Operator's manual

Gas sampling and gas conditioning technology 4-1.1-ME

21.4 LIQUID ALARM

The M&C liquid sensor alarm unit LA1 is useful whenever liquid can

damage a gas analyser system. This may occur if a gas dryer unit or a

drain system fails.

The M&C LA1 liquid sensor is constructed in the following way that any

droplets of liquid in the sample gas are attracted under gravity to the

sensor surface and even the smallest liquid droplets trigger a sure and

rapid alarm.

In the event of an alarm the liquid alarm sensor switches the sample gas

pump off and closes the 3-way solenoid valve for sample gas.

To eliminate the alarm carry out the following steps:

 switch the CSS off;

 disconnect the line to the analyser;

 open the sample gas inlet;

 check the hoses of the condensate pump SR25.1; if they are defective change hoses;

 switch power supply on and check the condensate pump if it works;

 let the condensate pump work, until no more condensate is conveyed;

 dismount the LA sensor;

 dry the sensor;

 remove the filter element from the gas filter FPF-0,1GF;

 before starting the CSS with sample gas the gas ways must be dry. For this the CSS must be

sweeping about 1 hour with ambient air. The filter element remains dismounted and the sample gas

inlet and outlets remain open, disconnected from the system.

 install dry or new filter element.

If the elimination of the alarm is not possible in spite of the above mentioned steps you should check

the following components:

 gas cooler;

 electronic card LFC-2.