K-Patents PR-21-S - Manual (Page 103)

10 Sensor types 97
The FM certified sensors PR-21-S-...-FM are identified by the sensor nameplate.
The Indicating transmitter is a standard DTR.
Figure 10.10 FM nameplate
10.5 Intrinsically safe refractometers PR-21-...-IA
Hazardous locations are places where a possibility of fire or explosion exists be-
cause 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 K-Patents Intrinsically Safe Process Refractometer PR-21-...-IA can be used in
hazardous locations in Zone 0 and Zone 1 areas.
The PR-21-...-IA refractometer has been certified by VTT under the European ATEX
directive 94/9/EC for ATEX Ex II 1G / EEx ia IIC T4 Ga (T
amb
= -20 – +65 °C)
and under the IECEx scheme for Ex ia IIC T4 Ga (T
amb
= -20 – +65 °C). The EC
Type-examination Certificate number is VTT 13 ATEX 052X and the IECEx Certifi-
cate number is IECEx VTT 13.0014X. These certifications cover the following Ex
standards: EN 60079-0:2012 / IEC 60079-0:2011 and EN 60079-11:2012 / IEC
60079-11:2011.
Note: Servicing of the intrinsically safe PR-21-...-IA refractometer is only allowed
for trained service personnel of K-Patents and its representatives. Servicing must
be done according to separate instructions defined by K-Patents and must be re-
ported to K-Patents.
10.5.1 Equipment
The K-Patents Intrinsically Safe Process Refractometer consists of: a modified re-
fractometer sensor PR-21-S-...-IA, an Indicating transmitter STR with single sensor
connectivity, and IS Isolator and cabling between the refractometer sensor and the
transmitter (Figure 10.11).