Sample Particulate Filter; Hydrocarbon Scrubber (Kicker); Figure 10-9: M100E Hydrocarbon Scrubber (Kicker) - Teledyne 100E Instruction Manual

Theory Of Operation
flow rate of gas through the orifice is only related to the minimum 2:1 pressure
differential and not absolute pressure:
• The flow rate of gas through the sample chamber will be the same regardless of
whether the analyzer is at the bottom of Death Valley or on top of Pikes Peak.
• The flow rate of the gas is also unaffected by degradations in pump efficiency due
to age.
The critical flow orifice used in the Model 100E is designed to provide a flow rate of 650
3
cm /min.

10.3.3. Sample Particulate Filter

To remove particles in the sample gas, the analyzer is equipped with a Teflon membrane
filter of 47 mm diameter (also referred to as the sample filter) with a 1 µm pore size. The
filter is accessible through the front panel, which folds down, and should be changed
according to the suggested maintenance schedule in Table 9-1.

10.3.4. Hydrocarbon Scrubber (Kicker)

It is very important to make sure the air supplied sample chamber is clear of
hydrocarbons. To accomplish this task the M100E uses a single tube permeation
scrubber. The scrubber consists of a single tube of a specialized plastic that absorbs
hydrocarbons very well. This tube is located within outer flexible plastic tube shell. As gas
flows through the inner tube, hydrocarbons are absorbed into the membrane walls. and
transported through the membrane wall and into the hydrocarbon free, purge gas flowing
through the outer tube. This process is driven by the hydrocarbon concentration gradient
between the inner and outer of the tubes.
CLEANED
SAMPLE AIR
TO
SAMPLE
CHAMBER

Figure 10-9: M100E Hydrocarbon Scrubber (Kicker)

In the M100E some of the cleaned air from the inner tube is returned to be used as the
purge gas in the outer tube (Figure 10-9). This means that when the analyzer is first
started, the concentration gradient between the inner and outer tubes is not very large
and the scrubber's efficiency is relatively low. When the instrument is turned on after
174
CLEAN
PURGE AIR
FROM
VACUUM MANIFOLD
INNER
TUBE
(Ambient Air)
Model 100E Instruction Manual
OUTER TUBE
(Clean Air)
USED PURGE AIR
TO
PUMP
AND
EXHAUST PORT
SAMPLE AIR
FROM
PARTICULATE FILTER
045150102 Rev XB1