1:1
TITLE
02
CHK'D
1
DR'WN
REV:
JPdB
from Expo Technologies Limited, neither are
they to be used in
any way against our interests.
TOLERANCES
MATERIAL
3rd ANGLE
DO
NOT
SCALE
Expo Technologies Limited
DRAWING
STATUS:
Controlled
1
SURREY KT7 0RH
PSC
APP'D
MINIPURGE X LC SEQUENCE DIAGRAM
CUSTOMER:
BRD
and are returnable upon request. They
are not to be copied or communicated in
part or in whole without written consent
23/06/2010
FLATNESS
TO
BE
LESS
THAN
0.4mm
OVER
ANY
100mm
LENGTH
UNSPECIFIED
PROJECTION
DIMENSIONS
IN
mm
UNITED KINGDOM
JOB No:
DRAWING No.
FINISH
SCALE
The contents of this drawing / document
are Copyright © Expo Technologies Limited.
They are to be treated as confidential
SHEET No.
O
F
2
DEC
PLACE
±0.1
XBR-7TD0-040
NO
DEC
PLACE
±0.5
1
DEC
PLACE
±0.2
DRAWN
DATE:
Purge
timer
resets
Red
=
Pressure
Low
Purge
valve
closes;
Power
Sw.
signal
ON
Is
the
PE
pressure
above
the
minimum?
Green
=
Pressure
OK
Purge
timer
starts
automatically
Red
=
Pressure
Low
Purge
Flow
Sensor
turns
on
Purging
Indicator
turns
Black
as
Yellow
=
Purge
flow
OK
Power
on
-
Normal
operation
Key
to
functions
Minimum
Pressure
s
ensor
turns
on
"Purge
Complete"
signal
to
electrical
Power
Switch
Automatic
operation
by
the
system
No
PRESSURIZED
INDICATOR
Purge
Outlet
flow
above
the
minimum?
"Pressurized"
signal
absent
i.e.
"Alarm"
ON
Air
enters
the
PE
"Purging" Indicator
"Pressurized"
signal
to
remote
alarm
switch
Alarm
and
delayed
trip
Leakage
Compensation
starts
Optional
operation
(User
decision)
Pressurized
Enclosure
door
closed
Action
taken
on
pressure
failure
include:-
Alarm
and/or
Trip
No
Black
=
Purge
flow
too
low
Enclosure
pressure
falls
below
the
minimum
Enclosure
door
opened,
or
excessive
leakage
Relief
Valve
opens
Purge
flow
starts
Purge
flow
falls
below
minimum
Manual
operation
by
the
user
Power
turned
off
automatically
without
delay
Pressurizing
air
or
inert
gas
turned
off
Purge
timer
times
out
Turn
Pressurizing
air
or
inert
gas
on
Minimum
Pressure
sensor
turns
off
Yes
Purge
flow
ceases;
R
elief
Valve
closes
PRESSURIZED
INDICATOR
"Pressurized"
signal
absent
i.e.
"Alarm"
ON
Yes
Outlet
flow
still
above
the
minimum?
No
Yes
depends
upon
the
user.
Actions
PRESSURIZED
INDICATOR
REV.
MOD NUMBER
APPROVED DATE
APPROVED
01
DRAWN
23/06/2010
JPdB
02
5434
20/12/2011
JPdB
THE
RELEVANT
EXPO
CERTIFICATION
DRAWING
IS
EP99-2-3
