I am trying to build a temperature gradient apparatus for a laboratory experiment using 2 Peltier devices (approximately -15 C to -5 C gradient). High stability is needed. I have two Omega CN745 analog proportioning PID temperature controllers that output 4mA - 20mA DC control signal. I was thinking that I would be able to find an amplifier board that would have the control signal input, DC power input, and a proportioned output signal to power TEC. I am having a hard time of finding such a product and was looking for some advice. Should I be using a time proportional type temperature controller with a relay instead? In this case, I worry about stability as well as cycling the TEC on and off.
I am using a TEC1-12707HT
Imax = 7.4A
Umax = 15.4 V
Qmax= 75W
Any guidance on this project is be appreciated.
I am using a TEC1-12707HT
Imax = 7.4A
Umax = 15.4 V
Qmax= 75W
Any guidance on this project is be appreciated.