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Flow Meter Products Catalog: Inline and Clamp-On Sensor Tech
Quick Answer: Inline flow meters require a pipe cut but deliver high accuracy for custody transfer, batching, and process control. Clamp-on sensors mount outside the pipe and are the fastest retrofit for water, chemical, and oil lines. Silver Automation Instruments supplies inline and clamp-on models with outputs like 4-20 mA HART, pulse, and RS485 Modbus RTU.
Inline Flow Meter Technologies That Cover Most Industrial Jobs
Most new flow metering projects in Vietnam, Indonesia, and the Middle East start with an inline meter. We see DN25 to DN300 electromagnetic flow meters used in wastewater lift stations. For chemical dosing, small oval gear flow meters with DN10 to DN50 sizes handle flow ranges from 2 L/h to 500 L/h. Coriolis mass flow meters cover DN3 to DN150 and give direct mass flow, density, and temperature without a separate density meter.
In practice, an inline electromagnetic meter is hard to beat for conductive liquids above 5 µS/cm. We have supplied Silver Instruments SEMF series magnetic flow meters to a water utility in the Philippines. The meter had a PTFE liner, a DN200 size, and a 4-20 mA HART output. It has run for three years with no drift. The installed cost was below a clamp-on ultrasonic with the same accuracy.
For oil and fuel, oval gear and Coriolis are common. A biodiesel plant in Malaysia uses Silver Instruments SCF series Coriolis meters on four batch lines. Each meter measures mass flow from 50 kg/h to 2000 kg/h. The customer needed 0.2 percent accuracy and Modbus RTU for the DCS. This is a typical request for Southeast Asia.
Clamp-On Flow Meter Choices for Existing Lines and Temporary Checks
Clamp-on ultrasonic meters do not touch the fluid. They strap to the outside of a pipe and use transit time difference to calculate velocity. This works on clean liquids with low solids or gas bubbles. We have installed clamp-on meters on chilled water lines in Australia and on seawater intake pipes in Saudi Arabia.
Here is the thing. Clamp-on meters are not right for every fluid. They need a fully filled pipe, a clean pipe surface, and enough straight run. For wastewater with high solids, a clamp-on Doppler meter can work, but accuracy is lower. Most engineers skip this part and then wonder why the reading jumps. We always ask for pipe material, wall thickness, and fluid type before quoting a clamp-on unit.
Silver Instruments SUF series clamp-on ultrasonic meters handle DN25 to DN3000 pipes. The sensors fit carbon steel, stainless steel, and PVC. Output options include 4-20 mA, pulse, and RS485. For a desalination plant in Oman, we supplied a clamp-on meter to check the high pressure brine line without shutting down the process. The pipe size was DN300 and the flow range was 50 to 500 m3/h.
How to Match Sensor Type to Fluid and Industry
Different fluids need different sensor principles. For conductive water and wastewater, use an inline electromagnetic meter. For oil, solvents, and non-conductive liquids, use an oval gear or Coriolis. For gas and compressed air, thermal mass or vortex meters fit well. For steam, use a vortex meter with built-in temperature and pressure compensation.
We have seen many customer sites in Latin America where a single flow meter type was ordered for every line. That does not work. A food grade inline electromagnetic meter with a PFA liner worked well on a juice line in Mexico. The same meter failed on a palm oil line in Indonesia because palm oil is non-conductive. The customer switched to a Silver Instruments SOF series oval gear meter and th
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Pressure transmitters and paperless recorders often ship with flow meters. A batch system may need a pressure transmitter on the pump discharge and a paperless recorder to log flow, pressure, and temperature. Silver Instruments SPT series pressure transmitters cover 0 to 400 bar with 4-20 mA HART. The SVR series paperless recorder accepts 1 to 16 universal inputs.
Price Factors and Lead Times for Inline and Clamp-On Meters
Inline meter price depends on size, liner, electrode material, and approvals. A DN50 electromagnetic meter with rubber liner and 316L electrodes costs less than a DN50 Coriolis mass flow meter for the same line. But the Coriolis gives direct mass flow and density. For small fuel oil measurement, an oval gear meter is often the lowest cost option. A DN15 oval gear meter with pulse output is under USD 400 for many orders.
Clamp-on meter price depends on pipe size and transducer type. A small clamp-on unit for DN50 to DN100 pipes is economical. Large pipe clamp-on systems for DN1000 and above cost more because of the transducer size and installation fixture. Lead time for standard Silver Instruments inline meters is 5 to 10 working days. Clamp-on meters with special transducer mounting usually ship in 7 to 12 working days.
For a specific quote, send us your fluid type, pipe size in DN, operating temperature in degrees Celsius, pressure in bar, and flow range in m3/h or kg/h. Call or message our team at Tel +86-25-68650347 or WhatsApp +86-25-52155837. WeChat is +86 15365082610. We reply within 24 hours on working days.
Frequently Asked Questions
Question: Can a clamp-on flow meter replace an inline meter for custody transfer?
Answer: In most plants, no. Clamp-on ultrasonic accuracy is usually 1.0 percent of reading under good conditions. Custody transfer often needs 0.2 percent or better. Use a clamp-on meter as a check meter or for temporary flow verification. Use an inline Coriolis or high accuracy electromagnetic meter for official transfer.
Question: What is the minimum conductivity for an electromagnetic flow meter?
Answer: Standard Silver Instruments electromagnetic meters need a fluid conductivity above 5 µS/cm. Most raw water, treated water, and wastewater meet this. Demineralized water and some solvents do not. For those, use a Coriolis mass flow meter or a capacitive electromagnetic meter.
Question: Which flow meter works for diesel and light oil?
Answer: Oval gear and Coriolis meters both work. Oval gear is lower cost for simple batching and totalizing. Coriolis gives direct mass flow, density, and temperature. For diesel loading racks in Southeast Asia, we often supply Silver Instruments SOF series oval gear meters with pulse output to a batch controller.
Question: Do you supply flow meters for hazardous areas?
Answer: Yes. Many Silver Instruments flow meter series have ATEX Zone 1 and Zone 2 approvals. Inline electromagnetic, Coriolis, vortex, and oval gear meters can be supplied with flameproof or intrinsic safety electronics. Tell us the gas group and temperature class for your site.
Question: How do I send an inquiry to Silver Instruments?
Answer: Send your fluid type, pipe size in DN, operating temperature in degrees Celsius, pressure in bar, and flow range to Tel +86-25-68650347 or WhatsApp +86-25-52155837. You can also reach us on WeChat at +86 15365082610. We respond within 24 hours on working days.
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