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Tulsa Calibrations : PD Controllers

Hello I’m Travis hey this is Nate and we’re with precision calibrations we’re talking about Tulsa calibrations again as normal.

We were just talking about PD controllers and in chart recorders and cookies being burnt and and what’s what can we do to keep the cookies from being burnt. We’ve got to optimize the E-Man.

OK so the PD has got to be set right in order for the ovens to correctly get to temperature and not burn the cookies. So we were talking a little bit about the different parameters of the Ph.D. and we said that the ideas stood for proportion ban integral and derivative and these values are very important with the temperature controller because we want to want the furnace to maintain temperature accurately so when making aerospace parts or car parts or cookies cookies that’s the calibrations. That’s right. That things work correctly.

And so and so you know I mean there’s there’s more information that we can share about the how. You know we talk about the temperature uniformity surveys kind of how that works.

So how would you describe how the Honeywell two lines recorders display display light display might be kind of a misleading word but I mean it displays data. How does it make its chart. How do you read it. Yes.

The Honeywell true line chart recorder is one of those items that usually you find on the furnaces or ovens that we calibrate when we do the recorder calibrations and the display on that these things are pretty nice because they they basically draw their own chart. So there’s a piece paper that goes on the chart that’s blank. And once you’ve configured the true line chart recorder it enables you to decide what kind of a chart you want to have displayed on the paper. And this thing by using by using electrical impulses causing heat at the pin Bill will draw you a nice little chart and represents the temperature over time. So

during the process you can see the different temperatures over the different time frames something like that. Is there a is there. Can you name them anything you want to. I suppose you could. I suppose you could. Some people call them recorders.

Some people call them catalogers. No I’m at the pen itself could to be like Jack one and Jack too.

Oh pin one pin. I think that’s the more normal It’s called a pin I guess you never know what you’re going to find in Tulsa calibrations.

That’s right. Let’s see what else is important to have calibrated on those furnaces. I mean there’s a lot of natural gas going through and some of them have nitrogen going through them. What’s some of the things you would be concerned about I haven’t calibrated on them.

Well we work here in the Tulsa calibrations community and. And we don’t get blown up.

Yeah there are some things on the furnaces that have to be calibrated and the calibrations and so but mostly and primarily is just going to be the control system and the chart recorder.

And then also the the high limit which which the high limit is necessary on the oven to protect it protect the oven protect the process take the parts in the furnace or oven and personnel to make sure this furnace doesn’t just burn up gets too hot it will shut it down. Here’s what it does leave a jumper on it and you leave jumper on it. And that’s that’s bad practice. Guy doesn’t want to leave a jumper on it because that can be a problem cause somebody get hurt.

Cause this thing to melt down on you. Which kind of messes up your weekend. Man that messes up your whole month.

It does doesn’t it. It really sheds production down and causes lots of people to get upset.

So let’s see what else are we calibrated this week did some some pressure transducers on an autoclave.

OK. Yes. Yeah autoclaves a pretty impressive piece of equipment. Some of those can be pretty big. And so what what happens in ironically what what does that process work. What are they doing there.

Well they could put a bunch of marshmallows inside this too. And they shut the door and they pressurize it and then they apply heat to it. That would be an interesting marshmallow.

It would be yeah it will be that’s how you get it perfectly Brown on the you know black on the outside but still gooey on the inside. OK. Use an autoclave. You didn’t know that did you. No I didn’t know there are a hundred degrees gives you a mushroom calibrated Tulsa calibrations perfect. You know marshmallows so it can make some good smores with that. That’s right. That’s right. Sometimes I put the Graham cracker in the chocolate and the autoclave as well when nobody’s looking. And then I will have a more. That’s a good idea. Good thinking man.

But I mean they’re basically any other furniture you know just under pressure and back you will you have vacuum available through ports so they can suck all the air out of their parts. OK. Yeah. Or the film around them and you know kind of smashes everything together and it does suck on one part and blowing on the other part just smashed it and it really really really improves air circulation which really improves the whole process.

Yeah yeah. Good air circulation is good for autoclaves to work properly. It’s very good for. Taso calibrations to work properly.

Your clothes are really a good item item to use though because uniformity is in really good temperatures throughout the furnace maintain usually within plus or minus 5 or so because they have a pretty kick butt cooling system that can kick on and off.

Oh. Unlike normal furnaces you know well we have a few of those and that also calibrations area. Yep I know. I know of at least seven or eight just between two places.

Yeah yeah I can’t. But I believe you I to think about it by Whirlpool.

Oh. OK. Whirlpool. No not whirlpool. I said oh by Whirlpool. Oh that company at my word. Oh let’s see over the wall so I guess you’re saying we already him.

Yeah. OK OK. Yeah yeah there’s a few of them over there a bunch of them. Yes they do. As a matter of fact I bet they have at least six of them. Yeah. Now have you. Have you been over there. Oh you have. OK. I don’t remember. OK I do. OK.

I just hope we get around in the Tulsa calibrations community.

Can you believe we’ve already it’s this podcast a six and a half minutes.

We’re getting there and it’s just that is just unbelievable the amount of knowledge that you’ve given in the last 15 1/2 minutes or more. So what are some of the things that you’re looking at out that whenever you’re running a survey and you’re monitoring a chart recorder.

Well so what are we doing want to do that. We have. So when we’re doing a uniformly survey we’ve got all kinds of thermal couples all piled up inside of this oven. And so we’re taking each one of those thermal couples put it onto a chart recorder and watching the temperature for all of these thermal couples all at the same time and we’re recording it and making sure that it’s all there all our temperatures are good. Based on that set point. So we’re just you know we’re always thermocouples up the chart recorder and watching it.

And we set the set point on the furnace and we watch these temperatures and make sure that they’re within the prescribed tolerance and run it for 30 minutes. Let the customer know what’s going on.

What some of the things you look after that you’re there you’re specifically looking for when you’re watching the start of a thermal survey or OK or the completion of a thermal survey.

Right right so. Good question. Good question. I’ve got lots of good questions. So you know so once you’ve worked all these thermocouples up and you’re watching them on the chart recorder then you set your set point on the furnace and and there’s a temperature’s coming up. You have to watch and monitor these all these thermal couples and the first thing you’re looking for very important is that they don’t go over the prescribed temperature. What about just for a split second. Oh man I tell you it no it just doesn’t work. But you know when we do am 27 50 surveys it just can’t happen. I heard in the Tulsa calibrations community that it was ok well maybe with some people maybe some companies not with that precision calibrations because if it goes over it’s over over over is over and then yes it is.

So there’s there’s just nothing else you can do about it.

So but but yes I know you’re watching for that.

And then also you’re also watching then for the for all of the temperatures to come in within within the spec and.

And if they do that’s great. Let it run for 30 minutes and button it up and you’re done. It’s good to go running parts making cookies. Oh those buttons don’t get melded into the cookies. Oh no. Yeah. Yeah. They’ve got to be separated. Can’t do that kind of cookies like Travis.

Oh you know my favorite is probably macadamia. Oh that is our. Those are good. I really like sugar cookies too. Sure. Cookies rock too. Yeah those are the those are my two go to good old chocolate chip man. Specially in the Tulsa calibrations area.

Yeah. And I think people need to be getting their ovens calibrated so we can make sure everyone’s making good cookies. So what else could they cook besides cookies.

I don’t know why the what why don’t we just bring take that one over into our next podcast.

I like pie. I like I like calibrated pi because I like calibrate of why I do