LT GASETECHNIK
If two gas mixers are available, they can be automatically switched-over (e.g. on a adjustable weekly time-slice) to ensure a uniform load and the functionality of both gas mixers at the same time. This is easily possible with the gas mixer switchover from LT GASETECHNIK.
If a gas mixer has a fault or is in maintenance, the second gas mixer can take over completely. For particularly high demands, both gas mixers can work at the same time. For this purpose, both gas mixers are operated in parallel via additional pressure signals, if the gas mixture requirement is temporarily increased.
If the regular gas supply is disrupted, the system switches to an emergency supply (bottle or bundle station) with ready-to-use mixture.
Additionally, a redundant analysis system with double analysis, i.e. with two independent measuring cells, is installed. Two NDIR sensors continuously determine the CO2 concentration in the Ar/CO2 gas mixture. Each measuring cell is responsible for one gas mixer, thus an independent redundancy is ensured. The analysis results are displayed on the color display, integrated in the control unit. The gas analysis is monitored by means of solenoid valves with the measuring gas of the corresponding gas mixers and also has an automatic zero point and end point calibration.
During the switchover, the circumstance of a fault or of the automatic calibration is taken into account with priority circuit.
Switchover and gas analysis are controlled via a common PLC with touchscreen display. The display shows the operating state of the gas mixer one or two. For a quick overview, two indicators also show the currently activated gas mixer.
Messages such as
are transmitted to the central control room via a cable connection.
When switching over, the circumstance of a fault or automatic calibration with priority circuit is taken into account.
The analysis values are logged in the controller and can be read out as a CSV file via a USB slot on the front of the housing and processed with common software tools.
This ensures the necessary special safety in mixed gas supply and continuous gas mixture analysis to meet the highest quality requirements.
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