Lutron Electronics PDO-519 Operation Manual page 13

This sensitive diaphragm is rather delicate & is easily
damaged if it comes into contact with solid objects or is
subjected to blows. If the diaphragm is damaged or the
electrolyte is run out, it must be replaced in the
following way :
1) Unscrew the " Probe head " ( 5-3, Fig 2 ).
2) Pour out the old Electrolyte from the
container of the " Probe head ".
3) Fill the new Electrolyte ( OXEL-03 )
into the container of the " Probe
head " .
4) Screw the " Probe head " ( 5-3, Fig 2 )
into the probe body.
Probe-filling Electrolyte,
OXEL-03
Probe head with Diaphragm set
5-1 Probe handle
5-2 Temp. sensing metal
5-3 Probe head
10
Fig. 2