Everyday here at EXAIR we talk about pressure, specifically compressed air pressure. The other day I was looking up our model 9011, 1/4″ NPT Pressure Gauge , and it got me to wondering just how does this small piece of industrial equipment work. The best way to find out is to tear it apart.
Most mechanical gauges utilize a Bourdon-tube. The Bourdon-tube was invented in 1849 by a French watchmaker, Eugéne Bourdon. The movable end of the Bourdon-tube is connected via a pivot pin/link to the lever. The lever is an extension of the sector gear, and movement of the lever results in rotation of the sector gear. The sector gear meshes with a spur gear (not visible) on the indicator needle axle which passes through the gauge face and holds the indicator needle. Lastly, there is a small hair spring in place to put tension on the gear system to eliminate gear lash and hysteresis.
When the pressure inside the Bourdon-tube increases, the Bourdon-tube will straighten. The amount of straightening that occurs is proportional to the pressure inside the tube. As the tube straightens, the movement engages the link, lever and gear system that results in the indicator needle sweeping across the gauge.
The video below shows the application of air pressure to the Bourdon-tube and how it straightens, resulting in movement of the link/lever system, and rotation of the sector gear – resulting in the needle movement.
If you need a pressure gauge or any of the EXAIR Intelligent Compressed Air® Products, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.
“To measure is to know – if you cannot measure it, you cannot improve it.” -Lord Kelvin, mathematical physicist, engineer,and pioneer in the field of thermodynamics.
This is true of most anything. If you want to lose weight, you’re going to need a good scale. If you want to improve your time in the 100 yard dash, you’re going to need a good stopwatch. And if you want to decrease compressed air consumption, you’ll need a good flowmeter. In fact, this is the first of six steps that we can use to help you optimize your compressed air system.
There are various methods of measuring fluid flow, but the most popular for compressed air is thermal mass air flow. This has the distinct advantage of accurate and instantaneous measurement of MASS flow rate…which is important, because measuring VOLUMETRIC flow rate would need to be corrected for pressure in order to determine the true compressed air consumption. My colleague John Ball explains this in detail in a most excellent blog on Actual (volume) Vs. Standard (mass) Flows.
So, now we know how to measure the mass flow rate. Now, what do we do with it? Well, as in the weight loss and sprint time improvements mentioned earlier, you have to know what kind of shape you’re in right now to know how far you are from where you want to be. Stepping on a scale, timing your run, or measuring your plant’s air flow right now is your “before” data, which represents Step One. The next Five Steps are how you get to where you want to be (for compressed air optimization, that is – there may be a different amount of steps towards your fitness/athletic goals.) So, compressed air-wise, EXAIR offers the following solutions for Step One:
Digital Flowmeter with wireless capability. This is our latest offering, and it doesn’t get any simpler than this. Imagine having a flowmeter installed in your compressed air system, and having its readings continually supplied to your computer. You can record, analyze, manipulate, and share the data with ease.
Digital Flowmeter with USB Data Logger. We’ve been offering these, with great success, for almost seven years now. The Data Logger plugs into the Digital Flowmeter and, depending on how you set it up, records the flow rate from once a second (for about nine hours of data) up to once every 12 hours (for over two years worth.) Pull it from your Digital Flowmeter whenever you want to download the data to your computer, where you can view & save it in the software we supply, or export it directly into Microsoft Excel.
Summing Remote Display. This connects directly to the Digital Flowmeter and can be installed up to 50 feet away. At the push of a button, you can change the reading from actual current air consumption to usage for the last 24 hours, or total cumulative usage. It’s powered directly from the Digital Flowmeter, so you don’t even need an electrical outlet nearby.
Digital Flowmeter. As a stand-alone product, it’ll show you actual current air consumption, and the display can also be manipulated to show daily or cumulative usage. It has milliamp & pulse outputs, as well as a Serial Communication option, if you can work with any of those to get your data where you want it.
Stay tuned for more information on the other five steps. If you just can’t wait, though, you can always give me a call. I can talk about compressed air efficiency all day long, and sometimes, I do!
