ABB 4630, Operating Instructions Manual

Page: 20 / 40

18
Immerse Buffer 1
– – – – –
l 7 5
Calibrating Buf1
Immerse Buffer 2
– – – – –
l 2 9
Calibrating Buf2
–
(Calibration Message)
– – – – –
% Slope Value
SECURITY CODE
0 0 0 0 0
pH Check Value
Continued from previous page.
.
.
Return to
top of page
Select Buffer 2
7 0 0
.
l 0 0 0
.
9 0 0
.
…6 OPERATION
…6.2.3 Two-point pH Calibration (Automatic Mode)
Buffer 2
Select the non-ABB 7, 9 or 10 pH buffering solution.
✶
Note. The buffering solution selected for Buffer 2 must always be at least 1pH
value greater than the solution selected for Buffer 1; e.g. if Buffer 1 was set to 7pH, Buffer
2 must be set to either 9 or 10pH.
Buffer 1 Calibration
Immerse the electrode and temperature compensator in either the ABB 4pH buffer
solution or the non-ABB buffer 1 solution selected earlier.
Advance to initiate calibration. A flashing dot indicates that calibration is in progress.
The upper display line shows the sensor e.m.f.
• When a stable e.m.f. is detected and calibration is successful, the instrument
automatically advances to the next parameter.
• If a stable e.m.f. is not detected, the instrument automatically advances to the
Calibration Message
parameter and the message Slow Response is displayed.
• If calibration is not successful, the instrument automatically advances to the
Calibration Message
parameter and the appropriate message is displayed.
Buffer 2 Calibration
Immerse the electrode and temperature compensator in either the ABB 9pH buffer
solution or the non-ABB buffer 2 solution selected earlier.
Advance to initiate calibration. A flashing dot indicates that calibration is in progress.
The upper display line shows the sensor e.m.f.
• When a stable e.m.f. is detected, the instrument automatically advances to the next
parameter and the calibration message appropriate to the result of the calibration is
displayed.
• If a stable e.m.f. is not detected, the calibration message Slow Response is
displayed.
Calibration Message
Refer to Table 6.3 on page 20 for calibration message clarification. If the calibration has
failed, advance to the next two parameters for diagnostic information.
Advance to next parameter.
Slope Value
A value between the programmed minimum % slope value (see
pH Calibration Minimum
Slope Value
in the
Set Up Parameters Page
on page 25) and 105% should be displayed.
If the value is outside these limits the electrode system must be checked.
Advance to next parameter.
pH Check Value:
is displayed as an additional indication of electrode system condition; 7pH being the
optimum value for glass electrodes and 0pH for Antimony electrodes.
Advance to
Access to Secure Parameters
.