femster87
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| posted on 7/2/12 at 09:42 PM |
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oil pressure senders
Am after some explanation on single terminal oil pressure senders. I presume the input voltage goes into the only terminal provided and the sender
earths at the engine. what about the signal relay back to the dash. How does this work? any info appreciated. Do apologize if its a dumb question jut
need to know
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PAUL FISHER
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| posted on 7/2/12 at 10:23 PM |
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Here you go, have a read through this.
http://www.sensorland.com/HowPage004.html
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femster87
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| posted on 7/2/12 at 10:33 PM |
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Thanks Paul I have read that but still cant find the reasoning behind single connection terminals on the sensor itself. Reason I asked is cause am
trying to calibrate my dash but my sensor has a single terminal. it was sold as a sensor with a operating range not a switch. So am a ittle bit
baffled as to the return signal to the dash
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needforspeed
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| posted on 7/2/12 at 10:39 PM |
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the resistance just changes as the pressure does? and earths out through the body what exactly do you need to know?
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twybrow
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| posted on 7/2/12 at 10:45 PM |
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Mine is exactly the same... One wire, and the sensor earths via the engine.
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femster87
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| posted on 7/2/12 at 10:49 PM |
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i understand that, but i have a separate lead for 5v to sensor and then another lead for input back into the dash. In this scenario there is nothing
to input back to the dash.
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needforspeed
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| posted on 7/2/12 at 10:54 PM |
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what dash are you using? i know my old stack worked like this but you shouldnt have to ise the 5v otherwise mite be an option in programming
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femster87
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| posted on 7/2/12 at 11:02 PM |
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Race tech dash2. There is a 100mA limit on the current u can pull from the dash. So the 5v reference from the dash with a right size resistor. I have
3 other sensors wire in already
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needforspeed
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| posted on 7/2/12 at 11:06 PM |
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Il have a quick scan tomO I'm actually running a dash 2 aswel just without the external sensors. What sensor is it you have?
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femster87
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| posted on 7/2/12 at 11:11 PM |
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its one this one. I believe they originated from smiths
http://www.kitspares.co.uk/shop/item.php?cat=11&product=5043&catsub=0
Thanks for the offer. Worst case I would have to buy a new 2 terminal one
[Edited on 7/2/12 by femster87]
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omega 24 v6
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| posted on 7/2/12 at 11:42 PM |
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On the rally car I did we had 3 sensors before we got the right one. A single wire on certainly was NOT the one that worked. I'll text the car
owner tommorrow if you want and ask if he as the part no still ( his was a dash2 as well).
ETA
You are measuring voltage and not resistance which is why you need a return as well as a feed to the sender. Some info here may help you
understand.
http://www.aim-sportline.com/download/doc/eng/sensors/Datasheet_VDOprs_103_eng.pdf
Also eta I checked and the sensor you require is on page 18 of this pdf. Insulated return without warning contact.
Choose your threadform and pressure range and thats it. You'll need to work out your resistor size to get the 100ma.
http://www.vdo.com/generator/www/com/en/vdo/main/hidden/downloads/replacement_parts/flc_sensors_instrumentation_en.pdf?redirect=false
[Edited on 7/2/12 by omega 24 v6]
[Edited on 8/2/12 by omega 24 v6]
If it looks wrong it probably is wrong.
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Dusty
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| posted on 8/2/12 at 12:54 AM |
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I have the sender on page 20 to go with a VDO gauge. It has a two wire contact for the gauge and a third wire that acts as a standard pressure switch
to operate the dash light.
These units are matched to VDO gauges and have a variable resistance from 10 to 180 ohms on the sender wires and a simple on/off for the oil light.
Only buy if your dash is programmable for that range.
Don't Race Tech do a sender?
[Edited on 8/2/12 by Dusty]
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femster87
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| posted on 8/2/12 at 08:09 AM |
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Thanks for the reply guys, Race tech do a calibrated pressure sender, but it would set me back about £100. I have a spreadsheet that does the
calibration as long as I have the working range of the sensor. I was just baffled as to wiring the sensor I got. It looks like a new sensor then.
Thanks alot
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snapper
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| posted on 8/2/12 at 01:16 PM |
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You need the sensor that matches the dash.
The sender you have is for single guage, the guage measures battery voltage and sender resistance subtracts from the two and the needle moves to the
pressure value
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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femster87
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| posted on 8/2/12 at 01:57 PM |
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quote:
Originally posted by snapper
You need the sensor that matches the dash.
The sender you have is for single guage, the guage measures battery voltage and sender resistance subtracts from the two and the needle moves to the
pressure value
Ahh so thats how it works. U learn something everyday. I have ordered a suitable one from VDO and would get it calibrated whe nit arrives
Cheers
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