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1 1/4 Inch Flow Meter: One-and-a-Quarter Inch Threaded Fluid Transducers
Quick Answer: A 1 1/4 inch flow meter fits DN32 pipe with BSP or NPT threaded connections. Silver Automation Instruments supplies oval gear, electromagnetic, vortex, and turbine models for this line size. Most units cover 2 to 200 L/min for liquids depending on viscosity and pressure drop.
What Is a 1 1/4 Inch Threaded Flow Meter?
A 1 1/4 inch threaded flow meter is a fluid transducer sized for DN32 process piping. The process connection uses male or female threads, most often BSP or NPT. Threaded bodies remove the need for flange gaskets and heavy mounting hardware. Engineers install these meters on small skids, fuel lines, chemical injection panels, and water dosing loops.
Silver Instruments treats this size as a standard product line. You can get a threaded fluid transducer in stainless steel, aluminium, or PTFE lined bodies. The right material depends on the fluid, temperature, and washdown requirements.
Key Specifications for One-and-a-Quarter Inch Fluid Transducers
Oval gear meters in 1 1/4 inch size typically measure 2 to 120 L/min. Accuracy is about 0.5 percent of reading for diesel, light oil, and solvent. Viscosity range can reach 1000 cP with the right gear material. Standard pressure rating is 10 to 16 bar. Standard temperature rating is -20 to 80 °C. A high temperature option takes this to 120 °C.
Electromagnetic flow meters in DN32 need a minimum conductivity of 5 µS/cm. They work well for water, wastewater, acids, and caustic. There are no moving parts. A 1 1/4 inch electromagnetic unit may handle 1 to 190 L/min. Typical accuracy is 0.5 percent of reading. Outputs include 4-20 mA HART, pulse, and RS485 Modbus. ATEX Zone 1 versions are available for hazardous areas.
Vortex flow meters in 1 1/4 inch work for steam, compressed air, and clean liquids. They need a minimum Reynolds number to generate a stable vortex street. In practice this means low viscosity liquids and proper upstream straight pipe. Output can be pulse or 4-20 mA with PT100 based temperature compensation for steam mass flow in kg/h.
Most engineers skip this part. They focus on the thread size and forget about straight pipe requirements. A threaded flow meter still needs stable flow. For oval gear and turbine meters you can install directly after a strainer. For vortex and electromagnetic meters keep 10D upstream and 5D downstream if possible.
Typical Applications for a 1 1/4 Inch Threaded Flow Meter
We see these meters on diesel generator feed lines across Southeast Asia and the Middle East. A standard setup is a 1 1/4 inch oval gear flow meter with pulse output connected to a fuel management panel. The meter monitors engine consumption and detects fuel theft or leakage.
Water treatment plants use this size for antiscalant and sodium hypochlorite dosing. The threaded connection allows quick replacement during shutdown. A chemical metering pump flow range often sits between 0.5 and 20 L/min. An oval gear or electromagnetic meter works depending on chemical conductivity.
Food and beverage sites use 1 1/4 inch threaded flow meters for edible oil batching, syrup transfer, and CIP water return. A paint manufacturer in Vietnam replaced paddle wheel sensors with oval gear meters because the paddle wheel bearings failed on solvent based coatings. The new meter lasted three years with standard maintenance.
Marine operators use these transducers for bunker fuel transfer, freshwater generation, and bilge water monitoring. The compact thread connection fits narrow engine room spaces. Silver Automation Instrum
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How to Choose the Right 1 1/4 Inch Flow Meter
Start with the fluid. For diesel, oil, and high viscosity liquids choose an oval gear meter. For water, wastewater, acid, and caustic choose an electromagnetic flow meter. For steam or compressed air choose a vortex meter. For clean low viscosity liquid with high turndown a turbine meter may work.
Then check pressure drop. A 1 1/4 inch meter has a smaller internal bore than a full bore DN32 tube. This matters for viscous fluids. Send us your viscosity in cP and flow range in L/min. We calculate pressure drop before quoting.
Next define the output. Pulse is common for totalising. 4-20 mA HART is common for process control and remote telemetry. Modbus works well for skid controllers and PLC integration. Silver Instruments can supply one meter with pulse, 4-20 mA HART, and Modbus on different models.
Finally confirm the thread type. BSP threads are standard in Australia, New Zealand, Southeast Asia, and the Middle East. NPT threads are standard in North America and parts of Latin America. We stock both patterns for 1 1/4 inch flow meters. If you are not sure, send a photo of the existing connection. We identify it before shipment.
Contact Silver Automation Instruments for a 1 1/4 Inch Flow Meter Quote
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We reply with a model, datasheet, and price in one working day. You can reach the sales team at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610. The company website is flow-meter.com.au.
If your fluid is not on the standard list, tell us the density, viscosity, and conductivity. We will recommend a threaded fluid transducer that fits the process. No general brochure talk. We give a specific part number and lead time. Silver Automation Instruments is the manufacturer for most threaded fluid transducer models.
FAQ: 1 1/4 Inch Threaded Flow Meter
What flow range does a 1 1/4 inch threaded flow meter cover?
Liquid models typically cover 1 to 200 L/min. The exact range depends on fluid viscosity, meter type, and pressure drop. An oval gear meter handles 2 to 120 L/min. An electromagnetic meter can cover 1 to 190 L/min. Steam and gas vortex meters use kg/h or m3/h ranges based on line pressure.
Which thread standard should I specify for a DN32 fluid transducer?
BSP and NPT are both common. For sites in Australia, Southeast Asia, Africa, and the Middle East we usually supply BSP threads. For Latin America we supply both patterns based on customer piping. Confirm the standard before ordering to avoid adapter fittings.
Can a 1 1/4 inch flow meter measure high viscosity oil?
Yes. Oval gear meters work for viscosity up to 1000 cP in this size. Heavier oil may need a wider meter body or reduced flow rate. We check pressure drop with your viscosity and flow range before quotation.
What output signals are available for a 1 1/4 inch threaded flow meter?
Pulse, 4-20 mA, HART, and RS485 Modbus are standard options. Some models also offer an integrated display with totaliser. ATEX Zone 1 versions can include the same outputs through an approved housing.
How do I get a price for a 1 1/4 inch flow meter?
Send your fluid, flow range, pressure, temperature, thread type, and output signal to Silver Automation Instruments. Use Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610. We return a specific model and quote without forcing you through a long web form.