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O2 Sensors & Wiring, Charlie;   3:15

O2 Sensors & Wiring, John;   2:05

O2 Sensors Science & Support;   4:35

O2 Sensors Programming & Data;   5:20

The following is correspondence with Apogee Tech Support on
calibrating and programming the oxygen sensors.

Call them anytime for support with the O2 sensors, they are always eager to help and have their equipment perform as you need.

They are also experts with Campbell equipment, and the programming and wiring of Apogee sensors to their data loggers.

John Huber

Sep 21, 2023, 4:32 PM

Hi John,


That sounds like a solid plan.  The customer will definitely need to run their own calibration procedures since any calibration you set for them will be most accurate at your office, but the office slopes and intercepts can at least be used to get some more generic measurements to see if the sensors are working once they arrive on site.


Adding in variables to the program that the customer can adjust later would help them make quick changes to the program later when they have new slopes and intercepts from the onsite calibrations can help too.


The equations to get the slope and intercept are listed below:


Slope:   CF = 20.95% / (mVc - mVo)


Where mVC is the sensor voltage at 20.95% (51.1 in your example) and mV0 is the voltage at 0% oxygen (3.0 if we use the generic offset for an SO-110).  For this example, CF should be ~0.436

Intercept = mVo * CF * -1


Which results in an offset value of -1.308


This means that the linear equation for this slope and intercept is:

O2m = CF * x - Intercept


Where x is the sensor’s voltage output in millivolts.


If it helps, these formulas along with others can also be found in the sensor manual starting on page 13:


Best wishes,

John Huber

Technical Sales Support

721 W 1800 N Logan, UT 84321

Desk: 435.799.3067
Main: 435.792.4700   fax: 435.787.8268

Detailed Product Manual and Specs

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