Teledyne 402REU - Hydrocarbon analyzer - Manual (Page 23)

3-5 Teledyne Analytical Instruments
Total Hydrocarbon Analyzer Installation
3.2.2 3.2.2 3.2.2 3.2.2 3.2.2 Sample Gas Sample Gas Sample Gas Sample Gas Sample Gas
An oil-free, metallic diaphragm regulator must be installed as close
to the sample point as possible. Use new tubing in the installation. The
output pressure of the regulator should be 30 psig, whenever possible, to
match the settings of other regulators on the support gas tanks; sample inlet
pressure must exceed the operating sample pressure by at least 10 psig and
provide at least 1 SCFH bypass flow. In any case, the zero and span gas
regulators should be set to match the sample pressure regulator—as the
back-pressure regulator within the analyzer ultimately determines the
sample flow to the detection cell. Refer to Chapter 4: Sampling.
3.2.3 3.2.3 3.2.3 3.2.3 3.2.3 Effluent Effluent Effluent Effluent Effluent
All the gases introduced into the detection cell vent from one fitting at
the rear of the analyzer. TBE/AI recommends that the cell be permitted to
vent directly to the atmosphere wherever possible.
If a vent line is required, the installation must include a drop-out pot
to collect the water that is formed by the burning of the hydrogen fuel. The
vent line must be constructed so that water and dirt cannot collect in it.
3.2.4 3.2.4 3.2.4 3.2.4 3.2.4 Sample Bypass Vent Sample Bypass Vent Sample Bypass Vent Sample Bypass Vent Sample Bypass Vent
The sample bypassed by the back-pressure regulation system vents
from a separate port at the rear of the analyzer. If a vent line is required, it
must be installed so that water and dirt cannot accumulate in it.
3.2.5 3.2.5 3.2.5 3.2.5 3.2.5 Fuel and Air Connections Fuel and Air Connections Fuel and Air Connections Fuel and Air Connections Fuel and Air Connections
The fuel used to provide combustion should be a gas mixture com-
prised of 40% H
2
and 60% N
2
. The fuel is mixed with air to provide a
combustion source for the analyzer. Connect the fuel and air sources to the
instrument according to the gas connection diagram included at the back of
this manual.
NOTE: For applications where the sample gas is hydrogen, the sample gas
is doubles as the fuel for combustion and is diluted with nitrogen.
Connect a nitrogen source (40 psig) to the fuel inlet port. See Figure
3-1.