Hach 51 Series User Manual Download Page 19

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Option

Description

Zero calibration
bottle

Make sure this is disabled by unchecking the box as it is not relevant for this sensor.

Stop parameters

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.

Configure manual calibration

Set the parameters for a manual sensor calibration:

Option

Description

Calibration mode

Select

Zero calibration

High level adjustment

. If using a high range sensor you also

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.

Cal. sample

Set to

In line sample

Gas bottle

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:

Medium

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.

Gas unit type

Either

Partial

Dissolved

are available for an in line sample. If gas bottle was selected

this is set to

Fraction

Gas unit

The list of available units depends on unit type selected above.

Liquid

Select Water for the for the K1100 sensor (default) or Beer for the M1100 sensor.

Reference value

Enter the reference value for calibration.

Zero calibration

With this method, the sensor should be removed from the sample and exposed to pure N

gas. It is

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

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.

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