17
2
．
RS485 Communication Setup
This unit uses MODBUS protocol to transmit data over RS-485. After entering the
“RS485 Communication Setup” interface, the “HI 2” shall lit up. Press [Up] or
[Down] key and choose between the three MODBUS protocol options of “None”,
“Odd” and “Even”. Press [Enter] and return to the measurement interface.
H. Conductivity/Resistivity Calibration mode
The model 3351 uses 1-point calibration for conductivity or resistivity.
In the
Measure mode
, pressing
[UP]
key and
[ENTER]
key at the same time to allow
the meter to go to the
Conductivity / Resistivity calibration mode
.
At the
Conductivity / Resistivity calibration mode
, the “
CAL
” icon and a
conductivity/resistivity reading will display. Rinse the conductivity probe in distilled
water and immerse it into the standization solution. Allow temperature reading to
stabilize, press
[UP]
key or
[DOWN]
key to change this reading to that of the
standization solution value, then press
[ENTER]
key to save. Calibration is now
completed.
