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Multimeter Troubleshooting: Your Guide to Accurate Diagnostics, Part 1
Episode 390
In our latest episode, we had the pleasure of welcoming back Tom Tinney, Product Specialist and equipment guru at AquaPhoenix Scientific. Tom shared invaluable insights into troubleshooting multimeters—an essential tool every water professional should have on hand during site visits. Here are some key takeaways from our discussion that you won't want to miss!
Why You Need a Multimeter: An Essential Tool for Your Kit Tom emphasized the importance of carrying a multimeter. "This is the tool that checks the controller to ensure you're delivering your products and services on site while you're not there. If you need to check its health or troubleshoot, you need a multimeter." Even a $12 model will suffice, so you won't stress about leaving it behind. This handy device can save you time and reduce anxiety, especially if it's misplaced.
Troubleshooting Power Issues: More Than Just Fuses A common scenario Tom encounters is technicians reporting that their controller is powered on but has no output. While it may seem like a blown fuse isn't the issue, controllers often have separate fuses for the relays. With your multimeter, you can quickly check for voltage on either side of the fuse.
If one side shows voltage and the other doesn't, it indicates a blown fuse. Tom's golden rule for troubleshooting fuses? Always bring three with you because "troubleshooting with fuses always takes three fuses, no matter what." After replacing a blown fuse, check if the controller powers up correctly or if the issue lies with the connected equipment.
Be Prepared: Stock Your Toolbox Tom recommends keeping spare fuses in the exact size you need in your toolbox. With fewer Radio Shacks around, it's essential to think ahead and replenish your supply. By having a fuse kit, you can avoid multiple service calls, saving both time and effort. When your fuse count dips below three, make sure to restock!
The Art of Checking Fuses: Don't Be Deceived! Sometimes, a wire may appear intact. To check for functionality, Tom suggests using the resistance setting on your multimeter. This method can confirm whether the fuse is operational. Listen for the reliable beep, indicating that current is flowing correctly.
When checking fuses, ensure you're measuring both sides for voltage. If it's absent, the fuse is blown. To confirm functionality, you can also switch your multimeter to resistance mode. If it beeps when touching the fuse leads, it's still conducting properly; if not, the fuse is blown.
Checking Conductivity Sensors Tom provided insights on verifying whether a conductivity sensor is functioning correctly. By measuring the AC voltage at the sensor tips, you can determine if it's working as intended. Remember, maintaining clean sensor tips is crucial for accurate readings—avoid using sandpaper Instead, use a loose-bristle steel brush to remove any buildup.
Conductivity Sensors Gone Bad Many users may regret learning how easily a multimeter can troubleshoot issues with conductivity sensors. Tom noted that when sensors are returned for warranty claims, they're often covered with white residue but still work perfectly fine 99% of the time after cleaning. If you want to learn how to clean them properly, he's more than willing to share his expertise.
The Tom Tinney Approved Method for Cleaning a Conductivity Probe Instead of sanding the carbon tip of a conductivity sensor, Tom recommends using a loose-bristle steel brush. This method effectively removes crusty buildup without damaging the sensor. After brushing, soak it in a 10% sulfuric acid, 1% murratic, or if you have time, you can even use a CLR solution to dissolve any remaining scale. Rinse tho
Published on 1 year, 2 months ago