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3.3 Cautions before starting the measurements
3.3.1 Location
This product is designed and produced for the operations in clean room environment. Please refrain
from using in the dressing room of clean suits, or in the ordinary environment (e.g. offices, turnery,
outdoors, smoking rooms etc.)
It will contaminate the internal components and increase the maintenance frequency.
3.3.2 Connection of sampling tube
Connect the sampling tube to air inlet for the collection of the air at distant place.
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Requirement for sampling tube
―
■
Material
Material of tube should be metal (stainless, copper, alloy steel), glass or synthetic resin
which will not generate the plastic deposit.
■
Length, Inner Diameter
Long or narrow sampling tube may be bent or pinched, causing pressure loss or clogging,
which will damage the vacuum pump and increase the maintenance frequency.
It also causes the deposit loss of particles and lowers the accuracy of measurements.
Length of sampling tube must be less than 1m and the inner diameter must be over 1/4 inch
(
φ
6.4mm).
■
Pressure Loss
Large pressure loss will prevent the instrument to maintain the 0.1cfm (+/-10%) flow rate.
Pressure loss at sampling tube must be less than 1kPa (approx. 100mmH
2
O).