Simple-In real time Temperature Differential Notification

Hello I lost my way and hoping you may guide me back.
I will appreciate you expert time and advice. it will be put to very good use. I started this project a few years back with the main gold of accuracy, 0.5F or better. I have selected 1wire family project as my final gold. In achieving 8 eight sensor location at one object, detecting .025F between any relationship, as well as 4 four sensor locations, and 3 sensor locations. That being said, Right now Im using LM932N, and my gold is 2 two sensors comparison differential, Using 2 thermistors on one location, I would like to have you suggestions to this circuit improvements to LM392 to choice from, any reference material I can refer to. I did pick this out but have problems understanding what and why. Thank You for you Input

All The Best

What are you measuring the temperature of ?
What is the data to be used for ?
Can you post the general circuit design you have produced so far ?

Mr Bushnell, Thank you for your interest. Temperature of ? > many surfaces = liquid, air, metals, and skin.
Data used for ? > again many = some materials may work there best displacing limited amounts of temperature, alerting on there relationship to limits of work the perform will lead to performance efficiency. As skin produces heat or lack of in a range of difference may indicate an early indicator to watch. At this point it is the data gathering it its simplest accurate form.

I enclosed file
Changed NPN 2N2222 to PNP 2N4403 and removed 100K @ 5 to Ground,

Thank You
All The Best

Hi again, my computer cannot figure out what application to open your file with ! Can you let me know ? Thanks !

Very Sorry Inclosed wil be a pdf

Thant for you patients

I think pin 4 needs to go directly to ground, as it is the ground for the IC's power supply.
When the two sensors are at the same temperature, the output from the op-amp will be indeterminate.
The nulling pot on pin 2 may need to be between two equal resistors to provide an intermediate voltage level. (1/2 Vcc ?)
Rather than just a comparator giving an on/off, it may be more useful to have an output that is proportional to the temperature difference that is sensed, perhaps to drive a display showing the magnitude of the temperature difference..
I am not very hot on temperature sensing, so anyone else who has any ideas is welcome to chip in.

Thank You for you information it is Very helpful a display would be excellent. I choose this IC believing it is a good choice at the time 4 yrs ago I have since gotten a little lost in understanding my circuit.

Im hoping you will comment on my over all solution. circuits are in excellent range -10>85 c or -55>125c with .05 accurate are excellent. Working Range for accuracy range of work in ( -5 > 5 C ) .5 or better accurate. set point of floating differential (-8.33c ) (17f ) in increments (.3c) (.5f) alerting each way. What would benefit my solution to construct a solution is the source of information how the chips external parts effect works to evaluate the out put. more straight forward than technical. Any suggestions or directions will be very helpful.

Thank You
All The Best

EVERYTHING you need to know operational Amplifiers

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Excellent Reference