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 Eurofins Expert Services Oy, under the European ATEX directive 2014/34/EU for ATEX Ex II 3G / Ex ec IIC T4 Gc and under the IECEx scheme for Ex ec IIC T4 Gc. The EU-Type examination Certificate number is EESF 21 ATEX 013X and the IECEx Certificate number is IECEx EESF 21.0008X. These certifications cover the following Ex standards: EN IEC 60079‑0:2018 / IEC 60079‑0:2017 and EN IEC 60079‑7:2015/A1:2018 / IEC 60079‑7:2017.
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. The temperature identification rating for PR‑23‑…‑FM is T6, Tamb = −20 … +45 °C (−4 … +113 °F).
The PR‑23‑…‑CS refractometers are certified by Canadian Standards Association for Class I, Division 2, Groups A, B, C & D. The Certificate Number is 1706327. Equipment Ratings: Nonincendive for use in Class I, Division 2, Groups A, B, C & D, Hazardous (Classified) Locations. The temperature identification rating for PR‑23‑…‑CS is T4, Tamb = −20 … +45 °C (−4 … +113 °F).
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.
The PR‑23‑…‑RX refractometer is certified by LLC Certification Center VELES under Russian standards for 2Ex na IIC T4 Gc X, Tamb = −20 … +65 °C (−4 … +149 °F). The Certificate number is ЕАЭС RU С-FI.AД07.В.01949/20. The certification covers the following Russian standards: GOST 31610.0-2014 (IEC 60079-0:2011) and GOST 31610.15-2014 (IEC 60079-15:2010).