User manual

Calibrating with the electrode outside the flow cell

When calibrating the electrode out of the flow cell and changing

from one buffer to another, rinse the electrode tip with distilled

water and dab it carefully with a soft tissue to absorb the remaining

water. Do NOT wipe the electrode as this may charge it and give

unstable readings.

The steps below describe the procedure used with the electrode

removed from the flow cell.

Note: The user interface of the monitor must be unlocked if

connected to a UNICORN control system.

1 Remove the pH electrode from the flow cell and immerse the

electrode in the first standard buffer solution (normally pH 7.0).

2 From main menu 1, turn the dial four steps clockwise to

enter menu

Set Parameters. Press OK.

3 Select

Set Parameters pH . Press OK.

4 Select menu

Calibrate pH. Current calibration values are

displayed (buffer 1 - buffer 2).

Buffer 1=fixed lower calibrated pH value. Range=0.00-14.00

Buffer 2=fixed higher calibrated pH value. Range=0.00-14.00

Note: The pH values for buffer 1 and 2 must differ by at least 1 pH

unit.

5 Press

OK to access the settings menu. The order of calibration,

buffer 1 or buffer 2, is optional. Press OK to start with buffer 1,

or turn the dial to start with buffer 2. In this example, we start

with buffer 1.

6 This text disappears when the reading is stable and the

following text is then shown

7 Adjust the pH value in the display using the dial so that it

corresponds to the known pH value of the first buffer solution

and press OK.

8 Turn the dial clockwise to access the buffer 2 calibrating menu.

Rinse the electrode tip with distilled water and then immerse the

electrode in the second buffer solution (e.g. pH 4.0 or 9.0) and

press

OK.

Calibr pH Buffer 2

Calibr pH Buffer 1

Calibrate pH

(7.00 - 12.00)

Set Parameters

Monitor UPC-900

User Manual 18-1125-55 Edition AE

Operation 3