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N31U User manual
Measuring loops parameters
Additional measurement errors
RS485 interface
Alarm outputs:
• Relay with a switching contact (option): 6 A / 250 V AC; 6 A / 30 V DC;
0.15 A / 250 V DC. Maximum switching current 10 A / 20 ms.
Automatic compensation of reference junction temperature < 1 ºC
Automatic compensation of wire resistance for RTD sensors < 0.5 ºC
Automatic compensation for resistance measurements < 0.2 Ω (range 400 Ω)
< 2 Ω (range 4000 Ω)
Due to ambient temperature changes (main measurement loop and the wires resistance
compensation loops)
50% class / 10 K
Galvanic separation From all other signal connections
Protocol MODBUS RTU
Supported protocol functions 3, 4, 6, 16, 17
Data frame type 8N1, 8N2, 8O1, 8E1
Baud rate [b/s] 2400, 4800, 9600, 14400, 19200, 28800,
38400, 57600, 115200
Current in the sensor circuit during the resistance measurements < 200 μA
Input resistance for voltage measurements: thermocouples, 60 mV, 150 mV, 300 mV,
0...10 V
> 1 MΩ
Input resistance for the current ranges < 11 Ω
Test leads resistance compensation range (maximum resistance of a single lead) < 20 Ω
Terminals temperature automatic compensation range for measurements using the
thermocouple sensors
-30...80 ºC
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