Two separate relays enable dual stage control (for heating and cooling) with temperature control using two control set points on the basis of the value read by the cell probe. A special set of parameters can be used to set the temperature not only on the basis of the operating set point but also in the following ways:

“differential” control meaning control of the “difference” between the values read by the two probes.

“offset set point” control meaning control of the set point + a preset “offset” determined by the value read by the second probe. The “actual” set point calculated in this way will be the new control value. Control using the actual set point can be limited using two special parameters.