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Transit time: Portable Ultrasonic flowmeter

Dynasonics TFXP Portable Transit Time Flow Meters feature the world’s most advanced non-invasive flow measurement technology providing a measuring system with unsurpassed accuracy, versatility, ease of installation and dependability. Although designed primarily for cleaner liquids, the flow meter can reliably measure liquids containing moderate amounts of suspended solids or aeration.

TFXP is designed for long- or short-term flow measurement surveys on full-pipe liquid systems and is ideal for verifying calibration of permanently mounted flow meters of all types. The flow meter features a tactile keypad, 24-hour battery (rechargeable), removable 200,000-event data logger (optional) and a 128 x 64 pixel, backlit graphics display all integrated into a rugged, watertight enclosure.

TFXP systems utilize Dynasonics proprietary dual time-base time expansion algorithm, advanced DSP and digital cross-correlation. TFXP also provides an optical interface that allows operation of the Windows® ULTRALINK software utility. The software utility allows simple in-field programming, calibration and software upgrades. The cost-effective and versatile TFXP flow meter comes complete with all accessories necessary for measuring piping systems 2" [50 mm] and higher

Technical Specs

This model has been replaced by Hybrid: Portable Ultrasonic Flowmeter

Model TFXP
Power Requirements Internal 12 V lead-acid Gel Cell battery provides 24 hrs. of continuous operation @ 20 °C. Charging: Wall mount power converter. 115 or 230 VAC 50/60 Hz ±15% @ 5 VA max.; 12-15 VDC @ 2.5 VA max.
Velocity -40 to +40 FPS [-12 to +12 MPS]
Inputs/Outputs All output modules are optically isolated from earth and system grounds.
A maximum of two modules may be installed.

Standard Options:
4-20 mA 800 Ohms max.; 12-bit resolution; passive or active
Data Logger 200,000 event, 16-bit, integral DB-9 RS232C connection, can be removed and installed without disconnecting system power, data transfer rates to 57.6K.

Other Options:
Pulse Output MOFSET, 0.21 Ohms, 100 V max., 0-2,500 Hz
Relay Two separate Form C relays, 200 VAC max. @ 0.5 A resistive
RS232C data rate to 57.6K
RS485 supports up to 119 drops
Ambient Conditions -40 to +85ºC, 0-95% relative humidity, non-condensing
Enclosure NEMA 4X [IP-66] while open, NEMA 6 [IP-68] while closed, ABS with SS hardware. Electronic enclosure: 14.00W x 6.06H x 10.56D inches [355.6H x 153.9W x 268.2D mm]; 14.8 lbs. [6.7 Kg]s
Accuracy Flow Rate ±0.5% of reading at rates > 1 FPS for field calibrated systems
±1% of reading at rates > 1 FPS [0.3 MPS] uncalibrated
±0.1 FPS [0.003 MPS] at rates < 1 FPS [0.3 MPS]
Response Time Flow: 0.3-30 seconds, user configured, to 100% of value, step change in flow
ULTRALINK Utility IBM compatible, Windows® 95/98/2000/XP operating system
Liquid Types Supported Virtually all non-aerated liquids.
Transducer to Transmitter Distance (Std.) 20 Feet [6.09 meters], (Opt.) lengths to 990 feet [300 meters]
Pipe Sizes (Std.) 2 inches [50 mm] and higher
Environment NEMA 6
Pipe Surface Temperature DTTN: -40 to +121ºC
DTTH: -40 to +200ºC
Ambient Temperature -40 to +85ºC, 0-95% relative humidity, non-condensing
Housing Material DTTN: CPVC, Ultem and Nylon
DTTH: PTFE, Vespel, Nickel-Plated Brass

Data sheet

CatalogueProduct Selection Form

See also
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Air: Ultrasonic Flowmeter for small flow
Aichi Tokei Ultrasonic Gas Flowmeter

•Robust against oilmist and dust
•Turndown ratio 50:1
•Ultrasonic sensor is integrated
•Negligible pressure drop (equivalent to straight pipe)


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