Changing The Measuring Cells - testo 325-I Bedienungsanleitung

1.) Remove hose connectors from the flue gas probe, as well
Fixing plate
as the power unit of the testo 325-I .
2.) Empty condensate trap before removing.
Bottom of housing
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
Top of housing
of the arrow (see diagram).
8.) Remove bottom section of housing.
Mounting screws
9.) Loosen mounting screws (see diagram).
Before touching the electronics, discharge any static
electricity from your own body.
Avoid touching the electronics.
Mounting screws
Measuring chamber
cover
Mounting block
SO , NO,
2
Board
CO
high
measuring cell
NO filter
CO
low
measuring cell
Fastening screws
Maintenance

Changing the measuring cells

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.
Battery compartment
cover
Filter
Fixing plate
Measuring
chamber
Condensate trap
10
Changing the CO
CO measuring cell
low
Changing the CO
Before fitting the new CO
remove the short-circuit springs from the contacts.
- Remove measuring cell from the measuring chamber cover
and attach new measuring cell.
Short-circuit
spring
When a CO -measuring cell is changed, the NO-filter
low
must also be replaced.
- 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.
Changing the SO
- 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
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.
11
Maintenance
measuring cell
low
measuring cell
low
measuring cell, carefully
low
, NO, CO measuring cell
2 high
,NO/CO cells, remove the
2 high