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『Flocat Mfe Electromagnetic Flow Meter Manual: Wiring and Sizing for Waste Streams』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
Flocat MFE Electromagnetic Flow Meter Manual: Wiring and Sizing for Waste Streams
Quick Answer: For waste streams, size the Flocat MFE electromagnetic flow meter by pipe inner diameter and target a flow velocity between 0.5 and 5 m/s. Wire the converter with a separate shielded signal cable, connect the ground ring on plastic or lined pipe, and use 4-20 mA or pulse output for the control system. Send your pipe size in DN, flow range, pressure, and conductivity to Silver Automation Instruments for a fixed quotation.
Wiring the Flocat MFE for Waste Streams
Flocat MFE electromagnetic flow meters on waste lines need clean power and signal separation. Use 85 to 265 V AC or 24 V DC supply per the converter terminal block. Do not run the signal cable in the same conduit as the motor cable. A shielded twisted pair cable with a separate earth wire removes noise from pumps and aerators.
Terminal L and N are for power on most converters. Terminal I plus and I minus give 4-20 mA output. Terminal P plus and P minus give pulse output. For Modbus RS485, use terminal A and B. The manual shows a ground screw on the sensor body. Connect a 4 mm square copper earth wire from this screw to the plant earth bar.
Grounding and Cable Routing
Waste water has low conductivity in some cases. Rainwater runoff or filtered effluent can drop below 50 µS/cm. For these liquids, use a grounding ring or grounding electrode. Metal pipes usually provide a path. Plastic or fiberglass pipes do not. That is a common cause of zero drift.
Route the signal cable at least 300 mm away from VFD cables. If the cable crossing is unavoidable, cross at 90 degrees. Use a continuous cable without junctions. Every junction adds resistance and noise.
Sizing for Waste Streams
Here is the thing. Waste stream sizing is not about accuracy class first. Size the electromagnetic flow meter by the pipe diameter, not the pump capacity. For waste water, a velocity of 1 to 3 m/s is reliable. Avoid velocities above 5 m/s for abrasive sludge. For DN100 pipe, a flow range of 28 to 85 m3/h covers most municipal waste lines. For DN200 pipe, the range is roughly 113 to 340 m3/h at 1 to 3 m/s.
Liners matter more than accuracy class on waste streams. PTFE liner handles chemical effluent, high temperature up to 120 °C, and biofilm. Polyurethane liner is better for abrasive grit and mining tailings. Neoprene liner works for clean water and light sewage but fails quickly on solvent waste.
Flow Velocity and Straight Run Requirements
The Flocat MFE manual recommends 10 DN straight pipe upstream and 5 DN downstream for custody transfer. On waste sites, 5 DN upstream and 3 DN downstream works when a flow conditioner is not possible. Avoid installing the sensor at the top of a horizontal pipe where air collects. Mount it in the lower half of the pipe or in an upward vertical section.
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A paper mill in Indonesia had unstable readings on a DN150 waste line. The sensor was mounted at the top of a horizontal pipe. After moving the sensor to a vertical riser, the empty pipe alarm stopped and the 4-20 mA signal became stable. This is a typical site fix.
Output and Control System Wiring
For a SCADA or PLC system, the 4-20 mA signal is the simplest. Add 4-20 mA HART if you need remote zero check and diagnostics. Waste plants in Australia and the Middle East often use pulse output for totalizing. Set the pulse width to 50 ms or 100 ms based on the PLC input speed.
For data logging, use RS485 Modbus RTU. This gives flow rate, totalizer, and empty pipe alarm. The empty pipe alarm is critical on waste lines because the sensor can read false flow when the line drains.
Direct Replacement and Sizing Help
Silver Automation Instruments offers an electromagnetic flow meter replacement for Flocat MFE on waste streams. We supply DN15 to DN600 sensors with PTFE or polyurethane liner, 316L, Hastelloy C, or titanium electrodes, and 4-20 mA HART or Modbus outputs. Tell us your pipe size, flow range, pressure, temperature, and fluid conductivity. We will send a fixed quotation within one working day.
Contact Silver Automation Instruments for waste water flow meter sizing and price. Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526.
FAQ
Q: What is the minimum conductivity for the Flocat MFE on waste water?
A: The standard converter needs at least 20 µS/cm. For rainwater or RO permeate, use a high conductivity option or add a grounding ring. Sludge and raw sewage usually exceed 100 µS/cm.
Q: Can I install the MFE on a partially filled waste pipe?
A: No. Electromagnetic flow meters need a full pipe. Install it in an upward vertical section or a U-shaped section that keeps the sensor flooded at all times.
Q: What liner should I choose for waste with grit and sand?
A: Polyurethane liner is the standard for abrasive waste. For chemical effluent with solvents, choose PTFE. For food plant waste with hot water and CIP chemicals, PTFE with 316L electrodes is recommended.
Q: How do I ground the sensor on a plastic pipe?
A: Use a grounding ring on both sides of the sensor. Connect the ring to the sensor ground screw and the plant earth bar. Do not rely on the process pipe for the earth path.
Q: What output signal works best for waste water billing?
A: Use pulse output for totalized flow. The converter pulse can drive a PLC or external totalizer. For remote monitoring, 4-20 mA HART or Modbus RTU is better because diagnostics are visible.
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in m3/h. We will recommend the right electromagnetic flow meter for your waste stream and provide a quotation on the same day.