© PCE Instruments
8
4.2.2
Maintenance of the diaphragm
The Teflon diaphragm is capable of allowing oxygen molecules to pass through it, this is how the
oxygen meter can measure oxygen. However, larger molecules cause the membrane to clog. For
this reason, the diaphragm should be replaced if the meter cannot be calibrated despite a new
electrolyte. The diaphragm should also be replaced if it has been damaged by an impact.
The procedure for changing the diaphragm is similar to that for refilling the electrolyte.
Remove the black cap with the diaphragm from the sensor head. Clean the sensor with tap water.
Fill new electrolyte fluid into the new cap with the diaphragm (OXHD-04). Then screw the black
cap back onto the sensor and finally perform the calibration as described in chapter 3.1
4.3
Battery replacement
When the display shows this icon
, the batteries must be replaced to ensure proper
operation of the oxygen meter. To do this, open the battery compartment cover of the meter and
remove the old batteries. Then insert new 1.5 V AAA batteries into the meter. Make sure that the
polarity is correct. After the new batteries have been inserted, close the battery compartment.
