MEDC CU1 User Manual

Page 3

1.0 INTRODUCTION

This range of combined sounders and beacons is intended for use in potentially explosive gas atmospheres and

has been designed with high ingress protection to cope with the harsh environmental conditions found offshore

and onshore in the oil, gas and petrochemical industries.

The unit is available in two versions suitable for use in the following ambient temperatures:

CU1-S Standard unit – Ex de IIB T4 (Tamb -50°C to +50°C

CU1-H High temperature unit – Ex de IIB T4 (Tamb -50°C to +70°C) IP66 and IP67

The flamepaths, flare and body are manufactured completely from a UV stable glass reinforced polyester.

Stainless steel screws and mounting bracket are incorporated thus ensuring a corrosion free product. Tapered

and threaded flamepaths are used to overcome the problems of assembly of parallel spigot flamepaths.

Units can be painted to customer specification and supplied with identification labels.

2.0 GENERAL SAFETY MESSAGES AND WARNINGS

All instructions and safety messages in this manual must be followed to allow safe installation of the device. The

device must only be installed and maintained by correctly trained site personnel/installers.

To reduce the risk of ignition of hazardous atmospheres and shock, do not apply power to the device until

installation has been completed and the device is fully sealed and secured.

ii.

To reduce the risk of ignition of hazardous atmospheres and shock, keep device tightly closed when the

circuit is energised.

iii.

Before removing the cover for installation or maintenance, ensure that the power to the device is isolated.

iv.

Following installation, test the device to ensure correct operation.

Following installation ensure a copy of this manual is made available to all operating personnel

vi.

When installing the device, requirements for selection, installation and operation should be referred to

e.g. IEE Wiring Regulations and the ‘National Electrical Code’ in North America. Additional national

and/or local requirements may also apply.

vii.

Cable termination should be in accordance with specification applying to the required application.

MEDC recommends that all cables and cores should be correctly identified. Please refer to the wiring

diagram in this manual (or separate diagram provided with the unit).

viii.

Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded

and correctly earthed.

ix.

Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry

points and that the NEMA/IP rating of the unit is maintained.

MEDC recommend the use of a sealing compound such as HYLOMAR PL32 on the threads of all glands

and stopping plugs in order to maintain the IP rating of the unit.

xi.

A suitable sealing washer must be fitted to all glands and stopping plugs fitted into the enclosure.

xii.

The internal earth terminal, where fitted, must be used for the equipment grounding and the external

terminal, if available, is for a supplementary bonding connection where local codes or authorities permit

or require such a connection.

xiii.

When installing the device, MEDC recommends the use of stainless steel fasteners. Ensure that all nuts,

bolts and fixings are secure.

xiv.

The unit should be positioned such that debris, dust or water cannot settle in the re-entrant horn.

3.0 INSTALLATION

The unit is mounted via the 2 off Ø9mm fixing holes in the U-shaped stirrup/mounting bracket. If required, the

unit can be initially placed via the Ø13mm central hole in the stirrup. The unit can then be rotated to the required

position and fixed via the other holes.

The two fixing holes have been designed to accept an M8 screw or bolt.

) IP66 and IP67

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