User Guide
Instruction Manual pH 1000/ 2500
9
6.1.3 Option 2 - Non-Standard Buffers
1. Press CAL EDIT key after entering into pH calibration mode.
The buffer icon blinks at the bottom left hand corner of the
LCD. Select the buffer value by entering the value directly via
the keypad numeric keys. For example, 9.18. The value
entered is displayed in the secondary display. Please ensure
the correct pH buffer sample is available during calibration.
2. When reading stabilizes, a [READY] annunciator is displayed
on left hand side of the LCD. Note this READY annunciator will
be displayed after you have activated this function prior to
measurement or calibration. For details refer to Section 7.1.
3. Press YES to confirm calibration or NO to cancel and re-enter.
Upon confirmation, the CON indicator flashes at the top right
hand side of the LCD to indicate that the instrument is now
calibrated to the selected buffer. The secondary display
automatically scrolls to the next pH buffer option.
4. You have performed one-point calibration using non-standard
buffer option successfully after pressing YES key. To resume
to measurement mode, press CAL/MEAS key while in the
calibration mode. The primary display shows the calibrated pH
buffer value (in this case, pH 9.18) and the secondary display
shows the measured temperature value.
6.2 Multi-Point pH Calibration (Up to 5 Points)
1. Follow steps 1 to 4 of “1 Point Calibration”.
2. If your 1 Point Calibration began with the default buffer value of
pH 7.00 (@ 25
o
C), then the meter automatically scrolls to the
next value, pH 4.01. The next value automatically shown is
1.68 after which the value scrolls round to 12.45 and then
10.01 and back again to 7.00.
3. To select the second buffer you wish to calibrate at, use S or
T key to scroll through the buffer options.
4. Follow steps (2) to (4) of the 1 Point Calibration procedure until
the entire buffer values that you wish to calibrate are complete.
Do not press CAL/MEAS key until all calibration is complete.
5. Press CAL/MEAS key when all calibrations are complete to
return to the measurement mode. Display now shows MEAS.
Important: OR Indicator
The ERR indicator flashes if the buffer value is
not within +/-1 pH of the measured buffer
value. This indicator also flashes if the buffer
value is different from that shown on the
secondary display.