Hach 51 Series User Manual page 19

Option
Zero calibration
bottle
Stop parameters
Configure manual calibration
1. Set the parameters for a manual sensor calibration:
Option
Calibration mode Select Zero calibration or High level adjustment. If using a high range sensor you also
Cal. sample
Medium
Gas unit type
Gas unit
Liquid
Reference value
Zero calibration
With this method, the sensor should be removed from the sample and exposed to pure N
recommended to use the specially designed portable calibration device for this purpose.
Press Start to start the calibration.
A screen is displayed showing the measured values and length of time the sensor has been under
calibration. These values are continually refreshed.
The value % last calibration is an informational message showing the difference between the
current and previous sensor calibrations.
The Signal within range and Stability reached boxes indicate whether the calibration is within
acceptable limits. When both boxes indicate YES, press Finish to accept the new calibration. If one
or both boxes continue to show NO you can still perform a calibration but it is not recommended
and the calibration should be aborted by pressing the Cancel button.
In the case of a calibration failure, attempt a second calibration after about 5 minutes. If the second
attempt also fails, then refer to your Hach representative for advice.
Note: If the Auto-End parameter is enabled then the calibration will be considered successful when the parameters
defined in Stop parameters are met.
If you have not accepted or cancelled the calibration after an elapsed time of 10 minutes then the
process will time-out.
100% humid air calibration (high range sensors only)
With this method, the sensor should be removed from the sample and exposed to air saturated with
humidity. Do this by putting a drop of water in the calibration cap before installing the cap on the
sensor. Press Start to start the calibration. The process is then the same as for the Zero calibration
described previously.
Description
Make sure this is disabled by unchecking the box as it is not relevant for this sensor.
If this button is pressed you can view or change the existing values or restore the
default values. It is highly recommended to leave these parameters at their default
values. These values apply to manual calibrations with the Auto-End parameter
enabled.
Description
have the option of 100% humid air calibration.
Note: If zero calibration or 100% humid air calibration is selected, no other parameters
are required. The following are only required for high level adjustment.
Set to In line sample, Gas bottle or Factory parameters. If factory parameters is
selected, the Ksv value is displayed but can be changed.
These additional parameters are required if in line sample or gas bottle has been
selected as the calibration sample:
This is automatically set to Liquid if in line sample has been selected as the calibration
sample, or Gas if gas bottle has been selected.
Either Partial or Dissolved are available for an in line sample. If gas bottle was selected
this is set to Fraction.
The list of available units depends on unit type selected above.
Select Water for the for the K1100 sensor (default) or Beer for the M1100 sensor.
Enter the reference value for calibration.
gas. It is
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