Calibration
PC tool name: SmartPC(DO).exe. (
Please scan the QR code on
the right to download the application software).
Note: If custom development is needed, please contact
Yosemitech Customer Service.
Calibration Solution Preparation
Preparation for zero oxygen environment:
take 200mL distilled water and pour it into the
prepared beaker, then add anhydrous sodium sulfite, add and stir at the same time, until
anhydrous sodium sulfite is insoluble and solid crystallization occurs, then the standard
solution can be regarded as close to 0 oxygen.
Preparation for 100% oxygen environment:
Prepare 1 beaker, take 200mL purified water
(or distilled water) and pour it into the cup, add to the air pump, and fully aerate the solution
(at least 30 minutes).
Note:
If the field conditions really do not allow, the sensor can be directly put into the air
(calibration accuracy will be slightly deviated).
Calibration (take 2-point calibration as an example)
Restore user calibration data by default, K=1, B=0(see modbus documentation for
details).
Take the sensor out of the zero oxygen, wipe the sensor measurement end face with a paper
towel, put the sensor into 100% environment (air), read the value of dissolved oxygen, wait
for the data to stabilize, the value is close to 1 (Saturation is 100%), and record the value as Y.
Place the sensor in the prepared zero-point solution, immerse the front end of the sensor
completely in the solution, read the value of dissolved oxygen, and wait for the data to
stabilize, with the value approaching 0.01 (Saturation is 1%), for example
Dissolved oxygen = 0.015, recorded as X.
Record K and B values according to the following formula:
K=(1-0)/(Y-X), B= - KX
Write K, B values to the sensor.
