National Instruments 785043-01 C Series Temperature Input Module

Part Number 785043-01 is the identifying part number for the National Instruments NI-9210 C Series Temperature Input Module. The 785043-01 features 4 thermocouple channels, an internal autozero channel, and an internal cold-junction compensation channel in its inputs. They are connected to a Delta-sigma ADC having a resolution of 24 bits. The voltage measurement range is ±80 mV while the sampling mode is scanned. It works over the temperature ranges defined by NIST (J, K, T, E, N, B, R, S thermocouple types). The conversion time is 70 ms per channel or 420 ms total for all channels. 

The common mode voltage range for the 785043-01 is ±1.5 V between channel-to-COM whereas for COM-to-earth-ground it is 60 Vrms (with mini-TC) and 250 Vrms (with spring terminal). The input bandwidth for the module is 15 Hz while the noise rejection at 50 Hz and 60 Hz is 85 dB minimum. The 785043-01 comes with an overvoltage protection of ±30 V between any two inputs or between any input and COM. The differential input impedance is 20 MΩ while the input current and input noise are 50 nA and 1 μVrms respectively. 

The measurement accuracy of the 785043-01 depends on the type of the thermocouple and whether the autozero channel is turned on or off. When the autozero channel is on, the measurement sensitivity is as follows: <0.07 °C for types J, K, T, E,and  N, <0.25 °C for type B, and <0.60 °C for types R and S. On the other hand, when the autozero channel is off, the values are as follows: <0.05 °C for types J, K, T, E, and N, <0.20 °C for type B, and <0.45 °C for types R and S.

The 785043-01 consumes a maximum of 200 mW from the chassis while in active mode and a maximum of 10 mW when in sleep mode. The module is recommended for use in between the temperature ranges of -40 °C to 70 °C at a relative humidity of 10% to 90% while it can be stored in between -40 °C to 85 °C at a relative humidity of 5% to 95%.