Care And Maintenance; Cleaning The Measuring Instrument; Replacing Measuring Cells - TESTO 335 Instruction Manual

I.

Care and maintenance

This chapter describes the steps and action required in order to keep the product func-
tioning properly.
See also Regular care , p. 18.
I.1

Cleaning the measuring instrument

If the housing of the instrument is dirty, clean it with a damp cloth. Do not use any
aggressive cleaning agents or solvents. Weak household cleaning agents and soap
suds may be used.
I.2

Replacing measuring cells

A slot bridge (0192 1552) must be inserted in slots which do not have a measuring cell.
Used measuring cells must be disposed of as special waste!
Retrofitted measuring cells: The enclosed cell heating unit is not required for testo 335.
The measuring instrument must be switched off.
1 Place the measuring instrument on its front.
2 Remove the service cover: Take hold of it at the markings (arrows) using the index
finger and thumb, press slightly, fold up and remove.
3 Pull tube connections from the faulty measuring cell/bridge.
4 Remove the faulty measuring cell/bridge from the slot.
Do not remove shorting jumpers/auxiliary circuit
boards of the new measuring cells until immediate-
ly before installation. Do not leave the measuring cells
without a shorting jumper/auxiliary circuit boards for
longer than 15 min.
CO, CO , NO2, SO2 measuring cells:
low
Remove the shorting jumper.
NO/NO measuring cells:
low
Remove the auxiliary circuit board.
I. Care and maintenance
I.2 Replacing measuring cells
47