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LMP91000: How does the internal Rload impact the output of LMP91000?

Part Number: LMP91000

Hi dears,

My customer want to know about 4HS+ Hydrogen Sulfide sensor application.  

Here is the datasheet of 4HS+:

The recommended load resistor of this sensor is 5Ω, does this need match with the Rload internal of LMP91000? The internal Rload value could be set to 10Ω, 33Ω, 50Ω and 100Ω. How does the internal Rload impact the output  of LMP91000?  How to select the internal Rload value?

The customer said it's degree of linearity is not very well. The design is calibrated by a 61 ppm gas. Then use this design detect a 24.8 ppm gas, the output value is 13-14 ppm. 

Any comments or suggestions are welcome.

Regards,

Ricardo