5
“High” is set for stability for longer time, “Low” is set for stability for shorter
time. User can select suitable stability criteria according to different testing
requirement.
3.5 Automatic Lock Display Mode
Select
On
from parameter P4.6 to turn on automatic lock-up display function.
When the reading value stabilizes more than 10 seconds, the meter locks the
measuring value automatically and displays
HOLD
icon, see Diagram – 5.
In the
HOLD
mode, press to release lock-up.
3.6 Automatic Power-off
The meter will be power-off if there is no operation for 20 minutes. The time of auto power-off can be set in
parameter setting P3.2
3.7 Manual Temperature Compensation (MTC)
When the temperature probe does not connect to the meter, long press key, temperature value flashes,
then long press key or short press key to change the temperature value in one way, and press
to confirm the temperature value to achieve Manual Temperature Compensation (MTC).
4
pH Measurement
4.1 pH Electrode Information
The meter connects to 201T-F plastic three-in-one combination pH electrode with built-in temperature
sensor, with automatic temperature compensation function. Electrode housing is made of polycarbonate
engineering plastics, which is corrosion and impact resistant. The BNC socket of electrode connects pH
socket. RCA socket connects temperature socket. When dipping pH electrode in the solution, please stir
the solution briefly to eliminate any air bubbles and allow it to stay in the solution until the reading is
stable
Note:
The 201T-F Combination Glass pH/temp. Electrode is only suitable for general water solutions’ pH
measurement. For special applications such as low ion concentration or complex solutions, please refer to
Section 10
to find the most suitable pH electrode model.
4.2 pH Calibration Consideration
4.2.1. Standard buffer solution
The meter uses two series of standard buffer solution: USA series and NIST series, 3 solutions for each
series which are corresponding to calibration indication icons. Please see Chart - 3 for the two series of
standard buffer solution.
Diagram - 5
Summary of Contents for PH850
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