User manual
500GD
MRU GmbH, D-74172 Neckarsulm
39 / 52
Setting Zeropoint
When taking a zero point, the measured CO
2
-value is set to 400ppm.
When the analyser is switched on, no new zero point is taken.
You can set a new zero, if it no longer 400ppm (350...500ppm) is
displayed in fresh air due to ageing or environmental conditions.
Leave the analyser in good fresh air for five minutes, if possible, without
changing the temperature. Now you can take a zero point. You can re-
peat a zeroing as often as you like.
► Select
„
Set Zero
“
.
Press
„
OK
“.
A window appears.
Zero point is set automatically.
Setting alarm threshold
►
Select „Alarm“.
►
Press
„OK“.
►
Set the desired alarm threshold.
►
Press
„OK“.
The alarm threshold is saved.
