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Here you go ! the above attached photos includind the 2 timers I used in my kidde, oil pressure sensing device wiring diagram, the connection wiring and a digital sound level meter as your reference.
Basically the whole wiring is very sample, I have show it in the connection wiring, even you can have the P/N of the timer from these photos, but one of the timer (3 minutes type) been modified to 10 times (30 minutes type ) by me to meet my requirement, this timer are using R.C. circuit design basis, so it's very easy to done it just changed the "R" with a correct valve of resistor. but I supposed you may can get same series but 30 minutes type timer from the maker directly with no problem. the reason why I decided to choose this series of timer is they are use 24vdc power ( very close to the oil pressure sensing unit and the drain valve used one 28 vdc, and easy on the power preparation ), small size but with a 7A current rated ( this number can be drive the drain valve coil of the "cornelius" moisture separator in very easy ) feature.
With regard to the oil pressure sensing device, it's icluding a thermal type timer in inside of the box, it run with 28vdc in originally but just no problem to use 24vdc power, the differece is when it using 24vdc power the time counting will get a little delay, this is because the inside heater need more time to reach the target temperature. normally this old type timer is very reliable also it has a screw hole and can be made an adjustment, for my case I have setted the delay time is around in 5 seconds. the reason why this oil pressure sensing unit needed this timer is that, when we turn on the compressor the oil pressure will need some time to reached the normal operating pressure level from the initial zero point , so, this timer are needed to prevent this window period to missed shountdown the compressor ( let us see when we turn on the power the pin 2 and 7 will have a temporarily closed until the time setting on the timer have get reached, but at the same time since the oil pump were already built up a safety level of the oil pressure and made the pressure switch actuated before the timer pin 2 and 7 are turned to an open condition). basically you still can use a model timer to replace it. both of pneumatic pressure swith and the oil pressure switch are connected in series way to the AC power source to to play as safety /auto stop control.
To the noise level measuring, I just have no digital sound level meter (pls refer to the attached photo) to do it, but this kind of instrument are been widely used for measure and judge the noise level, and you may asking the local EPA for the detail of this kind of instrument. for your information that compared a Bauer model VARIOS V2B I used in before with the my current kidde, I would say the Kidde is more comfortable to me. By the way I forgot to mention my discovery, I have found with that, same compressor unit but using different form of intake filter device will caused different noise generated, that means choose a right one intake filter (may be in size or shape) device will make people' ear happy with it. I beleived there have no standard noise will out the same compressor but just depend on their intake tunnel various combination (i.e. expension tube used or filter chamber size and shape design), I personally beleived except the machine itself with a fix noise come out from their operation, but the intake tunnel also contributed a certain level of noise. because of a resonance reason therefore choosed different combination will be resulted the board frequency and level generation with a shift.
The 6 cfm kidde you have mentioned I been saw it from the internet, it's 5 stage designed (supposed it should be more powerful, since I been saw a big 5 stage compreesor for aircraft ground service used and it's 6000 psi rated ) and with vertical designed. I am not sure if this stuff is same as you have talking about ?
