Cerlic pHX, Руководство пользователя, Страница: 16 / 24

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• If smart calibration is used and BB2 recognizes the buffer, BB2 will suggest a pH
value showing the text ”Accept smart calibration pH X.X”. You can choose to
accept the value or to change it manually.
• If manual calibration is used BB2 will always ask for the value of the buffer, enter
the value and press ENTER.
• The second buffer is not accepted if it is less than 1 pH from buffer 1, if so the
second calibration will be repeated.
• When the calibration is finished the slope is shown in the display. "Slope XX%".
This gives an indication of the shape of the electrode. A good electrode will have a
slope between 93 and 102 %
• Press ENTER to finish the calibration.
Adjusting ORP
The ORP sensor is not calibrated, an offset adjustment is done instead. The offset
adjustment can be done in two ways automatic or manual. Irrespective of the way you
chose, you need a buffer with a known potential.
Remove the sensor and, if necessary the electrode as well, but make sure that the
electrode is still connected to the signal amplifier. Wipe clean the electrode before
adjustment.
• Spray the electrode using clean water, then immerse it in the first buffer, and wait
for a stable reading.
• Enter the sensor menu. The output is frozen when the menu is opened.
• Open the “Calibrate” menu, then select "Adjust", chose "Set” and press ENTER.
• A window pops up asking for the ORP potential. Enter it and then press ENTER.
BB2 will calculate the difference and use it as offset.
14. Scaling
The “Scale / Alarm” menu allows the user to set the high and low boundaries for a 4-
20mA output signal. In addition, this menu allows the user to set high and low alarms
values that can be used to notify when solids have reached critical points.
Max sets the 20 mA point output
Min sets the 4 mA point output (may be a negative value for special
applications)
High-Alarm sets the High Alarm set point
Low-Alarm sets the Low Alarm set point