eutech-instruments alpha ph 100 phorp controllertransmitter User Manual

11

complete the pH  calibration, as fo pH 7.0. Press MODE
key to return to measurement mode.

Note : If the pH value is not near
to any buffer, pressing ENTER will
not calibrate the controller. If at
any point, you decide not to
calibrate, you can return to the
previous mode by pressing the
MODE key.

If the controller calibration has
drifted, you can reset the offset of
controller. First, go to the
calibration mode. Press ENTER
when pH7 is being displayed and
the present pH value is shown
(blinking). Using the ▲ or ▼ key,

change the current pH to 7.0. Press ENTER to confirm, and it
resets the pH calibration curve completely.

NOTE :  Gently stir the electrode in a container filled with buffer
solution to create a homogenous sample. Remember to rinse
the electrode before calibrating to the next solution. Minimum
two points calibration is recommended. For full range accuracy,
three points calibration is advised.

This is useful for on-line operations. For example, the
controller while in use shows a reading of pH 8.4. Using a
pre-calibrated portable meter, a measurement is made and
the reading shows pH 8.6. The offset of controller can be set
to 8.6 by going into the CAL mode. While the controller
displays “PH7”, press ENTER. The current reading will be
displayed. Using the ▲ or ▼ key, change the reading to pH
8.6 to reset the offset. Press ENTER to confirm offset setting.
Press MODE key returns to the controller back to the
measurement mode. This allows a one-point calibration to be
made while the controller is still in operation to adjust for
slight drifts of the controller. For details, prefer to Appendix 3.

SETUP

MODE

ENTER

CAL

SETUP

MODE

ENTER

PH

SETUP

MODE

ENTER

7.0