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GE Panametrics Ultrasonic Flow Meters: Transit-Time Systems for Liquid and Gas
Quick Answer: GE Panametrics transit-time ultrasonic flow meters measure liquid and gas flow without cutting pipes or stopping processes. These clamp-on or wetted models handle pipe sizes from DN15 to several meters, pressures up to 345 bar, and temperatures from -190 °C to 600 °C. Silver Instruments supplies and supports the full Panametrics line with local stock in key markets and factory trained engineers.
How Transit-Time Ultrasonic Technology Works in Real Plants
Two piezoelectric transducers send ultrasonic pulses diagonally across the pipe. One pulse travels with the flow, the other against it. The difference in transit time is directly proportional to flow velocity. No moving parts touch the fluid. No pressure drop occurs. This is the core of all GE Panametrics meters.
Most engineers skip this part but here is why it matters. For liquids with low solids content (< 3% by volume), clamp-on transducers mount outside the pipe wall. For high solids, dirty liquids, or gas applications, wetted transducers insert into the flow stream. GE offers both configurations under the same electronics platform. A water plant in Indonesia runs 12 clamp-on units on raw water lines for 6 years without recalibration. A gas distribution company in Thailand measures flare gas from 0.1 m/s to 120 m/s with wetted transducers at 60 bar.
Models We Deploy Most Often
The PT878 portable flow meter is a handheld unit engineers bring to site surveys. It stores 100,000 data points. The LCD shows flow rate, totalized volume, and velocity. Pipe wall thickness gauge is built in. We rent this unit to customers in Vietnam who need temporary measurements on chilled water circuits before buying permanent meters.
The AT868 clamp-on liquid flow meter works on metal and plastic pipes from DN15 to DN3000. Accuracy is ±0.3% of reading in optimal conditions. Outputs include 4-20 mA HART, Modbus RTU, and BACnet. This model goes into HVAC energy management and seawater intake lines. One desalination plant in Saudi Arabia uses 24 AT868 meters on brine and permeate lines, all connected to DCS via HART.
The CTF878 clamp-on steam and gas flow meter targets saturated steam, air, natural gas, and biogas. It handles pipe sizes DN25 to DN4000. Accuracy is ±1% of reading for velocity above 1.5 m/s. The latest firmware corrects for pipe wall thickness dynamically. A food and beverage factory in Indonesia meters saturated steam to jacketed kettles with CTF878 units. They saw a 5% drop in boiler gas consumption after flow data exposed steam leaks.
The DF868 and XMT868i liquid flow meters are the fixed installation workhorses. The DF868 uses Doppler backup when signal quality is poor. The XMT868i is a compact transmitter with integrated transducer assemblies. Both handle aggressive chemicals, acids, and solvents. A chemical plant in Colombia measures 98% sulfuric acid at 80 °C through PTFE lined pipes using XMT868i meters with perfluoroalkoxy transducers. No metallic wetted parts. No corrosion.
What Makes Panametrics Stand Out Against Competitors
GE builds the transducer, the cable, the preamplifier, and the transmitter as one matched system. This is not a mix and match setup. The signal strength is measured in RSSI (Received Signal Strength Indicator) at the factory. If you replace a transducer with a non-OEM part, the RSSI drops and the meter may fault. We have seen this on customer sites many times. A plant in Australia swapped cables with generic RG-58. The meter lost signal every time the pump started. The fix was a genuine GE shielded cable set.
Temperature extremes are handled with specific transducer materials. Standard units cover -40 °C to 150 °C. With PEEK or Hastelloy housings, you can go to 600 °C for flare gas applications. Cryogenic models for LNG run at -190 °C. The coupling compounds also change. For -190 °C, GE supplies a special indium based couplant that stays plastic at low temperature. For 345 bar, the wetted transducers use 316L stainless steel bodies
Integration With Plant Systems
Outputs are not just 4-20 mA. All Panametrics meters have a built-in web server. You open a browser, type the iP address, and see the live flow profile. No special software. One meter stores up to 8 GB of logged data on a microSD card. File format is CSV. Modbus TCP, EtherNet/IP, and PROFIBUS DP are optional. A mining operation in Chile uses EtherNet/IP to pull flow data from six XMT868i meters into a Rockwell ControlLogix system every 100 ms.
Power over Ethernet (PoE) and 24 VDC options eliminate the need for a power outlet at the meter location. This is useful in remote skid mounted analyzer shelters. The meter power consumption is under 8 W. You can run it from a small solar panel and a 12 V battery. We have supplied solar powered AT868 systems to wellheads in Oman where AC power does not exist.
Real World Installation Advice
Always measure pipe wall thickness with a gauge. Do not trust the pipe schedule stamped on the outside. A 20 year old pipe may have 2 mm of internal scale. This changes the acoustic path length and throws off flow readings by 3% to 8%. Use the built-in thickness gauge of the PT878 or a separate DMS Go+ unit. One customer in Malaysia was reading 12% low on crude oil because they assumed wall thickness was 10 mm. Actual thickness was 7.4 mm after scraping scale. That misreading cost them US$200,000 in custody transfer billing error over six months.
For gas meters, upstream straight pipe is critical. GE recommends 20D upstream and 10D downstream for custody transfer accuracy. If you have a control valve within 10D, install a flow straightener. The GE flow conditioner plate works well. In practice, many plants ignore this. Then they ask why the flow reading fluctuates by 5%. The answer is turbulence from an elbow 6D away. We help customers do site walkdowns via WhatsApp video call. Send us a phone scan of the pipe routing near the measurement point.
FAQ
Can I use clamp-on transducers for custody transfer of crude oil?
Yes. The AT868 with high-precision clamp-on transducers meets API MPMS Chapter 5.8 requirements. You need a temperature transmitter (PT100) for density correction. Silver Instruments can supply a complete system with a flow computer for US$12,000 to US$25,000 depending on pipe size and certification.
What is the minimum pressure for gas flow meters?
Panametrics gas meters need at least 5 bar absolute pressure for reliable signal transmission. Below 5 bar, the acoustic impedance of the gas is too low. For low-pressure biogas, use the CTF878 with wetted transducers and a pressure boosting pump if necessary.
Do these meters work on concrete or fiberglass pipes?
Clamp-on ultrasonic meters do not work on concrete, fiberglass, or uncoated ductile iron pipes. The acoustic signal scatters too much. For these pipes, use an insertion type magnetic flow meter or a vortex meter. We can advise based on your pipe material.
How often do Panametrics meters need calibration?
Factory calibration is valid for 10 years in normal service. No moving parts wear out. We recommend an annual verification with a portable PT878 meter. If the difference is under 1%, you are fine. Silver Instruments offers on-site verification in Southeast Asia and the Middle East.
Can you supply a Panametrics meter with hazardous area certification?
Yes. All fixed transmitters are available with ATEX Zone 1 / IECEx Ex d certification. The transducers have intrinsic safety Ex ia ratings for Zone 0 when used with suitable barriers. Provide your gas group and temperature class, and we will configure the certified part numbers.
Ready to Select a Meter?
Send us your pipe size (DN), fluid type, pressure (bar), temperature (°C), and required outputs. Our engineers will propose a Panametrics model and a commercial offer within 24 hours.
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Tel: +86-25-68650347
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Visit flow-meter.com.au for datasheets and installation guides.