Hello Sir
I am using LMP91200 IC for pH as well as ORP sensing.
For pH sensing range is -500 mV to +500 mV, it works fine.
But for ORP sensing Range is -2000mV to +2000mV,Can I directly apply this -2000mV to + 2000mV. to input pins of LMP91200IC(i.e; Pin no 5 & Pin no. 8).
Hi Akshay,
As you may know the LMP91200 is optimized for pH sensing applications. That may explain the good results there.
For you other application the voltage swing is too high since the dynamic range is limited tp the spec below:
pH Buffer Input Bias Current
(–500 mV < VINP– VCM < 500 mV),
VS = (VDD – GND) = 0 V
For alternative solutions please refer to the e2e post below, same topic with different solutions is discussed.
Regards,
Jose
