Rosemount 3100 Series Ultrasonic Level Transmitter

Easy to configure and manage, the Rosemount™ 3100 Series Ultrasonic Level Transmitter relies on ultrasonic technology for use in a variety of liquid applications. Thanks to its lack of moving parts and non-contact measurement method, ongoing maintenance is nominal. This liquid level transmitter offers the following:

  • Streamlined push button programming

  • Corrosion-proof PVDF wetted material

  • Automatic temperature compensation

  • Two integral signal relays

  • Built-in LCD display

The standard Rosemount™ 3101 Ultrasonic Level Transmitter is built for basic level or distance measurements over a range of 1 to 26 ft. and a 4-20mA signal output. Featuring two integral relays for level or distance measurements over a range of 1 to 36 ft., the Rosemount™ 3102 Ultrasonic Level Transmitter also encompasses volume and open channel flow calculations and a 4-20mA / HART® output.

The Rosemount™ 3105 Ultrasonic Level Transmitter has a PVDF wetside, rendering it inherently safe (Ingress Protection: NEMA 4X, IP66) for use in dangerous and corrosive environments and the majority of associated applications. HART® digital communications are included.

To determine distance and level or compute volume or flow in an open channel, the Rosemount™ 3102 and 3105 Ultrasonic Level Transmitters support the use of an elective external temperature sensor, in addition to the incorporated one. Distance measurements are conveyed via the 4-20 mA or HART® output.

Ultrasonic Measurement Principle

All of these transmitters demonstrate the ultrasonic measurement principle by essentially intercepting ultrasonic pulse signals (echoes) that are conveyed and reflected from the liquid surface. They determine the time-delay between conveying and receiving, then use this data to automatically compute the distance to the liquid surface. The air temperature surrounding the transmitter is constantly measured by an integral temperature sensor, which subsequently calculates the speed of sound in air, automatically recompensing the distance for temperature effects.

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