Warning Notice
EGM-4 Operator's Manual – Version 4.19
- 7 -
For maintenance instructions, see
(Hydrophobic) on page 52.
Very Important
If there is any risk of of water entering the EGM-4, you must protect the instrument by using
an external 3 µm hydrophobic filter (Part No. 10045-1) or water drop out trap.
We strongly
recommend using 3 µm filters as any other size may cause damage to the pump
. If a
water drop out trap is used, it should be regularly checked and emptied as required.
If condensation persists, it is then recommended that a PP Systems’ water vapor equilibrator
(Part No. 10049-1) is used (see picture below). This is constructed from a material that is
very permeable to water vapor but impervious to CO
2
. If this is placed in-line in the analysis
pipe at the sampling point, the water vapor concentration of the analysis air will be brought
close to ambient.
Part No. 10049-1 Water Vapor Equilibrator fitted to top of EGM-4
The problem may also be avoided by putting a suitable water drop out trap or drier in the
same position. Drierite (anhydrous Calcium Sulphate) is suitable.
DO NOT
use Silica Gel,
which also absorbs CO
2
.
Please note that any method used to remove excess water from the analysis
sample will render any humidity measurement incorrect.
If you have any questions whatsoever with regards to possible condensation risk,
contact PP Systems (See
PP Systems’ Contact Information
on page 7
PP Systems’ Contact Information
PP Systems
110 Haverhill Road, Suite 301
Amesbury, MA 01913 U.S.A.
Tel: +1 978.834.0505 Fax: +1 978.834.0545
Support:
Sales:
Service:
