Density Measurement Sensor

Whether for a new or existing installation, the Density Measurement Sensor easily installs on the OPW Magnetostrictive Probe. Combining industry-leading accuracy for water, product and density measurement, the SiteSentinel® family Density Measurement Sensor uses a single magnetostrictive in-tank probe assembly.

The sensor continuously measures the density of the fuel in the tank, providing a measure of even the smallest changes in product quality within the API density range. Fuel density reports can be displayed real-time on the SiteSentinel® family of controllers or exported to an external display. The density readings can be configured to either nominal or temperature-corrected density.

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Density Measurement Sensor

Density Measurement Sensor

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  • Features & Benefits
  • Technical Specifications
  • Downloads

Density Measurement Sensor Features

  • Accurate - Uses float displacement, taking advantage of the precision and accuracy of the magnetostrictive probe’s level measurement which is capable of detecting changes of 0.0005 inches (0.0127 mm)
  • Installation - Density and level measurement combined on one IS channel
  • Integration - As with every OPW tank gauge component, the density sensor works seamlessly with the SiteSentinel® family of products
  • Savings - Easily retrofitted to new and existing in-tank SiteSentinel® 924B level probes, providing an economical solution to ensure continuous product quality
  • Trouble-free design
  • Easy to retrofit to existing in-tank level probes (SiteSentinel® 924B Probe)
  • Density and level measurement combined on one IS module position connection without the need for a dedicated input channel or additional wiring
  • Fits through the same 2" (5 cm) opening in the tank that’s used by the probe
  • Economical solution to ensure continuous product quality
  • 4 probes (with density sensor) per IS Channel (Sitesentinel® iSite™ only)
  • Dedicated density probes can support three (3) density sensors per probe to ensure product quality – not available with level measurement
OPW LPG Floats and Density Measurement Sensors are not certified for applications in which they will be subjected to pressures at or above 300 PSI. Pressures higher than 300 PSI will damage the devices, preventing them from providing accurate measurements.


  • Provide real-time, accurate density information
  • Displays density in kg/m3, g/cc or API
  • Applicable in petroleum products designed for both underground (UST) and aboveground (AST) rigid probe applications
  • Single sensor per standard in-tank probe or multi-sensor for dedicated triple-sensor density probe


  • Material: Nitrophyl, Delrin and Stainless Steel Spring
  • Resolution: 0.00004 g/cc
  • Accuracy: ±0.0025 g/cc
  • Density Range: 0.6 – 1.0 g/cc
  • Operating Temperature: -40° to 140° F (-40° to 60° C)
  • Dimensions: 2" (diameter) x 11" (5 cm [diameter] x 28 cm)
  • Number of Sensors Per iSite™ System: One per probe or multi-sensor dedicated probe equipped with 3 sensors

Proven Magnetostrictive Technology

  • Supports extended operating temperature range: -40º to 140º F (-40º to 60º C)
  • Compatible with gasoline, diesel and other approved fluids

Magnetostrictive Probe Data

  • Measures product level changes to a resolution of 0.0005" (0.0127 mm)
  • Measures product temperature changes to a resolution of 0.001° F (0.0005° C)
  • Measures water level changes to a resolution of 0.01" (0.254 mm)
  • Linearity over the entire probe length is ± 0.04" (1 mm)

Probe Specifications

  • Type: Magnetostrictive/Float
  • Material: All Stainless Steel Construction, Aluminum Cap
  • Location: Hazardous, Class 1, Division 1, Group D
  • Probe Inputs: Intrinsically Safe
  • Probe Power Supply: 12 VDC Nominal
  • Level Precision: ± 0.0005" (0.0127 cm)
  • Level Accuracy: ± 0.04" (1 mm)
  • Temperature: ± 0.9° F (± 0.5° C)
  • Temperature: 5 RTDs
  • Temperature Range: -40º to 140º F (-40º to 60º C)
  • Data Cable: 1000' (300 m) Belden 88760 or 500' (150 m) max. Belden 88761 equipped with 3 sensors.