User`s guide

M3000A/M3046AM3015A/M3016A Service Guide
1-46 Introduction to the Instrument
%ORFN'LDJUDPRIWKH6LGHVWUHDP&2

PHDVXUHPHQW
7KHRU\RI2SHUDWLRQIRU0$VLGHVWUHDP&2

Sidestream CO
2
is measured based on non-dispersive infrared absorption of breathing gas
samples. Signals progress through the circuit as follows:
)ORZ6\VWHP
The flow system circulates the sidestream gas sample and pumps out waste gas.
7HPSHUDWXUH6HQVRU
The temperature of the detector is measured and used to compensate temperature drift of the
CO
2
reading. Signals from the temperature sensor in the detector are amplified and then
passed through an Analog-to-Digital converter.
([FLWHUDQG,QIUDUHG6RXUFH
The exciter generates a high frequency, high voltage signal to ignite the infra-red source and
to generate the infrared radiation needed to measure the CO
2
concentration in the
measurement cell.
'HWHFWRUV
The detectors are used to detect the reference signal (the signal which comes directly from
the IR source) and the main signal (the signal which passes through the sample cell).
*DV,QOHW
ZLWK
2SWLFDO
&RGH
5HFRJ
QLWLRQ
6HULDO
LQWHUIDFH
ZLWK
)(/3
([FLWHU
,5
6RXUFH
'HWHFWRUV
DQG
7HPS6HQVRU
)ORZ6\VWHP
3XPS
VROHQRLG
WXELQJ
&RQWUROOHU
DQG
3HULSKHUDOV
$QDORJ
6HFWLRQ
3UHVVXUH
6HQVRU
*DV2XWOHW
6DPSOH/LQH,QOHW
WRIURP6HUYHU