12. PR‑23 process
refractometers in
potentially explosive
atmosphere
The PR‑23 refractometer series can be used in locations with potentially explosive
atmosphere with the following
modifications, made by Vaisala Oyj. The refractometer
sensor’s compliance with the Essential Health and Safety Requirements is assured by
complying with standard EN 50 021:1999.
The PR
‑23‑…‑AX refractometers have been certified by DEKRA Certification B.V. under the
European ATEX directive 2014/34/EU for ATEX Ex II 3G / Ex nA IIC T4 Gc and under the
IECEx scheme for Ex nA IIC T4 Gc. The Type-examination Certificate number is KEMA
05ATEX1183X and the IECEx Certificate number is IECEx KEM 10.0033X. These certifications
cover the following Ex standards: EN 60079-0:2012 / IEC 60079-0:2011, EN 60079-15:2010 /
IEC 60079-15:2010.
The PR
‑23‑…‑FM refractometers are certified by Factory Mutual Research Corporation,
Approval ID 3026104. Equipment Ratings: Nonincendive for use in Class I, Division 2, Groups
A, B, C & D, Hazardous (Classified) Locations. Temperature identification rating for
PR‑23‑…‑FM is T6 (T
amb
= 45 °C).
The PR
‑23‑…‑CS refractometers are certified by Canadian Standards Association for Class I,
Division 2, Groups A-D. The
Certificate Number is 1706327. Equipment Ratings:
Nonincendive for use in Class I, Division 2, Groups A, B, C & D, Hazardous (Classified)
Locations. Temperature identification rating for PR‑23‑…‑CS is T4 (T
amb
= 45 °C).
The PR
‑23‑…‑CX refractometer is certified by Nepsi under Chinese standards under the
IECEx scheme for Ex nA IIC T4 Gc. The type-examination certificate number is GYJ19.1134X.
This certification covers the following Ex standards: GB 3836.1-2010 and GB 3836.8-2014.
12.1 Equipment
The refractometer system, in the following figure,
for potentially explosive atmosphere
locations consists of a
modified refractometer sensor PR‑23‑…‑AX/FM/CS/CX, a standard
Indicating transmitter DTR and a sensor cable PR‑8230‑…
PR-23 Series User Guide
IM-EN-PR23-E
216
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