Controls & Instrumentation
BTU Meter
A BTU Meter (British Thermal Unit meter) measures thermal energy transferred by a fluid loop by combining flow…
Controls & Instrumentation
Control Loop Tuning
Control Loop Tuning is the process of adjusting a PID loop's proportional, integral and derivative parameters so the…
Controls & Instrumentation
Control Panel
A Control Panel is an enclosure housing the controllers, relays, terminals, power supplies and wiring that operate a…
Controls & Instrumentation
Control Philosophy
A Control Philosophy is a document describing, in narrative form, how a system is intended to operate, including…
Controls & Instrumentation
Damper Actuator
A Damper Actuator is a motor-driven device that opens, closes or modulates a damper in response to a…
Controls & Instrumentation
DDC Controller
A DDC Controller (Direct Digital Control) is a microprocessor-based device that executes control logic in software, reading sensors…
Controls & Instrumentation
Differential Pressure Sensor
A Differential Pressure Sensor measures the pressure difference between two points, such as across a filter, coil, pump…
Controls & Instrumentation
Field Device
A Field Device is a sensor, actuator, transmitter or switch installed on equipment or in a space that…
Controls & Instrumentation
Flow Meter
A Flow Meter measures the volumetric or mass flow rate of a fluid in a pipe using technologies…
Controls & Instrumentation
Flow Switch
A Flow Switch is an instrument that detects whether liquid or air is moving through a pipe or…
Controls & Instrumentation
I/O Schedule
An I/O Schedule (input/output schedule) tabulates the physical and virtual signals connecting a controller to field devices, listing…
Controls & Instrumentation
PID Loop
A PID Loop (Proportional-Integral-Derivative) is a feedback control algorithm that continuously adjusts an output to drive a measured…
Controls & Instrumentation
Points List
A Points List is a register of every input and output monitored or controlled by a building-management or…
Controls & Instrumentation
Pressure Transmitter
A Pressure Transmitter measures fluid or air pressure and converts it into a standardized output signal for the…
Controls & Instrumentation
Sequence of Operation
A Sequence of Operation (SOO) is the detailed, step-by-step definition of how a control system responds to conditions,…
Controls & Instrumentation
Supply Temperature Reset
Supply Temperature Reset is a control strategy that continuously adjusts the chilled-water or supply-air setpoint based on measured…
Controls & Instrumentation
Temperature Transmitter
A Temperature Transmitter is a field device that senses temperature, often via a thermistor, RTD or thermocouple, and…
Controls & Instrumentation
Trend Point
A Trend Point is a control-system value logged at intervals over time so its history can be reviewed,…
Controls & Instrumentation
Valve Actuator
A Valve Actuator is a device that positions a valve in response to a control signal, using an…
Controls & Instrumentation
VFD Control
VFD Control (Variable Frequency Drive control) regulates the speed of an AC motor by varying the frequency and…