1.1
SECTION 1 INTRODUCTION
1.1 Introduction
This manual contains the essential information regarding installation, operation and
configuration of the Servomex xentra 4902 and 4904 Continuous Emissions Analysers.
Complete details of the xentra hardware and full instructions for servicing by qualified
personnel only are presented in the xentra 4900 Service Manual. The service manual
may be ordered from Servomex using part number 4900002A.
WARNING
The user should note that the xentra 4900 instrument contains no user
serviceable parts inside. The instrument enclosure protects the user
from electric shock and other hazards. All servicing should be referred
to qualified personnel.
1.2 Glossary
FSD Full scale deflection, the maximum range over which a
measurement may be made ( see section 1.8 ).
DV Dead volume.
Top level menu The first menu, this leads on to a succession of other menus.
VARS Variables for each sensor.
UDEF User-defined data.
I1....I4 Internal gas sensor modules 1...4.
E1,E2 External analogue inputs 1 and 2.
Gfx Gas filter correlation infra-red.
Pm Paramagnetic.
1.3 General description
The Servomex xentra chassis is a platform into which gas sensor modules may be
fitted to make precise measurements.
Up to three modular gas sensors, for a wide range of gases and concentration levels
selected according to the customer’s needs, reside in the xentra chassis. The xentra
chassis provides power, gas connections and other support functions to the gas sensor
modules and receives their outputs from which it calculates sample gas concentrations.
The calculated gas concentrations then may be displayed on the LCD display screen,
directed to the analogue outputs and/or directed to the serial RS232 output.
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