Oil Pressure Sender failure modes?

dingbat

dingbat

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Horigan said:
A pressure sender has a strain gauge, piezo sensor, or some other means of measuring strain on a diaphragm to convert into an electrical resistance.
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Would require additional circuitry. Most work the same principal as a liquid level sending unit.
Diaphragm driven wiper rubbing a resistance blade.
 
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Scott Danforth

Scott Danforth

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the free jet ski will cost you plenty of money.

did you get a remote for the lift? we talked about that almost 3 years ago.

however for the easy sensor. I use the oil pressure switch feeding my fuel pump for the oil pressure signal. its a 10 psi on rise and 7psi falling switch IIRC. the NO side for the relay, and the NC side for the alarm. I use a 220F temp switch for the block coolant temp, and I use the switch contacts in my oil temp sender for the oil temp side (250 F) . using one of teh $15 dash mounted light/horn deals

Erin should be far enough off shore not to worry.
 
nola mike

nola mike

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Scott Danforth said:
the free jet ski will cost you plenty of money.
Click to expand...
I am aware. project with the boy. figured it would be relatively simple, carb'd 2 stroke, right? "all it needs is a battery". and then sea doo entered the chat.

Scott Danforth said:
did you get a remote for the lift? we talked about that almost 3 years ago.
Click to expand...
still in the planning stages

Scott Danforth said:
however for the easy sensor. I use the oil pressure switch feeding my fuel pump for the oil pressure signal. its a 10 psi on rise and 7psi falling switch IIRC. the NO side for the relay, and the NC side for the alarm. I use a 220F temp switch for the block coolant temp, and I use the switch contacts in my oil temp sender for the oil temp side (250 F) . using one of teh $15 dash mounted light/horn deals
Click to expand...
interesting. hadn't thought to do that. wondering how annoying that alarm would be in practice.

Scott Danforth said:
Erin should be far enough off shore not to worry.
Click to expand...
anything off shore the winds get funneled up the river. maybe nothing, but I won't be there to monitor. I won't be upset if I over prepared.
 
Scott Danforth

Scott Danforth

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nola mike said:
interesting. hadn't thought to do that. wondering how annoying that alarm would be in practice.
Click to expand...
you get the alarm at key on until there is oil pressure when cranking. I did install an alarm silence button.

nola mike said:
I am aware. project with the boy. figured it would be relatively simple, carb'd 2 stroke, right? "all it needs is a battery". and then sea doo entered the chat.
Click to expand...
LOL. if you have good compression, the rest is fairly easy.
 
nola mike

nola mike

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Just to close this out. As promised, this was just a boredom/curious related thread. Haven't had a problem since I swapped out the sender. Finally got around to cutting open the old one. Looks like yet another victim of my boat's dunking (will the problems from that ever go away?). Most of that corrosion didn't affect the business of the sender. There looked to be enough corrosion on either the wiper or coils to presumably cause the intermittent failure. Very little pressure between the wiper and coils as well. Putting a multimeter from the wiper-->terminal had high/variable resistance. Running the lead across the coils had decreasing resistance closer to the terminal as expected.
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