Changing The Measuring Cells - TESTO 325M Instruction Manual

8. Maintenance
Pump Tool
Pump head
Membrane
Membrane
sensor
Flue gas pump
Measuring cell type
O2
CO ( )
testo 325M
CO/H (
testo 325XL
2
26
8 Remove membrane sensor and membrane from pump head
9 Clean removed parts and the pump plate with spirit or water.
10 Place membrane and membrane sensor in the pump head.
11 Attach pump head and remove Pump Tool.
12 Insert plug-in connection of flue gas pump and plug flue gas
pump into analyser (watch out cables don´t get caught!).
Reassemble analyser
1 Place bottom part of housing on top part of housing and put
back together again by sliding the two parts against each
other.
2 Attach fixing plate, filter and condensate trap.
3 Put in rechargeable batteries/batteries. Insert correctly (+/-)
4 Close cover on battery compartment.

8.8 Changing the measuring cells

Retained or saved (
instrument settings (Date / Clock...) are lost when the
Part no.
measuring cells are changed.
0390 0085
0390 0297
) 0390 0245
Opening the instrument
Proceed as described in the paragraph "Open instrument" in
the Chapter 8.6 Cleaning the flue gas pump, P. 25 and
continue as follows:
6 Remove the 3 screws at the back of the mounting block and
remove the mounting block from the upper part of the
housing
7 Carefully remove board with display from mounting block
Changing CO measuring cell in
The NO filter also has to be changed when the CO
measuring cell is changed!
Before doing so, carefully remove the short-circuit spring from
the measuring cell contacts of the spare measuring cell.
8 Remove defective CO measuring cell and attach spare
measuring cell to board
9 Remove filter holder and NO filter
chamber
the measuring chamber (perforated side of filter should point
downward).
testo 325XL
Print the readings which are still needed beforehand.
Only the original Testo measuring cells, listed opposite,
should be used.
.
, clip new NO filter into filter holder and place in
only) readings and
testo 325M
.
from the measuring
.
.