157 Measuring with Optical Dissolved Oxygen (DO) Probes
Smart Cap Replacement
When the cap approaches annual expiration, a warning screen notifies the user of required replacement.
Press
h key to read days remaining before expiration. When one year is reached the message will change
to “Cap Expired”. To maintain measurement accuracy Smart Cap replacement is mandatory.
Ensure all cap‑replacement steps are correctly followed.
1. Prior to cap replacement, verify time and date are correctly set in the controller setup menu.
2.
Turn OFF the controller or unplug the removable terminal connector marked PROBE by loosening the four
screws and reaching inside the enclosure.
3. Clean off probe body and dry off with cloth.
4.
Remove the expired Smart Cap from the probe by squeezing the cap at the cutout
arrow and pulling it off the probe body (do not twist).
5. Remove the used O‑ring by rolling it off the body.
6. Clean the O‑ring groove and lens with a soft tissue followed by the lens cleaning wipe.
7. Remove the new O‑ring from the container and slide on the probe tip (do not roll or twist the O‑ring).
8.
Use a syringe filled with silicone grease and sparingly lubricate the O‑ring with a thin film of grease. Avoid
getting grease or fingerprints onto the optical window.
9.
Remove the new optical cap from its container and align the cutout arrow on the Smart Cap with the
matching guide on the probe body.
10. Slide and press the Smart Cap onto the probe body until the cap snaps in place.
Once the cap is installed, it should not be removed unless a new cap is required.
11. Place the probe in purified water to hydrate the Smart Cap before use for a minimum of 2 hours.
12. Turn ON the controller or plug in the probe’s terminal connector and fully tighten the four captive screws.
13. Calibrate the probe and controller before reinstalling into the process.
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