Hanna Instruments pH 300, Инструкция по эксплуатации, Страница: 24 / 57

47 46
• Set the simulator to
"390.0 mV".
Wait for 5 seconds and press
CFM to confirm the value.
• T h e p r i m a r y
LCD will display
"
- 3 9 0 . 0
mV".
• Set the simulator to
"-390.0 mV".
Wait for 5 seconds and press
CFM to confirm the value.
• The primary LCD will
display "
1000
mV".
• Set the simulator to
"1000.0 mV".
Wait for 5 seconds and press
CFM to confirm the value.
• The primary LCD will
display "
-1000
mV".
• Set the simulator to
"-1000.0 mV".
Wait for 5 seconds and press
CFM to confirm the value.
The mV calibration process is complete and
the meter will return to the normal operating
mode.
CFM
mV
°C
CAL
CFM
mV
°C
CAL
CFM
CFM
mV
°C
CAL
The meter has been factory calibrated for the
mV and is ready for measurements. The cali-
bration data are stored in the EEPROM.
The ORP electrodes are interchangeable and
no mV calibration is needed when the ORP
electrode is replaced.
If, for any reason, the mV measurements are
out of accuracy, re-calibration should be car-
ried out as follows.
INITIAL PREPARATION
Prepare a simulator with an accuracy of
±0.1 mV that can provide:
• ±390.0mV and ±1000.0mV for pH300
• 0.0 mV, ±500.0 mV and ±1500.0 mV for
pH301 and pH302 .
PROCEDURE FOR pH 300
• Connect the meter to the simulator through
the connection cable (connect it to the
BNC electrode socket).
• Turn the pH 300 on by pressing ON plus
CFM simultaneously.
Note: this calibration can also be per-
formed immediately after the tem-
perature calibration (see page 50).
• The primary
LCD will display
"
390.0
mV".
mV CALIBRATION
ON
CFM
mV
°C
CAL