11
Changing the CO
low
measuring cell
Before fitting the new CO
low
measuring cell, carefully
remove the short-circuit springs from the contacts.
- Remove measuring cell from the measuring chamber cover
and attach new measuring cell.
Short-circuit
spring
CO
low
measuring cell
Changing the SO
2
, NO, CO
high
measuring cell
- The measuring cell is located in the measuring chamber.
Remove measuring cell and insert new measuring cell. When
fitting, observe the guides on the measuring cell and the
measuring chamber.
-
Before fitting the new SO
2
,NO/CO
high
cells, remove the
short-circuit springs carefully from the contacts.
Assembling the
testo 325-I
- Place measuring chamber cover on the measuring chamber.
Tighten the fastening screws (3 pieces).
- Connect mounting block to the electronics.
- Place mounting block and electronics in the top section of the
housing.
- Fix the mounting block and the electronics to the top section
of the housing with the mounting screws (2 pieces).
- Attach bottom section of housing and close in the opposite
direction to the arrow.
Note:
Do not let keypad ribbon cable get caught.
- Fit fixing plate and insert filter.
- Attach condensate trap. Listen for the engagement tone.
- Insert batteries/rechargeable batteries and close with battery
compartment cover.
- Remove NO filter from the measuring chamber. When
inserting the new filter, ensure that the surface with the
boreholes is positioned downwards in the measuring
chamber.
Maintenance
Changing the CO
low
measuring cell
When a CO
low
-measuring cell is changed, the NO-filter
must also be replaced.
10
Before touching the electronics, discharge any static
electricity from your own body.
Avoid touching the electronics.
Battery compartment
cover
Condensate trap
Fixing plate
Measuring
chamber
CO
low
measuring cell
Fastening screws
NO filter
Filter
Mounting block
SO
2
, NO,
CO
high
measuring cell
Measuring chamber
cover
Board
Mounting screws
1.) Remove hose connectors from the flue gas probe, as well
as the power unit of the
testo 325-I
.
2.) Empty condensate trap before removing.
3.) Unlock condensate trap and remove from the housing.
4.) Remove filter insert (see page 8).
5.) Remove fixing plate with a screwdriver.
6.) Open battery compartment and remove
batteries/rechargeable batteries (see page 8).
7.) The housing of the
testo 325-I
is opened by
moving the housing sections in the direction
of the arrow (see diagram).
8.) Remove bottom section of housing.
9.) Loosen mounting screws (see diagram).
10.) Remove mounting block with the electronics
from the top section of the housing (see
below).
11.) Remove mounting block from the board.
12.) Loosen fastening screws (3 pieces) of the
measuring chamber cover. Remove cover.
Fixing plate
Bottom of housing
Top of housing
Mounting screws
Maintenance
Changing the measuring cells
