Rosemount™ 2140 Level Detector
Vibrating Fork

2140 Level Detector
- Vibrating Fork

The new Rosemount™ 2140 is the world’s first wired HART® vibrating fork level detector for applications including overfill prevention, high and low level alarms, and pump protection.

Providing reliable level detection of all liquids as well as sediments, the Rosemount 2140 offers greater ease-of-use and flexibility with smart diagnostics that continuously monitor electronic and mechanical device health, and a fully integrated remote proof-testing capability, helping to increase safety and efficiency of both plant and workers.

The Rosemount 2140:SIS is certified to IEC 61508 (SIL 2) for safety-critical applications.

How it works?

The Rosemount 2140 is a liquid point level device, and is designed to use the principle of a tuning fork. A piezo-electric crystal oscillates the forks at their natural frequency, and changes to this frequency are continuously monitored. The frequency of the vibrating fork sensor changes depending on the medium in which it is immersed.

When used as a low level alarm, the liquid in the tank or pipe drains down past the fork, causing a change of frequency that is detected by the electronics and switches the output state.

When the Rosemount 2140 is used as a high level alarm, the liquid rises in the tank or pipe and makes contact with the fork. The resulting change of frequency is detected and switches the output state.

+ Diagnostic capabilities

  • Built-in diagnostics continuously check the health status of the electronics and the fork sensor
  • Fork conditions detected include external and internal damage, and extreme corrosion
  • Continuous frequency and mA output empowers users with greater insight into the process conditions


+ Smart Diagnostic Suite

  • Frequency profiling
    Detects abnormal frequency deviations and responses from the fork sensor
  • Power advisory
    Detects abnormal deviations in the loop power through the device
  • Process alerts
    Set user-configurable alerts on HART variables


+ Fit and forget

  • Once installed, the Rosemount 2140 is ready to go. It requires no calibration and minimum installation
  • Functional testing of the instrument and the system is easy with a push-button
  • The robust design of the Rosemount 2140 enables it to meet the requirements across a wide range of process environments, and is ideally suited for harsh conditions where high reliability is essential


+ Applications

  • Overfill protection
  • High and low alarms
  • Pump control or limit detection
  • Run dry or pump protection
  • Hygienic applications
  • High temperature applications
  • Wet sand or sediment build-up detection


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Communication Protocol
4-20 mA/HART (easily switchable between HART 5 and HART 7)
Process Media Density
Minimum liquid density is 24.97 lb/ft³ (400 kg/m³)
0.2 to 10000 cP (centiPoise)
Operating Pressure
Full vacuum to 1450 psig at 122 °F psi (100 barg at 50 °C)
Operating Temperature
-40 to 302 °F (-40 to 150 °C) as standard. -94 to 500 °F (-70 to 260 °C) as option
IEC 61508 SIL 2 Certified
Electronic self-checking and condition monitoring. Smart diagnostics suite - frequency profiling, power advisory and configurable process alerts
Optional: Functional test. Only Rosemount 2140:SIS: Local and remote partial proof-test
With Enhanced Package Features enabled: Smart Diagnostic Suite (SDS) with frequency profiling, process alerts, and power advisory functions



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