The FSM-3 Series SuperMag represents the state-of-the-art in electromagnetic water flow measurement. By incorporating the latest in DSP technology, the FSM-3 Series achieves the performance of an inline mag meter with the installation ease and flexibility of an insertion style meter.

ONICON’s FSM-3 Series SuperMag Flow Meters are ideally suited for the demanding flow measurement requirements associated with today’s High Performance HVAC Industry applications. The FSM-3 will interface directly with the BAS/EMS system.

The FSM-3 is available in four fixed insertion pipe sizes, 6”, 8”, 10”, and 12”. Every FSM-3 is hand insertable up to 400 psi and hot tappable – no system shut down required!

The FSM-3 is designed to integrate seamlessly with an ONICON BTU meter, creating a complete, cost effective and incredibly accurate energy measurement system.


Features include:

  • Exceptional Performance & Value - Cost effective insertion style design provides the accuracy and reliability found in inline mag meters.

  • Multiple Outputs - Three programmable pulse outputs and one analog output are provided with each meter.

  • Simple Installation and Commissioning - Factory programmed and ready for use upon delivery. All process data and programming functions are accessible via front panel display and keypad.

  • User-friendly Interface - Commissioning is easy via the back-lit display and smart button technology. No special configuration tools needed!




The OAM II airflow measuring system provides accurate flow measurement in challenging outdoor air applications, as well as other airflow applications with limited straight ducts. The system consists of a dedicated multifunction transmitter with precision ultra-low differential pressure transducers and our proprietary uni-sensor airflow sensor.

Four analog outputs and native BACnet® or MODBUS® are included standard. Displayed data includes flow, temperature, velocity, dP, absolute pressure and operating status. This data is also provided to the network.


Features include:

  • Extended Flow Range Capability - All OAM II measurement configurations provide a 24:1 range of measurement - Well suited for variable flow applications.

  • Multiple BAS Interface Options - The OAM II includes four field configurable analog outputs and one RS485 interface for native BACnet MS/TP or MODBUS RTU.

  • Color Graphic Display with Interface - The backlit flow display can also provide temperature, velocity or dP data. The user interface has easy to use menu pages that eliminate the need for special tools.

  • Air Density Correction - The OAM II is provided with a temperature sensor and an internal absolute pressure sensor for air density correction - Enabling the OAM II to perform active density compensation and output actual or standard volumetric flow.


ONICON SYSTEM-40 BTU Measurement System

ONICON System-40 BTU Measurement System

The new System-40 BTU
Measurement System provides
highly accurate and reliable
thermal energy measurement in
heating and cooling systems. Its
compact, no-moving-parts
design and low cost make it
ideal for sub-metering heating and cooling costs in condominiums, retail shops and mixed use facilities. BACnet MS/TP or MODBUS RTU outputs are available. 3 Auxiliary pulse terminals can be configured for pulse input, pulse output, a combination of both, or even with a single analog output. 

Features include:

  • Available for use in pipe sizes ranging from 1⁄2” through 21⁄2” in diameter.

  • No-moving-parts flow meter design with excellent accuracy and turndown.

  • Precision matched platinum RTDs for accurate temperature measurement.

  • Native BACnet MS/TP or MODBUS RTU are available with auxiliary pulse terminals configurable for either pulse inputs, pulse outputs, a combination of the two, or even a single analog output.

  • EN1424 compliant

ONICON F-5500 Thermal Mass Flow Meters

icon F-5500 Thermal Mass Flow Meters

ONICON’s F-5000 Series
Thermal Mass Flow Meters
provide accurate mass flow
measurement of natural gas,
compressed air and other
industrial gases. The proprietary
design measures mass flow
directly and does not require
additional pressure or
temperature compensation to
deliver accurate flow rate and
total data. The F-5500 is
available as an inline or an
insertion style meter and
includes an easy to operate user
interface/display. The standard
version of the meter is provided
with a 4-20mA analog output and an RS485 interface that is field configurable for BACnet MS/TP® or Modbus® RTU. A second output signal configuration is available that includes a 4-20mA analog output and a programmable pulse output. The pulse output model is also available with HART. 

Features include:

  • Native BACnet® MS/TP or Modbus® RTU communication capability.

  • User interface with utility software capable of data logging, configuration and troubleshooting via micro USB port.

  • Zero flow validation with report generation capability.

  • Each F-5500 insertion meter is designed to be installed through a “retractor” assembly, allowing installation by hand in systems operating up to 60 psig.

  • FM approval for Class 1, Div. 1 installations.

  • Insertion meter available for use in pipe sizes ranging from 11⁄2’ through 24” in diameter.

  • Inline meter available for use in pipe sizes ranging from 3⁄4 through 6” in diameter.