Removing The Cover - MEDC HD1 Manual Tecnico

English
1.0 INTRODUCTION
The HD1 heat Detector has been designed for use in flammable atmospheres and harsh en-vironmental
conditions. The marine grade alloy (EExd version) or Glass Reinforced Polyester (EExem and EExia versions)
are suitable for use offshore or onshore, where light weight com-bined with corrosion resistance and strength is
required.
2.0 INSTALLATION
The Heat Detector is mounted via 4 X Ø9mm(EExd version) or 4 X Ø7mm(EExem/EExi versions) fixing holes in
feet on the base of the unit. The fixing holes have been designed to accept an M8(EExd version) or
M6(EExem/EExi versions) caphead screw or bolt. Cooper MEDC recommend the use of stainless steel fasteners.
The Heat Detector will operate in any attitude

2.1 Removing the Cover

Unscrew the 4 x M6(EExd version) or 4 x M5(EExem/EExi versions) cover fixing screws and lift the cover clear
of the enclosure.
See 2.2 Cable Termination
After cable termination has been completed the cover can be replaced and secured to the enclosure.
2.2 Cable Termination
Cable termination should be in accordance with specifications applying to the application. Cooper MEDC
recommend that all cables and cores should be fully identified. Ensure that only the correct certified glands are
used and that the assembly is shrouded and correctly earthed. All cable glands should be of an equivalent IP
rating to that of the Heat Detector. In order to maintain the IP rating, the glands should be sealed to the Heat
Detector using a sealing washer or sealing compound. The internal earth terminal must be used for the
equipment grounding connection and the external terminal is for a supplementary bonding connection where
local codes or authorities permit or require such connection.
2.3 General
When installing and operating explosion-proof electrical equipment, the relevant national regulations for
installation and operation (e.g. EN60079-14 and IEE Edition Wiring Regulations) must be observed.
Ensure that all nuts, bolts and fixings are secure. Ensure that only the correct certified stopping plugs are used
to blank off unused gland entry points. We recommend the use of 'HYLOMAR PL32 COM-POUND' on the
threads of the stopping plugs in order to maintain the IP or NEMA rating of the unit.
3.0 OPERATION
The Heat Detector consists of a sealed element containing a single normally open (N.O.) thermal switch which
operates at a fixed temperature. The sensor element is fully sealed and no attempt must be made to modify this
in any way. Adjustment of the temperature setting is not possible.
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12/11 © Cooper MEDC 2011