Biosystems MultiPro Reference Manual - →
16
continuous "hands free" remote monitoring.
Use of the motorized sample draw pump
allows the MultiPro to continuously monitor
remote locations. The pump is powered by
the MultiPro battery. When the pump is
attached to the instrument, “PUMP” will be
shown on the display in the current gas
readings screen.
Note: The maximum amount of tubing
that can be used with the motorized
sample draw pump is 50 feet.
To ensure accurate readings while using
the continuous sample pump, it is
necessary to allow the pump to draw the
sample for one second for every one foot
of sampling hose plus an additional 45
seconds or until readings stabilize. For
example, with 10’ of tubing, it will be
necessary to allow a minimum of 55
seconds for the sample to be drawn into
the sensor chamber and for the readings
to stabilize.
MultiPro instruments are
designed to automatically
recognize the pump
whenever it is attached to
the instrument. If the
pump is attached when
the MultiPro is turned off,
the instrument will automatically initiate the
pump start up sequence when the instrument
is turned on. If the pump is attached while
the instrument is running, the MultiPro will
automatically initiate the pump test sequence
before returning to the current gas readings
screen.
3.2.1 Starting the motorized sample
pump
First attach the
probe and tubing
to the pump,
then secure the
pump (with the
sample draw
assembly
attached) to the
MultiPro by
inserting the tab
and tightening the knurled screw on the
adapter into the instrument casing.
Note: The sample probe assembly must
be attached to the pump when the pump
is attached to the instrument.
Once the pump is recognized, the pump test
sequence will be initiated automatically.
→
Block the sampling inlet by placing a finger
over the end of the sample probe assembly.
Once the blockage is detected, the MultiPro
will indicate that the test has been passed
and instruct you to remove the blockage.
Once the blockage is removed, it will proceed
to the current gas readings screen.
→
If the instrument is unable to detect the
vacuum resulting from the pump blockage
within 30 seconds, the test will fail, the
instrument will go into alarm and you will be
directed to remove the pump.
↔
Remove the pump and press the MODE
button to resume diffusion operation.
3.2.2 Turning off the pump
To turn off the pump, simply remove the
pump from the bottom of the instrument.
3.2.3 Pump low flow alarm
The MultiPro contains a pressure sensor that
continuously monitors for restrictions in
airflow caused by water or other fluids being
drawn into the unit and immediately acts to
turn the pump off in order to protect the
sensors, pump, and other MultiPro
components from damage.
CAUTION
: Never perform remote
sampling with the MultiPro 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 MultiPro
When the pump is active and functioning
properly, “PUMP” is displayed near the