37
D.O
. CALIBRA
TION (HI98194, HI98196 only)
Single point Custom % saturation calibration
• For a calibration at another known value place sensor and temperature probe into the known solu‑
tion and change the calibration value, press the
Cal. point
softkey and select the desired point.
• To insert a different calibration value, press
Cal. point
and then
Custom
. Insert the desired value
using the keypad, then press
Accept
.
• When the reading is stable, the “Ready” message is displayed. Press
Confirm
to store the
calibration point.
• The following messages will appear: “Storing” and “Calibration completed”.
• Press
OK
to return to the “Calibration” menu.
• Press
ESC
twice to return to the main menu.
• Press
Measure
to return to the measurement screen.
D.O. concentration (HI98194, HI98196 only)
Verify the barometric pressure, conductivity and temperature
reading are correct. Calibrate them if necessary. To calibrate the
D.O. concentration range, a solution with known dissolved oxygen
concentration value is needed. The solutions used to calibrate
with, should be determined independently (for instance by
Winkler titration). Place the D.O. sensor with temperature sensor into the known solution.
• From the “DO calibration” menu, select the “DO concentration” option, insert the known
concentration. Allow the sensors to reach thermal equilibrium with the solution. Stir or agitate if
possible to keep fresh solution in front of the membrane and press
OK
.
• When the reading is stable, the stability timer will count down and
Confirm
will appear. Press
Confirm
to accept the value.
• When the messages “Storing” and “Calibration completed” appear, the calibration is completed.
To return to the “Calibration” menu, press
OK
.
• To return to the main menu, press
ESC
twice.
Summary of Contents for HI98194
Page 9: ...9 SENSOR AND PROBE INSTALLATION ...
Page 25: ...25 SETUP MENU STRUCTURE ...
