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6.1.4 Installation of the temperature sensors
NOTE
The temperature sensors are to be installed symmetrically in the forward and return
line and preferably direct. The free temperature sensor can be installed in a ball
valve or in a pocket conforming to the requirements for this type of sensor. The
forward and return sensors must be inserted as far as the bottom of the pocket and
then fixed in position. For installation in a ball valve, a 5-piece coupling set is
enclosed with the meter in a separate bag. Bores in the flow sensor can be used for
symmetrical installation of the temperature sensors. In Germany, sensors up to
nominal pipe diameters of 25 mm are to be installed directly immersed.
If the temperature sensors are connected permanently, the cables must not be
shortened or lengthened. If replaceable conformity-marked temperature sensors are
used, the connecting cables must have the same length for the forward and return
line and not exceed 10 m; the cross-sections of the cables must comply with
EN 1434-2. They are connected to the marked Pt 100 or Pt 500 terminals in line with
the electrical compatibility of the integrator and finally sealed. The connecting cables
of the temperature sensors must be as short as possible. These cables are not to be
laid together with mains supply cables in cable ducts or cable racks. The minimum
separation of 50 mm for low-voltage cables must be maintained in accordance with
EN 1434-6.
Installation possibilities:
Installation in a ball valve with adapter (5-piece coupling set in separate bag)
Installation in a pocket
Installation in a ball valve with adapter
Use ball valves suitable for temperature sensor installation with M10 x 1.
1. Close the ball valve.
2. Unscrew the plug screw from the ball valve.
3. Place an O-ring from the enclosed coupling set on the mounting pin (Fig. AA, item 2).
Fig. AA Installing the temperature sensor