Operating - ABB 8232 Instruction Manual

6.2.2 Operating Page 2
To gain access to the Calibration Page (Operating Page 2), operate the
Enable Auto Cals Yes
Enter
Cal
MANUAL CAL SEQUENCE
Cal
Ion Std 1
or
Enter
Cal
Ion Std 2 – –
or
Enter
Cal
Initiate Cal
No
Enter
Yes
Calibrating Std 1
Electrode mV
Enable Automatic Calibrations
Select 'Yes' to enable or 'No' to disable the automatic calibrations.
or
No
Store.
Advance to next parameter.
Page header.
Advance to next parameter.
Ion Standard 1
– – –
•
Set the value of the 'Low' standard solution (Std 1).
Low value ammonia standard solutions should be avoided. For example, at
ambient temperatures of about 25 °C, and under normal light conditions, a
-1
0.5 mg NH
seven day period. Because of the instability of such solutions, it is not possible to
programme a standard solution of lower concentration than 0.2 mg l
monitor. Solutions as low as 0.2 mg l
used immediately, making it an unsuitable concentration for long term use with the
monitor.
Store.
Advance to next parameter.
Ion Standard 2
– –
•
Set the value of the 'High' standard solution (Std 2). The concentrations of the two
standard solutions must differ from each other by a factor of at least four.
Store.
Advance to next parameter.
Initiate Calibration (manual)
Yes
Select 'Yes' to carry out a manual calibration or 'No' to return to the top of the page.
or
No
Enter must be pressed to initiate a manual calibration.
Calibrating Standard 1
The upper display shows the ammonia concentration value. The display remains
until a stable output is obtained from the probe.
Toggle between the two displays.
Electrode Millivolts
– – –
•
Note. Pressing
Cal
normal operation.
When a stable probe output is detected the display automatically advances to the
next parameter.
Continued on next page.
switch.
Cal
solution is expected to lose at least 10% of its concentration over a
3
–1 can be prepared with care, but must be
during a calibration aborts the sequence and returns to
Cal
6 PROGRAMMING...
–1 NH on this
3
13