3
5
Routine maintenance
5.1 Pall filters do not normally require special attention
except for periodic monitoring of the differential pressure
warning device. If no such device is fitted, a specified
scheduled time period for replacement must be
adopted.
5.2 If external leakage is noted, replace O-ring at leak. If
leakage persists, check sealing surfaces for scratches
or cracks; replace any defective parts.
5.3 Differential pressure devices actuate when the element
needs changing or because of high fluid viscosity in
‘cold start’ conditions. If ‘cold start’ conditions exist,
see Section 6.2 and 6.3.
5.4 A dirty system can quickly plug a new filter element,
especially with Pall high efficiency filter media. It may
require one or two initial element changes to stabilize
element life. If element life is short or differential
pressure is excessive, filter may be undersized; refer to
the sizing and selection section of the product literature
or contact your local Pall representative.
5.5 Make sure replacement filter elements are stored clean
& undamaged and that a supply of replacement
elements is available.
6
Differential pressure devices
Reference should be made to product literature (M&EG410EN)
for dimensions, operating parameters, part numbering, ordering
information and specifications.
6.1 Differential pressure devices actuate when the element
needs changing or because of high fluid viscosity in
‘cold start’ conditions.
6.2 If visual indicator is fitted and actuates during ‘cold start’
(button changes from white to red), it will automatically
reset when the normal operating conditions are reached.
If indicator actuates after resetting,
replace element.
6.3 If the electrical switch actuates (e.g. red light comes on)
during cold start, continue operating until the signal
(red light) goes out as system warms to normal
operating conditions. This feature can be used as ‘warm
up’ indication in operating procedures. If the warning
remains or appears when system is warm, replace the
filter element.
All electrical pressure switches have automatic reset.
PIN 1
PIN 2
6.4 If electrical differential device is fitted the use of both
positive indication (green light) and negative indication
(red light for dirty element) is recommended to
effectively monitor filter element life.
Electrical connections and ratings for “C” and “U” (normally
closed) differential pressure switch options:
The switch is wired normally closed. Using normally closed
configuration allows for the detection of damaged or broken
cables or disconnection.
All electrical pressure switches have automatic reset.
Maximum Voltage 48V DC or peak AC
Switching Current 0.5A max
If switch is to be connected to an inductive load or load where
surge current or in rush current flows, then protective circuitry
may be required to lengthen the life of the switch contacts.
G410
V E r S a l o N H I G H P r E S S U r E F I l T E r S
EN
G410 Series
s e r v i c e
i n s t r u c t i o n s
