User's Manual

7 Maintaining the product
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1. Open the filter chamber: turn slightly anti-clockwise (1). Remove
the filter chamber (2).
2. Remove the filter plate (3) and replace it with a new one (4
[0554 3385]).
3. Attach the filter chamber and lock it: turn slightly clockwise.
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7.10. Changing the thermocouple
1. Release the probe catch by pressing the key on the probe
handle and remove the probe module.
2. Remove the thermocouple plug-in head from the socket using a
screwdriver and pull the thermocouple out of the probe shaft.
3. Keep inserting the new thermocouple into the probe shaft until
the connection head clicks into place.
4. Fit a new probe module on the handle and engage in place.
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7.11. Updating the instrument software
At www.testo.com/download-center you can download the current
instrument software (firmware) for the testo 330i.
✓ The measuring instrument must be switched off.
1. Plug the measuring instrument mains unit into a mains socket.
2. Press and hold down for 10 s.
- Both status LEDs (blue/red) slowly flash alternately.
3. Insert the connecting cable (0449 0047) into the USB port on
the measuring instrument, then connect it to the PC.
- Your PC identifies the measuring instrument as a removable
medium.
4. Copy the new instrument software file (ap330ir.bin) to the
identified removable medium.
- Both status LEDs (blue/red) quickly flash alternately. This
process may take a few minutes.
5. Disconnect the connecting cable from the measuring
instrument.
- Once the instrument software has been updated, the measuring
instrument will automatically reboot and is ready for use again.