coozer
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| posted on 27/12/09 at 08:15 PM |
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WTD: Thermometer
Hello peeps,
I need a thermometer to measure the resistance of the temp sensors on my zetec for the MS conversion.
Advice on best type and where to get one from please.?
Ta,
Steve
1972 V8 Jago
1980 Z750
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luke
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| posted on 27/12/09 at 08:23 PM |
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measuring resistance with a thermometer? 
would suggest a lab suppliers, get a proper one with mercury and a decent scale.
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RichardK
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| posted on 27/12/09 at 08:27 PM |
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Cant you get a multimeter on it whilst the sender is in a pan of cold water, then boil the water and get a resistance value and do some maths?
Or am I missing something, probably am, drunk far too much tonight !!
Cheers
Rich
Gallery updated 11/01/2011
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rayward
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| posted on 27/12/09 at 09:11 PM |
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quote:
Originally posted by RichardK
Cant you get a multimeter on it whilst the sender is in a pan of cold water, then boil the water and get a resistance value and do some maths?
Or am I missing something, probably am, drunk far too much tonight !!
Cheers
Rich
yeah all you need is a mulitimeter, do the zero (wet ice 0 degrees ) and span (boiling water 100 degrees) everything in between should be linear !
hth
ray
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turbodisplay
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| posted on 27/12/09 at 09:17 PM |
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Its not linear - in fact far from it.
Look up ms forums, the zetec sensor should be about 27k at 25c.
My cosworth v6 sensors haves the same calibration.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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mark chandler
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| posted on 27/12/09 at 09:37 PM |
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I used megatherm that needed three values, dipped the sensors in water with ice and measured.
Dipped the sensors in boiling water and measured
mixed the icy cold water in same quantities to the boiling water so ~50degrees and measured, its works fine for my MS system.
Regards Mark
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paulf
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| posted on 27/12/09 at 09:40 PM |
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Zetec sensors are 27k at 20c , the best way is to change the sensor bias resistor on the MS pcb to match.
I found a near match to the original spec for the water temp and then fitted a thermistor from RS that matched the resistance curve for the air
temp.
The water temp is not as critical as the air temp as the water just controls the warm up enrichments , the important one is the air temp as that
directly controls fuel air ratio.
Paul.
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austin man
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| posted on 27/12/09 at 09:53 PM |
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Maplins should do one
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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coozer
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| posted on 27/12/09 at 10:15 PM |
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Cheers Mr. Austin, I understand all the other bits, just need the thermo so I know what to put in the MS!
I do have a multimeter but need a thermo so I know what temp I'm measuring at!
Back to the cans ta....
1972 V8 Jago
1980 Z750
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Volvorsport
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| posted on 27/12/09 at 10:39 PM |
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multimeter with a K type thermocouple attatched ?
www.dbsmotorsport.co.uk
getting dirty under a bus
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rusty nuts
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| posted on 28/12/09 at 09:20 AM |
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Or just have a look in a Autodata fuel injection manual , it should give all the information you want without any messing about
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britishtrident
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| posted on 28/12/09 at 11:18 AM |
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Maplin sell loads of different types or buy an electronic cooking thermometer from Sainsbury's --- less than a tenner.
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