Is there any compensation for variation in atmospheric pressure? It is the static atmospheric pressure (psta) that is read by the pressure sensor. I miss-spoke agreeing to it as pressure at sea level. Since the reference is sealed within the sensor, that provides the basis for the sea level measurement.
Oops! I see that p-sta is the ONLY pressure in the equation, so it must be the measured pressure. Is there any compensation for variation in atmospheric pressure?
(my previous post:
@Randy Frank: On Slide 16 (altitude calc), I assume p-sta is the pressure at sea level. Correct?)
@Frank - With accurate differential pressure measurement, does temperature need to be taken either side of the orifice ?
This is interesting question. When suppliers provide data regarding the effect of temperature on their sensor it is normally done with both sides of the sensor at the same temperature. If the sensor is temperature compensated, in a flow measurement the temperature sensing is an integral part of the sensor. If a large temperature difference exists between the upstream and downstream measurement, it should be essentially averaged in the sensing circuitry. If you are providing the temperature compensation yourself, what you have to consider is the upstream temperature or downstream temperature more important? Does the situation change over time? The answers may make you consider two temprature sensors but in most cases you should just need one.
@mahdee: I'm not having audio problems today, but I did in the last lectures several weeks ago, and it was because I had updated my flash plugin. I declined an update today. It's possible that others may have updated and are incompatible with the audio stream. I'm running Firefox.
A new battery design, which replaces lithium with abundant and low-cost elemental sulfur, is still in its nascent stages but shows real promise for giving batteries more energy potential.
PTC will offer a virtual desktop environment for its Creo product design applications, potentially freeing engineers to run them from remote desktops on a variety of operating systems and mobile devices.
The push to achieving more intelligent, integrated manufacturing is putting a strong focus on networking and connectivity as key enabling technologies.
Now that solar and wind harvesting technologies are a thriving market, researchers are seeking other environmentally related energy sources for which they can create harvesting devices.
From Dell / Intel® New Paradigms in Design Work Scott Hamilton, vertical market strategist for Dell Precision workstations, 5/2/2013 5
Early in my career, I worked as a draftsman and remember the days of drawing on vellum with numbered pencils and Mylar with plastic lead. This was a fun experience in the sense that I ...
I've been using workstations for more than 10 years and love finding ways to get more performance from my system. With demanding professional applications that require more power each ...
A lasting memory from my first job as an engineer in an auto assembly plant is standing on hard concrete at six in the morning, vending-machine coffee clutched in hand, listening to ...
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.
To save this item to your list of favorite Design News content so you can find it later in your Profile page, click the "Save It" button next to the item.
If you found this interesting or useful, please use the links to the services below to share it with other readers. You will need a free account with each service to share an item via that service.
Tweet This
7 
