Transmitter

How it is used

Used by instrument technicians, operators and control engineers. Transmitters are calibrated, zeroed, ranged, replaced and checked when a reading looks wrong. On P&IDs they appear with tags such as PT (pressure), TT (temperature), LT (level) and FT (flow).

Example sentences

1. The level transmitter is reading 0%, but the sight glass shows the tank half full.

2. Ask the instrument tech to calibrate the pressure transmitter on the discharge line.

Common collocations

• pressure transmitter
• level transmitter
• calibrate a transmitter
• transmitter failure

Related terms

• control loopA set of parts that work together to hold one process variable at its setpoint: a sensor and transmitter, a controller and a final element such as a control valve.
• flowmeterAn instrument that measures the flow rate of a liquid or gas in a pipe. Common types are orifice plate, magnetic, Coriolis, vortex and ultrasonic meters.
• P&IDShort for piping and instrumentation diagram: a detailed drawing of every pipe, valve, instrument, control loop and safety device in a unit.
• DCSShort for distributed control system: the computer-based system that runs the control loops of a plant and gives operators their screens, alarms and trends in the control room.

More terms: Process Control and Instrumentation

• setpoint
• control valve
• feedback control
• PID controller