K-Patents PR-21-S - Manual (Page 7)

1 Introduction 1
1 Introduction
The K-Patents inline refractometer is an instrument for measuring liquid concentra-
tion 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 inline refractometer sensor (in Figure 1.1 and Figure 1.2) measures the refractive
index n
D
and the temperature of the process medium. This information is sent via the
interconnecting cable to the Indicating transmitter (Figure 1.3). The Indicating trans-
mitter DTR calculates the concentration of the process liquid based on the refractive
index and temperature, taking pre-defined process conditions into account. The out-
put of the DTR is a 4 to 20 mA DC output signal proportional to process solution con-
centration. Process data can also be downloaded to a computer via an Ethernet cable.
Labels on the refractometer tells technical model specifications of the refractometer
(Figure 1.4)
Figure 1.1 Sensor standard, model PR-21-S