Xylem handylab LF 12 - Manual (Page 18)

Operation handylab LF 12
18 ba75367e04 01/2011
4.2 Measuring
4.2.1 General information
Preparatory
activities
Perform the following preparatory activities when you want to measure:
Caution
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232 inter-
face is not galvanically isolated.
Temperature
sensor
Only carry out measurements with a temperature sensor. The temperature
sensor is shown on the display by TP.
Note
The conductivity measuring instrument automatically recognizes the type of
the temperature sensor used. This enables to connect measuring cells with
the NTC30 or Pt1000.
Temperature
compensation
The instrument has a nonlinear temperature compensation that can be
switched off (see section 4.3.3 S
ETTING THE TEMPERATURE COMPENSATION
TC).
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 section 4.6 C
ONFIGURATION .
1 Connect the conductivity measuring cell to the measuring in-
strument.
2 In conjunction with the measuring cell, check or calibrate the
measuring instument. How to calibrate is described in section
4.3.
3 Select the measuring mode with <M>.