Environnement AF22e, Техническое руководство, Страница: 14 / 118

Environnement
S.A
AF22e
Duplication prohibited
MARCH 2017
1–6
1.1.2.5. Internal view
The internal components of the analyzer are accessed by simply unscrewing the single knurled screw
at the rear panel and sliding the upper cover.
The internal elements include (refer to Figure 1–5):

Sample inlet dust filter mounted on the rear panel (1),

Measurement module (2),

Pump (3),

ARM20 board (4),

Interconnection board (5),

24 VDC power supply unit (6), with automatic universal input voltage 100~250 Vac 50/60Hz.

Measurement board (7) that uses the + 24 V, + 12 V, + 5 V, +3.3 V power supplies. It supports
analog signal acquisition and digital signal processing.

Two pressure sensor boards (8),

UV lamp supply board (9),

Solenoid valve-filter assembly (13),

An optional permeation bench block (not shown).
After passing through the dust filter (1), the sample to be analyzed passes through an hydrocarbon
removing permeation tube, called the « carbon kicker ». The external carbon kicker tube is ventilated
with under-vacuum zero air provided by the activated carbon filter.
The sample is then sent into the measurement module (2) located in a 50°C temperature-controlled
enclosure.
This measurement module includes:

The UV lamp (11) supplied by the UV lamp board (9). The Interconnection board (5) controls a
chopper (12) allowing lamp beam interruption to measure the black photomultiplier current.

A reaction chamber where fluorescence takes place.

The detector unit consisting of a photomultiplier tube and a PM preamplifier board to measure the
emitted SO
2
molecules fluorescence.

The UV reference measurement unit consisting of one photodiode and the photodiode board. This
set measures the UV lamp light intensity.
A diaphragm pump (3) aspirates the sample. A restrictor controls the sample flow.