Xylem handylab pH LF 12 - Manual (Page 35)

handylab pH/LF 12 Operation
35 ba75370e03 11/2009
4.4 Conductivity/Salinity
4.4.1 General information
Caution
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 Only carry out measurements with a temperature probe. The temperature
probe 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 TEMPERATURE , page 61.
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductiv-
ity measurement (status display
ӕ
or SAL).
If the conductivity measuring cell is already connected, press
the key repeatedly until the status display
ӕ
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 (
ӕ
in
μS/cm) or salinity (SAL).