TESTO 327 - Sensor calibration and cell replacement; Replacing measuring cells (327-2)

Maintaining the product22
➣
Calibrating the O
2
measuring cell (327 O2, 327-1):
After replacing an O
2
measuring cell, wait for an stabilisation period of 60
minutes to elapse before starting the calibration.
During the calibration, any flue gas probes that are connected must be in the
open air.
1 Press .
2 Select Sensors using / and confirm entry with the OK function key.
3 Select 0
2
-Sensor using / and confirm entry with + (press
simultaneously).
- Instrument performs calibration (30s) and is then ready for use again.
➣
Inputting cell coefficients for CO measuring cell (327 CO, 327-1):
If you do not enter the correct cell coefficients, you will get incorrect
readings! You will find the cell coefficients on the leaflet enclosed with the
spare measuring cell. If you enter incorrect coefficients:
❯ Abort the process using and enter cell coefficients again.
1 Press .
2 Select Sensors using / and confirm entry with the OK function key.
3 Select CO Sensor using / and confirm entry with + (press
simultaneously).
- The first number of the first cell coefficient flashes.
4 Press Change function key and set number using / .
5 Change to further digits by pressing the function keys one after the
other and confirm entry with OK function key.
- Instrument automatically changes to the second cell coefficient
6 Repeat steps 4 and 5. Confirm the input with the OK function key.
7 Complete the entry with the OK function key.
➣
Replacing measuring cells, testo 327-2:
✓ The measuring instrument must be switched off.
1 Place the measuring instrument on its front facia.
2 Loosen the screws with a cross-head screwdriver and remove service lid.
3 Pull hose connections from the faulty measuring cell.
4 Remove the faulty measuring cell from the slot.