wtw Multi 9420, Руководство по эксплуатации, Страница: 80 / 132

Conductivity Multi 9420
80
ba75964e04 04/2015
8.1.2 Measuring the temperature
For reproducible conductivity measurements, it is essential to measure the
temperature of the test sample.
IDS sensors measure the temperature with a temperature sensor integrated in
the IDS sensor.
8.2 Temperature compensation
The calculation of the temperature compensation is based on the preset refer-
ence temperature, 20 °C or 25 °C. It appears on the display as
Tr20 or Tr25 .
You can select one of the following temperature compensation methods:
 Nonlinear temperature compensation ( nLF ) according to ISO 7888
 Linear temperature compensation (lin) with adjustable coefficients of
0.000 ... 3.000 %
/
K
 No temperature compensation (off)
Application tips Select the following temperature compensations given in the table according to
the respective test sample:
The reference temperature and temperature compensation are set
in the menu for the parameter, conductivity (see section 9.5.1 S
ET
-
TINGS FOR
IDS
CONDUCTIVITY SENSORS
, page 92).
Test sample Temperature compensation Display
Natural water
(ground water, surface
water, drinking water) nLF
according to ISO 7888
nLF
Ultrapure water nLF
according to ISO 7888
nLF
Other aqueous solu-
tions lin Set linear
temperature coefficient
0.000 ... 10.000 %/K
lin
Salinity (seawater) Automatic nLF according to
IOT (International Oceano-
graphic Tables)
Sal , nLF