Calibration types, Calibration procedure – Hach-Lange SENSION+ MM374 User Manual
Page 10
Option
Description
Calibration
type
pH: Calibration type—select Technical buffers,
DIN19266 Buffers, User Buffers, To a X value, data
introduction or Theoretical calibration.EC: Calibration type
—select Molar Standards, Demal Standards, NaCl
Standards, Calibration to a X value, data introduction or
Theoretical calibration. Refer to
Calibration types
for more
information.
Cal. frequency
Calibration reminder—can be set between 0–7 days
(default daily). The display shows the remaining time to
the new calibration. Refer to
on page 11 for more information.
Display mV
Display mV—select YES or NO to show mV.
Calibration types
Different calibration types can be selected.
1. From the main menu use the or to select CALIBRATION.
Confirm.
2. Use the to enter the calibration menu.
3. Use the or to select Calibration type.
Option
Description
Technical buffers
pH 2.00, 4.01, 7.00, 9.21 and 10.01 at 25 °C
(77 °F)
DIN19266 Buffers
pH 1.679, 4.006, 6.865, 7.000, 9.180, 10.012 and
12.454
User Buffers
Selected when the technical or DIN19266 buffers
are not used. Refer to
on page 19 for pH values of
specific buffer sets at varying temperatures.
Calibration to a X value To adjust manually any scale value of the
measured pH or conductivity.
Data introduction
Manual probe constant introduction.
Option
Description
Theoretical calibration
pH: The probe calibration data is replaced at
25 °C (77 °F). EC: The probe calibration data is
replaced with C=1.000 cm
-1
Molar Standards
147 µS/cm, 1413 µS/cm, 12.88 mS/cm and
111.8 mS/cm at 25 °C (77 °F)
Demal Standards
1049 µS/cm, 12.85 mS/cm and 111.31 mS/cm at
25 °C (77 °F)
NaCl Standards
1014.9 µS/cm 25 °C (77 °F)
Calibration procedure
This procedure is for general use with liquid calibration solutions. Refer
to the documents that are included with each probe for additional
information.
Note: Solutions should be stirred during calibration. For more information about the
stirring settings, refer to
on page 13.
Note: If Channel 1 is used as a double channel (pH and EC) the temperature will
be measured by the conductivity cell with integrated ATC. The conductivity cell
must be immersed in the pH buffer solution as well during the pH calibration.The
manual temperature modification is not possible.
1. Pour the buffers or calibration solutions into the labeled calibration
beakers.
2. From the main menu use the or and and to select the
CALIBRATION parameter. Confirm.
3. If required select the Operator ID (1 to 10) and confirm.
4. Rinse the probe with deionized water and put the probe into the first
calibration beaker. Be sure that there are no air bubbles in the
membrane.
5. Push to Start calibration.
6. Push to measure the first calibration solution.
The next calibration solution is shown.
7. Rinse the probe with deionized water and put the probe into the
second calibration beaker. Be sure that there are no air bubbles in
the membrane.
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