STUF-300F1B: Clamp-on Transit-Time Ultrasonic Flowmeter

High performance and guaranteed lowest price!

Download Brochure STUF-300F1B Download Brochure STUF-300F1C Download Brochure STUF-300F1G
clamp-on ultrasonic flowmeter, liquid flow measurement, digital flow meters
  • Guaranteed lowest price on the market
  • High accuracy:±1% normally;±0.5% when on-site calibration available
  • Wide pipe size range (from 1" to 240")
  • Non-intrusive. No pipe disturbance. No moving parts. No pressure drop.
  • Easy and economical installation. No pipe cutting or hole drilling.
  • Easy to use and set up. Self-explanatory menu programming
  • Velocity, volumetric and totalized flow
  • IP65 weather-proof enclosure
  • 4-20mA output, OCT digital output, relay output, batch control, alarm control
  • Isolated RS485 interface, MODBUS compatible
  • Optional GPRS / GSM networking module
  • No maintenance
  • Low power consumption. Less than 1 W
  • Ideal for both clean and opaque liquid flows
Descriptions :

The STUF-300FxB General Purpose Wall-Mount Clamp-on Ultrasonic Flowmeter is the first member of the 3rd generation ultrasonic flowmeters from Shenitech.  Compared with the predecessors, the 3rd generation ultrasonic flowmeters offer better performances and a richer feature set, all at a lower price.

The STUF-300FxB is designed to be installed at a fixed location for long-term flow measurement from outside of a pipe that carries pure liquids and liquids with minor suspended particles. It utilizes cutting-edge technologies such as advanced transducer design, low voltage transmission, digital signal processing, and self adaptation to achieve high performance.

As QUALITY is of crucial importance, all transducers are carefully paired, and all flowmeters are wet-calibrated in the factory to further ensure system accuracy and reliability.

STUF-300FxB provides versatile input/output interfaces, such as digital and relay outputs, batch control, alarm, flow totalizing, 4-20mA output, and optional RTD interface for thermal energy measurement, which can be easily used by a host computer or a flow controller for process monitoring and control. Besides, the isolated built-in RS-485 port and the optional GPRS/GSM module make remote flow monitoring easy and reliable.

Due to the non-intrusive nature of the clamp-on technology, there is no pressure drop, no moving parts, no leaks, no risk of contamination, no risk of corrosion, no pressure dependency and no blockage on the flow. The installation is very simple and requires no special skills or tools. The cost of installation, operation, and maintenance is lower than that of conventional flowmeters.

STUF-300FxB is an ideal choice for demanding applications where low-cost, high-performance and non-intrusiveness are a must. A pplications include, but are not limited to, liquid process control, water flow measurement (hot/chill water, city water, sea wat beverages, and many other liquids.


Main Unit


Better than ±0.2%


±1% of reading, plus 0.006m/s (0.02ft/s) in velocity

Response Time

0.5s. Configurable between 0.5s and 99s


 -52ft/s - +52 ft/s (-16m/s - +16 m/s), bi-directional.


LCD with backlight.  2 x 20 character display.

Displays instantaneous flow rate, totalized flow rate, velocity, sound speed, time, analog inputs, etc.


English (U.S.) or metric
Current output: 4-20mA isolated output for flowrate, velocity or sound speed. Impedance 0-1k. Accuracy 0.1%

Signal Outputs

Current output: 4-20mA or 0-20mA. Impedance 0-1k. Accuracy 0.1%
Isolated OCT output: can be programmed as pulse output for flow totalizers or frequency output for flow rate
Relay: can be programmed to control alarm, valve or batch process
Sound alarm

Signal Inputs

One channel 4-20mA current input: for signals such as temperature, pressure, liquid level. etc. Accuracy 0.1%. Additional analog input channels are available upon request
Two RTD temperature channels (refer to model STUF-300R1B): to accommodate two PT100 temperature sensors. Thermal energy measurement and calculation functionalities implemented.


