9 Sensor specicaons
121
9.8 Teon body refractometer PR-23-M/MS
K-Patents Telon body refractometer PR-23-M/MS is designed for use in chemically
aggressive solutions and ultra-pure ine chemical processes.
PR-23-M is an all-purpose model, PR-23-MS is designed especially for the semicon-
ductor industry. The sensor has a built-in lowcell designed to keep all metal and other
easily corroding parts from coming into contact with the process liquid. All the wetted
parts are made of non-metallic materials, either PTFE (Telon
®
) or PVDF (Kynar
®
),
and thus the PR-23-M/MS sensor withstands corrosion very well.
Figure 9.26 The PR-23-M/MS sensor
Figure 9.26 shows the structure of the sensor. The lowcell (N) and the sapphire plate
(L) are ixed to the stainless steel sensor with four screws. The lowcell (N) is sealed
by a Kalrez O-ring (M). The lowcell prevents any leakage reaching the metal parts,
because there is a circular leakage chamber behind the O-ring (M). The chamber con-
nects to a checkport, which has a 1/8" female thread connection.
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