Bio-Rad BioLogic LP System - Manual (Page 51)

44
System Operation
5.2.5 Manual Mode Operation of the Conductivity Monitor
Table 10 discusses the Conductivity Monitor’s Manual mode operation. Figure 19 provides an overview.
Table 10.
Manual Mode Operation: Conductivity Monitor
Reference Description
To manually control the Conductivity Monitor:
a.
From the Mode keys select Manual.
b. From the Instrument keys select Cond.
c. The main menu for manual control of the Conductivity
Monitor is shown below.
The display shows the following:
•
Conductivity Monitor: The current Conductivity reading.
• Range: The chart range for Conductivity detection.
Description of the soft key choices follows.
Set Range: Allows you to increase/decrease the full scale con-
ductivity value (in millisiemens) for the conductivity output to the
chart recorder. For example, when the range is set to 100.0
mS (millisiemens), the chart recorder pen will be at its highest
(“full scale”) when the conductivity of the sample in the flow cell
is 100 millisiemens per centimeter. The following Set Ranges
are available: 500.0, 200.0, 100.0, 50.0, 20.0, 10.0, 5.0, 1.0,
and 0.5 mS.
Calibrate: Allows you to calibrate using either of the following
values:
•
Constant: When a conductivity flow cell is installed for the
first time, use this selection to enter its cell constant into the
system. Enter a constant value (less than 100) using the
numeric keypad. Each cell is labeled with a cell constant.
The nominal cell constant is 40.
• Solution: Use this selection to calibrate the system using a
solution of known conductivity. (This may be a solution for
which conductivity was determined using a benchtop con-
ductivity bridge, or a solution purchased specifically to pro-
vide a conductivity standard.) Fill the flow cell with the
solution, and then enter its conductivity value. Calibration
solutions should be between 10 and 100 mS/cm.
Method: <<name>> Manual Operation
Conductivity Monitor: 0.0111 mS
Range: 500 mS
SET RANGE CALIBRATE MIN/MAX
MU
M3 M1 M2
Method: <<name>> Manual Operation
Conductivity Monitor: 0.0111 mS
Range: 500.0 mS
INCREASE DECREASE CANCEL OK
M1
MU
MU
(Increment/decrement
the range by
approximately 50%
each time the button
is pressed)
Conductivity Cell Constant: 40.0000
(constant) SOLUTION CANCEL OK
M2
MU
MU
(Calibrate using
Constant value or
value of Solution)
Manual Cond