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Long Term Clamp On Flow Meter: Permanent Dedicated Transit Array Pipe Monitors
Quick Answer
A long term clamp on flow meter gives permanent flow data without cutting pipe or stopping the process. A dedicated transit array pipe monitor uses multiple ultrasonic transducer pairs on one pipe to reduce flow profile error. Silver Automation Instruments supplies these meters for pipe sizes from DN15 to DN2000 across water, wastewater, chemical, and energy applications.
Why Use a Permanent Clamp On Flow Meter
Permanent clamp on flow meters do not touch the fluid. The transducers mount on the outside of a full pipe. There is no pressure drop and no risk of internal coating damage.
A fixed clamp on meter helps when the line cannot be shut down. Many water utilities and chemical plants in Vietnam, Indonesia, and Malaysia use clamp on mounting to add flow measurement on live pipes. The installation team fixes the transducers with stainless steel bands or magnetic brackets. The transmitter stays in a weatherproof enclosure.
Here is the thing. A long term clamp on meter is not a temporary survey tool. The meter is built for 24 hour operation. On a customer site in Saudi Arabia, a DN600 raw water line had no spare spool piece. The plant installed a dedicated clamp on meter in less than one shift.
What Is a Permanent Dedicated Transit Array Pipe Monitor
A transit array pipe monitor uses more than one ultrasonic path. Standard clamp on meters use one or two paths. An array uses three or four paths across the pipe cross section. The transmitter averages the velocity from each path.
An array design works well on large pipes where flow profile can be uneven after elbows, tees, or valves. The multiple acoustic paths reduce the need for very long straight pipe. In practice, most engineers specify an array when the pipe is DN300 or larger and the flow rate changes across the cross section.
The transducer pairs send ultrasonic signals through the pipe wall. The transit time difference between upstream and downstream signals gives the flow velocity. The transmitter converts velocity to flow rate based on the pipe diameter and wall thickness.
Key Specifications
Silver Instruments permanent clamp on meters cover pipe sizes from DN15 to DN2000. Standard accuracy is in the range of 0.5 to 1.0 percent of reading depending on pipe data, transducer type, and installation quality.
Fluid temperature for standard transducers is from -40 to 120 degrees C. High temperature transducers can reach 200 degrees C. The transmitter accepts a PT100 RTD input for heat flow or energy monitoring. Outputs include 4-20 mA HART, RS485 Modbus RTU, and pulse. Power options include 24 VDC and 100 to 240 VAC.
Line pressure does not directly affect external transducers but the pipe wall must be structurally sound. The transmitter can display volume flow in m3/h or mass flow in kg/h when fluid density is entered. Fluid viscosity up to 300 cP can be acceptable if the acoustic signal remains stable. Conductivity in µS/cm does not affect the clamp on meter because the transducer signal is acoustic and not electromagnetic.
Pipe materials can include carbon steel, stainless steel, PVC, HDPE, and lined pipe if the liner is bonded to the wall and the acoustic path is clear. For hazardous areas, Silver Instruments can supply ATEX
Installation and Commissioning Notes
The pipe must be full. The installation point should have stable flow. For standard clamp on meters, use a straight run of about 10 pipe diameters upstream and 5 pipe diameters downstream. Transit array systems can often work with shorter straight runs because the multiple acoustic paths average the flow field.
The installer enters pipe outer diameter, wall thickness, pipe material, and fluid type into the transmitter. A thickness gauge reading is better than a pipe schedule assumption. The wrong wall thickness changes the distance calculation and the flow reading.
Use proper acoustic coupling pads for permanent installations. Check signal strength and sound speed during commissioning. We have seen many customer sites where a weak signal came from loose coupling or a half full pipe.
Applications We See
A desalination plant in the Middle East uses a clamp on seawater flow meter on a brine discharge line. A wastewater treatment plant in Vietnam uses a permanent clamp on meter on a DN400 activated sludge recycle line. A chemical plant in Indonesia uses a clamp on meter with PT100 input to measure cooling water heat flow.
A paint manufacturer in Southeast Asia uses a dedicated clamp on meter for solvent batching. The meter sends 4-20 mA HART signals to a PLC. The operator reads total flow and flow rate from the local display. A mine in Western Australia uses a clamp on flow meter on a dust suppression water line.
How to Request a Quote
Send Silver Instruments your pipe size in DN, pipe material, wall thickness, fluid type, temperature, pressure, and flow range. We select the transducer type and transmitter configuration. You will receive a fixed quote with datasheet.
Contact Silver Automation Instruments at Tel: +86-135-1213-1526. You can also reach us on Whatsapp: 86-135-12131526 or WeChat: +86 13512131526. Technical datasheets are available on flow-meter.com.au.
FAQ
Can a clamp on flow meter be used as a permanent meter?
Yes. Use fixed mounting brackets, weatherproof enclosures, and permanent coupling pads. The transmitter runs continuously and sends outputs to a PLC or SCADA.
What is the minimum pipe size for a long term clamp on flow meter?
Standard clamp on meters can work from DN15. Dedicated transit array pipe monitors typically start at DN300 because the extra cost only makes sense on larger pipes.
Does a permanent clamp on flow meter work on wastewater?
Yes if the pipe is full and the liquid has limited gas or heavy solids. High solid loading can scatter the ultrasonic signal. We may recommend a Doppler type or an electromagnetic flow meter for high solids sludge.
What outputs are available from the transmitter?
4-20 mA HART, RS485 Modbus RTU, pulse, and PT100 input for heat flow metering are standard options.
Can Silver Instruments supply ATEX Zone 1 versions?
Yes. ATEX Zone 1 and Zone 2 versions are available. Give us the zone classification and gas group in your inquiry.
Send us your pipe size in DN, fluid type, temperature, pressure, and flow range. We answer technical questions within one working day.