MODEL 54e pH/ORP | SECTION 4.0 |
| CALIBRATION |
4.7 HOLD MODE
7.00pH
Hold Mode: Off
Placing the Controller on Hold for Maintenance. Before performing main- tenance or repair of the sensor, the Controller can be placed in hold (refer to Section 5.6 to enable this feature) to prevent process upsets while the reading is
Exit | Cont | Edit | Before removing the sensor from the process, press any key and then |
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| Enter (F4). When the hold mode has been enabled, the hold mode |
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| screen (on the left) will appear prior to calibration. To continue without |
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| putting the controller in hold, simply press Cont (F3). To put the controller |
| 7.00 pH |
| in hold, press Edit (F4), use the arrow key to change the "Off" to "On" and |
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| press Save (F4). | |
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| NOTE |
26.2°C 12.0mA
Hold Mode Activated
When the Hold Mode is activated ("On"), "Hold Mode Activated" will always appear on the bottom line of the display.
Always calibrate after cleaning or repair of the pH sensor. After installing the sensor back into the process, always change the Hold Mode setting to OFF.
4.8 TRIM OUTPUTS
Temp compensation pH slope
Output trim
ExitEnter
The instrument’s current outputs may be calibrated (trimmed) if neces- sary. If either the power board or the CPU board is replaced, the outputs must be calibrated. To perform this procedure, a calibrated meter must be connected to the output being calibrated.
To perform an output calibration, from the main display press any key to obtain the main menu. With the cursor on “calibrate,” press Enter (F4). With the cursor on “Output trim,” press Enter (F4) again. Select “Trim out- put 1” or “Trim output 2” as appropriate.
Press Edit (F4) to select Cal point 1 (4 mA expected and simulated) or Cal point 2 (20 mA expected and simulated). Adjust the Meter value to match the reading of the calibrated meter connected to the output. Press Enter (F4) to complete the calibration.
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