18
• The pH calibration offset.
• The pH calibration slope (the GLP slope is the average of the calibration
slopes; the percentage is referred to the ideal value of 59.16 mV/pH).
• The pH calibration buffers in calibrating order and with the selected
resolutions at calibration moment.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer:
The fourth pH calibration buffer:
The fifth pH calibration buffer:
31
• Use the
ARROW
keys to set the reading on the secondary LCD to that
of the hot water.
•
When the reading is stable and close to the selected
calibration point, “
READY
” tag will appear and
“
CFM
” tag will blink.
• Press
CFM
to confirm. The instrument will memorize calibration and
restart to measurement mode.
Note:
If the reading is not close to the selected calibration point,
“
WRONG
” tag will blink. Change the temperature probe and
restart calibration.
mV CALIBRATION
(for technical personnel only)
All the instruments are factory calibrated for mV.
Hanna’s ORP electrodes are interchangeable and no mV calibration is
needed when they are replaced.
If the mV measurements are inaccurate, mV recalibration should be
performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the instructions below.
A two-point calibration can be performed at 0.0 mV and 1800.0 mV.
• Attach to the BNC connector a mV simulator with an accuracy of
±0.1 mV.
• With the instrument off, press and hold down the
CAL &
ºC
keys, then power on the instrument. The “
CAL
” tag will appear and
the secondary LCD will show “
0.0 mV
“.
• Set 0.0 mV on the simulator.
When the reading is stable and close to the selected calibration
point, “
READY
” tag will appear and “
CFM
” tag will blink.
• Press
CFM
to confirm. The secondary LCD will display
“
1800 mV
“
.
• Set 1800.0 mV on the simulator.
When the reading is stable and close to the selected calibration
point, “
READY
” tag will appear and “
CFM
” tag will blink.
• Press
CFM
to confirm. The
instrument will
memorize calibration and
restart to measurement mode.