Télévac AN 3002 : Nettoyage des jauges passives à cathode froide 7B et 7E


This application note explains the process for cleaning the Televac® 7B cold cathode vacuum gauge and 7E cold cathode vacuum gauge.


1. Retirez le capteur de la chambre à vide.

2. Unscrew the cap to expose the anode assembly (to remove, rotate the cap counter clockwise).

3. Soulevez délicatement l'ensemble de l'anode vers le haut pour le séparer du corps.

4. Remove the “O” ring from the body, being careful not to scratch the “O” ring seat. Wipe it off with a lint-free tissue making sure that it is still intact (no cracks or tears). It should be round and not flattened.

5. Blast the entire anode assembly at 30 psi using 70-140 mesh glass bead abrasive, being careful not to damage the glass feedthrough. (If any rainbow effect is noticed on the glass bead, a crack in the feedthrough may exist and the anode assembly should be replaced (PN 2-6200-37 for the 7B and PN 2-7900-51 for the 7E).

6. Blast the body with glass beads concentrating on the pole piece and “O” ring areas. Clean the remaining internal parts. If the threaded end of the tube needs cleaning, it can be bead blasted as well.

7. After cleaning, blow out any residual glass beads or dust with dry air. See that all metal particles are removed from the pole piece areas.

8. Re-grease the “O” ring with Apiezon L or M Grease (a vacuum approved grease). DO NOT APPLY EXCESS GREASE, “O” ring should be shiny.

9. Install “O” ring in the body.

10. Replace the anode assembly in the body after the “O” ring has been installed. Observe the keyway location.

11. Screw on the cap and hand tighten.

12. Réinstaller dans la chambre à vide.

13. Allow several hours for the tube to degas when pumped down to high vacuum.

14. S'il est correctement nettoyé et assemblé, le tube de la jauge est prêt à être utilisé sans réétalonnage, sauf si un étalonnage traçable NIST
ne soit nécessaire.

Watch The Demonstration Video

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