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Equipment and spare partsBrowse manufacturers Search by manufacturerFounded in 1987 in Florida, USA, ONICON Measurement Systems is a premier global innovator in high-precision flow and thermal BTU energy measurement for commercial HVAC facilities, central heating and cooling plants, data centers, and industrial process monitoring. We supply genuine ONICON electromagnetic, turbine, ultrasonic, thermal mass, and vortex flow meters with official NIST-traceable calibration.
ONICON F-3500 insertion and FB-3500 bi-directional electromagnetic flow meters are engineered for highly accurate liquid flow measurement in HVAC hydronic systems, central chilled water plants, condenser water loops, and district energy facilities. Hot-tap insertion hardware enables installation under operating pressures up to 400 psi (2.7 MPa) without system shutdown across pipe sizes from 1¼" up to 72" (DN32–DN1800). The electromagnetic sensing method delivers linear volumetric output across wide flow turndowns.
ONICON System-10 and System-20 BTU measurement systems are microprocessor-based instruments calculating thermal heating and cooling energy in hydronic water and glycol loops. Continuous calculation incorporates volumetric flow input and temperature differentials from matched platinum RTDs. Featuring a backlit alphanumeric display, they integrate natively into Building Management Systems via BACnet MS/TP, BACnet IP, Modbus RTU, and LonWorks protocols without secondary interface modules.
ONICON FT-3000 series inline flanged electromagnetic flow meters (FT-3100, FT-3200, FT-3300, and FT-3400) deliver high-accuracy measurement for conductive liquids without pressure drop. With no moving parts or internal obstructions, they offer PTFE and hard rubber liners combined with 316L stainless steel or Hastelloy C measuring electrodes to withstand continuous industrial operation.
ONICON F-1000 series turbine flow meters combine rugged mechanics with patented non-magnetic electronic rotor sensing. F-1100 features a single turbine, while F-1200 utilizes dual counter-rotating turbines to average turbulent velocity profiles across the pipe. Sapphire bearings and tungsten carbide shafts ensure extreme calibration stability and extended lifecycle in closed water circuits.
ONICON F-4300 and F-4200 clamp-on ultrasonic flow meters utilize high-precision transit-time acoustics. Transducers mount externally onto pipe walls without pipe cutting, welding, pressure drop, or process disruption. The portable battery-operated F-4400 meter features internal data logging, ideal for energy audits, flow verification, balancing, and field commissioning.
The ONICON System-40 is a compact, all-in-one thermal energy meter for sub-metering heating and cooling in commercial and residential tenant spaces. Integrating an inline ultrasonic flow sensor, a NIST-matched pair of platinum RTD temperature sensors, and a digital calculator, it accurately calculates energy across low differential temperatures (ΔT < 1°C) in fan coils and chilled beams.
ONICON F-5500 series thermal mass flow meters provide direct mass flow measurement for gases without requiring external temperature or pressure compensation. Utilizing thermal dispersion technology, they deliver high accuracy for natural gas in central boiler plants, industrial compressed air systems, biogas, nitrogen, and compressed air audits.
ONICON F-2000 (inline) and F-2500 (insertion) vortex shedding flow meters measure saturated and superheated steam, high-temperature gases, and clean liquids. Multivariable versions incorporate internal RTD temperature and solid-state pressure sensors with dynamic steam tables, calculating compensated mass flow rate in real time.
To ensure dependable meter installation without draining operating piping networks, ONICON delivers specialized Hot-Tap installation hardware assemblies. These packages include full-port brass or 316L stainless steel isolation ball valves, threaded and weld-on insertion saddles, gland packings, and graduated alignment rods for precise probe immersion depth.
All ONICON measurement products are manufactured at certified facilities conforming strictly to ISO 9001 quality management standards. Every flow meter undergoes individual wet calibration on closed-loop gravimetric flow test benches with official NIST-traceable calibration certificates. We supply instruments in heavy-duty packaging with comprehensive documentation.
Our instrumentation engineers calculate optimal meter configurations based on fluid electrical conductivity, operating temperature, static pressure, dynamic viscosity, and upstream/downstream piping velocity profiles. We determine exact immersion depths for hot-tap hardware and calibrate matched platinum RTD temperature sensor pairs for precise thermal energy calculations across hydronic heating and cooling systems.
We engineer and deliver ONICON measurement systems supporting native BACnet MS/TP, BACnet IP, Modbus RTU, and LonWorks protocols for seamless digital integration with major building automation platforms from Johnson Controls, Honeywell, Siemens, and Schneider Electric.
Every ONICON flow sensor undergoes individual multi-point wet calibration on closed-loop gravimetric flow test benches traceable directly to NIST standards. Matched temperature sensor pairs are calibrated in constant-temperature baths for sub-metering accuracy.
All genuine ONICON instruments are supplied directly from manufacturing facilities in heavy-duty protective packaging, accompanied by official NIST-traceable calibration certificates, installation wiring schematics, and quality inspection reports, backed by reliable international multimodal freight logistics.
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