Posted in | Level Sensors

SonAire® M3 150 kHz Sensor for Monitoring Fluids and Solid Materials

MassaSonic® SonAire® Series M3 and M3is Sensors are battery operated wireless level sensors that intercommunicate using ZigBee RF Modules. The M3is versions are intrinsically safe rated for CIDI, zone Ø and CID2 environments. These sensors have detection ranges from 4" (100 mm) to 35' (10.7m).  

The sensors use modern ultrasonic technology to provide precision non-contact distance measurement for liquid level solid stockpiles or remote locations and hazard zones. Compared to other systems, the M3 sensors are considered to excel due to their effortless operation, affordability, and ability to be installed and calibrated without the need for a target.

The sensors pass on narrow beam sound pulses, report the distance to the target, and process return echoes. Kynar (PVDF) is the sensor housing material that is used to provide the ultimate in chemical resistance existing in extremely rough industrial environments. The short range version is ideal for small tanks, totes, horizontal tanks and tallow pond monitoring.

The RoHS compliant SonAire Sensors® measure and store information such as battery voltage, temperature, range, and various other parameters at user-set time intervals. The sensor is commissioned onto the ZigBee network using an internal pushbutton, and the operating mode is identified with the help of an LED.

The package is rated for both immersion and high pressure washing in agreement with IP67. The batteries employed are widely used lithium AA type and can be easily replaced. Typical battery life is 4 years.

All sensors in the SonAire® Series are available in two variants. Standard SonAire M3 Sensors are custom designed such that they are ideal for operation in typical industrial applications. Intrinsically safe SonAire M3is Sensors can also be used in unsafe environments. SonAire M3is Sensors are certified by Factory Mutual as meeting the demands of Class 1 Div 1 (C1D1), All Groups, which is the highest rating.

Key Features

The main features of the SonAire® M3 150 kHz Sensor are as follows:

  • Cost efficient
  • Chemically resistant PVDF construction
  • Narrow Beam
  • Built-in temperature/sound speed compensation
  • Effortlessly replaceable long-life batteries
  • Wireless, 10 sensors/gateway
  • Low power
  • Enable set-up where power lines are not available


The key applications of the SonAire® M3 150 kHz Sensor are as follows:

  • Quick, remote set-up sites
  • Flood zone monitoring and waste basins
  • Mine, oil patch and chemical operations
  • Solid and liquid level monitoring
  • Totes, and tanks, totes, and drums
  • Danger zones
  • Outdoor stockpiles

Specifications of SonAire® M3 150 kHz Sensors

The key specifications of the SonAire M3 150 kHz Sensors are listed below:

Model M3 (standard)
150 kHz
Minimum Detection Distance 4 inches
(100 mm)
Maximum Detection Distance 7 feet
(2.1 m)
Class General Purpose
Wireless Yes
Output Zigbee
Housing Material PVDF
Mount 2 inch NPT
Radio 100 mW
Operating Temperature -30°C to 70°C


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