- Temperature measurement instruments, industrial (92)
- Pyrometers, industrial process type (7)
- Resistance thermometers and bulbs, industrial process type (2)
- Temperature instruments: industrial process type (76)
- Thermistors, industrial process type (10)
- Thermocouples, industrial process type (27)
- Thermometers, filled system: industrial process type (11)
- Pressure measurement instruments, industrial (69)
- Differential pressure instruments, industrial process type (8)
- Manometers, industrial process type (1)
- Pressure gauges, dial and digital (38)
- Industrial flow and liquid measuring instruments (74)
- Flow instruments, industrial process type (101)
- Fluidic devices, circuits, and systems for process control (44)
- Gas flow computers, industrial process type (12)
- Level and bulk measuring instruments, industrial process (20)
- Liquid level instruments, industrial process type (23)
- Magnetic flow meters, industrial process type (12)
- Primary elements for process flow measurement (8)
- Turbidity instruments, industrial process type (2)
- Turbine flow meters, industrial process type (11)
- Viscosimeters, industrial process type (7)
- Industrial process measurement equipment (169)
- Analyzers, industrial process type (33)
- Annunciators, relay and solid state types (5)
- Computer interface equipment, for industrial process control (189)
- Controllers, for process variables, all types (141)
- Coulometric analyzers, industrial process type (3)
- Data loggers, industrial process type (21)
- Density and specific gravity instruments, industrial process (5)
- Digital displays of process variables (115)
- Draft gauges, industrial process type (14)
- Electrodes used in industrial process measurement (15)
- Electrolytic conductivity instruments, industrial process (16)
- Hydrometers, industrial process type (9)
- Infrared instruments, industrial process type (37)
- Panelboard indicators, recorders and controllers: receiver (13)
- Programmers, process type (69)
- Refractometers, industrial process type (4)
- Telemetering instruments, industrial process type (11)
- Thermal conductivity instruments, industrial process type (48)
- Time cycle and program controllers, industrial process type (13)
- Transmitters of process variables, stand. signal conversion (13)
- On-stream gas/liquid analysis instruments, industrial (39)
- Absorption analyzers: infrared, x-ray, etc.: industrial (12)
- Chromatographs, industrial process type (9)
- Liquid analysis instruments, industrial process type (16)
- Liquid concentration instruments, industrial process type (3)
- PH instruments, industrial process type (2)
- Water quality monitoring and control systems (323)
- Boiler controls: industrial, power, and marine type (17)
- Buoyancy instruments, industrial process type (2)
- Combustion control instruments (55)
- Humidity instruments, industrial process type (4)
- Industrial process control instruments (183)
- Moisture meters, industrial process type (13)
- Nuclear reactor controls (2)
- Potentiometric self-balancing inst., except X-Y plotters (4)
