Operating instructions CWB-ATEX
120799 61 616 07 300 0
05/2021
Page 13 / 14
30046-005k
en
10.2 Opening and closing of Ex d housing
DANGER
Explosion hazard due to incorrect maintenance!
Non-compliance results in severe or fatal injuries to persons.
• Disconnect all supply lines from mains!
• Corroded flameproof Ex-joint must not be cleaned with abrasives
or wire brushes and may only be cleaned chemically, e.g. with
reducing oils from ESSO, type Vassol or similar.
• To avoid corrosion, the flameproof Ex-joint must be treated regu-
larly with acid
–free grease that is compatible with aluminium.
Apply water-repellent, thermally stable and chemically inert
greases exclusively whose drop point is at least 80°C. Corrosion
protection by coating with paint is fundamentally forbidden!
• To open the pressure-proof en-
closed optical beacon first undo the
M4 locking screw fitted at the side.
(see sketch).
• Then unscrew the polycarbonate
hood embedded in the housing by
turning it to the left (about seven
thread turns).
Safety screw with hexa-
gon socket M4
• Closing the housing: Observe caution when fitting the housing and turn it to the
stop
– it is imperative to ensure that the flameproof thread is not damaged (explo-
sion protection)!
• At least five load-bearing thread turns must engage – explosion protection!
• Firmly screw down the locking screw again to protect against turning!
10.3 Repair
DANGER
Explosion hazard due to improper repair!
Non-compliance results in severe or fatal injuries!
• Repair work on the devices must be performed only by the manu-
facturing plant, contact see Chapter 1.
10.4 Returning the device
• Customer service is available for returns for repairs or servicing, see contact data,
chapter 1.
• Provide an exact description of the defect and the SRO (RMA) numbers specified
by Pfannenberg with the device.
• Include a reference document (delivery note or invoice copy).
• Forward the cooling unit to us, complete with all accessories, in the original box or
in comparable packaging with freight and transport insurance pre-paid.
