3.3.4 Span Gas Calibration
Before beginning the span gas calibration, make sure the oxy.IQ is
indicating an O
accurate calibration. Then, start the flow of the span gas to the
sensor. For accurate calibration, the span gas should have an oxygen
content of 70-90% of the range being calibrated.
To perform the span calibration, complete the following steps:
1. Use the equation below to calculate the expected mA output that
corresponds to the known oxygen content of the span gas:
For example, if the span gas contains 80 ppm oxygen and the
0-100 ppm range is being calibrated, the analog output should equal
4 + 16 x (80/100) = 16.8 mA.
2. If you have not done so already, start the flow of span gas to the
sensor and allow both the 4-20 mA output reading and the
display reading to stabilize.
3. After the reading has stabilized, press the
the Main Menu.
4. Press the
5. Press the
Span Gas menu option.
6. Press the
span calibration gas value.
7. Confirm that the reading on the display has stabilized, and press
key to save the calibration. Then, press the
key twice to return to measurement mode.
oxy.IQ User's Manual
level less than the span gas value, to ensure an
Span Gas ppm
Full Range ppm
key to enter the Calibration menu.
key and then press the
keys until the measurement agrees with the
Chapter 3. Initial Setup & Operation
key to enter
key to select the