity or within the selectable range.
The RJC indicator is blinking, and the reference junction temperature display is showing –199.99 or +199.99.
Cause
The measured reference junction temperature went outside the range (–20°C to +60°C).
If the measured temperature is less than –20°C, the reference junction temperature display
shows –199.99. If the measured temperature is greater than +60°C, the reference junction
temperature display shows +199.99.
13.2 Error Indication
