Bench Testing a 4-20ma sensors with a Multimeter and No Power
HTML-код
- Опубликовано: 16 сен 2024
- You can test a 4-20mA sensor with a $10 multimeter and a portable power supply. Many times we swap out sensors while troubleshooting and need to test them later without connecting them to the control system. Most 4-20mA sensors are powered by 10 to 24 VDC so we can take the PLC Tools SIM-ALP2 in voltage mode and power them up. For this sensor, pin 1 is +power, pin 2 is the analog signal, and pin 3 is -power.
Get the full details of this lesson at controls.tw/yt...
The above links make these videos possible. Please use them!
Support these videos while you you learn: controls.tw/yt...
Subscribe to our channel www.youtube.co...
At 2:00 I misspoke. You touch the terminal #2, which is the only sensor wire left not connected, to the red lead of the multimeter. Thanks to Igor for the catch.
Wish I was the manufacturer of that blue wire! Making a killing in today’s 24 vdc control world. Nice video, Tim. Merry Christmas to you and your family!
Merry Christmas to you too!
Thanks Tim keep on doing your videos. IM trying to influence my son to learn PLC programming.
That is great James 👌
Simple explanation awesome work
Thanks a lot 😊
@@TimWilborne should have 1M subs your a legend! trying to get my head around industrial automation/basic plc etc very complex IMO, the bloke doing the programming for the factory I work at, doesn't know how much respect I have for him 🤣
@@vin3121 Maybe one day I will 😁
You make mistake in the end, saying that you connect red wire of instrument to wire 3. Correct is that red wire of multimeter is connected to wire 2, since wire 3 is minus.
You are correct. I misspoke.
Hello Tim, I hope you can answer this question, how do you track an output or input that is shorting to ground?
There are devices that will tell you how far away the break is, pretty fascinating. But I'm usually just going to pull a new wire.
any suggestions on a portable 24v power supply ? When I respond to callouts I always have in my truck a Phoenix Contact Trio 120v input, 24vDC output power supply. I can not remember what drives the FMR20s, but I'm certain 10vDC wouldn't be enough to drive power to the endress hauser FMX21 pressure transducers. I've got one of those portable simulators, but never used it as a portable solution.
Aren't a lot of cordless drills 24VDC?
@@TimWilborne I'm not entirely sure because the only ones I use are 18v milwaukee batteries.
18VDC is enough to power most 4-20mA loops...sounds like it is time for me to do a video experiment :)
@@TimWilborne Yeah, I'm going to be trying this out...
Well my test didn't go very well and want to make sure you don't do the same thing. I tried just plugging a battery into my trainer and didn't think about that backfeeding the power supply. It didn't like it so definitely don't end up in a situation where you parallell the battery and another power source.
Where can I buy this Multimeter in South Africa
Any meter that measures milliamps will do. Here is a video on meter selection.
ruclips.net/video/1IGN3fPKyDo/видео.html