Mettler Toledo InTrac 785 Instructions D'utilisation page 33

InTrac ® 785
InTrac ® 785
52 403 859
To replace the seals, proceed as follows:
1. Shut down the housing (see Section 4.4).
2. Remove electrode/sensor from the housing (see Section 4.5.1) and store as described in
the electrode/sensor Operating Instructions.
3. Remove the housing from the equipment (reactor, vessel, pipe) in which it is installed
(see Section 4.5.2) and place it on a clean working surface.
Caution! Never place or support the housing on the front ends of the centering spigot or
immersion tube (risk of damage).
4. Remove sensor support «1». Use a no. 30 spanner.
5. Pull adjusting ring «2» over the immersion tube «5» and remove
6. fixing screw «3» by hand or using a no. 38 spanner.
7. Pull entire guide unit «4» including the fixing screw «3» and the tension ring over the im-
mersion tube «5» and remove.
8. Remove the indicated seals with a fine hook. Ensure that the contact surfaces of the seals
are thereby not scratched.
9. Lightly grease new O-rings (set of seals) with lab grease!
Caution! No grease may be applied to the O-Ring in the immersion tube, as there is a
danger that grease could contact and adhere to the electrode/sensor tip (diaphragm/glass
membrane) when reinstalling the electrode/sensor, and have adverse effects on its func-
tion.
10. O-rings «6», «8» and «10» and guide ring «7» and carefully fit scraper ring with O-ring «9»
using an assembly tool (order no. 90 770 1790).
11. Pull entire guide unit «4» including the fixing screw «3» and the tension ring over the im-
mersion tube «5» in the order shown in the drawing above.
12. Pull adjusting ring «2» over the immersion tube «5».
13. Screw in sensor support «1». Use a no. 20 spanner.
© 07 / 12 Mettler-Toledo AG, CH-8606 Greifensee
33
Printed in Switzerland