12
7.46
Press the
SELECT
button up or down to adjust to the Slope value
of the solution.
7.47
Press
ENTER
to confirm set value, wait a while for an endpoint
reading to establish and press it again to calibrate to the point.
7.48
The remaining slope values will alternate on the main display.
7.49
Repeat step 7.43 to 7.47 in sequence. You can calibrate up to 4
slope points.
7.50
At least 2 calibration point (offset & slope) must be established in each session
of calibration. Otherwise, calibrated point will not register.
7.51
When calibration is completed, press
EXIT
to resume measuring
mode.
8
MAKING PH MEASUREMENT:
Measurement with Auto-Lock feature enabled:(see Page 4)
8.1
Always rinse the pH electrode and temperature probe with
distilled-water before and after each test.
8.2
Dip the pH electrode and temperature probe in the test sample
and press the
READ
button once.
8.3
Display will show current pH reading with
AutoLock
symbol blinking.
8.4
When the
AutoLock
sign stops with short beep, an endpoint reading
is established. You can now record the reading.
8.5
Press the
READ
button for each new measurement.
Measurement with Auto-Lock feature disabled: (see Page 4)
8.6
When feature is disabled, meter will display readings continuously.
8.7
Press the
READ
button once to freeze displayed reading.
8.8
The
HOLD
symbol will appear. Press again will release display and
resume continuous measurement.
pH measurement without ATC (Manual temperature compensation on sensor error)
8.9
If ATC is not required, disconnect the temperature probe.
ATC
symbol will not appear on screen and display will show the default
temperature of 25ºC.
8.10
You can also manually set the solution’s temperature as follow:
8.11
Press the
READ
button start measuring, then
press and hold down
MODE
button until temperature reading appears blinking.
Note on Measurements and Analysis:
Each type of liquid has its own pH value varies at different temperature. ATC
measurement only compensates for the pH sensor’s error, it does not compensate
for the pH variation due to temperature fluctuation in the liquid. Therefore, each
test should be made at the same temperature if possible or recorded with
temperature reading for a comprehensive analysis.
