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MAINTENANCE GA-40 T plus

2 MAINTENANCE

2.1 Gas sensors

The following points are important for maximising the operational life of the cells and achieving measurements

without errors:

G do not exceed the rated concentration;

G all the gas cells may react unpredictably to the presence of substances which are not usually

found in flue gases. For this reason, the analyser may not be cleaned with chemical solvents.

If organic solvents enter the gas chamber, the cells may become unstable or even suffer

permanent damage;

G some cells require the presence of a bias voltage when not in use. Do not allow the battery to

become fully discharged;

G do not switch the analyser off before the system is purged of remaining flue gas;

G store the analyser in a cool place to reduce the ageing of the cells.

2.2 Gas system

The gas system of the analyser is protected by a heated filter. The filter element will become dirty with use and

should be changed when necessary. The water vapour present in the flue gases condenses in the cooler of the

dryer and is pumped out automatically.

2.3 Battery

The rechargeable battery used in the analyser is maintenance-free. An acoustic warning signal is given when

the voltage drops below 11 V. The GA-40 T plusplus will switch off automatically if the voltage drops below 10.5

V. The analyser will operate for about 5 hours from the battery.

{{ Some parts of the analyser draw current even when the device is switched off. If

the analyser is not being used then the battery should be charged fully at least

once a month.

2.4 Service intervals

The parameters of the electrochemical cells change with time, and therefore it is necessary to carry out a

service periodically. This service should include re-calibration of the gas sensors using test gases. The

recommended service interval is 800 operating hours or 6 months, whichever comes first. The analyser is fitted

with an operating hour counter and automatically shows when a service is necessary.

The operating time and the number of hours until the next service are shown in SERVICE/DEVICE INFO.

2.5 Errors during operation

The analyser checks all circuitry continuously. Should an error become evident, then this is signalled

acoustically and by the message "ERROR" on the screen. The error can be found shown on the screen

OPTIONS/SERVICE/CONTROL LIST.

2.6 Switching off after use

The operating life of the electrochemical cells is dependent on the usage of the instrument. The wear and tear

on the cells is greater when the cell is exposed to the gas for longer or the concentration is higher. The gas cell

is hence "used up" during measurements.

For this reason, the analyser should not be switched off until all the gas tubing has been completely

cleared of flue gases and the gas cells have been purged with fresh air for several minutes.

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Bacharach Gas Pup Instrucciones de operaciones Pagina 8