4.1.3
Resistance measurement
Range Resolution Accuracy
Notes
400 Ω
1 m Ω
0.012 % of rdg.
+ 10 m Ω
Measurement current = 0.25 mA
4000 Ω
10 m Ω
0.012 % of rdg.
+ 100 m Ω
Measurement current = 0.25 mA
Temperature coefficient < 5 ppm/°C from 0 °C to 18 °C and from 28 °C to 50 °C.
•
Automatic detection of connection scheme: 2 wire, 3 wire or 4 wire.
•
For 2 wire connection, the measurement includes the resistance of the line.
•
For 3 wire connection, add the out-of-balance of the line resistances.
•
Open circuit terminal voltage < 10V.
•
Continuity test:
- Open circuit for
R > 1000 Ω
.
- Closed circuit for
R < 1000 Ω
.
4.1.4
Temperature measurement (Thermocouples)
Sensor type:
•
Standardized to IEC 584-1/1995 (thermocouples K, T, J, E, S, B, N).
•
According to DIN 43710 (thermocouples U and L).
•
According to tables of HOSKINS (thermocouple C) .
•
According to table of ENGELHARD (thermocouple platinum)
Sensor
Range of measurement Resolution Accuracy
K
-250 up to -200 °C
-200 up to -120 °C
-120 up to 0 °C
0 up to 1372 °C
0.2 °C
0.1 °C
0.05 °C
0.05 °C
0.80 °C
0.25 °C
0.1 °C
0.013 % of rdg. + 0.08 °C
T
-250 up to -200 °C
-200 up to -120 °C
-120 up to -50 °C
-50 up to 400 °C
0.2 °C
0.05 °C
0.05 °C
0.05 °C
0.70 °C
0.25 °C
0.10 °C
0.013 % of rdg. + 0.08 °C
J
-210 up to -120 °C
-120 up to -0 °C
0 up to 1200 °C
0.05 °C
0.05 °C
0.05 °C
0.25 °C
0.09 °C
0.013 % of rdg. + 0.07 °C
E
-250 up to -200 °C
-200 up to -100 °C
-100 up to 0 °C
0 up to 1000 °C
0.1 °C
0.05 °C
0.05 °C
0.05 °C
0.45 °C
0.15 °C
0.07 °C
0.013 % of rdg. + 0.05 °C
R
-50 up to 150 °C
150 up to 550 °C
550 up to 1768 °C
0.5 °C
0.2 °C
0.1 °C
0.8 °C
0.013 % of rdg. + 0.35 °C
0.013 % of rdg. + 0.2 °C
S
-50 up to 150 °C
150 up to 550 °C
550 up to 1768 °C
0.5 °C
0.2 °C
0.1 °C
0.80 °C
0.013 % of rdg. + 0.35 °C
0.013 % of rdg. + 0.25 °C
B
400 up to 900 °C
900 up to 1820 °C
0.2 °C
0.1 °C
0.013 % of rdg. + 0.4 °C
0.013 % of rdg. + 0.2 °C
U
-200 up to 660 °C
0.05 °C
0.15 °C
L
-200 up to 900 °C
0.05 °C
0.2 °C