Automatically records the following information:1) The totalizer data of the last 64 days / 64 months / 64 years;2) The power time and corresponding flow rate of the last 64 power-on and -off events; 3) Allows for manual or automatic flow loss compensation; 4) The instrument working status of the last 64 days.

Communication Interface

Isolated RS-485. Supports the MODBUS protocol. Optional GPRS / GSM module for networking, remote monitoring and remote control (for model STUF-300FNB only)


Protection Class: IP65 (NEMA 4X) Explosive Proof Class: ExdIIBT4 (for model STUF-300F2B only)


Liquid Types

Virtually all commonly used liquids (full pipe)

Liquid Temp

-40˚F ~ 312˚F (-40˚C ~ 155˚C), depending on transducer type

Suspension concentration

< 20,000ppm. Particle or air bubble size should not exceed 75um


Pipe Size

1" ~ 240"For pipe size of 1" and smaller, the STUF-300FxG flow-cell flowmeter is recommended

Pipe Material

All metals, most plastics, fiber glass, etc. Allows for pipe liner.

Pipe Straight Run

15D or longer preferred, where D is pipe diameter.

If a pump or valve is near upstream, the straight pipe section should be > 30D.


Shielded transducer cable. Standard length 15ft (5m). Can be extended to 1640ft (500m). Contact the manufacturer for longer cable requirement. Cable should not be laid in parallel with high-voltage power lines. Neither should it be close to strong interference sources such as power transformers.



Main unit: 14˚F - 158˚F (-10˚C - 70˚C)
Transducer: -40˚F ~ 212˚F (-40˚C ~ 100˚C) for the standard version; -40˚F ~ 312˚F (-40˚C ~ 155˚C) for the higher temperature version


Main unit: 85% RH

Transducer: water-immersible, water depth less than 10´ (3m)


AC: 90V / 260V, or, DC: 18VDC-36VDC<1 Watt


Standard main unit: 4 lb (2 kg),  Network main unit: 5 lb (2.5 kg)

Transducer Options:

Clamp On Flow Meters

Type HFx

Special transducer for small size pipes DN15 ~ DN25mm (0.5" ~ 1")
Temperature range -20°C ~ 60°C (0°F ~ 140°F)
x represents pipe material: 0-Copper; 1 - Tubing; 2 - ANSI Plastic; 3 - ANSI Metal

Clamp On Flow Meters

Type S1x

Standard-S1 transducer (magnetic) for pipes DN25 ~ DN100mm (1" ~ 4"),
Temperature -40°C ~ 80°C (-40°F ~ 175°F)
x represents pipe material. Same as above
High-temp transducer Type S1HTx
High-temp S1 transducer for pipes DN25 ~ DN100mm (1" ~ 4")
Temperature range -40°C ~ 155°C (-40°F ~ 312°F)
x represents pipe material. Same as above

Digital Flow Meters

Type M1
Standard-M1 transducer (magnetic) for medium size pipes DN50 ~ DN700mm (2" ~ 28")
Temperature -40°C ~ 80°C (-40°F ~ 175°F)

clamp-on transit-time ultrasonic flowmeter

Type M1HT
High-temp M1 transducer for medium size pipes DN50 ~ DN700mm (2" ~ 28")
Temperature range -40°C ~ 155°C (-40°F ~ 312°F)

Clamp on Ultrasonic Flow Meters

Type L1
Standard-L1 transducer for large size pipes DN300 ~ DN6,000mm (11" ~ 240")
Temperature -40°C ~ 80°C (-40°F ~ 175°F)

Clamp on Ultrasonic Flow Meters

Type M1Ex
Intrinsically-safe transducer and IS barrier for medium size pipes, DN50 ~ DN700mm (2" ~ 28")
Class I Div 1, Groups C & D
Temperature range -40°C ~ 85°C (-40°F ~ 185°F)

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