Chapter 1
Introduction
Overview
Thermo Scientific designed the family of DensityPRO measurement systems to
provide reliable, accurate process material density measurements for a wide variety of
challenging applications. The density gauge, which attaches to the outside of the
process vessel or pipe, never contacts the process material and can measure the density
of almost any liquid, slurry, emulsion or solution.
Each gauge can convert the basic density measurement into a variety of output values
as appropriate for specific applications, e.g., bulk density or percent-by-weight solids.
Given a temperature input, the gauge can compensate for process temperature swings,
reporting the density measurement corrected to a user-specified reference temperature.
If a flow input is provided, it can calculate material mass flow.
The system consists of up to three basic elements: the source head, which contains the
radioisotope source; the detector, which converts the incident radiation to a useable
electronic signal; and the transmitter, which translates the detector’s signal in to a
density value.
The radioisotope source emits gamma radiation, which passes through the vessel wall
and the process material before arriving at the detector. The detector then measures the
level of arriving radiation to determine the density of the process material. The amount
of radiation that reaches the gauge varies inversely with the density of the process
material.
Note: The gamma radiation used by the gauge cannot make the vessel, process
or structure radioactive.
Figure 1-1. DensityPro Measurement System
Thermo Scientific DensityPRO Installation Manual 1-1
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