You are all invited
After having captured you minute attention with this statement; what IC’s would you recommend to capture the AC current sensing.. and the temperature sensing (thermistor).. ?
I do have some samples coming from TI (I had already received some INA128P samples an the INA1101HP have just been posted). I Have also secured a couple of OP177FPZ – would you have any better suggestions?
The AD620 series had also crossed my mind..
I am also being gratuitously rewarded with some A/C current sensor samples from the Coil people.
The AC current sensor will only be used to “back-off” the integral part of the PID controller, as I do want the “I” not to “kick-in” until the desired temperature is almost reached to avoid it’s saturation. The “D” part of the circuit will be present but not employed, as in this application I am dealing with a considerable “time” delay within the process (heaters). The “D” would be maintained only for the purpose of the versatility of the controller.
The temperature - is of the paramount importance.
A 0.1 deg C would be appreciated the most. I have seen the Digikey having on offer an excellent temp sensor, but at the price outperforming the total cost of hardware intended for this project. I do believe, a thermistor is accurate enough to maintain even better sensing if “tuned” to the temp range required.
The employed sensors may sound like an “overkill” for a system with a considerable time delay, but I do not feel it as being hurtful to provide “the best” from sensors maintaining the versatility of the PID at the same time.
I do look forward to your input..
Regards,
xanadunow
PS. I do keep the use of SMTs for the simplicity of testing - not.
After having captured you minute attention with this statement; what IC’s would you recommend to capture the AC current sensing.. and the temperature sensing (thermistor).. ?
I do have some samples coming from TI (I had already received some INA128P samples an the INA1101HP have just been posted). I Have also secured a couple of OP177FPZ – would you have any better suggestions?
The AD620 series had also crossed my mind..
I am also being gratuitously rewarded with some A/C current sensor samples from the Coil people.
The AC current sensor will only be used to “back-off” the integral part of the PID controller, as I do want the “I” not to “kick-in” until the desired temperature is almost reached to avoid it’s saturation. The “D” part of the circuit will be present but not employed, as in this application I am dealing with a considerable “time” delay within the process (heaters). The “D” would be maintained only for the purpose of the versatility of the controller.
The temperature - is of the paramount importance.
A 0.1 deg C would be appreciated the most. I have seen the Digikey having on offer an excellent temp sensor, but at the price outperforming the total cost of hardware intended for this project. I do believe, a thermistor is accurate enough to maintain even better sensing if “tuned” to the temp range required.
The employed sensors may sound like an “overkill” for a system with a considerable time delay, but I do not feel it as being hurtful to provide “the best” from sensors maintaining the versatility of the PID at the same time.
I do look forward to your input..
Regards,
xanadunow
PS. I do keep the use of SMTs for the simplicity of testing - not.
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