mV, THC or RTD input

The SB3075 converts a low-level dc signal from a temperature sensor mounted in the field into two 4/20mA current signals for driving a control-station load. Software-selectable features include configuration, ranging, monitoring and testing for eight thermocouple types, or two kinds of 3-wire RTDs. Each thermocouple model converter has an integral sensor for the purpose of cold-junction compensation. Configuration is carried out through a port inside of the module using and a personal computer. The SB3075 provides dual outputs.

Dimension

114.5mm×99.0mm×17.5mm

Number of channels
1   with dual outputs

Signal source
Millivolt Types J, K, T, E, R, S, B or N THCs to IEC584 3-wire PT100 or Cu50 RTDs to BS1904/DIN 43760

Input signal range
-75 to +75mV, or 0 to 450Ω

Input signal span
3 to 150mV, or 10 to 450Ω

Cold junction compensation
Automatic Error: ±1.0℃

Common mode rejection
120dB for 250V at 50Hz/60Hz

Series mode rejection
40dB for 50Hz/60Hz

Calibration accuracy (at 20℃)
(Includes hysteresis, non-linearity and repeatability) Inputs: mV/THC: ±15μV or±0.05% of input value (whichever is greater) RTD: ±80mΩ Output: ±11μA

Temperature drifts (typical)
Inputs: mV/THC: ±0.003% of input value/℃ RTD: ±7mΩ/℃ Output: ±1.0μA/℃

Output range
4 to 20mA or 1 to 5V Note: Clear indication should be given in ordering code when 1 to 5V is needed.

Control-station side circuit load resistance
0 to 550Ω

LED indicators
One provided for power indication

Power supply
Voltage: (20~35)VDC Current: (with 20mA signal) 44mA at 20V 40mA at 24V 32mA at 35V Power: 1W typical at 24V with 20mA signal

Isolation
250V AC/DC between control station and filed circuits