8-Channel Temperature Measurement Device In An M2 Enclosure

3rd June 2013

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Datasheet

IPETRONIK upgrades the second generation of its M-Series CAN modules by adding M-THERMO2, an 8-channel temperature measurement device connectable to K-Type Thermocouples (NiCr/NiAl). The redesigned M2-Series enclosure uses reduced dimensions of 106 mm x 30 mm x 50 mm (W x H x D) and is designed for use in the engine compartment supporting IP67 protection class, as well as the extended temperature range of -40 °C to +125 °C. A supply voltage in the range of 9 VDC to 36 VDC is required. Typical power consumption is 1.1 W.

The temperature measurement range of -60 °C to +1370 °C is digitalized by a 24-bit analog-to-digital converter. Cold junction compensation is accomplished using a PT100 temperature sensor directly at each measurement input socket.

A compensation of the AD converter is performed each time before a measurement value is acquired. To achieve the highest possible accuracy, the sensor characteristic is linearized using an internal compensation algorithm.

The hardware filter used in IPETRONIK’s M-THERMO2 is a single pol low-pass RC filter with a cut-off frequency of 1 Hz. The resolution is ≤0.087 °C (≥14 bits). Accuracy is specified as ±0.035 % of the temperature measurement range at 25 °C.

The measurement module features channel sampling rates up to 100 Hz and a maximum aggregate sampling rate of 800 Hz. Status LEDs at each measurement input indicate open inputs (sensor break detection) and provide information on the channel location during software configuration. The output data is transmitted using CAN bus 2.0B according to ISO 11898-2 with up to 1 MBit/s.

All measurement inputs, CAN bus and power supply are completely galvanically isolated from each other. As known from the former M-Family, M-THERMO2 provides a toolless mounting technique to attach the modules to each other.