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Operation
Preparatory
activities
Temperature
sensor
Temperature
compensation
Reference
temperature, Tref
14
4.2
Measuring
4.2.1 General information
Perform the following preparatory activities when you want to measure:
1
Connect the conductivity measuring cell to the measuring instrument.
2
In conjunction with the measuring cell, check or calibrate the measur-
ing instument. How to calibrate is described in section 4.3.
3
Select the measuring mode with <M>.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS 232 inter-
face is not galvanically isolated.
Only carry out measurements with a temperature sensor. The temperature
sensor is shown on the display by TP.
The WTW TetraCon 325 conductivity measuring cell has a temperature sen-
sor integrated in it.
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.
The instrument has a nonlinear temperature compensation that can be
switched off (see section 4.3.3 S
TC).
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
ETTING THE TEMPERATURE COMPENSATION
.
ONFIGURATION
Cond 3300i/3400i
ba75684e02
03/2008
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