BEKA BA307NE, Руководство пользователя

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5. INSTALLATION
5.1 Location
When installed in a panel enclosure complying with
the requirements for Ex n protection as shown in
section 3.2 of this manual, both indicators may be
located in a Zone 2 hazardous area providing that
the operating temperature is between –40°C and
+70°C and the installation complies with the
indicator's certification requirements. Certified
Ex e panel enclosures are frequently used as Ex n
panel enclosures.
The indicators may also be installed in an Ex e or
Ex p panel enclosure located in Zone 2 as
described in Appendix 1.
Both indicators have a stainless steel housings
with a 7J front of panel impact resistance
incorporating a 10mm thick toughened glass
window which can withstand a 4J impact. This,
together with a captive silicone gasket which seals
the joint between the instrument and the panel,
enclosure provides IP66 ingress protection. Both
indicators have IP20 rear protection.
Although the front of the indicators have IP66
protection, they should be shielded from
continuous direct sunlight and severe weather
conditions.
Fig 4 show the overall dimensions of the indicators
together with the recommended panel enclosure
cut-out dimensions.
Fig 4 Dimensions
5.2 Installation Procedure
a. Cut the aperture specified in Fig 4 in the
panel enclosure. Ensure that the edges of
aperture are de-burred.
b. Inspect the indicator's captive gasket and
ensure that it is not damaged before inserting
the indicator into the panel enclosure
aperture.
c. If the enclosure panel is less than 1.0mm
thick, or is non-metallic, an optional BEKA
stainless steel support plate should be slid
over the rear of the indicator before the panel
clamps are fitted to evenly distribute the
clamping force and prevent the enclosure
panel being distorted or creeping.
d. Slide a panel clamp into the two grooves at
each corner of the indicator housing with the
M3 stud protruding through the hole at the
rear of the clamp. Fit the stainless steel
spring washer over the stud and secure with
the stainless steel wing nut.
e. Evenly tighten the four clamps to secure the
instrument. The recommended minimum
tightening torque for each wing nut is 22cNm
(1.95 lbf in).
f. Connect the panel enclosure wiring to the
rear terminal blocks. To simplify installation,
the terminals are removable so that wiring
can be completed before the instrument is
installed. Wiring should be supported to
prevent damage resulting from vibration.
g. Finally, fit a silicone rubber push-on cap to
the end of each M3 threaded rod.