Section 7
7-4
Maintenance
Caution!
Magnesium perchlorate is a strong oxidizing agent. Contact
with skin or mucus membranes may cause irritation. Avoid bringing it
into contact with acids and organic substances such as cotton, rubber,
grain dust, etc. Consult the container label.
Figure 7-1. Location of internal soda lime/desiccant.
7.4 External Soda Lime/Desiccant
The frequency with which the external soda lime/desiccant must be replaced
depends greatly on the mode in which the analyzer is operated, and how
much CO
2
and water vapor it is forced to remove.
In differential mode, with the scrubber tube connected to the chopper ports,
the soda lime/desiccant will need to be changed every 1-4 weeks, depending
on usage. Once the scrubber tube removes the initial CO
2
and water vapor
from the circuit, it will only need to remove the small amounts of CO
2
and
water vapor resulting from tiny leaks and diffusion into the system.
In absolute mode, the soda lime/desiccant will degrade more rapidly, since it
is purging CO
2
and water vapor from the reference cell continuously. When
measuring H
2
O in absolute mode, the external soda lime/desiccant will need
to be changed every 24-48 hours of operation. For additional information on
operating the LI-6262 in this mode, refer to Section 4.4, H
2
O
Absolute Mode
Caution
.
