biosystems PhD Lite User Manual

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Figure 2.5.2.1. Motorized sample draw pump and
probe assembly
2.5.2.2 Protective “low flow” shut-downs
If a protective pump shut-down occurs, the following
steps should be taken before the instrument is put back
into use:
1. Turn off the PhD Lite detector and disconnect the
sample draw pump.
2. Remove the sample draw assembly from the area
being monitored. Be careful to keep the sample
draw probe in a vertical position.
3. Examine the sample draw probe and hose to make
sure no fluids remain trapped.
4. Allow any trapped fluids to completely drain. (It
may be necessary to disconnect the hose or
sample draw probe before drainage can occur.)
5. Replace the filters in the sample draw probe as
necessary.
6. Re-attach the pump in fresh air and wait for
readings to stabilize.
7. Resume sampling.
Figure 2.5.2.2. PhD Lite with motorized sample draw
pump attached
2.5.2.3 Resuming diffusion monitoring
To resume diffusion monitoring, simply disconnect the
pump assembly from the PhD Lite. The audible and
visual alarms will be activated and the LCD will display
the message “Pump Disconnect”. Press the MODE
button to acknowledge the disconnection and resume
normal diffusion operation.
Pump Disconnected
Press Mode
2.5.3 Sample probe assembly
The sample probe handle contains moisture barrier and
particulate filters designed to remove contaminants that
might otherwise harm the instrument.
CAUTION: Never perform remote sampling
without the sample probe and hose 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 Lite.
Particulate contaminants are removed by means of a
cellulose filter. The hydrophobic filter includes a 0.1 µm
Teflon™ barrier which blocks the flow of moisture as well
as any remaining particulate contaminants.
Sample probe filters should be replaced whenever
visibly discolored due to contamination. A spare filter
replacement kit (Biosystems part number 54-05-K0401)
is included with every PhD Lite.

biosystems PhD Lite Specifications

General

Brand	biosystems
Model	PhD Lite
Category	Security Sensors
Language	English