Chapter 2 SPECIFICATIONS
2 - 6
2.4.3 Accuracy
The accuracy of the thermocouple input module is within ±0.3 % of all of the measuring tempera-
ture range and error (±1°C) from reference junction compensation is added.
Example) When a thermocouple type K is used, the detected temperature values to temperatures
–200°C, 500°C and 1200°C are as below.
• Overall measuring temperature range of the K type: 1400°C (-200.0°C to 1200.0°C)
• Accuracy of the K type: 1400°C
×
±0.003 = ±4.2°C
• Accuracy including the error of reference junction compensation : 4.2 ± 1 = ±5.2°C
• Temperature conversion range : - 205.2 °C to – 194.8 °C when –200°C
494.8°C to 505.2°C when 500°C
1294.8°C to 1205.2°C when 1200°C
2.4.4 Burn-out Detection
This function detects disconnection of the thermocouple or compensating wire connected to the
thermocouple input module. As shown in the Fig. 2.2, if disconnection occurs in the thermocouple
or compensating wire the internal disconnection detection circuit measures an out-of-range voltage
and occurs disconnection error codes. Disconnection detection function is automatically performed
on every channel.
[Fig. 2.2] Disconnection Detection Area
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