11 - 6
IM 4H3B1-01E
Temperature Measurement Using RTD for the Pen Model
Figure 11.4 Temperature Measurement Using RTD (Pen Model)
Temperature Measurement Using RTD for the Dot Model
Figure 11.5 Temperature Measurement Using RTD (Dot Model)
Temperature Measurement Using TC
Reference Junction Compensation for Thermocouple Input
As the temperature at the measurement terminal of the recorder is generally equal to the room
temperature, a voltage is applied to the inside circuit to obtain the equivalent of 0
°
C. Therefore when
the measurement terminals are shorted (equivalent to 0
°
C at detector tip in the reference table) the
room temperature (equals the temperature at the measurement terminal) is displayed. As a result,
the recorder is measuring the temperature of the input terminal and compensates this value. When
calibrating the recorder, the input voltage without subtracting the compensation voltage should be
applied (For example, use the YOKOGAWA Model T-MJ reference Junction compensator shown
above).
Figure 11.6 Temperature Measurement Using TC
DC Voltage Standard
Copper wires
Thermocouple wires or
compensation wires
(Reference Junction Compensator
YOKOGAWA Model T-MJ)
+
+
Meter
Couple
–
+
–
0
°
C
•
Thermocouple wires
Copper wires
Input terminals
(DC V & TC inputs)
–
+
Power Supply terminal
(for others than /P1 model)
L
N
1
2
3
4
Input terminals
(DC V & TC inputs)
B
–
L
N
1
2
3
4
Decade Resistance Box
(YOKOGAWA Model 2793-01)
Power supply terminal
(for others than /P1 model)
b A
Input terminals
(RTD inputs)
L
N
1
2
3
4
5
6
Power supply terminal
(for others than /P1 model)
b B A
Decade Resistance Box
(YOKOGAWA Model 2793-01)
