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I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivityan electro-conductivity K10 probe. so theThe range is 10 uS/cm to 1 S/cm, and an operating tempaturetemperature of 0-70 CelciusCelsius.

So equations gave me a working resistance of ~80 ohms to 19M ohms. I'm thinking that given the range of resistance it might be diffucultdifficult to have a single resistor to compisatecompensate.

Also I'm using a 1k Thermistorthermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

____/\/\/\_____thermistor____ |||gnd
|     ?     |    probe
(5v dc)   mcu

I've played aroundaround; seems a 10k is more accurate in getting the value of the thermistor.

So if iI have known solutions, and a known probe the resistance should be in theory known. A K 10 probe and a .15 S solution should come out w/ 1.5 ohm?, or would it be ohm/cm?

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

____/\/\/\_____thermistor____ |||gnd
|     ?     |    probe
(5v dc)   mcu

I've played around seems a 10k is more accurate in getting the value of the thermistor.

So if i have known solutions, and a known probe the resistance should be in theory known. A K 10 probe and a .15 S solution should come out w/ 1.5 ohm?, or would it be ohm/cm?

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and an electro-conductivity K10 probe. The range is 10 uS/cm to 1 S/cm, and an operating temperature of 0-70 Celsius.

So equations gave me a working resistance of ~80 ohms to 19M ohms. I'm thinking that given the range of resistance it might be difficult to have a single resistor to compensate.

Also I'm using a 1k thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

____/\/\/\_____thermistor____ |||gnd
|     ?     |    probe
(5v dc)   mcu

I've played around; seems a 10k is more accurate in getting the value of the thermistor.

So if I have known solutions, and a known probe the resistance should be in theory known. A K 10 probe and a .15 S solution should come out w/ 1.5 ohm?, or would it be ohm/cm?

    Bumped by Community user
    Bumped by Community user
    Bumped by Community user
    Bumped by Community user
    Bumped by Community user
4 deleted 71 characters in body
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I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

   ____/\/\/\_____thermistor____ |||gnd
   |     ?     |  
   (5v dc)   mcu

I'm having issues figuring out how this circuit would measure ec

_____________ec probe ____ |||
|       \
|       / resistor
(5v dc)   mcu adc 

wouldn't the voltage be the same across both resistors? even if one is huge?

I've played around seems a 10k is more acurateaccurate in getting the value of the thermistor.

So if i have known solutions, and a known probe the resistance should be in theory known. A K 10 probe and a .15 S solution should come out w/ 1.5 ohm?, or would it be ohm/cm?

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

   ____/\/\/\_____thermistor____ |||gnd
   |     ?     |  
   (5v dc)   mcu

I'm having issues figuring out how this circuit would measure ec

_____________ec probe ____ |||
|       \
|       / resistor
5v dc   mcu adc 

wouldn't the voltage be the same across both resistors? even if one is huge?

I've played around seems a 10k is more acurate in getting the value of the thermistor.

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

____/\/\/\_____thermistor____ |||gnd
|     ?     |    probe
(5v dc)   mcu

I've played around seems a 10k is more accurate in getting the value of the thermistor.

So if i have known solutions, and a known probe the resistance should be in theory known. A K 10 probe and a .15 S solution should come out w/ 1.5 ohm?, or would it be ohm/cm?

3 added corrected ec diagram
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optimal Voltage dividers for measuring ec/thermistor

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

   ____/\/\/\_____ probe ____\_____thermistor____ |||gnd
   |     ?     |   thermistor
   (5v dc)   mcu

I'm having issues figuring out how this circuit would measure ec

_____________ec probe ____ |||
|       \
|       / resistor
5v dc   mcu adc 

wouldn't the voltage be the same across both resistors? even if one is huge?

I've played around seems a 10k is more acurate in getting the value of the thermistor.

optimal Voltage dividers for

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

   ____/\/\/\_____ probe ____ |||gnd
   |     ?     |   thermistor
   (5v dc)   mcu

I've played around seems a 10k is more acurate in getting the value of the thermistor.

optimal Voltage dividers for measuring ec/thermistor

I'm trying to find the optimal, or at least a good resistor to put into a voltage divider to measure a thermistor, and a Electro Conductivity K10 probe. so the range is 10 uS/cm to 1 S/cm, and an operating tempature of 0-70 Celcius.

So equations gave me a working resistance of ~80 ohms to 19M ohms I'm thinking that given the range of resistance it might be diffucult to have a single resistor to compisate.

Also I'm using a 1k Thermistor, and was wondering if in that case a 1k would be the optimal resistor to pair with that as well?

   ____/\/\/\_____thermistor____ |||gnd
   |     ?     |  
   (5v dc)   mcu

I'm having issues figuring out how this circuit would measure ec

_____________ec probe ____ |||
|       \
|       / resistor
5v dc   mcu adc 

wouldn't the voltage be the same across both resistors? even if one is huge?

I've played around seems a 10k is more acurate in getting the value of the thermistor.

2 added a rudimentry diagram...
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1
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