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Sewage Flow Meter: Heavy-Duty Wastewater and Effluent Management Probes
Quick Answer: Silver Automation Instruments supplies full-bore magnetic flow meter probes with thick PTFE liners and Hastelloy C electrodes for raw sewage and final effluent. These meters ignore grease coating, handle 5% suspended solids, and keep ±0.5% accuracy even with low conductivity. Send your pipe size, flow range, and medium conductivity to [email protected] for a fast quotation.
Measuring untreated sewage eats ordinary flow meters in months. Rags and wipes snag on rotors. Grease builds an insulating layer on conductivity probes. Sand scours the measuring tube. A Malaysian treatment plant replaced ultrasonic clamp-on meters three times in two years. They switched to our Silver Mag 4100 full-bore electromagnetic probe. That meter has run four years with no cleaning and no drift.
Silver Instruments builds these probes with a smooth, obstruction-free flow tube. No moving parts. No electrodes sticking into the stream. The liner is 3 mm sintered PTFE, vacuum-formed and cured at 380 °C to eliminate pinholes. Electrode options include Hastelloy C-276, titanium, and tungsten carbide for grit-laden sludge. For fat and grease, we fit a mechanical scraper assembly. The operator pushes the scraper once per shift and the electrode tip stays clean. We have seen this exact setup work in a palm oil effluent plant in Indonesia where manual cleaning used to be a daily shutdown task.
Conductivity in raw sewage often drops to 500 µS/cm but can spike to 2000 µS/cm. The Silver Mag 4100 holds ±0.5% of reading from 5 µS/cm up to 100,000 µS/cm. Grounding rings made of 316L or Hastelloy are mandatory. We include a matched pair with every meter, sized to your flange standard. DIN, ANSI, and JIS flanges are all stock items. Nominal sizes range from DN15 to DN2000. Temperature range spans -25 °C to 80 °C for the compact version and up to 150 °C with a remote transmitter. Pressure rating is PN16 to PN40.
Output signals fit any SCADA or PLC. Every sewage meter ships with 4-20 mA HART, pulse, and RS485 Modbus RTU as standard. The transmitter housing is a dual-compartment cast aluminium shell rated IP67. For flooded chambers and underground pits, we offer IP68 remote sensors with submersible polyurethane cable. ATEX Zone 1 and Zone 2 approvals are available. A paint factory in Vietnam ordered six IP68 probes with Ex d IIC T6 certification after a methane pocket burst in their effluent trench. Those units have logged zero gas-related incidents in three years.
Here is the thing. Partial pipes and air slugs destroy the accuracy of any magnetic flow meter. We install empty pipe detection electrodes on every probe. W
Straight run requirements are short. You need just 5D upstream and 2D downstream. The tapered inlet and symmetrical magnetic field flatten the velocity profile so effectively that a 90° elbow half a diameter before the meter does not hurt accuracy. We validated this on our water calibration rig and share the test report on request.
Power supply options are 85-265 V AC or 24 V DC. The built-in data logger stores flow total, daily volume, and diagnostic events for 365 days. Extract logs via USB or Modbus. For off-grid sites we pair the meter with a solar panel and battery kit. A water authority in Tanzania runs twelve DN150 sewage meters this way. They receive hourly flow total SMS reports through an optional GSM module.
FAQ: Heavy-Duty Sewage Flow Meter Probes
What is the most reliable flow meter for untreated wastewater?
Full-bore electromagnetic flow meters with PTFE lining and Hastelloy electrodes. They pass rags, wipes, and grit without jamming. Silver Instruments recommends the Silver Mag 4100 for raw sewage and the Silver Mag 4300 with tungsten carbide electrodes for abrasive sludge.
Can your meters measure sludge with 8% solids?
Yes. Sludge with up to 10% solids is measurable as long as it flows and stays above 5 µS/cm. For thickened sludge we reinforce the liner and use ceramic electrode insulators. Always state the typical solids percentage when you send an inquiry.
How do I handle fat and grease buildup on electrodes?
Order a scraper electrode assembly. One push action cleans the electrode tip. Do it once per shift. For automated cleaning we supply an ultrasonic transducer ring. Describe your fat content in mg/L to [email protected] and we will propose the right cleaning method.
Do you offer ATEX or IECEx certified probes for biogas areas?
Yes. We supply ATEX Zone 1, Zone 2, and IECEx certified magnetic flow meters with Ex d explosion-proof enclosures. Wiring is via M20 glands. Send your zone classification and gas group. We will prepare a certified drawing package within 48 hours.
What information do you need to quote a sewage flow meter?
Send your pipe inner diameter (DN), minimum and maximum flow rate in m³/h, sewage temperature, conductivity if known, pressure in bar, and flange standard. A photo of the existing pipe helps. Email [email protected] or message us on WhatsApp at 86-135-12131526. For calls, dial +86-135-1213-1526. WeChat ID: +86 13512131526.