GE DigitalFlow XMT868I‑1‑21‑OI‑0312‑0 Ultrasonic Flow Meter
Product Description
GE DigitalFlow XMT868I‑1‑21‑OI‑0312‑0, part of the Panametrics DigitalFlow series liquid ultrasonic flow transmitters, adopts patented Correlation Transit‑Time™ technology. It supports two measurement modes: clamp-on and wetted insertion sensors, suitable for hazardous explosive environments and can be installed directly at measurement points. Equipped with an on-board microprocessor, XMT868I‑1‑21‑OI‑0312‑0 automatically adapts to changes in fluid media. It offers single-channel basic measurement and can be upgraded to dual-channel for dual-pipe or dual-path measurement. It is widely applied in liquid flow monitoring for process industries including petrochemical, chemical, water treatment and oil & gas. The unit has no moving parts, brings no pipeline pressure loss, supports multiple communication protocols, displays parameters locally and connects to remote DCS control systems, meeting the demands of on-site commissioning and upper computer data acquisition.
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Product Parameters and Physical Specifications
- Performance Parameters
| Measurement Principle | Patented Correlation Transit‑Time™ |
| Flow Velocity Range | ‑12.2~12.2 m/s, bidirectional measurement |
| Turndown Ratio | 400:1 |
| Pipe Diameter Range | 12.7 mm‑7620 mm, max pipe wall thickness 76.2 mm |
| Repeatability | ±0.1%‑0.3% of reading |
| Clamp-on Accuracy | For pipe diameter＞150 mm: ±1‑2% of reading; For pipe diameter＜150 mm: ±2‑5% of reading; up to ±0.5% of reading after process calibration |
| Measurable Media | Various hydrocarbon liquids, crude oil, lubricating oil, diesel oil, solvents, cold & hot water, sewage, chemical fluids, LNG and other liquid media |
- Electrical Parameters
| Channel Configuration | XMT868I‑1‑21‑OI‑0312‑0 standard single channel, dual-channel upgrade optional |
| Power Supply | Standard 100‑240 VAC ±10%; optional 12‑28 VDC ±5% |
| Max Power Consumption | 20 W |
| Local Display | 2-line ×16-character backlit LCD, cycles up to 4 measurement parameters |
| Operation Keypad | Built-in infrared 6-key magnetic keypad; no power-off required for cover opening, safe operation in explosion-proof areas |
| Standard I/O | 2 isolated 0/4‑20 mA outputs; 2 isolated 4‑20 mA inputs |
| Optional I/O | Frequency output, RTD temperature input, alarm relay |
| Digital Interface | Standard RS232; optional HART7, Modbus RS485/TCP‑IP, Ethernet, FF Fieldbus, Namur NE107 |
| Supporting Software | PanaView™ PC software for parameter configuration, diagnosis and data logging |
- Enclosure Physical Specifications
| Enclosure Material | Epoxy coated aluminum; stainless steel enclosure optional |
| Protection Class | Type4X / IP66 |
| Explosion Proof Certification | Class I Division1, Ex d IIC T6 Gb, ATEX II2G, IECEx |
| Overall Dimension | 208 mm ×168 mm (Height × Diameter) |
| Unit Weight | 4.5 kg |
| Operating Temperature | ‑40℃~60℃ |
| Storage Temperature | ‑55℃~75℃ |
| Max Sensor Cable Length | 330 m |
Product Advantages
- First, XMT868I‑1‑21‑OI‑0312‑0 supports non-intrusive clamp-on measurement. No pipe cutting or shutdown required for installation and commissioning without damaging process pipelines.
- Second, there are no internal moving components, so blockage and wear will not occur, with zero pipeline pressure loss, low long-term drift and little on-site maintenance work.
- Third, it is compatible with clamp-on and wetted insertion sensors. The same XMT868I‑1‑21‑OI‑0312‑0 can switch sensor solutions according to working conditions, adapting to complex pipelines ranging from small to large diameters.
- Fourth, complete explosion-proof hardware certifications allow direct installation in hazardous areas of petrochemical and chemical industries without additional isolation cabinets.
- Fifth, the patented ATW Automatic Tracking Window algorithm maintains stable measurement under working conditions with fluctuating medium properties and small amounts of bubbles or solid particles.
