| Absolute Process Instruments | | Manufacturer of plug-in industrial signal conditioners to convert industrial analog signals to the signal or alarm type needed. |
| Acromag | | Provides industrial I/O solutions for measurement and control applications. Signal conditioning, PC data acquisition, VME boards, 'LonWorks,' and IP modules for analog and digital I/O. Instrumentation products include transmitters, isolators, and alarms. |
| Almeg Controls | | Manufacturing controls and probes for level, flow, pressure and temperature. |
| Althen GmbH | | German manufacturer of sensors for pressure, force, weight, torque, distance, position, acceleration, inclination and levelling. Product catalogue, tech notes and newsletter. |
| American Aerospace Controls, Inc. | | Manufacturer and provider of AC and DC current, voltage, power and frequency transducers for industrial, laboratory, rail transit, defense and space applications. |
| Ameritrol Inc. | | Manufactures flow, level and temperature switches for the process control industry. |
| AMETEK | | A Global manufacture of electric motors and electronic instruments. |
| Analytical Technologies, LLC | | Specialist process film thickness measurement and control. Applicable for optically transparent thin films to opaque dielectric films. Integrated measurement solutions. |
| Anderson Instrument Co. | | Manufacturers a complete line of instruments for measurement of pressure, temperature, and level. These products include: gauges,pressure and level transmitters, liquid level monitors, danitary RTDs, digital indicating thermometers and recording controllers. |
| Anly Electronics Co., Ltd. | | Manufacturer of timer, counter, controller, floatless relay, relay, solid state relay and digital temperature controller. |
| Aqua Measure Instrument Co | | Online moisture measurement systems for paper, powders, chemicals, solids processing. Also, portable moisture meters. |
| Aquasant Messtechnik Ltd | | Manufacturers automatic interfacial layer control, level, product monitoring, concentration, turbidity, for liquids, powders or foams. |
| Aquilar Ltd | | Leak detection solutions for liquids and gases, including flood prevention, for water, oil, fuel, chemicals and detection of toxic, explosive gases and refrigerant gas. |
| Arjay Engineering Ltd. | | Industrial and environmental controls: level, flow, suspended solids, turbidity, oil in water, gas detection, spill alarms, claritek, hydrosense.. |
| Aseko | | Manufacturer of gas and vapour detectors, humidity and temperature measurement equipment, and control systems. Site in English and Czech. |
| ATEQ | | Produces leak and flow detectors with local calibration, service and support. |
| Automatic Timing and Controls | | Manufacturer of industrial instrumentation products including timing and control, panel meters, printers, calibrators, tachometers, phase monitors, and motor protection devices. |
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