KROHNE PTD 500 EN - Manual (Page 4)

4 Installation and Operating Instructions PTD 500
1 Installation
1.1 Mechanical installation
• Use only the recommended sleeves or adapters. If other systems are used, no guarantee can
be given for proper functioning or leak tightness.
• Before installing and dismantling the sensor, make sure that the system is non-pressurised!
• Do not use Teflon or paper gaskets.
• Insert the measuring head with care and straight into the sleeve. Screw the sensor in by hand.
Then tighten down using an open-end wrench applied to the hexagon (jaw size 41) with a
torque between 20 and 30 Nm.
• On no account may a tightening torque be applied anywhere else other than at the hexagon!
• Following assembly, the position marking of the sleeve points to the outgoing cable and the
filter cover for the air vent. When welding in the sleeve, please bear this in mind for suitable
positioning.
1.2 Process connection
The hygienic G1“h process sleeves are easy to weld into tanks or pipes. The marking points to the
centre of the future position of the cable glands or M12 connector. This form of assembly allows
installation in conformity with standards of hygiene (to EHEDG, 3A and FDA).
Various hygienic adapter sleeves (see Accessories) are available for fitting to other process
connections. The device can be installed in any desired position.
1.3 Electrical connection
• Installation of the device in the plant may only be carried out by an electrician. Observe the
national and international regulations for the installation of electrical systems and equipment.
• For voltage supplies, use a suitable power supply unit (EN50178, SELV, PELV) with a voltage
of between 16 V and 30 V.
• Disconnect the plant from supply before connecting up the devices.
• Do not loosen or detach connections when energised.
• To avoid adverse effects due to interference voltages, a shielded cable is recommended if
there is any greater distance between sensor and display.
• The sensor operates as a 2-wire device (current sink). Normally, connection of cables L+ (1)
and I - (2) will suffice, see connection diagram 1.