YOKOGAWA ZR22S, User Manual

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<3. Installation>
3-3
IM 11M13A01-02E
Note 5: Cable Entry
• The threaded type of cable entry is marked beside the cable entry according to
the following markings.
Threaded type : Marking
M20 x 1.5 : M
1/2 NPT : N
• The cable entry devices (cable glands etc.) and blind plugs shall be in type of
protection Ex “db” or Ex “tb”, suitable for the conditions of use and correctly
installed. They shall provide a degree of ingress protection of at least IP66.
Note 6: Special conditions for safe use
Electrostatic charge may cause an explosion hazard. Avoid any actions that
cause the generation of electrostatic charge, such as rubbing with a dry cloth.
If it is mounted in the area where the use of Ex “tb” apparatus is required, it
shall be installed in such a way that the risk from electrostatic discharges and
propagating brush discharges caused by rapid flow of dust is avoided.
Note 7: Special fastener
Hexagon socket head cap screws below are special fastener according to
EN60079-0: 2012+A11: 2013 (see the figure below). Material property classes
of them are A2-50 or better.
Special fastener
Figure 3.2 Special fastener
3.1.3 FM Explosion-proof Type
ZR22S-B Detector for use in hazardous locations:
Note 1: Applicable Standard: FM3600 1998,FM3615 1989, FM3810 2005, ANSI/
NEMA 250 1991
Type of protection: Explosion-proof for Class I, Division 1, Groups B, C and D
Dust-ignitionproof for Class II/III, Division 1, Groups E, F and G
Enclosure Rating: NEMA 4X
Temperature Class: T2
Note 2: Wiring
• All wiring shall comply with National Electrical Code ANSI/NEPA 70 and Local
Electrical Code.
• In hazardous location, wiring shall be in conduits as shown in the figure.
WARNING: SEAL ALL CONDUITS WITHIN 18 INCHES OF THE ENCLOSURE.