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M800W/M80W Series Connection and Setup Manual
4 General Specifications
(a-5) Supplement: Overall precision of temperature measurement
The precision shown in (a-3) and (a-4) is the one attributed to the unit. The thermocouple or resistance
temperature detector input to the unit also has precision and the overall precision of temperature
measurement is the addition of the precision of unit and the precision of thermocouple or resistance
temperature detector.
The precision of unit includes the cold junction compensation precision (± 1°C).
<Calculation example of thermocouple overall precision>
Thermocouple overall precision = Unit precision + thermocouple precision
When K-type or Class2 thermocouple is used, if the measurement point temperature is 100°C, the
overall precision is as below.
(Note)
<Calculation example of resistance temperature detector overall precision>
Resistance temperature detector overall precision = Unit precision + Resistance temperature
detector
When Pt100 or ClassA resistance temperature detector is used, if measurement point temperature
is 100°C, the overall precision is as below.
(Note)
According to the thermocouple standard (IEC60584-1), K-type or Class2 thermocouple
precision is
"± 2.5 ° C or 0.75% of the measurement temperature, whichever has the greater value"
(Overall precision) = ± 3 [°C] ± 2.5 [°C]
= ± 5.5 [°C]
According to the Platinum RTD standard (IEC60751), Pt100 or ClassA precision is
"± (0.15 + 0.002 |t| ) [°C] t: Measurement temperature"
(Overall precision) = ± 1. 5 [°C] ± (0.15 + 0.002 × 100) [°C]
= ± 1.85 [°C]
157
IB-1501268-K
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