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M
AINTENANCE
With just normal routine maintenance the VX500 can be
depended upon to provide years of reliable service. The
following guidelines should be followed when performing
maintenance on the VX500.
C
HARGING THE
The lithium-ion battery pack should be fully charged
before using the VX500. To charge the battery pack, plug
the flying lead from the VX500 battery charger into the
socket on the back of the instrument. The VX500 battery
pack will be fully charged within 5 hours. With a fully
charged lithium-ion battery pack, the VX500 should
function for up to 18 hours of continuous operation. As
battery life decreases, the shaded area of the battery icon
will also decrease. With a minimum of 15 minutes of
battery life remaining the VX500 will emit a periodic beep
alerting you to charge or replace the battery.
DO NOT REPLACE OR CHARGE INSTRUMENT
BATTERIES IN HAZARDOUS LOCATIONS!
A replaceable cell alkaline battery pack (7 hours run-time)
is also available for use with the VX500. To remove the
battery pack and replace the 3 AA battery cells, loosen the
two screws from the battery cover on the back of the
instrument. Remove the battery pack and replace the AA
battery cells with fresh alkaline batteries. Replace the
battery pack and battery cover in the same fashion.
C
HANGING THE
The VX500 sample inlet is protected by an internal dust
filter/water stop. When this filter becomes obstructed the
VX500 will display a PUMP FAULT condition and the
alarm will sound continuously to indicate that inadequate
22
B
ATTERIES
!
CAUTION
I
F
NTERNAL
ILTER
sample flow is being delivered to the instrument. To
replace the filter, unscrew the sample inlet housing from
the top of the instrument. Remove the dust filter/water
stop and replace it with a new, fresh one. During
replacement, ensure that the filter is inserted with the clear
end down. Replace and tighten the sample inlet fitting on
the top end of the VX500. If the VX500 still shows
PUMP FAULT, the filter is not properly seated, the inlet
cap is not tight, or the pump has failed.
C
R
LEANING AND
EPLACING THE
The function of the PID's detector is dependent upon
exposure of the gas sample to UV light via a precision
lamp. A critical component of this lamp is its wavelength
filter, or window. This window is the portion of the lamp
directly exposed to the gas sample, and is therefore
potentially exposed to water vapor, dirt, debris and oil
residues. Because this lamp is used as a UV light source,
it is critical to understand that degradation of the lamp's
output will cause the detector to lose sensitivity, and in
extreme cases can limit the range of the detector. In order
to retain peak performance of the VX500 PID detector, it
is vital that the unit's UV lamp window remain free of dirt
debris and oil residues. When the window is contaminated
you must periodically remove these contaminants. Refer
to Figure 1 detailing the lamp's window.
The first step to preventing or decreasing lamp window
contamination is repetitive replacement of the VX500's
sampling filter (part number 17058157). Also be careful
when storing a spare lamp to avoid finger contact with the
window and do not attempt to clean the lamp with
compressed air (unless air source is oil and contaminant
free). It is virtually impossible to prevent all factors that
obstruct or degrade the UV lamp's window surface,
therefore as a recommendation a 10.6 eV lamp should be
cleaned after every 40 hours of use, at any time when
readings are suspect, or if a calibration failure occurs.
PID L
AMP
23
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