AO2000 -LS25 Laser analyzers - ABB

Date: Oct 19, 2024 Views: 26

　　Use in potentially explosive atmospheres in accordance with ATEX and IECEx ... Use in ATEX / IECEx Zone 1

　　Housing purge control flow

　　The power supply of the gas analyzer is provided via the purging and monitoring unit of the housing purging.

　　• The power supply to the gas analyzer may only be released from the purging and monitoring unit after the successful initial purge.

　　• The purging and monitoring unit monitors the overpressure inside the housing and de-energizes the gas analyzer if the level is below the minimum overpressure (e.g. due to a leakage or purge gas supply failure).

　　Sequence of the purging and monitoring unit The gas analyzer is powered from the purging and monitoring unit, i.e. the purging and monitoring unit prevents the gas analyzer from being energized before the purge is completed.

　　The flow sequence of the purging and monitoring unit is as follows:

　　1. After the start of the sequence, the purge gas flow and overpressure in the monitor are monitored by the purging and monitoring unit.

　　2. If the minimum flow rate of the purge gas and the overpressure are within the specified limits (see Purge parameters for pressurized enclosure on page 10), the purge timer (initial purge time) can be started;

　　3. After the initial purge time has elapsed, the power supply is released for the gas analyzer.

　　4. In the event of an error in one of the sequence steps, the controller must be set up to be reset to the beginning.

　　This sequence is presented in Figure 4.

　　Each state of the system is defined in response to the inputs of the monitor. The states are unique. Transitions between the states are only allowed along the paths defined by the arrows and towards the arrows.

　　The logical conditions for each state are defined by the following boolean logical expressions:

　　Use in potentially explosive atmospheres in accordance with ATEX and IECEx Use in ATEX / IECEx Zone 2

　　Introduction

　　This part of the Operating Instruction contains information of installation, operation and maintenance of the analyzer, ATEX Zone 2 version.

　　A Non-hazardous area B Hazardous area (ATEX IECEx Zone 2)

　　1 Power supply TRACO POWER TEX120, either in ATEX Zone 2 or outside the hazardous area

　　2 Power supply Pepperl+Fuchs PSC2.PS.GR.18.36.17.D-Y0168136, either n

　　ATEX /IECEx Zone 2 or outside the hazardous area

　　3 Transmitter unit

　　4 Connection box

　　5 Cable glands

　　6 Purge gas connections

　　7 Receiver unit

　　The analyzer consists of three separate modules:

　　• Transmitter unit with purge fittings and connection box with terminals for the connection of mains and signal cables as well as optional inputs.

　　• Receiver unit with purge fittings.

　　• Power supply unit (either TRACO POWER TEX120 or Pepperl+Fuchs PSC2.PS.GR.18.36.17.D-Y0168136)

　　Standards and directives

　　All gas analyzer models comply with the regulations of the

　　European Directive 2014/34/EU (ATEX Directive) / IECEx

　　scheme, and they are manufactured in accordance with the

　　following standards:

　　• EN/IEC 60079-0

　　• EN/IEC 60079-15

　　• EN/IEC 60079-28

　　• EN/IEC 60079-31

　　The gas analyzer must be designed, installed and operated in accordance with the following standards and directives:

　　• EN/IEC 60079-14

　　• EN/IEC 60079-17

　　• EN/IEC 60079-19

　　Note

　　The full designation of the applied standards, including the date of issue, is included in the declaration of conformity supplied with the device.

OI_AO2000_LS25_EN_E.pdf

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