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Old 10-03-2012, 07:11 PM   #1
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Default air cylinder indicator lights

I need to install indicator lights on a control panel to show when the air cylinder is fully extended and when it's fully retracted. It's in a class 2 enviroment. I was thinking of using 24VAC indicator lamps on the panel but what would you guys recommend for the sensing/switching at the cylinder?
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Old 10-03-2012, 07:18 PM   #2
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Check to see if the existing cylinders have magnetic pistons, if not retrofit with ones that do and use cylinder position switches.


One of the style switches available from bimba
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Old 10-03-2012, 07:20 PM   #3
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Most brands of air cylinders have an option of a magnetic piston and you would attach magmatic reed switchs to the outside of the cylinder. Then use the switches for whatever you want.
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Old 10-03-2012, 07:32 PM   #4
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I do not think you need to have a magnet for certain types of Prox switches.

Carlo Gavazzi makes Photoeyes that are used in car wash applications that may work also, as long as it is not too dusty

Last edited by Pearce Services; 10-03-2012 at 07:38 PM.
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Old 10-03-2012, 10:42 PM   #5
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[quote=Jlarson;824238]Check to see if the existing cylinders have magnetic pistons, if not retrofit with ones that do and use cylinder position switches.

I didn't know there were magnectic pistons. I'll have to check what they have.
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Old 10-03-2012, 11:45 PM   #6
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Depending on application, could also use a prox on whatever the piston is moving, or they make class 2 limit switches.
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Old 10-04-2012, 01:45 AM   #7
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Many air cylinders have sensors as an option and many I have come across already have mounting arrangements built in or T-slots machined for sensors already in the housing.
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Old 10-04-2012, 04:04 AM   #8
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They have some cool stuff.
https://www.gavazzionline.com/CGLRC.asp
https://www.gavazzionline.com/CGLRC....hw=FoRlYlzzYD0
Quote:
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I do not think you need to have a magnet for certain types of Prox switches.

Carlo Gavazzi makes Photoeyes that are used in car wash applications that may work also, as long as it is not too dusty
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Old 10-04-2012, 04:07 AM   #9
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what make of cylinder?
Quote:
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I need to install indicator lights on a control panel to show when the air cylinder is fully extended and when it's fully retracted. It's in a class 2 enviroment. I was thinking of using 24VAC indicator lamps on the panel but what would you guys recommend for the sensing/switching at the cylinder?
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Old 10-04-2012, 09:10 AM   #10
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Quote:
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what make of cylinder?
Don't know what brand they are.
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Old 10-04-2012, 12:14 PM   #11
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Quote:
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Don't know what brand they are.
take a picture of it and post it......we like pictures.

Also take some metal filings and put it on the outside of the cylinder and stroke the cylinder back and forth a couple time. If the piston is magnetic the metal filings will move.
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Old 10-04-2012, 01:53 PM   #12
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Quote:
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Also take some metal filings and put it on the outside of the cylinder and stroke the cylinder back and forth a couple time. If the piston is magnetic the metal filings will move.
Fricken brilliant! I've never thought of that! I've always use a magnet on a string, but it's hard to determine sometimes if the magnet is moving from the piston magnet or from my shaky hand.

Just to be clear on the concept, the ENTIRE piston shaft is not magnetic, the piston shaft HAS a magnetic ring attached to it, specifically for this purpose. You can also get sensors, called "magnetostrictive transducers", that will give you an analog output based on the exact piston movement length. Much more expensive of course, but the basic low cost system is to just use the magnetic pickups for End-of-Stroke position.



A lot of actuator pistons will have this built-in even if you didn't ask for it. Sometimes I've even discovered that if you ask, they just charge you more for it but if you don't ask for it, you get it anyway because they don't really build two different versions, they just have two different part numbers. The filings trick is a great way to find out!.
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Old 10-04-2012, 06:02 PM   #13
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1 way cylinder with spring return. Switch at on position(retracted).
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Old 10-04-2012, 06:11 PM   #14
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the reed switch thing mentioned above is the hot ticket
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Old 10-05-2012, 12:16 PM   #15
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We use the hall effect type of switches on our cylinders for the most part. It does take the right type of cylinder to make them work. The mechanical guys are always replacing defective cylinders with the non sensing tpyes then we get called because nothing will work. I have also fastened a small piece of steel to the object that moves and use a standard non-shielded prox. switch.
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