50
LCD display indicates that the pump is attached and
in normal operation.)
The sample draw pump includes a unique pressure
sensor designed to protect the PhD Ultra from
exposure to water or other liquids. If there is a
change in pressure in the sample draw assembly
due to fluid intake, the pump immediately shuts
down. After a few seconds audible and visual
alarms indicating a low flow condition will also be
activated.
CAUTION
:
Never perform remote sampling
with the PhD Ultra without the sample probe
assembly. The sample probe handle contains
replaceable filters designed to block moisture
and remove particulate contaminants. If the
pump is operated without the probe assembly in
place, contaminants may cause damage to the
pump, sensors and internal components of the
PhD Ultra.
Procedures for proper use of the motorized
sample pump are contained in Chapter 2.
Replacement of sample probe filters is
discussed in Section 2.4.3.1.
As an additional safeguard, the pump also contains
an internally housed particulate filter. If the pump is
operated without the sample probe assembly in
place, or in particularly dirty atmosphere, this
internal filter can become clogged and periodically
require replacement. Standard accessories
included with every 54-05-A0101 motorized pump
include a package of 10 replacement 61-001 filters.
5.4.1 Internal pump filter replacement
Use the following procedure for replacing the
internal pump filter:
(1) Remove the three bottom screws from the pump
assembly and disassemble the upper and lower
sections of the pump case as shown in
Figure
5.4.3.
(2) Remove the two pieces of tubing from the filter
cap by gently twisting and pulling until the ends
are free.
(3) Remove the filter cap and replace the used 61-
001 filter.
(4) Reattach the filter cap and tubing. Make sure
the tubing is secure to the filter cap
before
reassembling the pump case.
(5) Reassemble the upper and lower sections of the
pump case. Do not over-tighten the three
screws!
Proper pump operation must be verified before
the pump is put back into service.
Use the following procedure to verify pump
performance:
(1) Attach the pump to your PhD Ultra and turn the
instrument on. Wait for the instrument to
complete the self-test sequence.
(2) Verify that the pump is operating normally, and
that a flashing “P” indicating proper pump
performance may be seen in the upper left hand
corner of the instrument LCD.
(3) Remove the hose and probe assembly from the
pump (if currently attached) then cover the
pump inlet with a finger. If there are no leaks in
the internal pneumatics the pump should go into
a low-flow alarm and shut down, and the audible
and visual low flow alarms should be activated.
A message screen will identify that there is a
low pump flow condition. A second screen will
advise you to remove the blockage and press
“mode” to resume operation.
(4) Press “mode” to reset the pump and continue
the test.
(5) Reattach the hose and probe assembly. Cover
the end of the sample probe tube, and verify
once again that the pump shuts down and that
the low flow alarms are activated.
(6) Press “mode” to reset the pump and resume
normal operation.
Figure 5.4.1. Motorized sample draw pump and
probe assembly
Figure 5.4.2. Top and bottom views of motorized
54-05-A0101 sample pump case
