TTFM 6.1 Transit Time Flow Meter
  • Multiple data points such as flow rate, flow total, diagnostic information etc.
  • Built-in 5-button keypad
  • Backlit LCD Display
  • Password Protected
  • Allowable temporary period of submersion up to 10 psi (0.75 bar)
  • Operating temperature -40º - 150ºC (-40º - 300ºF)
  • Operating frequency 1.28 MHz

Recommended for:

  • Potable water
  • River water
  • Cooling water
  • Low-conductivity water
  • Water/glycol solutions
  • Hydraulic oil
  • Diesel and fuel oils
  • Chemicals

 Note: The TTFM 6.1 Transit Time Flowmeter is ideal to measure flow rate of clean, non-aerated fluids in full pipes. Works best on fluids that have less than 2% by volume particulate or gas bubbles.

Ultrasonic transducers mount on the outside of pipes to measure flow rate of clean, non-aerated fluids like water, chemicals and oils. The clamp-on transducers can be mounted without system shutdown. There is no pressure drop and no obstruction. With menu selection of pipe diameter, pipe material, liquid type and measurement units (gallons, liters etc.) Settings, calibration values and totalizer are retained during power interruptions. Instantaneous flow rate, volume total, run hours, and diagnostic information is just some of the information available via optional MODBUS RTU communications.

Measures Flow from the Outside of Metal and Plastic Pipes

TTFM 6.1 Transit Time Flow Meter works by measuring the time of flight difference for ultrasonic sound pulses transmitted from one transducer to another. Depending on the mounting configuration, the signal may cross the pipe once, twice or four times. The time between transmitted and received signals is precisely measured by the flow meter. Ultrasonic signals are sent upstream and then downstream with the transducers alternating their functions as transmitters/receivers. The transit time in the direction of flow is always faster than the transit time against the flow. By comparing these differences with precision timing circuits, the TTFM 6.1 is able to accurately calculate the flow rate. Because the ultrasonic signal is transmitted across the pipe, an average of the flow profile is calculated. Choice of mounting method depends on the application and pipe diameter.

Works with Clean Liquids

The TTFM 6.1 Transit Time Flow Meter is designed for flow measurement of fairly clean, non-aerated liquids in full pipes. High concentrations of solids or gas bubbles (>2% by volume) will attenuate sound and the Transit Time ultrasonic signal may not be able to cross the pipe. A Greyline Doppler flow meter (DFM) is recommended for applications with solids or bubbles (eg. Wastewater or slurries).

Works from the outside of common pipe materials

Mount the TTFM 6.1 ultrasonic transducers on the outside of many pipes including carbon steel, stainless steel, ductile iron, concrete lined ductile iron, cast iron, PVC, PVDF, copper, brass, aluminum and pipes with bonded liners including epoxy, rubber and Teflon. Avoid pipes made with porous materials (e.g. wood or concrete) or with loose insertion liners