A valve that can be used to modify (regulate) the fluid flow rate in a process control system. It usually includes an actuator, which responds to a signal from the controlling system and changes the position of the flow controlling element in the valve.

A regulator that operates automatically to affect a controlled variable by comparing the value of the controlled variable with the value of a reference variable in order to reduce the difference between them.

An element located in a flowstream using the Coriolis principle to measure the flow.

A mass flow meter that uses the Coriolis principle to measure a mass flow rate through the meter.

A detecting instrument intended to measure, indicate and/or produce a signal which represents the rate or degree of corrosion.

A transmitter that is producing a standardized output signal dependent of a received input signal from a corrosion sensor.

A detecting instrument that counts, especially an electronic or mechanical device that automatically counts occurrences or repetitions of phenomena or events.

A lifting appliance that is a tower or derrick equipped with cables and pulleys that can lift or lower and move loads in multiple directions.

A signal converter that is intended to convert one current signal to another current signal.

A signal converter that is intended to convert an analogue signal (4 - 20 mA) to a proportional linear pneumatic output signal.

A signal converter that is intended to convert a current input signal to a proportional voltage output signal.

An instrument transformer in which the secondary current, in normal conditions of use, is substantially proportional to the primary current and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.

A transmitter that transmits an analogue electrical current.

An analysing instrument intended to determine the density of a substance.

A physical object that is the primary element of a measuring chain which converts the input variable into a signal suitable for measurement.

An analysing instrument intended to determine the dew point of a substance.

A facility for measuring dew point and transmitting a signal representing the measured temperature.

A diaphragm valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

An internal combustion engine in which ignition of the fuel injected into the cylinder is performed by the heat of compression of the air charge.

A flow transmitter providing an output signal that is proportional to the flow inputs from a differential pressure flow meter.

A gauge that is intended for measuring and indicating pressure differences.

A level transmitter that is measuring liquid level by sensing pressure difference between two points, e.g. the hydrostatic pressure at the bottom of a tank to the atmosphere pressure.

A pilot switch intended to switch or give an on/off signal when the measured differential pressure has reached a pre-set value.

A pressure transmitter that is producing a standardized output signal dependent of a received pressure difference signal.

An electric generator for the production of direct current and voltage.