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Acoustic Doppler Flow Meter: Non-invasive Particle and Slurry Pipe Testers
Quick Answer: An acoustic Doppler flow meter measures flow from outside the pipe. It works on slurry, wastewater with solids, dredging lines, and any flow with particles or gas bubbles above 100 ppm. Silver Automation Instruments supplies the ADM-100 series with non-invasive clamp-on sensors for DN25 to DN3000 pipes.
Where a Doppler Meter Works Best
Doppler flow meters need particles or bubbles to reflect the ultrasonic signal. Clean water with no solids gives a weak return. Most engineers skip this part, but the minimum solid concentration matters. We recommend at least 200 ppm of suspended solids or small gas bubbles above 100 micron. A pipe full of paper pulp, sludge, dredge sand, or lime slurry returns a strong signal.
Because the sensor clamps on the outside of the pipe, no process contact exists. That means no wear from abrasive slurry. That design is the main reason mining and dredging teams in Australia and Southeast Asia choose the ADM-100 over inline magnetic flow meters for short-term or retrofit jobs.
Non-invasive Installation Cuts Downtime and Cost
You clamp the sensor onto a pipe without cutting the line. No welding and no flange work are needed. The line stays in service. A paint manufacturer in Vietnam needed flow data on a 300 mm PVC slurry line. The line ran almost 24 hours a day. We supplied two ADM-100 non-invasive acoustic Doppler flow meters with clamp-on brackets. The customer installed both in one afternoon and sent data to the control room via 4-20 mA HART.
Here is the thing. The pipe wall must be rigid. Carbon steel, stainless steel, PVC, HDPE, and concrete pipes work if the pipe is full and the wall is clean. Do not use on lined pipes with air gaps or loose rubber liners. The sensor bond needs a coupling gel or solid acoustic pad. In practice, a clean pipe surface gives better repeatability than a perfect flow profile.
Key Parameters for Specifying a Slurry Flow Meter
For a slurry line, send us the pipe size in DN, pipe material, solids type, solids content in percent by weight, flow range in m3/h, and line pressure in bar. A typical ADM-100 covers flow velocity from 0.02 m/s to 12 m/s. Accuracy is plus or minus 1.0 percent of reading from 0.3 m/s to 8 m/s with stable slurry. Temperature range is -20 °C to 80 °C for the transducer. The transmitter accepts 24 V DC or 85 to 265 V AC. Outputs include 4-20 mA HART, pulse, and RS485 Modbus RTU. Enclosure protection is IP66 for the transmitter and IP68 for the sensor.<
We have seen many customer sites use a Doppler meter only as a totalizer. That is fine. The ADM-100 accumulates forward flow, reverse flow, and net total. If you need batch control, the relay output can trigger a valve or a pump.
Industries and Real Applications
Wastewater plants in the Middle East use the ADM-100 on raw sewage lift stations and return activated sludge lines. Dredging contractors in the Philippines clamp the ADM-100 on discharge pipes to measure sand and water mixture. A fishmeal plant in New Zealand measures process water with high fat solids. Food and beverage plants in Mexico use the ADM-100 on waste streams with fruit pulp. The meter works on any full pipe where particles or bubbles are present. On many sites, the ADM-100 serves as a non-invasive particle and slurry pipe tester for short-term flow surveys.
For clean liquids, an inline electromagnetic flow meter or a Coriolis mass flow meter is usually a better fit. But for slurry, sludge, and particle pipe testing, the acoustic Doppler flow meter is the fastest non-invasive option we offer.
Contact and Quick Quote
Need a price? Send Silver Automation Instruments your pipe size in DN, pipe material, solids type, solids content in percent, flow range in m3/h, line pressure in bar, and output type. We respond with a specific model, sensor kit, and lead time. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. You can also check the full range at flow-meter.com.au.
FAQ
Can an acoustic Doppler flow meter measure clean water?
No. Clean water with no particles or bubbles will not reflect enough signal. Use an electromagnetic flow meter or ultrasonic transit-time flow meter for clean liquids.
What pipe sizes can the non-invasive sensor fit?
The ADM-100 clamp-on sensors cover DN25 to DN3000. We ask for the exact outside diameter in mm when you send an inquiry.
Does the sensor wear out on abrasive slurry?
No. The sensor is outside the pipe. The slurry does not contact the sensor. Only the pipe wall handles the abrasion.
Can the meter be installed on a vertical pipe?
Yes. Install on a rising vertical section with upward flow. The pipe must be full at the sensor location.
How do I get a quote for a slurry flow meter?
Send your pipe size, solids type, solids content, flow range, pressure, and temperature to Silver Automation Instruments. Use Tel: +86-135-1213-1526 or WhatsApp: 86-135-12131526.
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