User Manual

6 Using the product
13
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. Switching the instrument on
> Press
[].
Zeroing the pressure sensors
Zero the pressure sensors before every measurement.
✓ All connections must be pressureless (ambient pressure).
> Press for 2 seconds key
[P=0] and execute zeroing.
6.1.2. Connecting the temperature sensor
Surface temperature sensor
An NTC temperature sensor (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling.