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1 Inch PVC Flow Meter Schedule 80 Chemical and Water Inline Sensors
Quick Answer: A 1 inch PVC flow meter with Schedule 80 connections is a direct replacement for metal inline sensors on low pressure chemical and water lines. The PVC body resists acid, alkali, and salt solution at ambient temperature. Silver Automation Instruments supplies the DN25 inline sensor with pulse, 4-20 mA, or RS485 output for industrial skids and process water monitoring.
Why Schedule 80 PVC Works for Chemical and Water Lines
Schedule 80 PVC has a thicker wall than Schedule 40 PVC. For 1 inch nominal pipe the fitting outer diameter is 1.315 inch or 33.4 mm. The wall thickness is about 0.179 inch or 4.5 mm. This thicker section reduces the chance of cracking on chemical dosing skids that shake or run with small reciprocating pumps.
Because the wetted body is non metallic it does not corrode in coastal air or salt mist. That matters in Southeast Asia, Pacific islands, West Africa, and the Middle East. A water treatment contractor in Vietnam ordered 16 units last quarter for a sodium hypochlorite dosing panel. The meters replaced brass sensors that failed after eight months.
What the 1 Inch Inline Sensor Can Measure
The DN25 inline sensor fits a 1 inch Schedule 80 PVC pipe run. It works for clean water, cooling water, sodium hypochlorite, citric acid, caustic soda, and many dilute chemical solutions. Do not use PVC with strong solvents like acetone, MEK, or toluene. The plastic body softens and the joint may leak.
Most engineers use this meter on chemical dosing skids, desalination feed lines, irrigation water, and water batching panels. Food and beverage plants use it for clean water transfer. Because the sensor body is PVC it adds no iron or copper contamination to the process water.
Sensor Type and Output Options
This 1 inch PVC flow meter can be ordered as a paddle wheel sensor or an electromagnetic inline sensor. The paddle wheel version costs less and works well in clean water. The electromagnetic version has no moving parts and handles dirty water better. Both versions fit Schedule 80 unions or flanged connections.
Output options are pulse, 4-20 mA current loop, and RS485 Modbus. HART is available on the 4-20 mA model. A chemical plant in Saudi Arabia integrated the HART signal into a DCS for a dosing loop. The 4-20 mA signal covered 0 to 10 m3/h on a 1 inch line.
Flow Range and Accuracy for DN25
The typical flow range for a 1 inch DN25 line is 0.2 to 10 m3/h. Accuracy depends on the sensor type. A paddle wheel version may reach 1 percent of full scale. An electromagnetic version may reach 0.5 percent of reading above 0.5 m3/h. Specify your minimum and maximum flow range when you send a quote request.
Here is the thing. A PVC flow meter is not a high pressure device. It is a chemical resistance tool. If you need high pressure or high temperature service we will recommend a different body material or a metal tube flow meter.
Installation and Straight Run Requirements
Install the meter in a pipe run that stays full of liquid. Keep at least 10 pipe diameters of straight run before the sensor and 5 pipe diameters after. For 1 inch pipe this equa
Mount the sensor in a horizontal or vertical upward line. Avoid mounting it at the top of a horizontal pipe where air can collect. For chemical tanks use a check valve downstream to prevent reverse flow from hammering the impeller or electrodes.
Pressure and Temperature Limits
At 20 degrees Celsius a 1 inch Schedule 80 PVC pipe has a pressure rating of about 14.8 bar. At 40 degrees Celsius the working pressure must be derated. Check the pressure graph for your exact fluid temperature. For continuous chemical dosing we recommend keeping the fluid below 35 degrees Celsius.
PVC also becomes brittle in freezing conditions. Do not install the meter in a line that can freeze. For outdoor installations in winter use heat tape and insulation around the PVC body.
Common Applications in Southeast Asia and Oceania
We have seen this meter on water treatment skids in the Philippines, desalination pilot plants in Australia, acid dosing panels in Malaysia, and cooling water loops in Chile. It also works for fertilizer injection in Israel and brine flow on small reverse osmosis units in South Africa.
Because the meter body is PVC it handles salt mist and humidity without surface rust. The electrical enclosure should still be IP65 or higher for outdoor washdown areas. Use a sealed cable gland and avoid direct sunlight on the display for long service life.
FAQ
What is the pressure rating of a 1 inch Schedule 80 PVC flow meter? At 20 degrees Celsius the pipe body rating is about 14.8 bar. The sensor seal or union may have a lower rated pressure. Confirm temperature and pressure together before ordering.
Can this meter handle sodium hypochlorite or sulfuric acid? Yes for sodium hypochlorite at low concentration and ambient temperature. PVC is also compatible with sulfuric acid below 80 percent by weight at room temperature. Share the exact concentration for a compatibility check.
What output signals are available for the inline water sensor? Pulse output, 4-20 mA, and RS485 Modbus are standard options. HART is optional on the 4-20 mA version. Tell us which PLC or controller you use so we match the wiring.
How much straight run does a DN25 PVC flow meter need? Use 10 pipe diameters upstream and 5 pipe diameters downstream. For a 1 inch line this is about 254 mm before and 127 mm after the sensor.
What is the lead time for a 1 inch PVC flow meter? Standard units ship in 7 to 10 working days from Nanjing. Custom flow ranges or HART may add 5 working days. We ship by DHL, FedEx, or sea freight to Australia, Southeast Asia, the Middle East, Africa, and Latin America.
How to Request a Quote
Send us your fluid, concentration, flow range in m3/h, temperature in degrees Celsius, pressure in bar, and pipe size DN. Also state the required output signal and the connection type. Contact Silver Automation Instruments at Tel +86-135-1213-1526, WhatsApp 86-135-12131526, or WeChat +86 13512131526. You can also visit https://flow-meter.com.au for product datasheets and selection guides.
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