wtw Multi 350i, Operating Manual

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Multi 350i Operation
25
4.4 pH value / ORP voltage
4.4.1 General information
You can measure the following variables:
!
pH value [ ]
!
ORP [mV]
Caution
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as incorrect values would result. The
RS232 interface is not galvanically isolated.
Temperature
measurement
For reproducible pH measurements, it is essential to measure the tem-
perature of the test sample.
You have the following possibilities of measuring the temperature:
!
Automatic measurement of the temperature by the temperature sen-
sor (NTC30 or Pt1000) integrated in electrode.
!
Measurement of the temperature by the integrated temperature sen-
sor of a simultaneously connected DO sensor or conductivity mea-
suring cell in the test sample.
!
Manual determination and input of the temperature.
The measuring instrument recognizes whether a suitable sensor is
connected and automatically switches on the temperature measure-
ment.