Parameters LIMIT and HYSTERESIS are used to switch the relay based on concentration or temperature measurement values by the functions CONC - HIGH LIMIT, CONC - LOW LIMIT, T - HIGH LIMIT and T - LOW LIMIT. The relay closes on high limit when the measured value exceeds HIGH LIMIT + HYSTERESIS. The relay opens on high limit when the measured value goes below HIGH LIMIT - HYSTERESIS. Alternatively, the relay closes on low limit when the measured value goes below LOW LIMIT - HYSTERESIS. The relay opens on low limit when the measured value exceeds LOW LIMIT + HYSTERESIS.
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Select the function.
You get access to the relay parameters that apply to this function.
Even though the relays can be configured independently, it is recommended that, for example, if you set precondition and wash parameters for a certain refractometer, you set them in the same relay module card. 
