13
Error message
Error messages during the measuring operation
flashes
During the zeroing phase
SO2 D flashes
NO D flashes
COlow D flashes
COhigh D flashes
Before switching off
SO2 flashes
NO flashes
COlow flashes
COhigh flashes
After switching on/zeroing phase
SO2 A flashes
NO A flashes
COlow A flashes
COhigh A flashes
Error messages
Cause / Remedy
Permissible operating temperature exceeded.
The ambient temperature changes to non-
permissible values. Adjust ambient temperature.
Measurement of zeroing point not stable. Wait
until zeroing phase has been repeated.
If this is not successful, the measuring cell is
used up.
There is still flue gas in the instrument, or very
high concentrations were measured during the
last measurement, or the zeroing phase is
prolonged.
Cause: Insufficient flushing with fresh air after
last measurement or probe is located in the flue
gas.
→ Place probe in fresh air. If no change occurs
after repeated cycling of the zeroing phase,
there is a fault in the cell or the cell is used up.
Instrument distribution voltage becoming too low.
Charge rechargeable battery/change battery or
connect power unit.
There is still flue gas in the instrument, or very
high concentrations were measured during the
last measurement or the zeroing phase is
prolonged.
Cause: Insufficient flushing with fresh air after
last measurement or probe is located in the flue
gas.
→ Place probe in fresh air. If no change occurs
after repeated cycling of the zeroing phase,
there is a fault in the cell or the cell is used up.
LOW BAT
12
Input of SO2, NO, CO cell coefficient
The cell coefficient is located on the instruction leaflet of the
corresponding replacement measuring cell.
After entering the coefficients and confirming with the OK
button, you jump to the zeroing phase.
During the calibration phase you can jump to the zeroing phase
at any time by pressing the ESC button twice.
Keep the Print button and the Right button pressed down
simultaneously for 3 seconds during the capacity display.
Recalibration can be performed by Testo
service points, subsidiary companies and
agents.
SO2
°C
25.50
25.8
Select
decimal
points
Increase numeric value
Decrease numeric value
3 sec.
<3 sec.
Press Print and
Right buttons
simultaneously
Main menu
Battery
capacity
Cancellation of the calibration phase will
result in incorrect readings!
V 110
6.0
43
CAL.
CAL.
OK
Measuring menu
ppm
0
SO2
60 sec.
Zeroing phase
Maintenance
Changing the measuring cells
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