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Rosemount 3100 Series Ultrasonic Level Sensors
Key Specifications
Measurement Principle  Ultrasonic, time-of-flight
Measuring Range  26 ft (8 m) for Rosemount 3101
36 ft (11 m) for Rosemount 3102 and 3105
Instrument Accuracy  Model 3101: ± 0.2 in. (5 mm) for <3.3 ft (1 m), 
± 0.5% of measured distance for >3.3 ft (1 m) 
Models 3102 and 3105: ± 0.1 in. (2.5 mm) <3.3 ft (1 m), 
±0.25% of measured distance for >3.3 ft (1 m)
Level Resolution Better than 1/16 in. (1 mm)
Blanking Distance  12 in. (0.3 m)
Output  4-20mA for 3101 
4-20mA with superimposed digital HART® communication for 3102 and 3105
Temperature/Pressure Rating  Refer to the Product Data Sheet (PDF @ 400KB)
Hazardous Location Approvals (for 3105 only)  Intrinsic Safety (ATEX, CSA, IECEx, FM)
Display  Standard 4 ⁄ 5 digit display for configuration purposes.
Output Variables  Level, Distance for 3101 
Level, Distance, Volume, Open Channel Flow for 3102 and 3105
Enclosure  Polyurethane-covered die-cast Aluminum housing.
Ingress Protection  NEMA 4X, IP66
Configuration Tools  AMS, 375 Field Communicator, Rosemount 3490 Series Universal Controller or any other DD- or EDDL-compatible host.



The Rosemount 3100 Series Ultrasonic Level Transmitter is thereliableandcost-effective, non-contacting measurement solution from Emerson. Time proven ultrasonic technology with advanced software and state-of-the-art electronics delivers high reliability in a wide variety of applications.

The3101is the entry level model for simple level measurement. Choose the3102for local control functionality with 2 integral signal relays. For hazardous area applications, the3105is certified intrinsically safe.

  • Continuous non-contacting measurement with no moving parts
  • Standard Integral LCD and push buttons for simple setup and on-site programming
  • 2 Integral signal relays for local control for(3102 only)
  • Aluminum housing and corrosion resistant PVDF wetted material
  • Volume or open channel flow calculations with pre-programmed library
  • Easy plant integrationwith 4-20mA ⁄ HART® output and PlantWeb support
  • Automatic temperature compensation with integral or optional remote temperature sensor
  • 2-wire dc loop-powered
  • Wide operating range to 36 ft. (11 m)

Features & Benefits:

The Rosemount Series 3100 Ultrasonic Level Transmitter is a cost-effective measurement solution for a wide range of applications. It has no moving parts, corrosion resistant PVDF wetted material and a non-contacting measuring method. So, it requires almost no maintenance. It is unaffected by liquid dielectric constant, viscosity and density changes. Additionally the 3100 Series offers the following benefits:

  • Low cost of installation
  • Low cost of commissioning
  • Minimal maintenance costs
  • Process downtime minimized

  • The transmitters are available with threaded or flanged connections, making them easy to install. Several pre-programmed laws and strapping tables make configuration easy. Configuration can be performed by using the local operator interface or HART® configuration tools such as the 375 Field Communicator or AMS™Suite: Intelligent Device Manager.
  • The transmitters can be used with the Rosemount 3490 Series of wall and panel mounted control units, providing power and comprehensive control options. The transmitter is available with two integral relays, adding to the local control functionality.
  • The non-contact sensor is made from an inert material offering superior corrosion resistance and low maintenance requirements.
  • The integral or remote mounted temperature sensor enables automatic corrections where temperature changes in the tank free space could otherwise result in an inaccurate reading.
  • The local programming menu is easy to use. The 3100 may be installed using the 2 in. thread or available flange options either directly to the vessel or on a suitable bracket above the liquid surface. Three internal buttons are used to program the transmitter with the tank depth and the range for the 4-20mA output.
A built-in LCD display under the cover is provided to aid setting up.The user navigates through an intuitive menu, entering data as prompted by the transmitter. Intelligent software ensures only data specific to the chosen application is requested, minimizing programming time.



Storage Tanks: Vertical Tank Buffer Tanks: Horizontal Tanks
Open Air Applications Open Channel flow