10
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
SUMMARY OF CORRECT SEQUENCE FOR CALIBRATION OF HiQDT pH SENSOR WITH BUFFERS
1.
Perform temperature calibration (manual mode only)
2.
Select the three pH buffers to be used to perform the calibration (See Appendix A, B & C)
3.
Perform
pH ‘Offset’
Calibration (Autoread or Manual) a.k.a. Asymmetric Potential abbreviated as A.P.
4.
Perform
pH ‘Acid Slope’
Calibration (Autoread or Manual)
5.
Perform
pH ‘Alkaline Slope’
Calibration (Autoread or Manual) a.k.a. Base Slope
6.
If desired, perform adjustment for agreement with laboratory reference value of process grab sample
with pH ‘Offset’ mode. Account for all temperature induced effects if this last step is performed.
“Calibrate Sensor Menu”
All sensor calibrations can be shown from the
“
Display Current Calibrations
” selection. The
“
Autobuffer Calibration
” is only valid for pH
sensors. The “
Manual pH/ORP & Auto DO
Calibration
” mode is valid for all sensors. “
Adjust
Sensor Dampener
” and “
Reset All Calibrations
”
tools are also valid for all sensor types. The “
D.O.
Sensor Setup
” allows changing salinity and air
pressure values used to compute percent saturation.
For faster calibration operation you can temporarily
adjust the sensor dampener to a shorter time than
when it is in field use for continuous measurements.
“Display Sensor Calibrations”
The calibration values for the sensor in the current
working channel can be shown in this screen.
Simply click on the Current Working Channel
shown in blue and choice the channel that you wish
to view if the desired selection is now what is
shown. Finally to view the current calibrations then
click “
Get Calibrations
” button and the values for
the selected channel will be shown.
The calibrations will be loaded as appropriate for the
given sensor type that is assigned to that channel. In
the case shown to the right a calibration was very
peformed fairly recently and so the time since
calibration is shown as 3.17 days. If this display
sensor calibrations screen is shown immediately
after calibration then the time since calibration
should show as 0.0 days instead.