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MODEL 54e pH/ORP SECTION 4.0
CALIBRATION
This procedure is followed if Autocal is set to "Manual" in Section 5.9.
Buffer values are entered manually and no stabilization check is used.
1. From the main display, press any key to obtain the main menu. With
the cursor on "Calibrate", press Enter (F4). With the cursor on "2-pt
Calibration", press Enter (F4) again.
NOTE
The Hold Mode screen may appear if the feature was enabled in
Section 5.6. Changing the Hold Mode to ON holds the outputs in
a fixed state, and avoids process upsets during calibration.
2 . Place the sensing portion of the pH sensor into a beaker containing
the first buffer solution. The large displayed pH shows the actual pH.
3. Allow the pH and temperature to stabilize. This may take several min-
utes, as the pH sensor may need to cool down to the buffer temper-
ature. The display will flash “wait’ while the reading is stabilizing.
When the pH reading is stable, press Cont (F3) to update the read-
ing. Press Edit (F4) and use the arrow keys to change the indicated
buffer value to the correct value for the buffer at the stabilized tem-
perature. The pH values at various temperatures are written on the
label of most buffer bottles.
4. Press Pt 2 (F3) to enter Buffer 1 into memory and proceed to buffer
2 (pt. 2) calibration.
NOTE
Press Abort (F1) to cancel buffer calibration and return to the cal-
ibration menu.
5. Remove the sensor from buffer 1 and rinse in water.
6. Place the pH sensor into a beaker containing the second buffer solu-
tion.
7. Allow the pH and temperature to stabilize (as before) and press Cont
(F3). The display will flash “wait’ while the reading is stabilizing.
8. Enter the correct value for buffer 2 as described in step 3 and press
Save (F4) to complete the calibration. Reinstall the sensor.
CALIBRATION NOTES
1. A two-point calibration should always be followed by a sin-
gle-point calibration (see Section 4.4)
2. After a buffer calibration, the electrode slope value can be
checked to see if the electrode is aging.
3. If the sensor is not at the same temperature as the buffer the cal-
ibration will be in error.
4. If the hold mode is ON, be certain to reinstall the sensor in the
process and change the setting to OFF to return to normal oper-
ation.
4.3 MANUAL TWO-POINT CALIBRATION
2-pt calibration
Standardize pH
Adjust temperature
Exit Enter
4.01
pH
Pt. 1: 04.00pH 25°C
Pt 2 Edit
4.01
pH
Calibrate point 1
Abort Cont
10.01 pH
Calibrate point 2
Abort Cont
10.01 pH
2-pt calibration done
Esc Save