Portable Ultrasonic Flow Meter with Built-In Printer | FMU835
The FMU835 is an advanced portable transit-time ultrasonic flow meter designed specifically for formal field auditing, commissioning, and verification where immediate hard-copy documentation is required. Featuring an integrated 24-column thermal printer, an external 2GB SD card logger, support for PT100 temperature sensors (heat energy measurement), and an extended 20+ hour battery life, the FMU835 delivers complete, non-invasive flow and thermal energy audits without interrupting pipeline operation.
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Instant Physical Printing: Integrated thermal printer generates real-time or timed hard-copy measurement receipts on-site.
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Thermal Energy Auditing: Optional PT100 temperature sensors enable precise BTU/heat quantity calculation.
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Extended Field Operation: Built-in Ni-MH battery pack supports over 20 hours of continuous field use.
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Expanded Data Storage: 2GB SD card expansion for multi-parameter logging, tabulation, and trend curve analysis.
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Versatile Pipe Range: Non-invasive clamp-on sensors cover pipe diameters from DN15 to DN6000.
Description
Formal Field Audits & On-Site Documentation
The FMU835 is built for environmental inspectors, commissioning engineers, and municipal water auditors who require verifiable, immediate field evidence. Unlike standard handheld meters designed solely for spot-checking, the FMU835 includes an on-board 24-column thermal printer. Technical personnel can print instantaneous flow rates, totalized volumes, and signal status reports directly at the test location, providing instant physical receipts for clients or compliance records.
Thermal Energy & Process Measurement
Beyond standard liquid velocity measurement, the FMU835 features 3-way 4-20mA signal inputs capable of acquiring temperature, pressure, and level data. By connecting optional PT100 temperature transducers (available in clamp-on or insertion styles), the unit transforms into a complete thermal heat energy meter. It calculates real-time heat loss, thermal efficiency, and BTU consumption across HVAC systems, boiler loops, and industrial heat exchangers.
Long-Term Logging & Heavy-Duty Design
Equipped with an external 2GB SD card slot, the FMU835 easily stores extensive historical datasets, facilitating detailed statistical analysis, tabulations, and flow curve generation via dedicated PC analysis software. Housed in a flame-retardant ABS case and supplied in a high-strength, impact-resistant carrying case, the unit is powered by 8 internal Ni-MH batteries supplying over 20 hours of continuous field operation.
Features
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Built-in Thermal Printer: 24-column thermal receipt printer generates immediate and scheduled hard-copy printouts of over 20 pre-set measurement parameters.
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Thermal Energy (BTU) Measurement: Connects with clamp-on or insertion PT100 RTD sensors to measure heating/cooling energy consumption.
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2GB SD Card Data Logging: Long-term data storage capabilities supporting automated statistics, reporting, and graph generation on PC software.
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20+ Hour Continuous Battery Life: High-capacity internal Ni-MH battery pack (8 x 1.2V) ensures round-the-clock uninterrupted field testing.
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Non-Invasive Clamp-On Design: Zero pipe cutting, zero system downtime, and zero pressure drops across lines from DN15 to DN6000.
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Multi-Language User Interface: 2×20 character backlit LCD display supports English, Italian, and Chinese menu navigation.
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Complete Audit Utility Suite: Shipped in a rugged, dustproof carrying case complete with transducer rails, couplant, tape measure, and mounting chains.
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Flexible I/O & Bus Support: Includes 4-20mA current output, OCT pulse, relay output, 3-way 4-20mA inputs, and RS485 (MODBUS) communication.
Specification
| Parameter | Specification |
| Measurement Principle |
Transit-time ultrasonic flow measurement |
| Accuracy Class |
Class 1 (±1% of indication value) |
| Flow Velocity Range |
0 to ±10 m/s |
| Pipe Diameter Range |
DN15 mm to DN6000 mm |
| Display |
2×20 character backlit LCD (English, Italian, Chinese) |
| Integrated Printer |
24-column thermal printer (prints over 20 pre-set measurement parameters) |
| Data Storage |
Integrated printer + External 2GB SD card logger |
| Thermal Energy Input |
3-way 4-20mA input (0.1% accuracy); supports PT100 temperature sensors |
| Signal Outputs |
1-way 4-20mA (0-1kΩ, 0.1% acc.), 1-way OCT pulse (6-1000ms), 1-way Relay |
| Digital Interface |
Isolated RS485 serial interface, MODBUS protocol support |
| Applicable Pipe Materials |
Carbon steel, stainless steel, cast iron, copper, PVC, aluminum, fiberglass, cement, etc. (Liners permitted) |
| Applicable Media |
Water, sea water, sewage, acid/alkali liquids, alcohol, beer, oils (<10,000 ppm turbidity) |
| Medium Temperature Range |
Standard: -30°C to 90°C / High-Temperature: -30°C to 160°C |
| Power Supply |
8 built-in 1.2V Ni-MH batteries (>20 operating hours) / 90V–260V AC adapter |
| Power Consumption |
1.5 W |
| Ingress Protection |
Convertor: ABS casing / Transducers: IP67 or IP68 |
| Environmental Limits |
Convertor: -20°C to 60°C (85% RH) / Flow Transducers: -30°C to 160°C |
FAQ
What makes the Sentec FMU835 different from standard handheld flow meters?
While handheld meters (like the FMU830) are engineered for rapid handheld diagnostics, the FMU835 is a complete portable audit workstation. It features a built-in thermal printer for printing physical receipts on-site, an expanded 2GB SD card logger, a larger battery pack (20+ hours runtime), and native support for PT100 heat measurement.
What information can be printed on the built-in thermal printer?
The 24-column thermal printer can generate real-time or interval-scheduled hard copies of over 20 pre-set parameters, including instantaneous flow rates, totalized positive/negative/net flow volumes, date/time stamps, signal quality ratings, and temperature differential values.
How does the FMU835 measure heat/thermal energy?
The converter includes 3-way 4-20mA inputs specifically designed to acquire external signals. By plugging in a pair of optional PT100 temperature sensors (clamp-on or insertion type) on the supply and return lines, the unit calculates thermal energy consumption (BTU/heat quantity) alongside liquid flow.
Can the data stored on the SD card be analyzed on a PC?
Yes. The 2GB SD card records long-term measurement data that can be exported directly into Sentec’s PC software. The software enables statistical analysis, data tabulation, custom report generation, and graphic flow curve plotting.
Does installing the transducers require interrupting the process?
No. The FMU835 utilizes non-contact, external clamp-on or bracket-mounted transducers. Sensors clamp directly onto the exterior wall of the pipe, eliminating the need to cut pipes or shut down facility operations.