That’s the goal – we want it to be easy for you to do business with EXAIR. I understand this is not exactly a quantitative expression, and everyone here likes to have data to back up our claims. Well, here are just a few ways that I have found to verify we are easy to deal with.
Whenever you call in, the phone is answered by a live person. This of course is true for Monday through Friday from 8 AM to 5 PM EST – what most of us consider “normal business hours”. The team that answers the phone is also our Order Entry team who can help with pricing, some general product questions, lead times, freight quotes, etc. And, if you need additional technical information or an expert to assist you with implementing a solution for your problem, they are the team who will pass your calls on to my team, the Application Engineers.
We have a full staff of Application Engineers who are here to assist with selecting the right product to fit your needs and troubleshooting existing compressed air setups. Our Application engineers are experts at determining how much compressed air can be saved compared to an existing setup and how that translates into your dollar savings. They understand how important it is to you to keep your processes OSHA compliant and personnel safe. Our Application Engineers also walk you through any returns which may occur with our 30 day trail period, which brings us to the next topic.
We honor a 30 day guarantee on stock products. This permits you to get the product in to your facility and put it through the paces and if it doesn’t perform to your standards, give us a call. We will take the item back and issue you a full credit for the purchase price of the product. I should probably state at this point that – Yes, we do deal with applications we have not dealt with before. In these situations we remain confident in our recommended solution (or we would not have made it) but will remain close to you as the installation and implementation occur just so we can help troubleshoot if necessary. If it ends up not working – see the first 3 sentences.
On top of all those, we stand behind our product with a 5 year built to last warranty for compressed air products, and a 1 year warranty on electronic components. This just goes to show how strongly we believe in our workmanship and our products.
In case you have never called or sent in an inquiry from one of the numerous ways we offer to contact us, please do. I can assure you that you will receive a timely response from a live person that will give you the best answer possible. If we don’t have the answer, we’ll tell you and many times we will offer a good place to find a solution.
At our Boy Scout Troop meeting last night, we had adult volunteers in two rooms, putting their “day job” skills to use. Two of our troop parents are dental professionals, so they were working with the Scouts, as a group, to complete the requirements for their Dentistry Merit Badge. In the other room, a couple of other parents and I were making last-minute equipment preparations for the Troop’s annual Lenten Fish Fry.
Anyway, one of our projects this year is to fix or replace the fryer tank. Nobody knows how old it is or where it came from…one of our Assistant Scoutmasters has been around for almost 20 years, and it was here when he came. Now, it’s just a big metal box that sits on the stove and holds the oil that we fry the fish in, but with three engineers looking it over and coming up with ideas, it’s got the potential to be the most complex big metal box in the county. The current problem is only a ¼” crack near the top of a corner, but also on our “wish list” are items like:
*Handles: this tank is about 4 feet long, 3 feet wide, and 18 inches deep. It’s not heavy at all, but handles sure would make it easier to move around, wash, dry, etc.
*Drain: Currently, we use a small battery operated pump to empty about 10 gallons of oil out of it every Friday night. A strategically placed petcock valve will cut our clean up time to a fraction of what it currently is.
*Temperature control: these ideas ranged from a port for a permanently mounted thermometer to a thermocouple that we could tie in to a regulator in the gas line. We’re all scared of tapping into the gas line, so the thermometer is looking better and better. It’s always fun to see yourself on the news, but not when it’s because you were involved with a fire that burned a church building down.
*Material of construction: Stainless Steel is awesome, but we’re probably on more of an aluminum budget.
Last week, we had the pleasure of conducting an Efficiency Lab Test of a customer’s drilled pipe compressed air blowing device. It was doing the job, but it used a lot of air, it was loud, and it had been in place for as long as anyone could remember. As it turns out, our 12″ Aluminum Super Air Knife looks to be a viable solution to the items on their “wish list”: reduced air consumption, and lower noise levels…it’s going to cut both to a fraction of what they are currently. This is a significant improvement, because not only are they going to save $500-$1,000 per year on compressed air for each of two units, but the operators no longer have to wear hearing protection, since the maximum sound levels are going from 108 to 67 decibels…well below OSHA’s published 8-hour limit of 90 dBA.
