Siemens SITRANS LVL200E Інструкція з експлуатації Посібник з експлуатації - Сторінка 11
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MAN-100057
5 Maintenance and fault rectification
5.1
Maintenance
If the device is used properly, no special maintenance is required in
normal operation.
5.2
Exchange seals
If you want to loosen the lock fitting, e.g. to change the switching
point, you have to exchange the graphite gasket rings.
The numbers in brackets refer to the illustration under "Mounting".
Danger:
Before dismounting, make sure that the vessel is unpressurised
1. Loosen the fixing screw (6) and remove the locking bracket (4)
2. Loosen pressure screw (11)
3. Hold the tube of the sensor and loosen the terminal screws (3)
4. Pull the sensor out of the lock fitting
5. Unscrew the pressure screw (11) out of the mounting boss (7)
6. Screw the mounting boss (7) with a new resistant seal ring into
the thread of the vessel and tighten the mounting boss (7) on the
hexagon (SW 41 or SW 60)
7. Unpack the new gasket and graphite gasket rings. The graphite
gasket ring (9) is thin; the gasket rings (8) are a little thicker and
have a layer configuration.
Make sure that the rings are not damaged. If you are not sure, use
new rings.
8. First of all place one of the new gasket rings (8) into the mounting
boss (7). Then place the graphite gasket ring (9) on top. This is
followed by the second gasket ring (8)
9. Place the pressure ring (10) of metal to the gasket rings
10. Screw the pressure screw (11) with a view turns from top into the
mounting boss (7)
11. Clean the connection tube of the sensor and the surfaces of the
clamp (1) as well as the pressure screw (11) carefully and remove
grease, oil and dirt. Insert the sensor into the lock fitting. Slide the
tube into the requested position and hold it
12. Make sure that the sensor is in the correct position (height). The
height setting of the sensor also determines the switching point
13. Tighten the pressure screw (11) with a torque 70 ±10 Nm
(51 ±7 lbf ft)
14. Continue to turn the pressure screw (11) clockwise until the hexa-
gon surfaces of the pressure screw (11) and the mounting boss
(7) correspond (max. 1/6 turn)
15. Tighten the terminal screws (3) alternately. Make sure that the
gap between clamp and pressure screw is in parallel. Tighten the
terminal screws with a defined torque.
Lock fitting - Operating Instructions
11