Channel Calibration
MXD70 Dissolved Oxygen
Setup and Operating Guide
- 25 -
Channel Calibration
If the sensor responds quickly enough, check that within another 3 minutes the current reading
has fallen to virtually zero. Then press the enter button in the zero calibration menu to calibrate
the new zero point.
Span Calibration in Free Air
The frequency of this check depends upon the application, but should be made generally once a
month.
Wash off any process chemicals or water from the sensor. Use de-mineralised water or follow the
manufacturers cleaning instructions as necessary.
It is recommended that % saturation is used as the calibration unit.
Stabilise the sensor by leaving it in the process solution for up to 10 minutes. This will allow the
temperature compensator networks to reach equilibrium.
Lift the sensor so that it is just above the process solution, and therefore as close to the
temperature of that solution as possible.
Select Sensor Span Calibration item in the input channel’s calibration menu and observe the
instrument readings and wait until the output stabilises. If necessary enable the sensor filter to
obtain a stable reading.
Once stable press the “ENTER” key and the unit will correct the span calibration to the user
selected span calibration point.
To Next Page
Loading...
Need help?
General
