The CAI 888 Temperature Sensing Module

Three different thermal elements can be connected to the module, which are switchable through the software. For a type J with iron/copper-nickel, temperature sensors for measurement ranges from 0 to 33.1 mV at 0 to 600 °C, type K with nickel-chrome/nickel sensors, for 0 to 33.3 mV at 0 to 800 °C and finally type L with iron-copper/nickel sensors for 0 to 33.7 mV at 0 to 600 °C. On the CAI 888 itself is an external compensation measuring point.

In addition to the 8 thermal elements, 8 digital voltage outputs are available. Solid state relays can be connected directly to these outputs for control of the heater. In addition, a possible low voltage in the supply is shown using two LEDs.