Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 157 / 268

MFC
Operation
5.
157
5.4.4 pH calibration
Please note
During pH calibration the buffer solution and the sample water
should have the same temperature. If there is a difference in
temperature of > 5 °C, first enter the temperature of the buffer
solution in the "Calibration" - “pH (1) ... pH (4)“ menu for the
measurement you wish to perform (Display 2.1.2 “Calibration -
Menu 2.1" on page 147) under "Cal. at temp.".
For buffer solutions, refer to “Automatic calibration" on page 200.
pH-7 alignment 1 Starting from the basic display in the main menu select the
"Calibration" menu.
2 Select the menu item “pH (1) ... pH (4)“ for the measurement
you wish to perform.
The "Calibr. pH" window (Display 2.1.2) appears on the
graphic display.
3 Select the "Cal. pH7" parameter.
4 Place one of the supplied beakers into the bottom clip and fill
with the buffer solution "pH 7.00" or a bag with buffer solution
"pH 7.00" into the bottom clip.
5 Pull or unscrew the pH sensor from the lid of the cell body.
6 Dip the pH sensor through the top clip at least 2 cm deep into
the buffer solution and move slightly until the indicated pH
value remains constant.
7 Enter the pH value associated with the buffer temperature
using the arrow keys or or leave pH 7.00.
8 Save the value by pressing "Enter".
Slope alignment 9 Remove the buffer solution "pH 7.00" from the bottom clip.
10 Wash the sensor in distilled water to prevent carry-over of the
buffer solution.
11 Select the parameter "Cal. pH" and confirm the selection.
12 Place a second beaker into the bottom clip and fill with the
buffer solution "pH 4.65" or clamp a bag with buffer solution
"pH 4.65" into the bottom clip.
Please note
If buffer solutions other than those stated are used, the pH value
of the buffer solution must be lower than pH 6 or higher than pH 8 .