Xylem MULTI 3400 MULTI-PARAMETER METERS - Manual (Page 34)

Operation Multi 3400i
34
4.4 Conductivity
4.4.1 General information
Note
Conductivity measurements with the Multi 3400i 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 probe 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
The nonlinear temperature compensation is set fixed and is shown on
the display by nLF.
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 58.
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductiv-
ity measurement (status display
).
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 or calibrate the measuring in-
strument with the measuring cell (see below).
3 Check the selected cell constant (see below) or calibrate the
measuring instrument with the measuring cell (see section
4.4.5 on page 38).
4 Using <
▲ > <▼>, toggle between the measuring modes, con-
ductivity ( in
µS/cm) or salinity (SAL).