- Sixth, abundant optional communication interfaces seamlessly connect with PLC and DCS host systems. PanaView software simplifies fault diagnosis and data archiving.
- Seventh, dual-channel expandability. After upgrading to dual-channel, one XMT868I‑1‑21‑OI‑0312‑0 can monitor two independent pipelines simultaneously or compensate flow field errors via dual-path on a single pipe, reducing instrument procurement cost for projects.
Product Features
- Full digital signal processing, correlation transit time detection algorithm, automatically tracking fluid sound velocity and adapting to medium condition fluctuations.
- Infrared magnetic control keypad. Parameter setting and diagnosis checking can be completed with enclosure sealed, ensuring safe operation in explosion-proof zones.
- Supports bidirectional flow measurement; forward flow, reverse flow and totalized flow can be calculated simultaneously.
- Optional on-board data logging, storing up to 150,000 measurement data groups for process traceability.
- Compact enclosure structure, small size and light weight, installed near measurement points to shorten wiring distance.
- Applicable to pipes of multiple materials including carbon steel, stainless steel, FRP and plastic-lined pipes.
- Modular design with various option cards. I/O, communication and data logging functions can be upgraded on site without replacing the XMT868I‑1‑21‑OI‑0312‑0 main hardware unit.
- Comprehensive instrument self-diagnosis. Real-time alarm for signal strength and sensor status to quickly locate on-site faults.
Application Scenarios
- Petrochemical Refining: Flow metering for crude oil pipelines, refined oil and lubricating oil transmission pipelines, material balance accounting for units.
- Oil & Gas Industry: Flow monitoring for LNG liquid media and condensate pipelines.
- Chemical & Pharmaceutical: Flow monitoring for various solvents, chemical process liquids and process water.
- HVAC & Thermal Energy: Energy metering for chilled water and high-temperature hot water, cold & heat quantity statistics.
- Water Treatment Industry: Flow detection for municipal water supply, sewage and circulating water pipelines.
- Power Energy Plant: Flow monitoring for process cooling water and fuel oil transmission pipelines.
- Food & Beverage: Non-contact liquid flow measurement to avoid medium contamination risks.
Same Brand Product Comparison
| Model | Core Positioning | Measuring Medium | Key Differences |
| XMT868I‑1‑21‑OI‑0312‑0 | General liquid ultrasonic transmitter | Liquid | Single-channel main unit, supports clamp-on / wetted sensors, explosion-proof, modular I/O expansion, balancing cost and performance |
| DF868 | High-end liquid ultrasonic flow meter | Liquid | Higher performance grade, native dual channel, complex flow field compensation, optimized for energy metering |
| XGF868i | Flare gas ultrasonic mass flow meter | Gas (flare, vent gas) | Designed for gas, molecular weight calculation, NHV calorific value measurement, wetted insertion sensor, not for liquid measurement |
| XGM868i | General gas ultrasonic transmitter | Process gas | Gas transit time measurement, incompatible with liquid media |
| AquaTrans AT868 | Economical ultrasonic flow meter dedicated to water | Water | Simplified version with streamlined functions, only for water industry scenarios, not suitable for chemical hydrocarbon media |
Matching Accessories
- XDC series clamp-on ultrasonic sensors, compatible with XMT868I‑1‑21‑OI‑0312‑0, different sensor models corresponding to various pipe diameters.
- WMT wetted insertion sensors for high-precision liquid measurement under high temperature and high pressure conditions.
- XAMP pre-amplifier for long-distance sensor cable transmission and improved signal anti-interference performance.
- PanaView PC software, model 910‑171SW, for configuration, diagnosis and data logging of XMT868I‑1‑21‑OI‑0312‑0.
- Sensor mounting fixtures: chain clamps, steel belt clamps, special guide clamps for small diameter pipes.
- RG62 A/U coaxial signal cable, standard sensor cable; armored flame-retardant cable optional.
- I/O expansion option cards: analog input & output card, Modbus TCP communication card, data logging card.
FAQ
Q: Can XMT868I‑1‑21‑OI‑0312‑0 directly measure liquid containing bubbles?
A: Measurement is available with a small amount of bubbles. Excessively high bubble content will attenuate ultrasonic signals and lead to measurement errors. For high bubble fraction, wetted insertion sensors are recommended or other measurement solutions need to be evaluated.
