alpha-pH 1000
13
6.3
ORP -% Calibration
The ORP % mode allows you to calibrate at two points: a low concentration sample (20%) and a high
concentration sample (80%).
To calibrate the controller for ORP %:
1)
Enter Calibration mode. While in Measurement
mode, push the CAL key and scroll to Calibration Code
“11”. Push the ENTER key. The upper and lower display
reads “CAL OrP”.
2)
Note: If the upper and lower display read “CAL PH”,
see section 7.6.2 for procedures on how to switch from PH
to ORP mV readings.
3)
Press the ENTER key to begin calibration. The “CAL”
indicator appears on the display. The upper display shows
“80”. The lower display shows “C1” (= calibrated value
80%).
4)
Place sensor in the high concentration sample (relative
value of 80%).
5)
Press the ENTER key to confirm the value. The
electrode indicator and CAL indicator flash. The unit
automatically adjusts its reading to match the solution
value.
6)
The display will now show ‘20’ and “C2’. Remove the
electrode from the first standard, wash it well and then
immerse it in the 20% standard. When the display stabilises, press the ENTER key. The ‘CAL’
indicator flashes and the controller adjusts its display to the 20% relative value and exits to the
Measurement mode.
Note: If there is a calibration error, the controller displays “ERR”, and it will not automatically return
to Measurement mode. If this happens, push the
!
and
"
keys simultaneously (escape) to
restart the calibration beginning from step 1.
Note: If you stop calibration after entering the first value, or if calibration is defective, the controller
will use its original calibration data.
CAL
OrP
SETUP
HOLD
80
C.1
HOLD
CAL
20
C.2
HOLD
CAL
