Capacitive proximity switches can detect objects through certain non-metallic objects. In this proximity switch, two electrodes are used, so when an object reaches the active section of the switch it would be in place of the electrical field of the electrodes and changes the coupling capacitance.

Pressure transmitter is a mechanical device that converts the expansion force of a liquid or gas sample into an electrical output. The device converts the pressure into an electrical signal by means of a transducer. This type of sensor, also known as a pressure transducer, usually consists of a pressure sensitive surface area made of steel, silicon or other materials, depending on the composition of the analyte

Marine pressure transmitter For maritime and industrial application These pressure transmitters are built around a dry, robust measurement capsule made of ceramic, with an internal strain gauge Wheatstone-bridge as a converting element between the pressure and the electrical signal.

A Pressure Transmitter is an instrument connected to a Pressure Transducer. The output of a Pressure Transmitter is an analog electrical voltage or a current signal representing 0 to 100% of the pressure range sensed by the transducer.

Electronic hooter/siren: For alerting the public these are accumulated of electronic circuits (oscillators, modulators, and amplifiers). These are linked to the external speakers which ultimately produce a selected tone of sound for different emergencies.