4.8
Jog system and fill filter. Pressurize system fully and
check for leaks; if leaks occur refer to Section 5.
5
Routine maintenance
5.1
Pall
filters do not normally require special attention
except for periodic monitoring of the differential pressure
warning device. Schedule replacement of filter element
every six months or sooner, and have ample supply of
spare elements available.
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 element change labels are clean and
undamaged. Replace illegible labels with the appropriate
new labels.
6
Differential Pressure Devices
Reference should be made to product literature 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 the differential pressure switch actuates during cold
start, continue operating until the signal goes out as
system warms to normal operating temperature. This
feature can be used as 'warm up' indication in operating
procedures. If the warning signal remains or appears
when system is warm, replace the filter element.
6.3
Use of both positive indication and negative indication is
recommended to effectively monitor filter element life.
NOTE: These electrical and visual Differential pressure
devices (respectively, F5 and FD series) are very specific
to the UR209 series.
Electrical connections and ratings for F5 code electrical
pressure switch options:
28 VDC
= 3A (inductive),
5A (resistive)
Amperage: 200mA
maximum
Circuit:
SPST Normally open circuit
Ground through filter assembly
to chassis
CAUTION:
Failure to bleed the filter housing adequately will
increase the dissolved air content of the system fluid
which will shorten fluid life and may cause other
problems in the system.
UR209
UR209 Series
R E T U R N L I N E F I LT E R S
s e r v i c e
i n s t r u c t i o n s
2
Figure 1
- Switch Circuit Diagram
