Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2
4-9
An external pump comes as standard equipment. The Pump Pack includes a vacuum pump and
ozone scrubber. It is supplied with 0.25" tube fitting to connect to the exhaust fitting on the
M200AH rear panel. See Figure 2-4 for hook-up information. The pump pack is turned on by
plugging the power cord into an AC outlet, see Figure 4-3.
The pump is supplied as standard equipment, however if you are supplying a pump, it must have
the following characteristics:
1. The pump must supply 2 slpm at 5"Hg-A.
2. The ozone scrubber must remove all ozone from the analyzer exhaust.
3. Connect the exhaust (Figure 2-4) to a pump with a <3 m length of 1/4" O.D. PTFE tubing.
Failure to meet the performance specifications will result in poor analyzer performance, damage
to the pump, damage to the analyzer, and may jeopardize warranty repairs. Teledyne API
strongly recommends that the factory supplied pump be used with the M200AH.
NOTE
On vacuum vs absolute pressure:
Many vacuum gauges read relative to ambient pressure, therefore
a reading of 25" of mercury (Hg) at sea level (which would give an
absolute pressure of about 5" Hg in the reaction cell) would read
only 20" Hg at high altitude sites. Therefore in this manual the vacuum
specification of 5" Hg pressure is given as an absolute pressure
- 5" Hg-A - reference against zero absolute pressure (a perfect vacuum)
thus removing ambiguities for high altitude sites.
A 47 mm diameter sample filter is provided as standard equipment to remove particulate matter
from the sample gas. It is important that the filter be maintained at regular intervals because
particulates trapped on the filter have been shown to alter the concentration of the sample. A
suggested schedule is shown in Section 8 - Maintenance. It should be noted however that more
or less frequent maintenance may be required depending on the situation.