6 Using the product
15
WARNING
Tighten the valve actuator only hand-tight. Do not use any tools for
tightening, this could damage the thread.
WARNING
Valve positioner tightened too tightly.
• Damage to the PTFE seal (1).
• Mechanical deformation of the valve piston (2) leading to the
PTFE seal (1) falling out.
• Damage to the thread of the threaded spindle (3) and the valve
screw (4).
• Broken valve knob (5).
Tighten the valve positioner only hand-tight. Do not use any tools
to tighten the valve positioner.
6 Using the product
6.1. Preparing for measurement
6.1.1. Connecting temperature probe, Testo 552 and
accessories
Sensors must be connected before the measuring
instrument is switched on, so that they are recognised by
the instrument.
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