An instrument is a device that measures a physical quantity such as flow, temperature, level, distance, angle or pressure. Instruments may be as simple as direct reading thermometers or may be complex multi-variable process analysers. Instruments are often part of a control system in refineries, factories and vehicles.  The control of processes is one of the main branches of applied instrumentation.

Instruments attached to control systems may provide signals used to operate solenoids, valves, regulators, circuit breakers or relays. These devices control a desired output variable and provide either remote or automated control capabilities. These are often referred to as final control elements when controlled remotely or by a control system.

A transmitter is a device that produces an output signal, often in the form of a 4-20 mA electrical current signal, although many other options using voltage, frequency, pressure or ethernet are possible. This signal can be used for informational purposes, or it can be sent to a PLC, DCS and ICSS system.

Control instrumentation plays a significant role in both gathering information from the field and changing the field parameters and as such are a key part of control loops. IMR Electrical can assist with a range of instrumentation service including design, supply, installation and calibration.