Turning Off The Pump; Pump Low Flow Alarm; Sample Draw Probe; Calibration - Honeywell MultiPro Manual

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 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 center
of the LCD display. Low flow or other pump
fault conditions activate audible and visible
alarms and cause the display of the
appropriate explanatory message.
The pressure sensor in the sample draw
pump is designed to detect pressure changes
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while the sample-draw probe is being held in a
vertical position. If the probe is held
horizontally or at a low angle while inserted
into a fluid, a pressure drop sufficient to cause
the pump to shut down may not be generated,
and water could be drawn into the pump
assembly causing damage to the pump,
sensors and internal components of the
MultiPro.
CAUTION: Insertion of the sample draw
tube into a fluid horizontally or at a low
angle may lead to water ingress and may
cause damage to the sensors and internal
components of the MultiPro.
If the MultiPro determines that a significant
pressure change has occurred, it will go into
alarm and notify the user that there is a
blockage of the pump. The display will
alternate between the following two screens.
Remove the blockage and press the MODE
button to acknowledge the alarm and resume
sampling.
3.3

Sample draw probe

The MultiPro's sample draw probe is the
standard probe assembly from Honeywell
Analytics. The sample probe handle contains
moisture barrier and particulate filters
designed to remove contaminants that might
otherwise harm the instrument.
Particulate contaminants are removed by
means of a cellulose filter. The hydrophobic
filter includes a 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.
See section 5.7.1 for a probe diagram and
a list of available sample probe filter
replacement kits.
4.

Calibration

The accuracy of the MultiPro should be
verified on a regular basis*. Verification can
be as simple as performing a bump test,
which is described below in section 4.1.
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