Q: Can XMT868I‑1‑21‑OI‑0312‑0 be directly used for flare gas measurement?
A: No. XMT868I‑1‑21‑OI‑0312‑0 is a liquid-dedicated transmitter. XGF868i model of the same series is required for flare gas measurement.
Q: Does the standard package of XMT868I‑1‑21‑OI‑0312‑0 include sensors and fixtures?
A: The order item only includes transmitter main unit. Sensors, fixtures and signal cables are independent optional accessories and need separate ordering.
Q: Does pipe shutdown need to be performed for clamp-on installation of XMT868I‑1‑21‑OI‑0312‑0?
A: No pipe cutting is required for clamp-on solution, on-line installation under pressure without unit shutdown. For wetted insertion sensors, evaluate whether the pipeline permits hot tapping.
Q: Can the explosion-proof version of XMT868I‑1‑21‑OI‑0312‑0 be installed in Zone1 hazardous area?
A: The Ex d IIC T6 explosion-proof model supports Zone1 / Class I Division1 hazardous areas. Confirm explosion-proof code option during ordering.
Q: What is the minimum measurable pipe diameter of XMT868I‑1‑21‑OI‑0312‑0?
A: Minimum supporting pipe diameter is 12.7 mm. Small diameter measurement must match corresponding small-size clamp-on sensors and special fixtures.
Q: Can single channel of XMT868I‑1‑21‑OI‑0312‑0 be upgraded to dual channel in later stage?
A: The hardware supports dual-channel upgrade by adding channel option board with supplementary matching sensors and cables. Verify hardware version of ordered model.
Q: What communication option needs to be purchased if XMT868I‑1‑21‑OI‑0312‑0 connects directly to DCS?
A: Standard output can be used for 4‑20mA analog signals. Corresponding communication option cards are required for digital Modbus RTU/TCP, HART and FF bus.
Notes
- For clamp-on measurement of XMT868I‑1‑21‑OI‑0312‑0, pipe wall scaling and thick anti-corrosion lining will attenuate ultrasonic signals and reduce measurement accuracy. Confirm lining material and thickness of pipe wall before installation.
- Couplant for clamp-on sensors requires regular maintenance. Couplant aging cycle shortens under high temperature conditions. Clean pipe wall and sensor contact surface periodically.
- Straight pipe section requirements must be met. Without CFD flow field correction parameters: 10D upstream, 5D downstream. After importing CFD correction parameters, it can be reduced to 5D upstream and 2D downstream.
- Installation and wiring of explosion-proof unit must strictly comply with explosion-proof specifications. Do not damage enclosure sealing threads; power off before cover opening for maintenance.
- RG62 A/U coaxial cable is used for sensor wiring. Do not replace with ordinary cables; total cable length cannot exceed 330 m.
- Provide full part number XMT868I‑1‑21‑OI‑0312‑0 during ordering, confirm channel, explosion-proof, power supply, I/O and communication options to avoid mismatched accessories.
- The measured medium temperature cannot exceed temperature limit of selected sensors. Ambient temperature of transmitter main unit shall be kept between ‑40~60℃.
Product Tags
DigitalFlow XMT868I‑1‑21‑OI‑0312‑0,ultrasonic flow transmitter,clamp‑on ultrasonic flow meter,liquid ultrasonic flow meter,Panametrics XMT868i,GE Sensing flow meter,process ultrasonic flowmeter,hazardous area flow measurement
Why Choose GE XMT868I‑1‑21‑OI‑0312‑0?
GE XMT868I‑1‑21‑OI‑0312‑0 adopts mature Panametrics Correlation Transit-Time measurement technology, supporting both non-intrusive clamp-on installation and high-precision wetted insertion schemes. One single instrument adapts to liquid media of multiple industries. Complete explosion-proof certifications allow deployment in hazardous sites of petrochemical and chemical sectors. Modular hardware supports on-site upgrades of I/O, communication and dual-channel functions. With no moving parts and zero pressure loss, it delivers low operation & maintenance cost. Combined with PanaView software for complete commissioning, diagnosis and data archiving, it satisfies industrial project measurement requirements including process metering, material balance and energy monitoring.
