AO2040-LS25 气体分析仪的电源

AO2040

Housing purge control flow
The power supply of the gas analyzer is provided via the purgingand monitoring unit of the housing purging.The power supply to the gas analyzer may only be releasedfrom the purging and monitoring unit after the successfulinitial purge.
The purging and monitoring unit monitors the overpressureinside the housing and de-energizes the gas analyzer if thelevel is below the minimum overpressure (e.g. due to aleakage or purge gas supply failure).
Sequence of the purging and monitoring unitThe gas analyzer is powered from the purging and monitoringunit, i.e. the purging and monitoring unit prevents the gasanalyzer from being energized before the purge is completed.
The flow sequence of the purging and monitoring unit is asfollows:
1. After the start of the sequence, the purge gas flow andoverpressure in the monitor are monitored by the purgingand monitoring unit.
2. lf the minimum flow rate of the purge gas and theoverpressure are within the specified limits (see Purgeparameters for pressurized enclosure on page 10), thepurge timer (initial purge time) can be started;3.After the initial purge time has elapsed, the power supplyis released for the gas analyzer.
4. in the event of an error in one of the sequence steps, thecontroller must be set up to be reset to the beginning.

The electronics module incorporates the system controller withthe l/o modules.
The system controller caries out the following functions:Processing and communicating the measured values suppliedby the analyzer module sensor electronicsCompensating measured values, e.g.cross sensitivitycorrection
Controlling system functions, e.g. calibration
Display and control functions
Controlling associated systems, e.g. gas supplyCommunicating with external systems
The system controller communicates with the other functionalunits of the gas analyzer (e.g. the analyzer modules) via thesystem bus.
Interfaces for controlling associated systems and for communi.cating with external systems are located on the system controlle(Ethernet 10/100/1000BASE-T interface) and on the VO modules.
The l/0 modules are attached and directly connected to thesystem controller board. There are various types of l/O modules:2-way analog output modules have two analog outputs.4way analog output modules have four analog outputs.
4-way analog input modules have four analog inputs.Digital l/O modules have four digital inputs and four digitaloutputs.
Modbus modules have one RS485 and one RS232 interfaceProfibus modules have one RS485 and one MBP interface(not intrinsically safe).
Examples of lO module applications include:Output of measured values
Output of status and alamm signals
Calibration contro
Control of external solenoid valves and pumps
Measurement range switching and feedbackFeed of current or status signals from external analyzersFeed of status signals from peripherals