I did another measurement with the Derale sensor. Here are the results:

F C Derale/Target (Ohms)
106 41 25200
120 49 17000
130 54 13300
140 60 10000
150 66 8600
160 71 6400
170 77 5500
180 82 4500
185 85 4300
190 88 4000
195 91 3500
200 93 3300
206 97 2900
210 99 2700
212 100 2600

Here are the values of Mercedes sensor:

C MB Sensor (Ohms)
44.4 970
48.9 810
54.4 730
60.0 570
65.6 470
71.1 396
74.4 361
76.7 345
82.2 309
85.6 268
87.8 252
91.1 228
93.3 215
95.6 195
97.8 190
98.9 188
100.0 186

Note- I'm using the MB Sensor to feed into the DERALE adjustable relay. In short, I'd like to the DERALE relay to trigger the relay between 3500 -ohms (91C) and 3300-ohms (93 C).

The MB Sensor at 91C is approx 228-ohms; and at 93.3C approx. 215-ohms.

So- what can I do to use the MB Sensor with the Derale relay?

:-) neil