A smaller pump used as a supplemental pump in booster applications. Its purpose is to take over in low consumption periods and thus contribute to lower the energy consumption of the booster as a whole.
Pilot valves are often used in larger refrigeration plants with many consumers. A pilot valve is an add-on to the in-line valve. It enables a small force to operate the larger valve like in a hydraulic piston.
A pressure transducer is fitted in a heating-, cooling-, or ventilation system. It measures the pressure in a specific location in a system and converts it into a signal which can be read by an instrument.
PROFIBUS is a network technology mostly used in process industries but you can find it also in building automation. It is a standardised technology for data communication, managed by Profi International.