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For chasing flow problems, there is a possibility to avoid any involvement of the PC

and of the microcontroller, by setting a jumper on the HF-42. To do this, move the

jumper of J3 from A1-A2 to B3-B4.

Fig. 5: HF-42

Fig. 6: Jumper position for gas saving mode

Remember to set the jumper back if gas saving operation is required.

Fig. 7: Jumper position for continuous flow

In this case there is continuous flow when the mains power switch is on Position 2.

Pos: 5.7 / 00 20 Ü bers chr ift en/E LTR A 1.1 Ü bers chr ift en/ 11 H ohe Ko hle nstof f Er ge bnis se s ind unr egel m äßig ELT RA @ 6 \mod_1368522482685_9.docx @ 40088 @ 33 @ 1

3.3 16BHigh carbon results are erratic

Pos: 5.8 / 00 10 ELTR A/0 015 s er vice _i nstr ucti ons /CS- 800_ Ser vic e/0 015 Fehl er/ 012 0 M odul Unr eg elmäß ig e K ohlen st off Erge bnis se ELT RA @ 6\ mod_1377688598908_9.docx @ 46519 @ 32333333444444 @ 1

Even if the filter may be brushed and cleaned in ultrasonic cleaner, someday will

not be able to be cleaned any more. Filters don’t last forever.

Check by removing the filter housing with the dust filter in it.

Don’t remove the filter from its housing.

Turn the filter housing upside down and try to blow air through the small 16mm

hole (about 16mm diameter) of the filter housing.

If you feel a remarkable restriction, replace it by a new one. With a new filter the air

should pass practically free without restriction.