Hi Everyone,
I'm designing a CO Detector by LMP91000EVM and NAP-505(NEMOTO). But every time when I turn on the CO device in normal environment ( 1013hPa, 27℃), I think the CO concentration is lower than 2 PPM in normial environment. Our device always drifts between 1~6ppm. I think I am still picking up noise. Do I approach the limits of LMP91000EVM?? I want to get stable value in normal environment.
My configure of LMP91000 is as below :
Vdd = 5V (Power Supply)
Vref = 2.5 V (source external)
Vref_Div = 20%
INT_Z = 0.5V
RTIA_GAIN = 10K ,±0.1% (external resistance)
BIAS = 0%
Rload = 10 ohm
OP_MODE = 3-lead amperometric cell.
and NAP-505 is 40nA/ppm.
Please help!!
