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Share temperature sensor between two reglators?

PostPosted: Sat Jun 19, 2010 5:58 pm
by petedd
I have a Smart 3-step regulator and a V3, for my engine and 12V genset/scuba compressor. Can the #2018 temperature sensor be shared between the two units. I am getting a stack of sensors on my battery (and I can't find my second temperature sensor... (I know it will show up as soon as I order another one...)

PS: Love the step-down feature of the V3. I use this to back down the alternator when the electric clutch on the scuba compressor kicks in. Brilliant!

Re: Share temperature sensor between two reglators?

PostPosted: Mon Jun 21, 2010 11:01 am
by Coulomb
The sensor can be shared as long as both regulators stay powered up. If one shuts off then the temperature read by the other will be bogus.

Re: Share temperature sensor between two reglators?

PostPosted: Mon Jun 21, 2010 6:48 pm
by petedd
Thank you for the prompt reply.

By "on" do you mean it has B+ and ground or do you specifically mean that the On/Off terminal has power (the manual says that the On/Off terminal controls power to the alternator field circuits)?

Since I read that the temp sensor has a voltage drop of 2.98 V at 25 deg C and a slope 10mV/deg C, I would guess the sensor is just an LM335Z encased in a battery lug. Simple enough for me to whip up and I probably have some already in my parts box.

Thanks again.

Re: Share temperature sensor between two reglators?

PostPosted: Fri Jun 25, 2010 7:29 am
by petedd
Coulomb,

By "on" do you mean it has B+ and ground or do you specifically mean that the On/Off terminal has power (the manual says that the On/Off terminal controls power to the alternator field circuits)?


Pete

Re: Share temperature sensor between two reglators?

PostPosted: Sun Jun 27, 2010 10:04 pm
by Coulomb
It needs power on the B+ input.