I appreciate the amount of work you put in these video's. I have all the small calibrators you've mentioned never did thermocouple management, so I learned quite a lot. Thank you.
@three-phase56223 күн бұрын
Glad you found it useful, thanks for watching and commenting.
@Actual_electrical_content23 күн бұрын
d - please consider changing your user name, your current name makes it incredibly hard to search for you on KZbin but as a subscriber and as a none subscriber as it’s quite a common term , life recommend your channel to people and I allways end up sending a link as you can’t be searched easily , top video again
@three-phase56223 күн бұрын
Yeah, I think it was mentioned before. If you search for three-phase562, that is the handle KZbin have given me and it will find the channel. Thanks for watching and commenting.
@inothome23 күн бұрын
Interesting cold junction compensation method there. I've only used the internal CJC on the meters and the few PLCs with thermocouple inputs I've dealt with have the cold junction module for them. One of the cooler thermocouple things I have seen was at SpaceX's McGregor test site years ago. They had a lot of thermocouples hooked up to a rocket engine on the test stand and the Phoenix blocks were made of the same metals the wires were, so you didn't introduce any junctions to effect the temperature. These were local thermocouples connected to DAQ systems and ran the thermocouple wire all the way to the input on the DAQ. But of course you can't have a bunch of TCs with 400 foot leads, so they had the Phoenix blocks to connect too. First and only time I ran across that type of Phoenix block. Thought that was pretty cool and clever. Although probably pretty common knowledge if you deal with TCs all the time. Any TC I have had to replace I have had to run the whole length back to the PLC or controller.
@three-phase56223 күн бұрын
Using the interna compensation would be the usual way to do it, I just wanted to show what they compensation was effectively doing. If you have the luxury of using specific thermocouple types then you can use the compatible terminal blocks, but they are mighty expensive. Unfortunately, these little meters can measure multiple types of thermocouples, so they just have standard jacks and rely upon the cold junction compensation.
@inothome22 күн бұрын
@@three-phase562 Yeah, was interesting to see you do the cold junction and try to bring it to 0C.
@scottshaw131011 күн бұрын
Some great work there, detailing the testing of a global temperature system. When you factor in the uncertainty of measurement for just the meter and temperature sensor, its quite an eye opener.
@three-phase56210 күн бұрын
Yes, I do have a little chuckle when I have tight accuracy requirements with the transmitters and then you look at the actual sensor itself. In theory, the sensor should be linear though so you can calibrate out its discrepancy. Thanks for watching.
@scottshaw131010 күн бұрын
@@three-phase562 Perhaps that might be an interesting topic for a future video. The "global error" that is never referred to by manufacturers of sensor & transmitter systems is almost a science in itself! Applying uncertainty of measurement to measured data, and then trying to explain to non-technical customers was something I always found challenging!
@three-phase56210 күн бұрын
@@scottshaw1310 Added to the list, I will see if I can put something together. I have purchased a little HMI/PLC to play with so may be able to utilise that although I have to learn to program it first. Thanks for the idea.