Omega PHH444 User Manual page 6

"ATC" ICON INDICATION
Probe type ntc 10K (Default)
Plug in
Un-plugged
ATC icon
pH/mV CALIBRATION PROCEDURE and MEASURING
NOTE: When not use the electrode, it should immerse the "Electrode sensing head" into the "Protection bottle."
NOTE: Calibration is necessary before operation, the calibration procedures refer to as below" a) to b)" :
a) Required Equipment for calibration:
1) pH electrode.
2) pH buffer solution.
NOTE: Make sure to use fresh solution each time due to the contaminants in the solution will affect the
calibration and the accuracy.
b) Calibration Procedure:
1) Prepare the pH electrode, install the "probe plug" into the right "BNC port" of the meter.
2) Power on the meter by pressing PWR button.
3) Long pressing MODE + CAL buttons to enter pH calibration mode. Immerse the pH probe to pH buffer
solution. Meter will automatically recognize pH buffer values.
NOTE: Calibrating the pH in the incorrect buffer solution, "Er 3" will appear on the bottom of screen.
4) User can do 1, 2 or 3 points calibration.
Rinse the probe with de-ionized water before doing each pH buffer calibration.
If you are doing multipoint calibration, short pressing MODE button to select pH 4 or pH7 or pH 10
calibration mode.
HOLD: ↑to increase ADJ: ↓to decrease SET: ← to left digit CAL: → to right digit
Referring to the Adjust range as below:
Calibration Points Adjustable/Calibration range
pH4
pH7
pH10
NOTE: Before doing pH 4, 7, 10 calibrations, if the value is out of above adjustable range, the meter
displays "CAL Err". Please immerse the electrodes to distilled water or tap water to see if the value is
within the adjustable range first. After entering the calibration mode, immerse the electrode to
calibration solution to do the calibration.
5) Long pressing SET button to save and complete calibration, then screen shows "SA".
To escape calibration mode, long pressing MODE+CAL button, the bottom of screen will show "ESC" in few
seconds and return to normal measurement mode.
Temp. XX.X Temp. XX.X
"─ ─ ─" "─ ─ ─"
O
3.75 to 4.25
6.75 to 7.25
9.75 to 10.25
ntc 30K not
Manual
temp.
O X
4