Apera Instruments PH850, User Manual, Page: 6 / 20

4
Chart -1 Keypad operations and descriptions
Keypad Operations Descriptions
Short press " #
In the power-off mode, press this key to turn on the meter
Long press
#
In the measurement mode, press and hold this key for 2 seconds to
turn off the meter.
Short/long press
Select measurement parameters:
#
PH850 pH meter:
→
#
In the measurement mode: long press to enter manual temperature
compensation mode, then long press or momentary press this key
to change the temperature value (only one direction).
"
#
In the parameter setup mode, press this key to change the serial
number of the main menu and the submenu (only one direction)
#
In the submenu mode, press this key to change parameters and
setup (only one direction)
Short press
"
#
In the measurement mode, press this key to enter the calibration
mode
#
In the calibration mode or the parameter setup and auto lock-up
(HOLD) mode, press this key to return to the measurement mode
Short press
#
In the measurement mode, press this key to enter the parameter
setup main menu
"
#
In the calibration mode, press this key to make calibration
#
In the parameter setup mode, press this key to select programs
"
3.3 Meter Socket
Chart-2 Sockets for Meters
3.4 Reading Stability Display Mode
When the measuring value is stable, smiley icon stays on LCD,
see Diagram – 4. If the smiley icon does not appear or flash, please do
not get the reading value or make calibration until the measuring value is
stable. Per parameter P1.3, there are 3 criteria for stability standard:
(Normal), (High), and (Low). The factory default is set “Normal”.
Models Photos Description
PH850 pH meter
"
● BNC socket (right) — connect
pH electrode or ORP electrode,
●
RCA socket (middle) — connect
temperature probe
Diagram- 4