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Contact block 1N.O. + 1N.C. + 1N.O. scaled

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Q: What is dry and wet contacts?
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Difference between dry cell and wet cell?

a dry cell is a cell that has electrolyte that is a paste a wet cell is a cell that has a liquid electrolyte -sads


Is THWN wire used for dry locations only?

No. Per the National Electrical Code, table 310.13, THWN is suitable for dry and wet locations with a maximum operating temperature of 75o C. THWN-2 wire is suitable for dry and wet locations up to 90o C.


How do you calibrate displacer type level transmitter?

You have to specify which type of calibration you want to perform on the transmitter dry, wet or online calibration ?


What is potntial and potential free contact?

Potential free contacts (also called "dry contacts") are simply contacts which are physically operated with the main device, but not electrically connected to it. For example a motor contactor often has auxiliary contacts that are operated by the main coil and open and close at the same time as the main contacts but are not used for control of the motor starter. If they are connected to an outside circuit to indicate the status of the starter without being powered by the motor supply they would be considered potential free contacts. These type also called Signal-Contacts. In case of relays and switches if the common/pole is connected internally to a given potential like a 110V phase etc., the contact is not POTENTIAL FREE but if both the common and the normall open (and at time also the normally closed) contacts are presented to the user for connecting in his system as he pleases,the contact is said to be "potential-free".


What is difference between wet corrosion and dry corrosion?

Corrosion is occurs when a metal becomes wet or damp. A current flows through this, making the unmoving particles throught the steel to the more reactive parts on the surface. These are called anodes. The current returns from the more reactive parts, through it, and then back to the the more still parts. Where the current leaves the anode, rust forms. Wet corrosion happens when a metal or other material is wet or damp- (or can be caused through the mositure in the air) Dry corrosion is similar, however the difference is that it forms through the presence of gasses in the air