NEW BRUNSWICK SCIENTIFIC BioFlo 4500, Manual To Operations

Page: 126 / 214

BioFlo 4500 M1254-0050 User’s Guide
126
•
Select the pH control loop from the list by pressing on
pH
.
•
To set a “zero”, ensure that the
SET ZERO
function is selected, then
use the onscreen keypad to enter the appropriate value into the
ZERO
STD
text box. Use the
clr, +/- BUTTON
to clear any unwanted
information from the text box.
•
Immerse the pH probe into an external buffer solution with a nominal
pH of 7.00. Enter 7.00. Once the reading has stabilized, press the
SET
ZERO BUTTON
.
•
Immerse pH probe into a second buffer solution with a nominal pH of
4.00 or 10.00.
NOTE
:
A pH buffer should be selected that will linearize the equipment in
the range of the specific process. For example, if a process is run at
a pH of 8.00, then a buffer of pH 10.00 should be used to attain
optimal performance of the system. If the process is run at pH 5.5
than a buffer of pH 4.0 should be chosen for calibration.
•
To set span, ensure that the
SET SPAN FUNCTION
is selected, then
enter the appropriate value into the
SPAN
text box. Use the
Clr, +/-
BUTTON
to clear any unwanted information from the text box. Once
the reading has stabilized. Press the
SET SPAN BUTTON
. The value
entered will then become the span value.