Option
Description
Hold during calibration
On by default, this stops any output from the instrument during the calibration
process to avoid sending invalid information to any connected device.
Automatic calibration
stop
If selected, when the stability criteria is reached, the calibration process stops
automatically.
Interference enabled
If selected, this takes into account the influence of interferences during
calibration. By default the same interference as during measurement is
selected.
2.
Press
OK
to start calibration
• A calibration screen will be displayed showing current measurement data which is continually
refreshed.
• The value “% ideal current” is a percentage of the current against the ideal current for the
membrane type selected. If this percentage is not within the accepted range, an error message
is displayed and the calibration process fails. A warning message can be displayed when this
value is close to the boundaries, but when calibration can be accepted.
• The message is first displayed in the result box. The dialog box with the error message or the
warning is displayed when the finish button is pressed.
• The value “% last calibration” shows the ratio between the current measurement and the
previous sensor calibration.
• The value “% variation” indicates the variation during the last 3 measurements, which is the
stability of the measurements. A variation as low as possible is needed for a precise
calibration.
• The display shows the actual calibration parameters, and the actual readings (temperature,
barometer, current).
Barometric pressure calibration
Note: The barometric pressure sensor has been factory calibrated but should be periodically verified with a
precision certified barometer. The barometric pressure is necessary for the O2 sensor calibration. Make sure that
the barometric pressure is correct before the sensor calibration. If necessary, calibrate the barometric pressure.
The upper box shows the barometric pressure as measured by the instrument.
Using a precision certified barometer measure barometric pressure in the location where the
measuring instrument is used. Compare the values and if they are the same press
Cancel
, otherwise
enter the new barometric pressure value in the lower box and press
Validation
to validate the new
setting.
Other menus
For information on setting up relays and analog outputs refer to the full user manual (Inputs/Outputs
menu).
For information on setting up RS485, PROFIBUS-DP, USB, HTTP/TCP-IP and attached PRINTER
links refer to the full user manual (Communications menu).
For information on setting up products and global configurations refer to the full user manual
(Products and Global Configuration menus).
Maintenance
Instrument maintenance
C A U T I O N
Personal Injury Hazard. Any instrument maintenance should be carried out by a qualified Hach Service
Technician. Please contact your local representative should you feel any maintenance or instrument adjustments
are required.
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