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Flow Meter 3/4 Threaded Fittings: Inline Digital Flow Tracking for Chemical Dosing
Quick Answer: Silver Instruments supplies 3/4 threaded digital flow meters for chemical dosing lines. These inline meters show real time flow rate and total volume. Choose DN15 with PTFE or PVDF wetted parts for sodium hypochlorite, acid, antiscalant, or polymer.
Why 3/4 Threaded Fittings Fit Most Dosing Lines
Dosing pumps often use 3/4 inch connections at the discharge side. This size matches DN15 pipe or hose. The threaded connection keeps installation simple. You can remove the meter without cutting pipe. In practice, maintenance teams in water plants and chemical sites prefer this setup.
Here is the thing. A 3/4 threaded meter mounts right after the dosing pump. It captures small flow rates and shows mL/min, L/h, or GPH. Totalizer values help operators check daily chemical consumption.
Key Specifications for Chemical Service
Our 3/4 threaded digital flow meter for chemical dosing runs on 24 VDC. Outputs include 4-20 mA, pulse, and RS485 Modbus RTU. Accuracy is 0.5 percent of reading for most models. Flow range starts around 0.03 L/min and goes up to 10 L/min depending on chemical viscosity.
Wetted materials matter more than any other factor. For aggressive chemicals, select PTFE or PVDF body with ceramic electrodes on electromagnetic types. For non conductive fluids such as some solvents or oils, select an oval gear meter with PPS or aluminum body. Seal options include FKM, EPDM, or FFKM.
Chemical Compatibility and Wetted Parts
Common chemicals include sodium hypochlorite, sulfuric acid, citric acid, ferric chloride, polymer flocculant, and antiscalant. Sodium hypochlorite off gassing can cause air bubbles. Mount the meter low in the line and keep back pressure above 0.2 bar. This avoids false readings.
For acid dosing, PTFE liner with tantalum electrodes works well. For polymer, check viscosity before selection. High viscosity can reduce flow range. Tell us the chemical name, concentration, temperature (°C), and flow rate. We will match the right wetted materials.
Field Example: Vietnam and Oman
A water treatment plant in Vietnam installed a 3/4 threaded electromagnetic meter after a dosing pump. The chemical was 10 percent sodium hypochlorite. Flow rate was 1.8 L/h. The meter used PVDF body and FKM seals. Output went to the plant SCADA through 4-20 mA.
A desalination plant in Oman needed antiscalant dosing at 0.6 L/h. A 3/4 threaded oval gear meter handled the low flow with 0.5 percent accuracy. Daily totals went through RS485 Modbus. This data reduced chemical waste by 12 percent over three months.
How to Size a 3/4 Threaded Meter
Most engineers skip this
Pressure and temperature also matter. Most 3/4 threaded meters handle PN10 or PN16. Temperature range is usually 0 to 80 °C. Some PTFE models extend to 120 °C. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will recommend a model.
Model Recommendation
For conductive chemicals, start with Silver Instruments SIA-EM-15. It is a 3/4 threaded electromagnetic flow meter with digital display. Wetted parts include PTFE and Hastelloy electrodes. Outputs are 4-20 mA, pulse, and RS485. For non conductive liquids, use Silver Instruments SIA-OG-15. It is an oval gear flow meter with 3/4 threaded connections. Both models support totalizer reset, alarm output, and batching control.
We stock spare seals and display assemblies. We ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Contact Silver Automation Instruments for a same day quote. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. Visit flow-meter.com.au for the full chemical dosing flow meter range.
FAQ
What flow rate can a 3/4 threaded meter measure?
Electromagnetic models can measure from 0.03 L/min to 10 L/min. Oval gear models can measure from 0.005 L/min to 5 L/min. Tell us your dosing rate and we will confirm the best model.
Can I use the same meter for acid and sodium hypochlorite?
Not always. Acid service often needs PTFE liner with tantalum electrodes. Sodium hypochlorite works with PVDF body and FKM seals. Share your full chemical list and we will select one meter body or suggest separate meters.
Does the meter work with a dosing pump pulse signal?
Yes. The meter accepts flow input from the pump or sends pulse output to a PLC. You can also use 4-20 mA for analog trend tracking. Modbus RTU gives digital total volume and diagnostic data.
What maintenance does a 3/4 threaded chemical flow meter need?
Rinse the meter after batch runs for sticky chemicals. Check the seal monthly. If bubbles appear, flush the line and increase back pressure. The display assembly is replaceable on Silver Instruments models.
How do I request a quote?
Send us your chemical name, concentration, flow range, pressure, temperature, and pipe size. We will reply with model, wetted materials, and price. Use Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610.
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