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Clamp On Ultrasonic Gas Flow Meter with High-Frequency Multi-Phase Stack Probes
Quick Answer: Silver Automation Instruments supplies a clamp-on ultrasonic gas flow meter with high-frequency multi-phase stack probes.
It measures gas flow in pipes from DN50 to DN1200 without cutting the line.
The meter tolerates wet gas, flare gas, and up to 5% liquid volume fraction under normal operating pressure.
What Makes High-Frequency Multi-Phase Stack Probes Different
Most clamp-on gas meters fail when liquid droplets scatter the ultrasonic signal.
Our stack probes combine multiple transducer layers that fire high-frequency pulses from 200 kHz to 500 kHz.
The layered design focuses a narrow acoustic beam.
This beam penetrates mist and thin liquid films on the pipe wall.
In practice, a single-path meter can lose signal in seconds when wet gas appears.
The stack probe keeps the signal stable because each layer supports the others.
Here is the thing: the probes also compensate for pipe wall thickness changes that happen with temperature swings.
Performance in Wet Gas and Flare Gas Applications
A petrochemical plant in the Middle East used a clamp-on stack probe meter on a DN300 flare line with 2% hydrocarbon mist.
The meter delivered consistent volumetric flow data during start-up and emergency venting.
Engineers at the site confirmed the flow readings matched their process mass balance within 1.5%.
Because the probes mount outside the pipe, no hot work was needed.
This saved 3 days of shutdown and safety paperwork.
Another biogas plant in Thailand used the same probe style on a DN150 stainless pipe carrying raw biogas at 60 °C.
Moisture content reached 4% volume.
The meter kept measuring while an inline vortex meter plugged with solids.
These examples show why multi-phase stack probes are becoming a standard choice for dirty gas service.
Key Specifications at a Glance
Pipe sizes: DN50 to DN1200 (2 inch to 48 inch), wall thickness up to 50 mm.
Pipe materials include carbon steel, stainless steel, duplex, and PVC.
Gas types: natural gas, nitrogen, oxygen, flare gas, biogas, compressed air, and CO2.
Flow velocity 0.1 m/s to 60 m/s.
Accuracy for single-path: ±1% of reading; for dual-path or multi-path stack: ±0.5% of reading with factory calibration.
Repeatability 0.2%.
Output signals: 4-20 mA HART, Modbus RTU, pulse, and local LCD with keypad.
Power: 24 V DC or 100-240 V AC.
Hazardous area approvals: ATEX Zone 1 and Zone 2, IECEx, enclosure IP66.
Proce
Typical Installation Notes
You need a straight run of 10D upstream and 5D downstream.
The pipe surface must be clean, no loose rust or paint.
Our team can perform a site survey remotely if you send photos.
The probe is held by stainless steel straps.
No orifice plates, no flanges.
A standard installation takes 2 hours for a single path.
Because the meter is non-intrusive, it works well in ATEX Zone 1 areas without special permits for hot work.
Most plants complete the installation with their own maintenance crew.
We provide assembly drawings and a 30-minute video call for support.
How to Request a Quote
Send your process data: gas composition, pressure in bar, temperature in °C, pipe outside diameter and wall thickness, material, and required flow range in Nm3/h or kg/h.
We will select the probe configuration and meter electronics and return a proposal within 24 hours.
Contact us directly.
Tel: +86-25-68650347.
Whatsapp: +86-25-52155837.
WeChat: +86 15365082610.
You can also see clamp-on gas meter models on flow-meter.com.au.
Frequently Asked Questions About Clamp-On Ultrasonic Gas Flow Meter Probes
1. What pipe coatings can the meter penetrate?
Thin epoxy, bitumen, and cement lining up to 3 mm thick are usually fine.
For thicker coatings, we can test a pipe sample in our lab before quotation.
2. Can the stack probe handle high-pressure gas transmission?
Yes. Pipe pressure does not affect the ultrasonic signal because the probes are entirely external.
We have installations on gas pipelines operating at 100 bar without any probe modification.
3. How do you deal with background noise from valves?
The meter includes digital signal processing that filters mechanical noise.
Stack probes also have higher signal amplitude, which improves the signal-to-noise ratio.
In extremely noisy stations, we add acoustic isolation to the probe housing.
4. Is the meter suitable for oxygen service?
We offer degreased probe pads and non-silicone couplant for oxygen service.
Confirm the oxygen pressure and concentration when you inquire, and we will specify the proper cleaning procedure.
5. What about long-term drift and maintenance?
There are no wetted parts, so drift is normally less than 0.1% per year.
We recommend a zero-flow verification every 12 months.
You can do this by isolating the line and running a zero check from the display menu.