OPERATION OF ACCESSORIES
3-4
3.2 Water Trap Filter
The external water trap/dust filter is made of a PTFE (Teflon
®
)
membrane with a 0.2 micron pore size to prevent liquid water
from being sucked into the sensor manifold, which would cause
extensive damage to the monitor. It also prevents dust from
entering the monitor and prolongs the sensors’ operating life.
To install the water trap filter, slide the Tygon tubing onto the
ribbed inlet port of the monitor. A male Luer connector fits into
the female Luer of the filter. To remove the filter, disconnect the
Luer connector.
There are some vapors that are especially reactive or easily
absorbed by instrument surfaces; they include, but are not
limited to: Cl
2
, PH
3
, NH
3
, HCN, and semi-volatile organic
compounds like diesel fuel and jet fuel. For these compounds
the high pump speed setting should be used. (See Section 2.9
Integrated Sampling Pump) It is also more desirable to use
inert connecting and sampling tubing, such as Teflon
®
instead
and to make tube connections as short as possible.
