Vaisala K-PATENTS PR-23 Series, Instruction Manual, Page: 144 / 246

134 PR-23 instruction manual
9.10 PR-23 process refractometers in potentially
explosive atmosphere
The PR-23 refractometer series can be used in locations with potentially explosive
atmosphere
with following modifications, made by Vaisala Oyj . The refractometer sen-
sor’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. un-
der 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 Certifi-
cate 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 Corpora-
tion, Approval ID 3026104. Equipment Ratings: Nonincendive for use in Class I, Divi-
sion 2, Groups A, B, C & D, Hazardous (Classified) Locations. Temperature identifica-
tion 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 Rat-
ings: Nonincendive for use in Class I, Division 2, Groups A, B, C & D, Hazardous (Clas-
sified) Locations. Temperature identification rating for PR-23-...-CS is T4 (T
amb
= 45
°C).
9.10.1 Equipment
The refractometer system (Figure 9.31) for potentially explosive atmosphere loca-
tions consists of a modified refractometer sensor PR-23-...-AX/FM/CS, a standard In-
dicating transmitter DTR and a sensor cable PR-8230-...
Hazardous area
(up to Zone 2)
Safe Area
PROCESS INSTRUMENTS
POWER
WIRING SEE WRG-342
Figure 9.31 Refractometer system PR-23-...-AX/FM/CS