These are two examples of what can happen when you get a couple of engineers involved in a project. If you’d like to find out how much you can save your wallet…and ears…by switching to EXAIR’s Intelligent Compressed Air Products, give me a call. If you find yourself hungry and on the east side of Cincinnati on a Friday night in the coming weeks, I can also tell you where to get a great meal in support of a great organization.
Earlier this morning I heard that a high speed chase that started in Michigan ended near Cincinnati, Ohio. My first thought was that, due to traffic, the chase became a jam. Depending on the time of day, it’s IMPOSSIBLE to go anywhere, no matter how much you want it to happen (a circumstance many of us experience).
Similarly, when there is inadequate sizing of a compressed air line, no amount of desire is going to deliver the air where it needs to be. Imagine every air molecule in the pipe is a car on the road. When demand spikes and all those air molecules need to go to the same place, they have to have sufficient space to do so, just like vehicles on the road need enough lanes to prevent backup. When the demand for compressed air reaches the maximum flow rate of the pipe, this is called saturation. When the demand for compressed air exceeds this saturation point, end use items such as air nozzles or air tools are going to be starved for air. The air might get there, but it will be late, and the earlier air molecules will be long spent, leading to underperformance of the item.
Unfortunately for those of us who fight traffic daily, fluid flow mechanics don’t apply to traffic flow. But, fortunately for those of us who use compressed air as a utility, compressed air IS bound by fluid mechanics. So, if we can quantify the compressed air demand in a system, we can design the system with enough capacity and volume capability to perform as needed.
EXAIR Application Engineers are well versed in helping our customers determine line sizes and providing support for our products on their systems. If you need help with an EXAIR product and how it integrates into your compressed air system, contact an Application Engineer.
If only we could call city engineers to help with traffic…
Earlier this week I was in a conversation with our Nicaraguan distributor, Optima Industrial. We were discussing the results of a recent exhibition, products gaining traction, and the direction in which the market is headed. During the recent exhibition in Nicaragua, one customer came to the Optima display booth exclaiming “Wow, you have real toys for engineers!”. I’ve heard that before, and it’s always a pleasure to hear it again.
Fast forward two days to a phone call from an injection mold company, and the theme came up again. The end user on the other end of the line had an application that needed to be cooled, and the choice was split between a Super Air Knife and a Super Air Amplifier. In this particular case, the Air Amplifier would have moved a great deal of air, but the complexities of the surface area to be treated meant that a wider, laminar airflow pattern was more beneficial. So, a series of Super Air Knives on the top and sides of the molded item were chosen.
But, as the conversation carried on, we got into the topic of the Cold Gun.
“How does it work?”
“The Cold Gun uses the same technology as a Vortex Tube. A compressed air supply travels through the Cold Gun and separates into two distinct air flows. One hot, and one cold. We offer the Cold Gun as a turn-key solution for an application needing point-of-use cold air.”
“Amazing. I’m sure we need one of those around here. Add one of those to the PO too.”
It’s a great feeling when someone shares excitement for the same things you do. Usually we share that with our end users. This week, it was the end users sharing it with us.
More than once since I have known my wife she has given me a look as if to say, I can’t believe I know someone as geeky as you. (Ok, maybe it’s been too many times to count.) Last week I was able to get comic books into my blog, I’m pretty sure I have mentioned video games, and even building computers. While I don’t consider myself as big of a geek as some of my friends are, the fact is I am a geek.
I am ok with this and I am sure once my daughter is at the right age she will not be ok with it. The fact is that technology, and engineering catch my interest. I can read a tech manual for my motorcycle a lot faster and with more enjoyment than I can any fictional novel. This is also one of the many reasons I became an engineer.
This is yet another reason why I enjoy my job here at EXAIR so much, I’m constantly learning from our customers how their products and processes are done so that I can help them better their process. This always intrigues me because not only are the customers learning from me how to implement the EXAIR product lines but at the same time I am learning new processes and how things are made so that I can then help other customers in the future with similar applications.
It’s an infinite loop of learning for me here at EXAIR.