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SPI Mag Insertion Flow Meter: Economical Large-Pipe Adjustable Sensors
Quick Answer
The SPI Mag insertion electromagnetic flow meter measures conductive liquid flow in pipes from DN150 up to DN3000. Its adjustable insertion depth fits different pipe sizes without cutting the pipe or welding heavy spools. Most engineers choose this model when full-bore magmeters cost too much or shutdown time is short.
Why Insertion Instead of Full-Bore
Large pipe flow measurement gets expensive fast. A DN600 flanged electromagnetic flow meter can weigh over 200 kg and need a crane for installation. The SPI Mag insertion sensor weighs under 8 kg. One technician can install it through a 1-1/2 inch ball valve under pressure without draining the line. We have seen this on customer sites many times. A water utility in the Philippines measured flow in a DN900 raw water main without a single hour of service interruption. Total cost was about 15 percent of a full-bore magmeter quote.
The sensor sits only 10 to 30 mm into the flow stream. Not down the center. That sounds counterintuitive, but insertion magmeters measure velocity near the pipe wall and the transmitter calculates average flow velocity based on the pipe Reynolds number and roughness coefficient. The onboard algorithm compensates for the profile. In practice, accuracy holds at ±1.5 percent of reading above 0.3 m/s when the straight run meets ISO 7145 requirements of 20D upstream and 5D downstream.
Adjustable Sensor Depth Means One Meter Stocks Many Pipe Sizes
Distributors in the Middle East and Africa told us the same thing: stocking multiple meter sizes kills cash flow. The SPI Mag insertion probe comes with a lockable compression fitting and a scale marked in millimeters. Insert the probe to the right depth for DN200 or DN800, tighten the nut, and you are done. That adjustability cuts inventory from five models to one. A municipal contractor in Kenya uses the same SPI Mag on DN300 and DN700 asbestos cement pipes by simply changing the insertion setting in the transmitter menu.
The standard probe length is 350 mm. Extended versions reach 600 mm or 900 mm for pipes with thick linings or insulation. The electrode tip is machined from Hastelloy C-276 as standard. For seawater or brine, we fit titanium electrodes. The sensor body is 316L stainless with a PTFE insulator between electrode and ground. No moving parts, no bearings to replace.
What the Transmitter Can Do
Silver Instruments pairs the SPI Mag insertion sensor with the SPI Pro wall-mount or compact transmitter. Output options include 4-20 mA HART, Modbus RTU, and pulse. The display shows flow rate in m³/h, L/s, or gal/min, plus forward and reverse totalizers. Empty pipe detection comes standard. So does a conductivity monitor. The meter needs minimum 5 µS/cm liquid conductivity. That covers raw water, wastewater, cooling water, weak acids, caustic soda, pulp stock, and most industrial water-based fluids. Deionized water without additives will not work. Same goes for oils and hydrocarbons.
Power supply options are 85–265 V AC or 24 V DC. The housing is IP67 rated and suits outdoor installation in tropical regions. Ambient temperature range is -20 °C to +60 °C. Process temperature goes up to +120 °C with a PTFE sensor option. Pressure rating is PN16 standard, PN25 on request.
Hot Tap Installation Saves Shutdown Costs
Most SPI Mag installations use a hot tap procedure. Weld a 1-1/2 inch or 2 inch full-port ball valve onto the pipe. Mount the insertion tool onto the valve. Open the valve, push the probe through, set the depth, lock the compression seal. The whole job takes under two hours with a two-man crew. A chemical plant in Thailand installed three insertion points on DN500 cooling water headers during normal production. No process downtime. The alternative was a scheduled shutdown costing over USD 40,000 in lost output. Here is the thing: hot tapping requires a qualified welder and safe work permit. Not every site allows it. But for those that do, the SPI Mag saves weeks of planning.
If you cannot weld, the meter also comes with a saddle clamp for steel, ductile iron, or PVC pipes. A rubber gasket seals against the pipe surface. This works on low-pressure lines up to 10 bar. We do not recommend saddle clamps on gas or steam. Wrong application.
