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Flowvis Flow Meter 1.5 Inch Installation: Correct Retrofitting Steps for Residential Filter Piping
Quick Answer: Shut off and drain the 1.5 inch filter line before you remove the old Flowvis meter. Mount the new DN40 flow meter with the flow arrow pointing in the actual water direction, and add grounding rings if the pipe is PVC or PPR. Silver Instruments recommends the SFE-40 electromagnetic flow meter for this retrofit because it has no moving parts and works well with drinking water conductivity above 50 µS/cm.
Site Check Before You Cut Pipe
Residential filter piping often uses PVC, PPR, brass unions, or stainless steel tube. Check the actual inner diameter first. A 1.5 inch schedule 40 PVC pipe has a different bore than a 1.5 inch stainless steel tube. Measure the pressure and temperature at the filter outlet. Most home and light commercial filter skids run at 2 to 6 bar and 5 to 35 °C. If your line pressure exceeds 10 bar, use a metal flow tube or a wafer body meter with a higher pressure rating.
You need roughly 300 mm of straight run before the meter and 150 mm after it. In practice, many filter skids do not have this space. If you have a tight skid, install a flow conditioner or use a meter that tolerates shorter straight runs. The SFE-40 from Silver Instruments handles 5 diameters upstream and 3 diameters downstream in stable flow after a factory zero adjustment.
Remove the Old Flowvis Meter
Close the isolation valves upstream and downstream of the filter. Open a drain valve to release pressure. Wait until the pressure gauge reads zero. Then loosen the union nuts or flange bolts slowly. Keep a bucket under the pipe because filter housing water often contains sediment. Remove the old meter and inspect the threads. If the threads show cracks or cross threading, cut the pipe back and install new unions.
Install the New 1.5 Inch Meter
For a DN40 electromagnetic flow meter like the Silver Instruments SFE-40, install the meter between two unions or between two flange adapters. Keep the flow arrow on the meter body aligned with the actual water flow direction. Many installation errors come from a reversed meter. Tighten the fittings evenly. Do not use the meter body as a lever. Use a backing wrench on the adjacent fitting.
Because most residential filter pipes are PVC, the meter needs an earth connection. Use a grounding ring on each side or a meter with built-in grounding electrodes. Silver Instruments supplies the SFE-40 with 316L electrodes and an optional grounding ring set for plastic pipes. Without proper grounding, the reading will be unstable.
Electrical Wiring and Output Check
For the Silver Instruments SFE-40, wire the 24 V DC supply and the 4-20 mA HART loop acc
Start-up and Verification
Open the upstream valve slowly. Let the pipe fill and wait two minutes for trapped air to clear. Then open the downstream valve. Check the local display for a stable flow value. A healthy reading for a 1.5 inch residential filter loop is often between 0.5 and 8 m3/h. Compare the flow totalizer against a bucket test for a low flow check. For a 100 litre bucket, the totalizer should add 0.1 m3.
If the meter shows negative flow during a forward run, stop the pump and reverse the flow direction setting in the menu or swap the meter orientation after depressurizing. On the SFE-40 you can change the flow direction parameter without rewiring.
Common Retrofitting Mistakes
We have seen these issues on customer sites in Vietnam, the Philippines, and Saudi Arabia. The most common mistake is installing a meter directly after an elbow or a filter outlet. The flow profile is distorted. The second mistake is no grounding on PVC lines. The third is using a turbine or paddle meter on water with iron sediment. That sediment clogs the rotor. The SFE-40 has no rotor and no moving parts, so it fits retrofit jobs where the old Flowvis meter was a turbine type.
FAQ
Can I replace a Flowvis 1.5 inch flow meter with a Silver Instruments electromagnetic meter on a plastic pipe?
Yes. Use the DN40 SFE-40 with grounding rings and 316L electrodes. The water must have conductivity above 50 µS/cm. Most drinking water and bore water meets this.
What straight pipe run is required for the SFE-40 in a residential filter skid?
Five diameters upstream and three diameters downstream are enough for stable flow. If you have a pump or an elbow close to the meter, use ten diameters upstream.
What output signals does the SFE-40 provide?
4-20 mA HART, pulse, and RS485 Modbus RTU are available. The pulse output can connect to a local totalizer or a dosing controller.
What is the pressure and temperature limit for the SFE-40?
Standard version is rated for 10 bar at 60 °C. For higher temperatures up to 80 °C, use the PFA liner option.
How do I get a price and lead time for the 1.5 inch retrofit meter?
Send us your pipe size, pressure in bar, temperature in °C, flow range in m3/h, and whether the pipe is PVC or metal. Contact Silver Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610.
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