What is this tube for???

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If the pump has a float switch to turn the pump on and off then the float switch may rely upon air to push against the diaphram.

Got this off the net---
Switch cord contains a small white breather tube which extends out of switch plug . Be sure switch cord is not pinched and non-restrictive air flow can occur in breather tube. Do not allow water to enter into breather tube. Non-restricted air flow is required for proper switch operation.
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Many pumps cords have male ends at the end with the breather cord attached to the plug. It is very important to not cut those ends off and try to direct wire those pumps.
 
Some of these pump floats that have a "high float" and "low float" have a relay prewired into the cord, that looks like a lump that is heat-shrinked into the cable. (SE Rhombus, in particular). The first one of these I ever ran across threw me for a loop. The relay in the cord activates the pump when the high float is tripped, and keeps the pump running until the low float falls.
 
chevyx92 said:
Here's a pic of a float switch. The cord has a clear hollow tube in it with the conductors, what's the purpose of the tube?
http://i112.photobucket.com/albums/n185/gebasgt/DSC01558.jpg

http://i112.photobucket.com/albums/n185/gebasgt/DSC01559.jpg
Click to expand...

Breather tube. The float switch is built into the pump. It must remain upright to work properly. As the water rises, it enters a pressure chamber and pressure begins to build. The inside of the diaphram is piped to the breather tube to allow the pressure to escape.
 
The other thing it got my attetion there is the wire colour that is not a American colour code at all i did see brown and bleu colour there .

That kind of pump the pump motor must be mounted in correct postion to order the float switch to work properly [ i did see few of that but not too often ]

Merci, Marc
 
chevyx92 said:
. . . what's the purpose of the tube?
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That tube is not really empty; you guys just can't see what's inside it. It's the Emperor's New EGC. :grin:


Actually, that switch is not a float switch at all; it's a diaphragm-type pressure switch. And, just like the eustacian tubes that connect your inner ears to your throat, it allows the backside of the chamber to remain at atmospheric pressure.

To restrict the tube would interfere with the switch's accuracy at sensing water depth. Washing machines have similar switches for determining water depth within the tub; machines that no longer fill have a defective pressure-switch.
 
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frenchelectrican said:
The other thing it got my attetion there is the wire colour that is not a American colour code at all i did see brown and bleu colour there .
Click to expand...

Brown and Blue are the most common colors used on industrial sensors for power. Usually 24VDC sensors.
 
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