Multiple spot PTD100 with PID control

[Mosaic]

Hi:
I need to control the temp of a large water bath, 6' by 4' by 4' within 2 Deg C., at around 90 C.

I was considering this controller:
https://www.amazon.com/Digital-Display-Temperature-Controller-Great/dp/B002PIM3R8/ref=pd_sim_misc_1

With this TC:
https://www.amazon.com/Premium-Stai...mistor-sensor/dp/B005OUJTZI/ref=pd_sim_misc_3

using 3 of these :
https://www.amazon.com/DC-AC-Solid-State-Relay-Heatsink/dp/B005K2IXHU/ref=pd_sim_misc_6
to run a center tank mounted, 3 Phase immersion 9.6KW heater.


The challenge is.... I need to monitor the 4 corners to ensure homogeneous heating based on a recirc pump. Is there a way to average the output of 4 of the TCs and then feed it to the PID controll, perhaps parallel 2 pairs of series TCs?

Thanks.

 

[ronsimpson]

This computer does not have a drawing program so with words:

You have 4 TC sensors. North, South, East, and West.

Wire N and S in series. This makes N+S read 2x higher than normal.
AND
Wire E and W in series. This makes E+W read 2x higher than normal.

Wire (N+S) and (E+W) in parallel. This cuts the readings in half.

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Method two:
Wire N and S in parallel. This makes N//S read 1/2x.
AND
Wire E and W in parallel. This makes E//W read 1/2x.

Wire (N//S) and (E//W) in series. This doubles the readings.
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This is about the same as adding the 4 reading up and dividing by 4. (average)