2 SPECIFICATIONS
2.5 Accuracy
21
2
Accuracy at thermocouple connection
The accuracy (
) is given by the following formula:
Full scale
×
Thermocouple ac Cold junction compensation accuracy
Ex.
Accuracy when B thermocouple is used, the operating ambient temperature is 25
, and measured temperature is 1000
(1700
- 600
)
×
(
±
0.0013) + (
±
1
) =
±
2.5
■
Usable thermocouples and conversion accuracy
Usable thermocouples and conversion accuracy are shown as follows.
To stabilize the accuracy, warm-up (supply power) the system for 30 minutes or more after power-on.
Accuracy at resistance temperature detector connection
The accuracy (
) is given by the following formula:
Conversion ac Temperature characteristic
×
Operating ambient temperature Allowable tolerance of used
resistance temperature detector
■
Usable resistance temperature detector, accuracy
Usable thermocouple
Conversion accuracy
(at operating ambient temperature 25
±
5
)
Conversion accuracy
(at operating ambient temperature -20 to +55
)
K
±
1.5
±
7.3
J
±
1.2
±
4.95
T
±
1.5
±
6.5
B
±
2.3
±
9.8
R
±
2.5
±
12.5
S
±
2.5
±
12.5
Usable resistance
temperature detector
Temperature measuring
range
Accuracy (accuracy for the maximum value of the selected range)
at operating ambient temperature
25
±
5
at operating ambient temperature -20
to +55
Pt100
-200 to +850
±
0.8
±
2.4
Ni100
-60 to +250
±
0.4
±
1.2
Содержание MELSEC iQ-F
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