OPERATION OF ACCESSORIES
3-7
3.3 External Filter
The external 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 External Filter, slide the Tygon tubing onto the
ribbed inlet port of the monitor. A male Luer connector fits into
the female Luer receptacle of the filter. To remove the filter,
disconnect the Luer connector by unscrewing it.
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.
3.4 Remote Sampling Probe
A 5-meter (15
'
) length of Teflon
®
tubing is supplied as a
standard accessory with every the AreaRAE Steel detector. An
optional 6
'
Teflon
®
remote sampling probe with a telescoping
handle is also available for the user who needs to probe hard-
to-reach areas such as ceilings, storage tanks, underground
manholes, etc.
Connect the male Luer connector to the end of the remote
sampling probe or the Teflon
®
tubing to the female Luer
connector on the External Filter. The remote sampling probe or
the Teflon
®
tubing is ready for operation.
