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Operation
Preparatory activities
Temperature sensor
Temperature
compensation
Reference temperature,
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 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>.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS 232
interface is not galvanically isolated.
Only carry out measurements with a temperature sensor. The temper-
ature sensor is shown on the display by TP.
The WTW TetraCon 325 conductivity measuring cell has a temperature
sensor integrated in it.
Note
The conductivity measuring instrument automatically recognizes the
type of the temperature sensor used. This enables to connect measur-
ing 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).
TION
The reference temperature (Tref) can be switched between 20 °C and
Tref
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 COMPENSA
ONFIGURATION
Cond 3300i/3400i
-
.
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