Kendro HERAcell 150, Руководство по эксплуатации

Страница: 43 / 251

CO
2
Incubator HERAcell ® 150 Operating Instructions
43
6. Handling and control
2. Enter the nominal value:
Depending on the requirements for the working process, two different O
2
con-
trol ranges are preprogrammed at the factory.
Control range I: 1 % - 21 %
Control range II: 5 % - 90 %
NOTE – Using of process gases
Fornom inalvalues below 21% O
2
, the device
must be connected to a nitrogen supply system.
For nominal values above 21 % O
2
, the device
must be connected to an oxygen supply system.
The nominal value can be increased or reduced in increments; if you keep the
key depressed, the UP/DOWN function switches to a rapid increase/reduction;
after approx 3 seconds, another increase/reduction occurs.
To increase the nominal value:
Press the + keys.
To reduce the nominal value:
Press the + keys.
3. Accept and store the nominal value:
Release both keys.
The O
2
display shows the current actual value measured in the work
space.
6.6 Disabling the O
2
control
If required by the application, the O
2
control can be disabled.
1. Set nominal value to the following minimal oxygen concentration:
• Control range I: < 1 % or > 21 %
• Control range II: < 5 % or > 90 %
Press the + keys or the + keys.
2. Disable the control:
Press the + keys or the + keys
The display shows that the control has been disabled.