Pressure – The Inner Working of the Basic Pressure Gauge

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.

9011_exair

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.

Pressure Gauge Top

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.

Brian Bergmann
Application Engineer

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Nice & New FAQs

In Russ Bowman’s most recent blog, More Power? I DO Think So…, he mentioned several key questions that an EXAIR Application Engineer will ask whenever we are troubleshooting a compressed air application that is not performing to the standards needed.    The blog talks about very common questions that we will ask customers when they call in with an existing compressed air application.   He then goes on to explain the usefulness of how many of the EXAIR products are adjustable using shims which are more often than not, patented.

Knowledge Base
EXAIR’s Knowledge Base is a wealth of knowledge.

 

Answers to questions that we frequently get from customers, on almost every single product we offer are all available for free, without even having to call, write, or tweet an Application Engineer. In the EXAIR Knowledge Base we offer a full section on FAQs.   This section is broken into each product category, and contains a wealth of information.  Most of these answers can also be found within our full catalog but we have streamlined to the most commonly asked questions in the FAQ section.

All of the product categories have even been recently revised to include questions for our products that have been released throughout the year.   There are now questions that have answer for the 108″ Super Air Knife, High Lift Reversible Drum Vac, and even PEEK Super Air Nozzles.   We will also continue to expand this section of our website to include any new products and or questions that start to arise.  So if you have a question that you don’t see on there, let us know and you just might see it get posted.

Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF

 

Knowledge Is More Powerful than Hardware

Two weeks ago, my wife and I went shopping for a wearable baby carrier for our new son. We had searched on the internet for prices and materials for the carriers, but to make the final purchase, we wanted purchase it from a store. With the rest of our baby purchases, I was able to talk to my brother, sister-in-law, or coworkers to get a feel for brands and products.  For some items, a brand name was well worth the expense, and for other items any version would do.  Some of the great advice we got was that any garbage can with a lid made a good diaper pail, because even the best smell eliminating filtration would not contain the smell that will build up, if you don’t change the bag early and often. However, when it came to a wearable baby carrier, it was a new age item in my family, so no one we knew had one we could try.

Also, we didn’t know anyone who was currently using a brand that gave a good review or had a lot of experience, so we had to rely on what we could put together from the internet. We surfed the internet and found videos put out by several companies and how-to’s done by the DIY folks, but couldn’t determine a clear way we wanted to go, because on the internet everything seems great. So, we pack the 5 day old infant up in the SUV, and head to the store to see what we can find. We went to the big box store and found some inexpensive carriers that came with all sorts of nylon fiber, straps,  and snaps, but no one was there to help us or had any idea, which product might work better for us.

book of knowledge

 

With the cost of the this carrier in mind, we went to the more boutique shop to see what we might find. The store is a small shop that is known for selling specialty products that are outside of the normal baby shower gifts. Here, we were greeted at the door by a helpful gentleman, who asked how he could help. He promptly pointed us the carriers he stocked and encouraged us to look around and open the packaging to see, if his products would work out for us. He freely admitted that he did not have a lot of experience with the specifics of each brand, but gave us the name and contact number of a clerk who specialized in the field. This clerk also taught classes to better understand how to use the product. The man encouraged us to attend the class and advised us, if we want to get one today, we would be welcome to return it. My wife was able to try the different brands, and see what work for her. With the baby carrier we eventually bought, we found detailed print instructions and a website that we could pull up on our phone with video and photos of several applications. She went ahead and tried out the carrier with the baby, and we browsed through the rest of the store.  After 45 minutes of shopping, my son was sleeping in the carrier and my wife successfully avoiding the women’s clothing section of the store. Whew

We purchased the carrier that day feeling confident that it would work for us, but knowing that if we had a problem that a person would be able to help us, if we returned the item. Though the man minding the store didn’t know the answers to all our questions, he did know how to get the answers to our questions, and encouraged us to try out his products to see, if they would fit our needs. When we got home and looked at what we bought, it really was a simple device – some fabric and a few metal rings that we may have been able to make or source ourselves. In most instances, I would have had a small amount of buyers remorse, because the product I had purchased was more expensive than what we could have purchased at the big box store. But with the confidence I had that the purchase was perfect for us, I would buy the same product again.

Working at EXAIR, I really enjoying sharing our success stories with other customers.  Though we are always going to speak about our products in the best light, we can tell you with confidence whether or not our products are going to work in your application. Having a knowledgeable sales staff that knows our products and its application is not an easy commodity to come by, but one that I value in the businesses from which I purchase. EXAIR’s Application Engineers are available over the phone, through email or with a chat. Don’t hesitate to ask any question about our products or your application.

Dave Woerner
Application Engineer
DaveWoerner@EXAIR.com
@EXAIR_DW

 

Image from Tessss. Creative Commons License