1 Introduction
1
© Copyright Vaisala 2019. All rights reserved.
1 Introduction
Hazardous locations are places where a possibility of fire or explosion exists because of
flammable gases, vapors or fine dust.
Zone 0:
An area in which an explosive gas-air mixture is continuously present
or present for long periods of time.
Zone 1:
An area in which an explosive gas-air mixture is likely to occur in normal
operation.
The Vaisala K-PATENTS® Intrinsically Safe Process Refractometer PR-43-...-IA can be in-
stalled in hazardous locations in Zone 0 and Zone 1 areas. The PR-43-...-IA refractome-
ters have been certified by Eurofins Expert Services Oy under the European Union ATEX
directive 2014/34/EU for ATEX Ex II 1G/Ex ia IIC T4 Ga, Ex I M1/Ex ia I Ma (refractome-
ter) and Ex II 3(1)G/Ex nA [ia Ga] IIC T4 Gc (isolator) and under IECEx scheme for Ex
ia IIC T4 Ga and Ex ia I Ma (refractometer) and Ex nA [ia Ga] IIC T4 Gc (isolator). The
EU-Type examination Certificate number is EESF 19 ATEX 056X and the IECEx Certifi-
cate number is IECEx EESF 19.0024X. These certifications cover the following Ex stan-
dards: EN 60079-0:2012/IEC 60079-0:2011, EN 60079-11:2012/IEC 60079-11:2011, EN
60079-15:2010/IEC 60079-15:2010 and EN 60079-25:2010/IEC 60079-25:2010-02.
Zone 2:
An area in which an explosive gas-air mixture is not likely to exist under
normal conditions, but may be present under abnormal conditions.
The PR-43-...-AX/CU refractometers can be installed in Zone 2 or unclassified zone.
The PR-43-...-AX refractometers have been certified by Eurofins Expert Services Oy un-
der the European Union 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 EU-Type examination Cer-
tificate number is EESF 19 ATEX 058X and the IECEx Certificate number is IECEx EESF
19.0026X. 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-43-...-CU refractometers are certified by Canadian Standards Association (CSA)
for Class I, Division 2/Zone 2 environments for use in Canada and USA, the certificate
number is CSA 17.70081253. Equipment ratings:
1. Nonincendive for use in Class I, Div 2, Groups A, B, C, D, Hazardous Locations, Tem-
perature rating T4, T
amb
=-40...+65°C
2. Ex nA IIC T4 Gc (Zone 2), AEx nA IIC T4 Gc (Zone 2), Non-sparking