An intelligent pressure monitor for stationary refrigeration technology. The products of the SMART PRESSURE GATE 501 line replace conventional components in the refrigeration circuit, thus reducing not only the risk of leaks but also installation time. Furthermore, with SMART PRESSURE GATE 501 versions for natural refrigerants, you can comply with the ever-growing requirement for energy-conserving refrigerants for reducing greenhouse gas emissions. The product concept is perfected by an integrated EC condensing-fan speed controller for increasing the energy efficiency of the refrigeration system.