K-Patents PR-03 - Manual (Page 7)

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1 Introduction 1
1 Introduction
The K-Patents inline refractometer is an instrument for measuring liquid concentration in the process line.
The measurement is based on the refraction of light in the process medium, an accurate and safe way of
measuring liquid concentration.
The refractometer sensor (A in figure Figure 1.1), mounted inline, sends a ray of light into the process
medium and measures the angle in which the light is refracted back from the liquid. This information is
then sent via the interconnecting cable (B) to the Indicating transmitter (C). The Indicating transmitter (IT-
R) then calculates the concentration of the process liquid based on the refractive angle, taking temperature
and pre-defined process conditions into account. The output the IT-R provides is a 4 to 20 mA DC output
signal proportional to process solution concentration, but a serial output is also available as a standard.
C: Indicating Transmitter
A B C D
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K-PATENTS
PROCESS INSTRUMENTS
B: Interconnecting cable A: Sensor
Figure 1.1 Refractometer equipment.
1.1 PR-03 refractometer models
The basic system of a sensor and an Indicating transmitter connected with a cable is the same in all PR-03
Inline refractometer models. However, there are different sensor models, each adapted for different process
requirements.
The Sanitary refractometer sensor PR-03-A and the Probe refractometer sensor PR-03-P both meet
the 3-A Sanitary Standard requirements. The model PR-03-A is an all-purpose instrument for a variety of
alimentary processes while the PR-03-P is especially designed for cookers and tanks and can even be used
in combination with a scraper in alimentary as well as other processes.
The Compact process refractometer PR-03-D is an all-round instrument for measuring the concentration
of a wide range of chemicals and liquids. The Process refractometer PR-03-M is built for chemically
aggressive solutions and ultra-pure processes, all of its wetted parts are made of non-metallic materials.
The Valve body refractometer PR-03-W is very similar to the Process refractometer PR-03-M, but the
special valve body makes it possibly to use it in large-scale production and large pipelines.
The model number of a refractometer system is displayed on the serial number label on the sensor head
(see Chapter 8, “Sensor specifications and other sensor information”). The serial numbers on the sensor
identification label (see Chapter 8) and the transmitter’s identification label (see Chapter 9) should always
match.