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MODEL 54e pH/ORP SECTION 5.0
SOFTWARE CONFIGURATION
5.8 ON-LINE DIAGNOSTICS SETUP (continued)
5.9 AUTO CALIBRATION SETUP
2. Menu Item Options
Autocal Standard/ DIN 19267/ Manual
Stabilize pH 0.01-0.50 pH
Stabilize time 0-30 sec
The values now being used by the controller are displayed. To change
any of these items, use the arrow key to highlight the desired item and
press Edit(F4). Use the arrow keys to make the change and press Save
(F4) to enter the change into memory.
The pH reading must not change by more than the stabilize pH value over
the stabilize time to be considered stable. Using a smaller pH value and
a larger time provides the best protection against calibration while the
reading is still changing.
"Cal warn" compares the on-line glass impedance with the value meas-
ured at the last buffer calibration. This setting should be set to 0 (dis-
abled).
"Imped comp" is used to compensate the glass impedance for tempera-
ture changes. This is especially important at temperature extremes.
NOTE
The actual on-line values of the sensor diagnostics are available
on the controller under the "Diagnostic Variables" header in the
main menu (regardless of whether the messages have been
turned on in this section).
This section describes how the controller may be set up for auto calibra-
tion, which includes automatic buffer recognition and auto stabilization.
Alternatively, the controller may be configured to perform a manual cali-
bration without the automatic features.
1. Beginning from the main menu, move the cursor down to "Program"
and press Enter (F4). From the program menu, move the cursor
down using the arrow key to highlight "Configure" and press Enter
(F4).
Use the arrow key again to highlight "Auto Calibration" (as shown on
the left) and press Enter (F4).
NOTE
There are three buffer groups that may be selected. Automatic
buffer recognition includes temperature curves from 0 to 60°C.
a. Standard: Includes NIST (US), BSM (Britain), JIS 8802 (Japan) and
DIN 19266 (Germany) buffers. See Table 5-2 for details.
b. DIN 19267: 1.09/4.65/6.79/9.23/12.75
c. Manual: (for manual calibration) disables automatic buffer recognition
and stabilization.
Autocal: Standard
Stabilize pH: 0.01 pH
Stabilize time: 10 sec
Exit Edit
Diagnostics
Auto Calibration
Security
Exit Enter
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