Seecode 20207 Handbuch Seite 13

When the screen shows "c" symbol now user blow to gas
entrance about 5 seconds.
2. If the first time warm up is failed the tester will repeat
warm up till the sensor is cleaned.
Note
It always has a large number of gas and impurity adsor-
bed on the surface of odor sensor, when first time taking
out the tester from the packaging, or after long time
no using for the tester, it need more time for cleaning
and warm up the sensor, you should repress the power
button and retry 3-5 times if possible.
If you blow and get 3-4 results, should be repress the
power button and retry 3 time till the sensor is cleaned.
Test
1. The"C "symbol is displayed with one beep sound when
warm-up is succeed, and the 9 to c countdown is started
that indicator the tester is in warm-up mode.