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K-Patents Process Refractometers are commonly used to determine the concentration of a dissolved solids by making an optical measurement of a solution’s refractive index (nD).

K-Patents refractometer sensor measures the refractive index nD and the temperature of the process medium. The measurement is based on the refraction of light in the process medium, i.e. the critical angle of refraction using a yellow LED light source with the same wavelength (580 nm) as the sodium D line (hence nD).

The measured refractive index nD and temperature of the process medium are sent via the interconnecting cable to the Indicating transmitter. The Indicating transmitter calculates the concentration of the process liquid based on the refractive index and temperature, taking pre-defined process conditions into account.

The output of the transmitter is a 4 to 20mA DC output signal proportional to process solution concentration, liquid density, Brix or other scale that has been selected for the instrument. Process data can also be downloaded to a computer via an Ethernet cable.

The basic Process Refractometer system consists of one or two sensors connected to an Indicating transmitter. However, there are different sensor models, each model is adapted for different industrial requirements.

Learn more about Refractive Index measurement principle pdf

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PR-23 Platform

The PR-23 series is the latest addition to K-Patents Process Refractometer product line. The PR-23 includes an Ethernet based communications solution. This allows connection to computer networks, and real-time measurement data and diagnostic information on the Web and Ethernet access from anywhere in the world by an Internet (IP) address. This also makes it a valuable service tool for parameter changes and software up-dates.

The benefit of having Ethernet connectivity in a field instrument is that it is the most widely used local area network (LAN) standard with most types of computer having such a connection. Therefore, only a cross-over cable and some data acquisition software is needed for collecting the data from the PR-23 refractometer. Communication is built on standard protocols (UDP/IP) and K-Patents offers ready-to-install software for data acquisition.

Additional features include interchangeability and dual connectivity of the sensors. All PR-23 sensors have identical calibration and each sensor gives Refractive Index nD and temperature as output. These enable sensors to be freely interchanged without optical calibration or parameter changes. It is simply a matter of plug and play!