Operator's manual User Manual

Gas sampling and gas conditioning technology 3-4.20-ME

20.1 FUNCTION SEQUENCE OF THE EC30 CONTROL ELECTRONICS

Nine LEDs are available for error diagnosis of the EC30 control electronics to display all the logic and

alarm functions.

NOTE!

Do not change any settings that had been made at the factory!

 With the potentiometer P1 the temperature (zero point) is adjusted

(measuring points M1, M2)

 Potentiometer P2 figures the alarm < -25°C (measuring point M3).

 P3 is used to set the automatic time cycle (measuring point M4)

 The switch S1 is used for factory-made tests. It must always be set in

the higher position, ‘operation’.

NOTE!

It is essential to check the setting of switch S1 prior to initial start-up.

Start up is done by applying a voltage to the cooler unit:

 LEDs D7 and D10 light up red;

 LED D16 lights up green;

 The temperature of the low-temperature stages is > +0°C.

Once the pree-cooling stage  has reached +4°C after about half an hour:

Cooler stage  is activated;

After a short time the temperature of the low-temperature stage  < 0°C:

 LED D7 goes out.

After 1 hour total the temperature of the low-temperature stage  < -25°C:

 LED D6 lights up green;

 LED D19 - status all o.k.- lights up green;

 The status alarm contact is deactivated;

 LED D13 - timing cycle active - blinks red.

It is now ready for cooler operation. The sample gas flows through the pre-cooling stage  and the

low-temperature stage , after which an external release is done by the status alarm contact, so that

the external sample gas pump or a solenoid valve in the sample gas line can be controlled by the

alarm contact. After additional two hours, low-temperature stage  will likewise be activated:

 LED D17 lights up green.

After a short time the temperature of the low-temperature stage  < 0°C:

 LED D10 goes out.

After half an hour the temperature of the low-temperature stage  is < -25°C:

 LED D12 lights up green;

Three hours after low-temperature stage  was ready for operation, the solenoid valve will be

switched over to channel 2:

 LED D18 - solenoid valve channel 2 selected - lights up green;

 LED D16 - cooling ON channel 1 - goes out.