Xylem MULTI 3400i pH/Cond MULTI-PARAMETER METERS - Manual (Page 33)

pH/Cond 3400i Operation
33
4.4 Conductivity/Salinity
4.4.1 General information
Note
Conductivity measurements with the pH/Cond 340 can only be carried
out using the TetraCon 325 measuring cell.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
Preparatory activities Perform the following preparatory activities when you want to measure:
Temperature sensor The TetraCon 325 conductivity measuring cell has a temperature sen-
sor integrated in it. The temperature sensor is shown on the display by
TP.
Temperature
compensation
Selectable linear or nonlinear temperature compensation, can be
switched off (see section 4.8 C
ONFIGURATION ).
Reference temperature,
Tref
The reference temperature (Tref) can be switched between 20 °C and
25 °C. It appears on the display as Tref20 or Tref25. To switch over the
reference temperature, see S
WITCHING OVER THE REFERENCE TEMPERA -
TURE , page 60.
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductiv-
ity measurement (status display
or SAL).
If the conductivity measuring cell is already connected, press
the <M> key repeatedly until the status display
or SAL ap-
pears.
2 Check the selected cell constant (see below) or calibrate the
measuring instrument with the measuring cell (see
section 4.4.5).
3 Using <
▲ > <▼>, toggle between the measuring modes, con-
ductivity ( in
µS/cm) or salinity (SAL).