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F 1100 Flow Meter Specifications: Onicon Electromagnetic Flow Sensor Sizing and Wiring
Quick Answer
The ONICON F 1100 electromagnetic flow sensor is a mag meter for chilled water, hot water, condenser water, and glycol lines in HVAC and process plants. It needs conductivity of 20 µS/cm or higher. For sizing and wiring, specify pipe size DN, flow range, temperature, pressure, liner, electrode material, power supply, and output signal. Silver Automation Instruments supplies a direct replacement model SMF-1100 with 4-20 mA HART, pulse, and RS485 Modbus RTU from DN15 to DN600.
What the F 1100 Flow Meter Measures and Where It Fits
The F 1100 is not a mechanical meter. There are no moving parts in the flow stream. It measures induced voltage when conductive fluid passes through a magnetic field. The measuring principle works for water, water-glycol mixtures, treated wastewater, seawater, and many chemicals. Silver Automation Instruments is a flow meter manufacturer and supplier for industrial process instruments. A paint plant in the Philippines used a DN50 F 1100 for latex binder feed. They needed the pulse output for a PLC totalizer. The meter worked after we corrected the grounding ring on the PVC pipe.
F 1100 Flow Meter Specifications at a Glance
Typical published values for the ONICON F 1100 include line sizes from DN15 to DN600, flow velocity 0.3 to 10 m/s, accuracy around ±0.5% of reading above 0.5 m/s, and repeatability ±0.15%. Standard liner materials are PTFE, PFA, and hard rubber. Standard electrodes are 316L stainless steel, Hastelloy C, titanium, and tantalum. Process temperature range is -20 to 60 °C for standard PTFE liner models. Pressure rating is PN16 to PN40 depending on flange and size. Power options are 24 VAC/DC or 110/220 VAC. Outputs are 4-20 mA, pulse, and digital bus such as BACnet MS/TP or Modbus RTU on some boards.
The Silver Instruments SMF-1100 direct replacement covers DN10 to DN600, accuracy ±0.2% of reading for flow above 0.3 m/s, and 4-20 mA HART as standard. It also includes RS485 Modbus RTU, pulse, and alarm output. Power options are 220 VAC, 24 VDC, and battery powered remote versions. The standard liner is hard rubber or PTFE. Electrode options include 316L, Hastelloy C, titanium, and tantalum.
Sizing the F 1100 Electromagnetic Flow Sensor
Start with normal flow, not pump maximum. For water and HVAC, target 2 to 3 m/s at normal load. The maximum continuous velocity should stay under 5 m/s. Short spikes can reach 10 m/s but that accelerates electrode wear and liner wear. Use this formula as a quick check. Q m3/h = 0.002827 x D squared x velocity, where D is inside diameter in millimeters and velocity is meters per second. A DN100 pipe at 2 m/s gives about 56.5 m3/h. A DN150 pipe at 2 m/s gives about 127 m3/h. A DN200 pipe at 2 m/s gives about 226 m3/h.
Here is the thing. Most engineers size by pipe diameter only and then the meter runs below 0.3 m/s at night. Low velocity causes unstable readings. If the normal flow is below 0.5 m/s, reduce the meter size or use a reduced spool. Also check low flow on weekends. A chilled water header in Malaysia had a DN200 line but only 35 m3/h during low load. That is about 0.31 m/s. The reading was unstable. We supplied a DN150 meter with reducers after checking the line pressure drop.
ONICON F 1100 Wiring and Signal Connections
In practice, wiring mistakes cause more field failures than sensor defects. Because the signal is weak, cable routing matters more than many contractors expect. Use 18 to 22 AWG shielded twisted pair for 4-20 mA and pulse signals. The shield should be grounded at the PLC or control panel only. Do not ground the shield at both ends. Keep the signal cable at least 300 mm away from VFD cables, motor cables, and power cables. In a plant in Vietnam, a DN100 F 1100 on a chilled water line gave a 4-20 mA signal that drifted. The cable was in the same tray as a 90 kW pump VFD cable. We reran the signal cable in a separate conduit and the loop settled to within 0.2% of the reference flow.
For power, check the nameplate voltage be
Liner, Electrode, and Grounding for Water, Seawater, and Wastewater
For clean HVAC water, hard rubber or PTFE liner with 316L electrodes is enough. For seawater desalination plant brine lines, select PTFE or PFA liner with Hastelloy C or titanium electrodes. For raw sewage and sludge, use hard rubber liner and 316L electrodes with grounding rings. A customer in Saudi Arabia ordered a DN80 seawater flow meter for a desalination plant brine line. That brine line used Hastelloy C electrodes, a PTFE liner, and titanium ground rings. The meter has run for 18 months without electrode pitting.
Installation Straight Run and Empty Pipe Conditions
Install the F 1100 away from strong electromagnetic interference, pumps, control valves, and partially full pipes. Standard straight run is 10D upstream and 5D downstream after a pump, elbow, or control valve. For a simple pipe with no disturbance, 5D upstream and 3D downstream is often enough. The meter must remain full of liquid. For horizontal lines, install the meter at the low point. For vertical lines, flow should go upward. Empty pipe detection helps when the line drains after a batch. It prevents the transmitter from reading false flow on an empty pipe.
FAQ: F 1100 Flow Meter Selection and Wiring
What is the accuracy of the ONICON F 1100 electromagnetic flow sensor?
The typical published accuracy is ±0.5% of reading above 0.5 m/s. The Silver Instruments SMF-1100 has a published accuracy of ±0.2% of reading above 0.3 m/s for many sizes.
What pipe sizes does the F 1100 support?
Standard models cover DN15 to DN600. Common HVAC sizes are DN32 to DN300. Check the liner and flange rating when you go above DN300 because pressure rating and straight run requirements change.
What wiring connections are on the F 1100?
Typical terminals include power, 4-20 mA loop, pulse output, and digital bus such as BACnet MS/TP or Modbus RTU. Use shielded twisted pair cable. Ground the shield at the panel only. Keep the cable away from VFD drives and motor cables.
Can the F 1100 measure seawater or wastewater?
Yes with the correct materials. For seawater, choose PTFE or PFA liner with Hastelloy C or titanium electrodes. For wastewater, hard rubber liner with 316L electrodes is common. Conductivity must be at least 20 µS/cm. Lower conductivity fluids need special electrode designs.
What straight run does the F 1100 need?
Use 10D upstream and 5D downstream after a pump, elbow, or control valve. Use 5D upstream and 3D downstream for simple straight pipe. The pipe must stay full. For horizontal runs, install the meter at the low point.
Get a Specific Quote for Your F 1100 Replacement
If you need a price quote, send Silver Automation Instruments your pipe size DN, fluid type, conductivity, temperature in °C, pressure in bar, normal flow in m3/h, maximum flow, output signal, power supply, and flange standard. If you have the existing ONICON F 1100 tag number, include it. We recommend the Silver Instruments SMF-1100 for most HVAC and process water applications. It fits between flanges with EN 1092-1 PN16 or ANSI 150 drilling. Standard lead time is 5 to 10 working days for DN15 to DN300. Larger sizes take 2 to 3 weeks.
Contact Silver Automation Instruments at Tel +86-25-68650347, Whatsapp +86-25-52155837, or WeChat +86 15365082610. You can also search flow-meter.com.au for the electromagnetic flow meter series. We support water and wastewater plants, HVAC contractors, food and beverage lines, and chemical plants in Vietnam, Malaysia, Philippines, Mexico, Chile, UAE, and South Africa.
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