Soon after the advent of the Accutron Plus FN for large intake and exhaust fans, came the demand for a system to monitor the airflow from Auxiliary Booster Fans and in industrial ducting.  Thus, the Accutron Plus IDM was specifically designed for round or square duct mounting and to precisely monitor lower airflows.  It also boasts a modular design complete with non-corrosive materials and the same proven Ultrasonic Time of Flight technology as in the Drift and Fan units for years of consistent, accurate and reliable
Airflow readings.

The Accutron Plus IDM is available in three different models.  The IDM-25, IDM-75 and IDM-70.  The IDM 25 is generally used in smaller ducting under 20” in diameter.  The IDM-75 is the most common, used in ducting up to 10’ in diameter.  The IDM-70 is the new monitor specifically designed for use in high temperature applications up to 150 degrees Celsius.

The Accutron Plus series uses Ultrasonic Time of Flight technology to accurately measure bi-directional airflow.  Ultrasonic pulses are sent back and forth between the transducers across the fan section, traveling through the air current.

Let “TA-B” be the time taken for the signal to travel from Transducer A to Transducer B, and “TB-A” be the time taken for the pulse to travel from Transducer B to A.  The control unit accurately measures the time-of-flight for each direction.  The difference between the measured times (TA-B – TB-A) is directly proportional to the airflow.  In the case of no moving air, then TA-B equals TB-A and there is no time difference because there is no airflow. 

See product brochure PDF or contact you Accutron sales representative for more information.

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