7
7.2 Parameter setup method
When turned off, long press to enter parameter setting→Short press to switch P1-P2-
…P7→Short parameter flashing→Short press to choose parameter→Short press
to confirm→Long press to switch off.
7.3 Parameter setting instruction
a) 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 clause 4.7.
b) Heads-Up Function (P2 and P3)
For example, the following
■ Alarm when measured value ≥ 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 LCD); LCD displays red backlight.
■ Alarm when measured value ≤ 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 LCD); LCD displays red backlight.
■ Alarm when measured value in range of 6.50 pH and 7.20 pH:
Preset lowest value (P2) = 6.50 pH, highest value (P3) = 7.20 pH, when measured value in range
of 6.50 pH and 7.20 pH (stable displays on LCD); LCD displays red backlight alarm.
c) 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. Press key to
cancel reading hold.
d) Backlight (P5)
“Off”-turn off backlight, “On”-always turn on backlight, “1”- backlight will last for 1 minute.
e) Factory default setting (P7)
Select “Yes” to recover instrument calibration to the theoretical value (pH value in zero potential is
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