Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 16)

Series 4040
16 Teledyne Analytical Instruments
1.2 Principle of Operation
The sample is brought to a heated compartment (50 - 80° C per
application) and into a sample loop and a 10-port, 2 position (Position A
& B) switching valve. In valve Position B the carrier gas, nitrogen,
pushes the sample into a Column to separate methane from the
remaining hydrocarbons. The eluted gases are analyzed for methane in
the FID detector. In valve Position A, the flow through the Column is
reversed and the carrier gas pushes the sample into the FID to detect
NMH. The electrical output is directly proportional to the concentration
of the ionizable hydrocarbons present in the sample stream.
1.3 Analyzer Description
The standard analyzer is housed in a sheet steel equipment case
flush-mounted in a 19" rack. The front interface panel is mounted on a
door which, when opened, allows convenient access to the Analyzer
electronics. The entire front panel can slide out of the chassis to provide
greater access to the electronics and to the sample system. Gas pressure
and flow controls are mounted on the front panel adjacent to the LED
and VFD displays and user interface.
At the rear of the instrument are ports for the introduction of air,
carrier, fuel, span, and sample gas. A single 50-pin user-interface cable
connector contains input/output and alarm signals available to the user.
An RS-232 port is also available at the rear panel for connection to a
remote computer or other digital communication device. The Analyzer is
set up for either 120 VAC 60 Hz or 230 50/60 Hz operation depending
on the customer’s requirements. The appropriate power cord for your
unit has been shipped with this instrument.
1.4 Applications
• Monitoring the ambient air for methane/ non-methane in
chemical and petrochemical plants.
• Fugitive emission monitoring.
• Process emission gases in the chemical industry.
• Detecting trace methane/ non-methane in air.
• Detecting atmospheric pollutants.