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SERIES HFM

Ultrasonic Hand Held Doppler (non-invasive)

FLOWMETER

 

 


The Model HFM Flowmeter consists of a dual/hinged, twin crystal transducer and a battery operated transmitter/receiver housed in an aluminum enclosure, small enough to be held in one hand.  Each unit comes complete with transducer, interconnecting cable, battery charger and a padded nylon carrying case.

 

The transducers and the transmitter/receiver electronics are encapsulated to assure long life and stable operation in unfriendly environments.

PRINCIPLES OF OPERATION

The HFM Flowmeter is a non-invasive device utilizing the frequency shift (Doppler Effect) of a signal to measure the flow velocities of liquids.  The transmitters feed a high frequence voltage to the transmitter crystal of the transducer.  The crystal converts the voltage to a high frequency mechanical signal (ultrasonic) which is projected through the wall of the pipe and into the liquid.  The signals are reflected back to a receiver crystal by the discontinuities in the fluid.  The frequency difference between the transmitted and received signal is directly proportional to the fluid's flow velocity.  In order to receive an adequate frequency shift, the liquid must contain reflective particles such as air bubbles, minute particles or other well defined discontinuities.

                

Features                        

Ultrasonic
Hand Held
Lightweight
Non-invasive
Dual Crystal Self Aligning Transducer
Fits Pipe Sizes 1" through 36"
Large LCD Velocity Display
Signal Strength LED Indicator
Externally Adjustable Velocity Calibration Control
Locking Type ON/OFF Switch
Rechargeable Batteries
Calculator Style Battery Charger

Available with; 

instantaneous digital velocity readout in English/Metric units (HFM-1) or,
instantaneous digital velocity readout in English/Metric units plus 4-20mA output (HFM-2) or,
microprocessor based English/ Metric velocity and volume units plus 4-20mA output (HFM-3) or,
instantaneous digital velocity readout in ft/sec and direct GPM readout in English units only (HFM-4) or,
instantaneous digital velocity readout and totalization in English/Metric units plus 4-20mA output (HFM-5E/M). 
 

 

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Last modified: April 17, 2002