The brass circle through which the piston exits is in fact a sinter bearing - designed to hold oil (expert eye in our workshop, pers comm.).
Placing a drop of light machine oil on this got mine working again. I did the same preventative action for all other actuators in the lab too
Hope this helps
We have a Conflo III, and the actuator that moves the Ref 1 capillary up and down is sticking. As a result, when running N2 on/offs, my N2 reference peaks are sometimes non-existent, and sometimes just a quick spike. The arm goes down in steps (not smoothly), and quite slowly (takes ~5 seconds to get all the way down), but comes back up as it should. The ref 2 actuator is working fine, and CO2 on/offs look fine. I’ve tried increasing the compressed air pressure, but that didn’t help. Is there any sort of maintenance I should try (lubrication, replacing seals, etc.), or is it likely that I need to replace the actuator? Does anyone have advice on suppliers (It’s made by SMC Pneumatics, model C85N8-25S)? Thanks for your help.
Rebecca E. Plummer
Contractor, Code 6114
SAIC/Naval Research Operation
e-mail: [log in to unmask]