Protective relays and monitoring relays detect or monitor for abnormal power system conditions

Frequency-to-voltage converters accept a signal and convert its frequency to a corresponding analog voltage level

Motor controllers receive supply voltages and provide signals to motor drives that are interfaced to motors. They include a power supply, amplifier, user interface, and position control circuitry

Overload relays prevent an electric motor from drawing too much current and overheating; includes thermal and solid state overload types

Electrical current sensors measure AC and/or DC current levels. They receive current inputs and provide outputs as analog voltage signals, analog current levels, switches, or audible signals

Battery and fuel cell test equipment consists of specialized test stations, stands or systems, monitors and component modules for performance or endurance testing. 

HVAC controllers are used to monitor and control heating, ventilation and air conditioning (HVAC) systems in buildings. They monitor indoor environmental factors such as temperature and humidity, and control heating and cooling to maintain desired levels

Instrument transformers are used to step-down current or voltage to measurable values. They provide standardized, useable levels of current or voltage in a variety of power monitoring and measurement applications

Laboratory controllers are designed specifically to monitor and/or control variables involved in laboratory or scientific experimentation, testing, or sample preparation. They are often used to control temperature, but may also control other variables

Aerospace contactors are high-performance, high-capacity circuit controls designed for aerospace applications.

Data loggers and data recorders acquire digital data from sensors and other signals. They are primarily used to store data for subsequent downloads to a host PC, but may also include real-time features such as monitors and alarms.

Data acquisition systems and instruments collect, digitize and process multiple sensor or signal inputs for the purpose of monitoring, analyzing and/or controlling systems and processes

Machine controllers and monitors use electronic numeric control and monitoring interfaces for programming and calibrating computerized machinery

Environmental controllers control environmental factors such as temperature, humidity, and air pressure. The environment to control can be an office or workspace, or inside a chamber for testing or process purposes.

Chart recorders and strip charts are data acquisition tools used to generate a plot, graph or other visualization of data versus time.