• Craig Drabyk

Selecting a Level Sensor


When selecting a level sensor, Omni Instrumentation & Electrical Services takes certain factors into consideration to help determine which device to best suits our client’s specific application. These include:

  • medium

  • temperature

  • pressure/vacuum

  • chemistry

  • dielectric constant

  • density

  • agitation

  • noise

  • vibration

  • mechanical shock

  • tank size and shape

Once these attributes have been determined, we ask and answer these important questions:

  • Can the level sensor be located inside the tank, or should it be completely external?

  • Must the sensor detect the level continuously, or will a point sensor (indicating levels above or below the sensing point) be adequate?

  • Can the sensor come in contact with the process fluid or must it be located in the vapor space?

  • Is direct measurement of the level needed or is indirect detection of the hydrostatic head (which responds to changes in both level and density) acceptable?

  • Is tank depressurization or process shutdown acceptable when sensor maintenance or replacement is required?

Other details Omni considers when helping clients select a level sensor include response rate, ease of calibration or programming, mounting requirements or constraints, and user preferences. Always opt for a high-quality instrument from a reputable manufacturer once choices have been narrowed down.


There are many different design variations, and this guide only serves as a starting point for choosing a level sensor. Please contact Omni Instrumentation & Electrical Services at (908) 412-7130 or (240) 341-7915 for more information.


About Omni


Omni Instrumentation & Electrical Services, Inc., located in New Jersey and Maryland, is a premier instrumentation and electrical contractor, providing superior total care solutions since 1986. Services include instrument installation, tubing installation, instrument calibration, control loop testing, startup and commissioning, power and lighting, process control wiring, BMS wiring, telecommunications and data wiring, fire alarm wiring, security wiring, process network wiring, and control panel fabrication. Omni Instrumentation & Electrical Services, Inc., is certified in Foundation Fieldbus, Profibus, DeviceNet and ASI-Bus installation.

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