13
A
dvanced
S
ensor
T
echnologies,
I
nc. U.S.A.
Website:
www.astisensor.com
IOTRON
TM
Trademark of ASTI
IOTRON
TM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate ORP Offset”
The manual calibration menu options are shown to the
right. The ORP offset can be performed with a ORP
standard or else used to allow for agreement between
the inline process reading and an offline grab sample
determination.
The current ORP reading and temperature are shown for
the selected channel in this screen along with the
existing current used offset calibration as well as the
time since this calibration was last performed.
Enter the value to which you wish to adjust the reading
of the ORP sensor. In the case that a ORP standard is
used the exact value at the current temperature should
be entered. Note that ORP measurements are not
temperature compensated but are in fact highly
temperature dependent. When calibrating this must be
taken into take.
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
calibration results will be shown and the time since
calibration will show as 0.00 days. The basic sequence of
events after pressing the calibrate button also occurs for
the temperature offset calibration as well.