Onicon F3500 Series Insertion Electromagnetic Flow Meter
Onicon F3500 Series Insertion Electromagnetic Flow Meter

Onicon F3500 Series Insertion Electromagnetic Flow Meter

3 minutes, 9 seconds Read

ONICON Incorporated’s F-3500 series insertion electromagnetic flowmeters are suitable for measuring electrically conductive liquids in a wide variety of applications.Onicon F3500 Series

Each F-3500 provides a single analog output for flow rate, a high-resolution frequency output to drive peripheral devices, scalable pulse output for totalization, and an empty pipe alarm signal. Two versions of the F-3500 are now available.

The standard configuration F-3500 is suitable for pipe sizes ranging from 3” to 72” in diameter. The small pipe configuration F-3500 is suitable for pipes ranging in size from 1¼” to 2½” in diameter. Optional remote displays and BTU measurement systems are also available for both versions.

The FB-3500 Electromagnetic Flow Meter is available for bi-directional flow applications. It provides an analog output for flow rate, a contact closure output to indicate flow direction and separate pulse outputs to totalize forward and reverse flow.


Simple Installation and Commissioning

Factory programmed and ready for use upon delivery.

Exceptional Performance & Value

Cost-eff ective insertion style design provides accuracy and reliability normally only found in more expensive full bore devices.

Excellent Long Term Reliability

Low maintenance, no-moving-parts fl ow sensing technology works well in diffi cult flow measurement applications such as open loop condenser water flow.

Highly Accurate Over a Wide Flow Range

Highly effi cient sensor design and continuous auto-zero function improve accuracy and sensitivity, particularly at low fl ow rates.

Simplifi ed Hot Tap Insertion Design

Standard on every insertion fl ow meter, this feature allows for insertion and removal by hand without a system shutdown.

Ideal Solution for Retrofits

The innovative hot tap adapter design allows for wet tapping pipes without interrupting fl ow


  • Accurate, reliable flow measurement for HVAC applications
  • Ideal for monitoring open-loop condenser water flow
  • Hot tap design simplifies domestic water retrofit installations
  • The cost-effective way to monitor flow in larger pipe sizes
  • Suitable for use in water and water/glycol systems

Typical Applications

The F-3500 is ideal for chilled water, hot water, domestic water, condenser water and municipal water applications.


Accuracy ±1.0% of reading from 2 – 20 ft/s
± 0.02 ft/s below 2 ft/s
Flow Range 0.1 ft/s to 20 ft/s (200:1 turndown)
Sensor Method Electromagnetic sensor (no moving parts)
Pipe Size Range Standard Configuration: 3- 72” nominal diameter
Small Pipe Configuration: 1¼ – 2½” nominal diameter
Input Power 20 – 28 VDC, 250 mA at 24 VDC
20 – 28 VAC, 60 Hz, 6 VA
Temperature Range 15°F to 250°F
Ambient Temperature Range -20°F to 150°F
Operating Pressure 400 psi maximum
Pressure Drop Standard Configuration: 0.1 psi at 12 ft/s in 3” pipe, decreasing as line size increases
Small Pipe Configuration: 0.33 psi at 8 ft/s in 1.25” pipe, decreasing as the line size increases
Output Signal Provided Analog Output (Isolated) Selectable: 4-20 mA, 0-10 V or 0-5 V
Frequency Output 0-15 V peak pulse, 0-500 Hz
Scalable Pulse Output Isolated solid-state dry contact
Contact rating: 50 VDC, 100 mA maximum
Pulse duration: 0.5, 1, 2 or 6 second
Material Wetted metal components: 316 Stainless Steel
Sensor head: XAREC
Optional: NSF/ANSI 61/372 version
Electronics Enclosure Weathertight NEMA 4 aluminum enclosure
Electrical Connections 10’ of PVC jacketed cable with ½” NPT conduit connection
Dedicated earth wire required
4-wire minimum for power and analog output
Additional wires required for pulse, frequency and alarm outputs

Ordering Information

Meter Model Number Coding= F-35AA–BB–CC–DEFG(-SPC)


AA = Insertion Electromagnetic Flow Meter

  • 00 = Insertion electromagnetic flowmeter

BB = Outputs

  • 11 = Frequency, isolated analog, scaled pulse and alarm (dry contacts)
  • 12 = Frequency, isolated analog, bi-directional, scaled pulse and alarm (dry contacts)*

CC = Pipe Size Range and Meter Length

  • A1 = 1.25 – 2.5” (F-3500 Small Pipe)
  • C3 = 3.0 – 10.0”
  • D4 = 3.0 – 16.0”
  • E5 = 3.0 – 22.0”
  • F6 = 3.0 – 72”

D = Process Connection

  • 1 = 1” NPT adapter. ⅜” stem

E = Wetted Material

  • 1 = 316 SS, XAREC, Viton, Temp < 150°F
  • 2 = 316 SS, XAREC, FKM, Temp ≤ 250°F
  • 3 = 316 SS, XAREC, EPDM, NSF rated for domestic water

F = Electronics Enclosure

  • 1 = NEMA 4 weathertight enclosure

G = Wiring Connection

  • 1 = 10’ PVC jacketed cable, pigtail with ½” conduit adapter

SPC = Special Configuration

*For 3” and larger pipes

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