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The float will rise in the validation rig. Hold the validation rig down
firmly onto the MicroBio sampling head or alternatively use quick
grip clamps (not supplied) to hold in place. The float should centre
on the circle printed on the glass tube indicating a flow rate of 100
litres per minute. Approximately 20 seconds should be allowed for
the float to stabilise.
NOTE: It is important not to obstruct the exhaust vents of the MB1
or MB2 sampler or the bottom of the glass tube of the flow rig
during the validation test.
If the validation kit does not indicate correct flow, first check the rig
is held firmly down and repeat the test. If the test fails a second
time, the sampler should be returned to Cantium Scientific Limited
or your local distributor for calibration. It is possible for users to
adjust the flow if required by turning the adjustment screw, located
as shown in figure 4, using the screwdriver supplied (5). The
adjustments should always be made slowly. Self adjusting will
invalidate the calibration certificate provided with the sampler.
Once adjusted, allow approximately 1 minute and observe that the
float remains predominantly within the 100 litres per minute circle.
There may be some occasional fluctuation of the float.
The air
sampler can now be considered validated.
If it is not possible to increase or decrease the flow rate to 100 litres
per minute, this may indicate a fault in the air sampler. For service,
contact Cantium Scientific Limited or your local distributor.
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