36
The calibration of the D.O. concentration range can only be performed at a single custom point
(4 to 50 mg/L). It is recommended to calibrate the D.O. sensor close to the values that will be
measured. Choose “DO calibration” from the “Calibration” menu, select the D.O. calibration type
using the / keys and press
Select
to confirm.
% D.O. saturation
The calibration of the % D.O. saturation range can be performed at a single or 2 standard points
(0 % and 100 %), or at a single custom point (50 % to 500 %).
Procedure:
• To calibrate at 100 %, fill the calibration beaker with approxi‑
mately 4 mm (5/32") of water and screw it onto the probe. The
membrane should not be wet. This condition corresponds to air
100 % saturated with oxygen and water vapor.
• The reading, temperature, calibration point and the “Not
ready” message are displayed.
• Once the reading has stabilized the countdown timer will
count down until the display shows the “Ready” message.
• Press
Confirm
to accept the calibration point. After
confirmation, put the D.O. and temperature sensors into
HI7040
zero oxygen solution and wait for stability to be reached. The stability timer will count
down and
Confirm
will appear. Press
Confirm
to store the calibration.
• 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.
Notes: The user can perform a single point calibration by pressing ESC after the first point is
accepted.
If the D.O. input is not within the acceptable range, the message “Invalid input” is dis-
played.
D.O
. CALIBRA
TION (HI98194, HI98196 only)
Summary of Contents for HI98194
Page 9: ...9 SENSOR AND PROBE INSTALLATION ...
Page 25: ...25 SETUP MENU STRUCTURE ...
