Onboard Air help....

[TheGetLostTaco]

I'm currently installing an ARB CKMA12 compressor with a 2 gallon tank. The compressor operated by itself has a pressure switch that goes on the "mini tank" on top the compressor. Question is if used with an external tank then the pressure switch should be located on the the tank not the compressor, correct?

Thanks.

 

[Chazz Layne]

Correct. Also not at the directly opposite end of the tank from where the compressor feeds in, since it will trigger the switch early.

 

[TheGetLostTaco]

. Thanks!

 

[WSS]

It does not really have to be moved as long as the pressure is static throughout the system (no shut off valves to isolate), if there are valves to isolate pressure, then the best place for the pressure switch is on or close to the pump outlet. To see the "real" effect, put a pressure gauge on the end of your fill hose and one close to the pump and any other far extremity in the air system and see the psi difference, a few pounds is not going to harm or overload any part of the system. On a quick drain, say while filling a tire or blowing out the cab, the drop may show a big difference but not on the fill unless you have a very high cfm output pump or are running small line (1/8" or less) and the tank cannot transfer/equailize the load. 1/4" line is generally plenty for a under 15cfm system.

WSS

 

[Metcalf]

I have the ARB twin in my old flat fender with a small tank. I left the pressure sensor in the stock location, works great.

 

[1stDeuce]

Yup, pressure is pressure. It's virtually the same throughout the system unless you're flowing a LOT more CFM than an ARB compressor will flow, or you're pushing it through REALLY tiny line. Just plumb the extra tank in and leave the switch where it is. And putting it opposite the inlet won't have any effect on it switching off early or anything like that...
Chris