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Physical Depth Measure and Solar Panel on Green Water TankIf you were to look up “versatile” in the dictionary, you might find a picture of APG’s new MNU IS Intrinsically Safe Modbus Ultrasonic Sensor. Ok, you might not yet, but you should, and soon. With features like APG’s new QuickMode, global Class I, Division 1 hazardous location certification, and RS-485/Modbus RTU standard on every unit, the new MNU IS is capable of handling just about any level measurement situation. Let’s take a look.


APG’s new QuickMode is a power saving feature on the MNU IS that gives you very direct control over the measurement activities of the sensor. A sensor in QuickMode can be activated to take a reading immediately after power up, or at a specified time delay, and then return to a waiting state, or powered down completely.

This configuration provides distinct advantages in two situations. First, for solar- or battery-powered sensors, the time from initiating sensor power-up to power-down after measurement can be less than a second. That means minimal power consumption, so you get maximum battery life. The second advantage comes from the ability to delay the measurement from the time of power on. So, in redundant sensor setups, where crosstalk between transducers is a concern, the QuickMode delay can prevent the backup sensor from taking a measurement until the primary sensor has finished its measurement.

Global Intrinsic Safety Certifications

APG's MNU IS Intrinsically Safe Modbus Ultrasonic SensorBeyond QuickMode, the MNU IS features global Intrinsic Safety certifications. When paired with an appropriate barrier, the MNU IS can be used in Class I, Division 1, Groups C & D hazardous locations. This is true in North America (cCSAus), the European Union (ATEX), and the rest of the world (IECEx). That’s a pretty wide range of coverage.

Modbus RTU

While APG offers other Class I, Division 1 rated ultrasonic sensors, the MNU IS is the only one with Modbus networking capabilities. Up to 10 MNU IS sensors can be controlled by a single APG web-enable controller (the RST-5003 or the LOE), and up to 20 can be programed and controlled via an APG RST-6001 and a PC running APG Modbus software. With all of the configuration options available through APG Modbus software or via levelandflow.com, Modbus control of your sensors in Class I, Division 1 hazardous locations is tremendous advantage.

Merriam-Webster may not have caught on yet, but the MNU IS is the picture of versatile: QuickMode for battery- or solar-powered setups, or redundant sensors; global Class I, Division 1 certifications; and all the programming and control options of APG’s Modbus sensors. The MNU IS can be the ultrasonic sensor you need, wherever you need it to be.

Interested in how the MNU IS can work for you? Give our Measurement Experts a call, or drop them an email today. They’d love to help you match up the right sensor with your application.

Discover APG's MNU IS Sensor

top photo credit: David Goehring via flickr cc