KANOMAX 3900 Portable Particle Counter - Manual (Page 12)

2. Getting Started 5
2.3 Zero Check
If the internal optical system is dirty, you may not be able to perform an accurate measurement.
To confirm the cleanliness of the internal optical system, perform Zero Check before measuring.
Attach the standard inlet to the instrument.
Next, attach the zero filter to the standard inlet using the supplied Tygon tube.
The length of the tube is not critical. However, make sure that the tube is not
bent. (Approx. 60cm)
Follow the above procedure in order to prevent particles from entering the
instrument.
Perform a measurement for one minute and then perform Zero Check.
(Refer to 3.4 MONITOR for the operation procedure.)
Perform Zero Check at least once a day.
It is recommended a Zero Check be done before and after each measurement.
2.4 Isokinetic Suction Probe
Use the Isokinetic Suction Probe to ensure the sampling air velocity is
equivalent to the operating environment air velocity. This allows you to
perform a measurement without significantly disturbing the normal air flow.
Attach the standard inlet to the main body of the instrument.
Next, attach the Isokinetic Suction Probe to the standard inlet by using
the provided Tygon tube.
When using the Tygon tube, cut the tube to the most suitable for your
measurement requirements.