Grounding in Non-Conductive or Lined Pipes
Electromagnetic flow meters need a reliable ground to reject electrical noise. Metal pipes usually provide that through the sensor body contact. But lined pipes, plastic pipes, or pipes with internal epoxy coatings break the ground path. The SPI Mag
Calibration and Traceability
Each SPI Mag insertion sensor ships with a 5-point calibration certificate traceable to ISO/IEC 17025. Calibration is performed on a gravimetric test rig with accredited master meters. The certificate states the meter factor and flow rate deviations at 0.1, 0.3, 1, 5, and 10 m/s. This is not a dry calibration. Silver Instruments runs actual water through a DN200 reference pipe with the insertion probe mounted at the correct depth. Customers in Singapore and Australia have audited the calibration records and accepted them without question.
Recalibration interval is 24 months under normal service. Slurry or abrasive fluids may shorten that. The electrode tip is replaceable without buying a new sensor. Unplug the connector, swap the tip, and enter the new calibration factor into the transmitter. A spare tip costs a fraction of a full sensor.
Where the SPI Mag Fits in the Product Range
Silver Automation Instruments builds Coriolis mass flow meters from DN3 to DN200, ultrasonic clamp-on and inline flow meters, vortex flow meters for steam and gas, oval gear positive displacement meters for viscous oils, and thermal mass flow meters for compressed air and biogas. The SPI Mag insertion model fills the gap for conductive liquids in large pipes where other technologies become impractical or unaffordable.
For pipes under DN150, use a full-bore electromagnetic flow meter. The smallest pipe the SPI Mag handles is DN150 because the insertion probe needs enough flow profile development. For non-conductive liquids, switch to a clamp-on ultrasonic if pipe material permits, or an oval gear meter for small lines. We help customers select based on fluid type, pipe size, temperature, and budget. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Our application engineers respond within one working day.
Typical Orders and Customer Profiles
Last month a desalination plant in Saudi Arabia ordered 14 SPI Mag sensors for brine recirculation lines from DN400 to DN600. A palm oil refinery in Malaysia bought six units with titanium electrodes for fatty acid condensate at 90 °C. A municipal water board in Mexico specified 22 insertion meters with data loggers for district metered areas. All these orders shipped within three weeks because the insertion sensor is a standard product with adjustable length.
FAQ
Q: Can the SPI Mag measure raw sewage?
A: Yes, as long as the liquid has at least 5 µS/cm conductivity. Sewage typically exceeds that. The electrode tip is flush and self-cleaning in moderate velocity. For heavy grease, we recommend a retractable mount so you can pull the sensor for periodic wiping.
Q: What accuracy can I expect?
A: ±1.5 percent of reading from 0.3 to 10 m/s under proper installation conditions. Below 0.3 m/s, uncertainty increases. The transmitter can measure down to 0.05 m/s but do not expect high accuracy there.
Q: How deep should I insert the probe?
A: For most pipes, insert to 1/8 of the inner diameter from the wall. The transmitter menu has a setup wizard where you enter the pipe ID. It calculates the proper insertion depth automatically. Mark the probe at that value and lock it.
Q: Can the SPI Mag handle a partially full pipe?
A: No. The electrodes must remain submerged. For partially filled pipes, consider an open channel flow meter or a different approach. The empty pipe detection feature will trigger an alarm if the electrodes lose contact with the liquid.
Q: Do you have local service in my country?
A: Silver Instruments works through trained distributors in over 40 countries. Our offices in Nanjing, China handle complex technical support directly. We can arrange an online video call to walk your team through installation. Contact us on WhatsApp at +86-25-52155837 or call +86-25-68650347.
For firm quotes, send pipe specifications and fluid data to our team. Ask about the SPI Mag insertion flow meter price list and current lead times. Silver Automation Instruments supplies flow measurement equipment to industrial end users and distributors across Asia Pacific, Oceania, the Middle East, Africa, and Latin America.
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