Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 18)

Operational Theory
18 Teledyne Analytical Instruments
The Series 4040 Analyzer is composed of three subsystems:
1. Sample System
2. Detector Cell
3. Electronic Signal Processing, Display and Control
2.2 Sample System
The Analyzer contains three (3) separate isothermal chambers
controlled by individual PID temperature controllers, viewed just behind
the Front Panel. The three chambers, ‘SAMPLE’, ‘FID’, and
‘COLUMN’ are described below.
The Analyzer consists of a SAMPLE Chamber containing the 10-
port switching valve and 2 sample loops. The Analyzer also consists of
an ‘FID’ chamber containing the Flame, pressure regulators, pressure
gauges and flow restrictors. The ‘COLUMN’ is housed in a separate
‘COLUMN’ enclosure and maintained at a close temperature.
2.2.2 Input Porting
The Analyzer is equipped with ports for the introduction of air, fuel,
carrier gas, span, and sample gas. It is imperative that these gases are
supplied at constant pressures using two stage stainless steel diaphragm
gas regulators. The recommended pressure range is 30 to 60 psig.
However, the Span gas should be supplied at a pressure of 20 psig to the
restrictor fitting on the Span/Sample Manifold (optional) on the back of
the Analyzer.