testo 523 Bedienungsanleitung Seite 12

12 Maintaining the product
Replacing a a v v alve:
Unlock valve knob and open completely.
1
First pull out the two lateral socket covers, then remove
2
the protective cover.
Press lightly on the valve knob so that it is prevented
3
from jumping out.
Release the locking bracket by lifting and remove it.
4
Attention: The locking bracket consists of two
components (bracket
Remove valve knob with spring.
5
Unscrew valve screw (wrench size 14mm) and remove
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valve (consisting of valve piston
If necessary exchange valve piston and valve screw and
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replace the parts. Torque: 4.0Nm / 2.95ft*lb.
Place the valve knob over the valve and turn until the
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knob can be pushed into the housing.
Press the valve knob lightly into the housing and clip on
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the locking bracket (bracket and slide).
Place the instrument in the protective cover and press
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the edges into the clip fastening, then replace the two
lateral socket covers (observe left / right).
and slide ).
and valve screw ).