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8.2 Parameter Setup
When turned off, long press
to enter parameter settings → Short press
to switch P1-P2-P3…P7 → Short press
to select parameter (starts flickering) → Short press
to change parameter → Short press
to confirm the change → Long press
to return to
measurement mode.
8.3 Parameter Setting Instruction
8.3.1 Select standard pH buffer solution (P1):
There are two options of standard buffer solutions: USA series and NIST series. Factory default
is USA series, for details see section 4.2.
8.3.2 Alarm Function (P2&P3):
a) Alarm triggered when measurement ≤ 3.20 pH:
Preset lowest value (P2) = 3.20 pH, highest value (P3) = 14.00 pH, when measured value ≤ 3.20
pH (stable displays on screen); screen turns red.
b) Alarm triggered when measurement ≥ 8.60 pH:
Preset highest value (P3) = 8.60 pH, lowest value (P2) = 0.00 pH, when measured value ≥ 8.60
pH (stable displays on screen); screen turns red.
c) Alarm triggered when measurement ≤ 3.20 pH or ≥ 8.60 pH
Preset lowest value (P2) = 3.20 pH, highest value (P3) = 8.60 pH, when measured value is lower
than 3.20 pH or higher than 8.60 pH (stable displays on screen), screen turns red.
8.3.3 Automatic Lock (P4): Select “On” to activate auto lock function. When reading is stable for
more than 10 seconds, the tester will lock the value automatically, and HOLD icon will display on
LCD. Short press
key again to cancel the lock and keep measuring.
8.3.4 Backlight (P5): “Off”-turn off backlight, “On”-always turn on backlight, “1”- backlight will last for
1 minute.
8.3.5 Temperature Unit (P6): Select between C˚ and F˚.
8.3.6 Factory default setting (P7): Select “Yes” to recover instrument calibration to the theoretical
value (pH value in zero potential is 7.00pH, slope is 100%), parameter setting return to initial
value. This function can be used when instrument does not work properly in calibration or
measurement. Calibrate and measure again after recovering the instrument to factory default
status.
9. ORP Measurement
ORP stands for Oxidation-Reduction Potential. ORP is a measure of the cleanliness of the water &
its ability to break down contaminants. An ORP probe is needed to test ORP (sold separately, SKU:
AI1207). After powering on the tester, press
to enter ORP mode (mV). Rinse the probe in distilled
water and dry it. Dip the probe in your sample solution, make a quick stir, and hold still. Record the
reading after it is fully stabilized.
