M&C TechGroup CSS Series Operator's manual - Manual (Page 34)

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Gas sampling and gas conditioning technology 4-1.1-ME
21.2 COOLER ALARM/TEMPERATURE CONTROLLER ALARM
Cooler alarm is released if the cooler temperature is <2°C or >8°C, also
in the period till the CSS is ready for operation. As well cooler alarm is
released if the temperature controller (option) of the heated sample line
is out of range. The operative cooler/temperature controller opens the 3-
way solenoid valve and makes the function ‘Pump On’ possible.
For alarm elimination please check:

the function of the cooler; see separate manual 3-1.1-MD;

ambient temperature > 2°C ?

the function of the temperature controller; see separate manual 2-5.1.2-MD.
21.3 FLOW ALARM
The gas flow is adjusted by the flow meter FM1 and observed by an op-
tical bi stable flow alarm sensor. The sensor can be moved on the flow
meter glass and adjusted to any alarm value. The sensor recognises the
variation in direction of the ball in the flow meter. If the ball passes the
alarm limit in the direction of increasing flow rates the alarm is elimi-
nated. In opposite direction alarm is released.
Possible reasons for flow alarm are:

period till the CSS is ready for operation;

sample gas pump is out of order;

the flow rate is adjusted below the alarm limit;

cooler alarm/temperature controller alarm; the 3-way solenoid valve is automatically closed and the
sample gas pump is switched out of order;

liquid alarm; the 3-way solenoid valve is automatically closed and the sample gas pump is switched
out of order;
 the tubes are blocked so gas flow isn’t possible;
The following steps are possible to eliminate the flow alarm:

check if the adjusted flow rate is above the alarm limit;

check if the sample pump is switched on (see fig.2, LED green);

check if there is no other alarm; correction see 21.2 and 21.4

check if the gas can passes the gas tubes.
If the alarm can not be eliminated in spite of the above mentioned steps the electronic card LFC-2 has
to be checked.