| The Pros and Cons of End-of-Stroke Apprehension with Reed Switches
Pneumatic cylinders are acclimated in abounding applications as prime movers in machinery, actual handling, assembly, robotics, medical, and the account could go on. One of the challenges adverse OEM’s integrators and end users is to ascertain anxiously whether the butt has been absolutely continued or abandoned afore acceptance apparatus movement. Solutions cover the use of anterior microwave sensor with some array of ambition and internally army allurement (by the butt manufacturer) on the butt piston. In my antecedent blog, I discussed the two primary magnets, axially and radially magnetized magnets, acclimated by butt manufacturers. Now, we will analysis one of the a lot of frequently acclimated alluring acreage sensors to ascertain addendum and retraction of the cylinder…the acclaimed reed switch.
The reed about-face is the a lot of simplistic end of achievement sensor accessible on the market. It has several advantages and even added disadvantages. About afore we attending at the laundry account of pros and cons let’s analysis how the reed about-face operates.
The reed about-face consists of two bedfast ferromagnetic nickel and adamant reed elements, amid in a hermetically closed bottle tube. The hermetically closed tube aids in aspersing acquaintance arcing and prevents damp from accepting touv sensor the about-face elements. As an axially accumbent allurement approaches the about-face element, the reed elements are magnetized and are admiring calm commutual the circuit.
The pros of the reed switch:
LOW amount is the amount one advantage of a reed switch, which would explain its advanced use.
No ability burning – the reed about-face is a automated about-face that provides a “dry” acquaintance closure.
It is a two-wire accessory – it can be acclimated in either AC or DC applications, and it’s simple to accommodate into a PLC. All that is required, is to administer your accumulation voltage on one reed and affix the added reed to the PLC ascribe bore or any accessory that has a low ability burning rate.
Ummm…well that’s about all of the pros.
The cons of the reed switch:
Remember that beforehand I mentioned it was mechanical… able-bodied with automated accessories and affective apparatus the after-effects are a bound life.
If you administer a top accepted load, you will abbreviate that bound activity even more.
Oh did I acknowledgment it was mechanical…well automated accessories are about slow; I beggarly we are talking several milliseconds. Reed switches may not acknowledge fast abundant in accelerated applications.
The allurement acclimated accept to accept a able abundant Gauss rating, usually in balance of 50 Gauss, to affected the acknowledgment force or animation memory, of the reed elements.
In some applications with top beating and shock, the reed about-face may be damaged or display acquaintance bounce.
Reed switches can aswell authenticate bifold about-face points. What’s this? As the magnet, passes beneath the sensor army on a aeriform cylinder, the accompanying lobes of assertive magnets may could cause the reeds to accessible and close.
Reed switches will not plan with a radially magnetized allurement because alone one pole ofgas monitor the alluring acreage is presented to the reeds and both poles are appropriate to attract the reeds.
Reed switches are frequently acclimated in a advanced array of applications. They absolutely do accept their place; however, they aswell accept acquired abounding assembly curve ample amounts of down time and absent productivity. Next, we will attending at some bigger alternatives for aeriform butt end of achievement detection |
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