AK-LM 350 is a complete monitoring unit with the option of regulation functions via relay switches. The monitoring unit is used to detect temperature, pressure, functions etc. in and around appliance cases and cold rooms for commercial and industrial cooling. COP calculation can be made on the following systems:. CO₂ booster. CO₂ booster with heat recovery. CO₂ booster with heat recovery and brine. Cascade plant. Single stage The monitoring unit is equipped with data communication and is operated via a PC.