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42/24-10 EN Rev. 9
Appendix 1: Gas Analyzer Overview
A-1-1
Appendix 1
Gas Analyzer Overview
Gas Analyzer
Components
The AO2000 Series Continuous Gas Analyzers consist of:
•
analyzer modules and
•
a central unit.
The central unit consists of:
•
the electronics module, consisting of the system controller, the I/O modules
(optional) and the power supply, and
•
the system housing with the display and control unit.
A gas module can be connected to supply gases to an analyzer module.
Equipment Levels
The smallest gas analyzer equipment level is made up of the central unit and one
analyzer module. Up to four analyzer modules for measuring up to six sample
components can be connected to a central unit.
System Housing
Electronics module, power supply and an analyzer module can be installed
together in one system housing. Additional analyzer modules are installed in
separate system housings.
Power Supply
A supply voltage of 100–240 VAC is required for the central unit. The analyzer
modules are powered with 24 VDC from the central unit power supply or from
separate power supplies.
System Bus
The system controller, the analyzer modules and the I/O devices are intercon-
nected via the system bus. The system bus is linear in design and has a maximum
length of 350 meters.
Interfaces
Various types of interfaces can be used by the gas analyzer to communicate with
external systems. These include an available Ethernet interface (TCP/IP protocol),
the RS232 and RS485 interfaces (Modbus protocol) as well as the RS485 and the
(non-intrinsically safe) MBP interfaces (Profibus DP or Profibus PA protocol).
Explosion Protection
Special gas analyzer versions are available for use in explosion risk areas:
•
The AO2060-Caldos15, -Caldos17, -Magnos106 and -Uras14 analyzer modules
in category 2G are designed to “Flame-proof Enclosure” (Ex d) ignition protec-
tion and are suitable for measurement of flammable gases and non-flammable
gases.
•
The AO2040-CU Ex central unit in category 2G is designed to “Pressurized
Apparatus with Leak Compensation” (Ex p) ignition protection.
•
The category 3G versions are suitable for measurement of flammable gases
(“safety concept”) and non-flammable gases.