Manual

handylab pH/LF 12 Operation

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 <M> 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).