How to Clean a Micron Gauge
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To prevent contaminants from getting into the micron gauge in the first place, we recommend attaching your micron gauge to a core removal tool (CRT) in a way that allows the gauge to sit upright. When the gauge is upright, oils and contaminants are less likely to get in through the bottom. Some technicians will even use a configuration of 3 CRTs to make sure they can connect the micron gauge in an upright position.
You can clean your micron gauge by removing the cap and applying isopropyl rubbing alcohol to the port of the micron gauge through an eyedropper, pipet, or eyedrop container (but be sure to label the container if you use one of those). According to Jim Bergmann, you may even choose to use a high-quality contact lens solution to clean the port. Then, you cap the port, tip the micron gauge, and shake it lightly. After shaking the micron gauge for a little bit, you can reopen the cap and pour the alcohol or cleaning solution out of the port. You can repeat this process a few more times until the micron gauge is clean.
When you think the micron gauge is fully clean, you can wipe it down with a rag and put it back into service.