Race Technology

Hi All

I've managed to find some of the VDO sensor data for their pressure and temperature sensors. I've posted it here - http://mysite.orange.co.uk/swiftr1/vdo_sensor_data.htm

Regards

Wyn[/url]

I just did some calibration work on some more VDO temp senders.

The equation on the 120* is pretty good, not so much on the 200* one. It is a 400*F sensor and I can only get to 210*F boiling water. Assuming they behave the same, an exponential equation is best.

120*C
Ohm = 1850.5e-0.0183(TempF)

TempF Ohms
77 472
140 140
145 128
150 118
155 110
160 100
177 70
180 67
190 59
196 52
200 50
210 41


200*C - I took some more data and found a recording error. Equation is much better now

Ohm = 7950.0 e^(-0.0195*TempF)

Temp Ohms
72 2370
77 1985
115 795
117 700
125 650
130 659
136 608
139 455
140 465
150 405
160 344
170 273
175 258
175 250
177 250
180 236
183 230
190 198
190 198
200 150
200 164
205 157
210 150
210 148

(bad data....)
200*C
Ohm = 8269.7e-0.02(TempF)

TempF Ohms
77 1985
115 795
117 700
125 650
130 659
139 455
177 350
200 150
205 104
210 150
210 118

osborni wrote:I just did some calibration work on some more VDO temp senders.

The equation on the 120* is pretty good, not so much on the 200* one. It is a 400*F sensor and I can only get to 210*F boiling water. Assuming they behave the same, an exponential equation is best.

120*C
Ohm = 1850.5e-0.0183(TempF)

TempF Ohms
77 472
140 140
145 128
150 118
155 110
160 100
177 70
180 67
190 59
196 52
200 50
210 41


200*C - I took some more data and found a recording error. Equation is much better now

Ohm = 7950.0 e^(-0.0195*TempF)

Temp Ohms
72 2370
77 1985
115 795
117 700
125 650
130 659
136 608
139 455
140 465
150 405
160 344
170 273
175 258
175 250
177 250
180 236
183 230
190 198
190 198
200 150
200 164
205 157
210 150
210 148

(bad data....)
200*C
Ohm = 8269.7e-0.02(TempF)

TempF Ohms
77 1985
115 795
117 700
125 650
130 659
139 455
177 350
200 150
205 104
210 150
210 118

Are you working in °c or in °f. Your post is a bit confussing.
What kind of resistor are you using? This has effect on your equation.
The site with the VDO data does not work anymore. Could someone send me the data for a 120°c sensor? Or is the first table in the previous post correct?

Greetz

Patrick

It's in F and it's just the Ohm reading per temperature. It's up to you to figure out what the pull up resistor rating needs to be. I haven't had time to do that yet - working on a steering sensor first.

Do you have the value's for a 0 to 120°C VDO sensor?

it's the one at the top of my data post.