Apera Instruments PH850, User Manual, Page: 5 / 20

3
(1) — Parameter mode icons
(2) — Measurement reading
(3) — Prompts of special display mode
(4) — Units of measurement
(5) — Temperature units (°C and °F)
(6) — Units of pH and conductivity calibration value
(7) — pH and conductivity calibration value, and prompts of special display mode
(8) — Temperature value, and prompts of special display mode
(9) — Temperature compensation icons
ATC — automatic temperature compensation, MTC — manual temperature compensation
(10) — Calibration guide icon
(11) — Stability icon of readings
(12) — Low battery icon, when this icon appears, please replace the battery
(13) — Automatic reading hold icon
3.2 Keypad Functions
3.2.1. Keypad operations
Short press ----- <1.5 seconds; Long press ----- >1.5 seconds.
Turn on the meter: Press to turn on the meter.
Turn off the meter: In the measurement mode, press and hold for 2 seconds to turn off the meter.
Note: In the calibration mode or the parameter setup mode, pressing is invalid. Please press
key to return to the measurement mode, then press to turn off the meter.
Diagram-3
Keypad