Weidmuller CNDAR - Universal galvanically isolated signal converter - Handbuch (Seite 16)

16
en CND/AR
•Operation
General
The CND/AR measures conductivity using conductance cell and Pt100
for temperature compensation. It displays the conductivity at the
reference temperature, produces a proportional analogue current/
voltage output and has two alarm channels.
Cleaning
The case can be wiped with a damp cloth. De­energise the unit before
cleaning.
Conductance(Ω -1 ),Conductivity(Ω -1 cm -1 )andProbefactors
The conductance measurement is the inverse of the resistance
between the two probes. This depends on properties of the probe, like
the distance between them. The probe factor P
f
gives the relationship
between measured conductance M
c
and the actual conductivity
measurement C, so that
C = M
c
x P
f
CND/AR block diagram
Cell Conductance
Analogue Output
Alarm 1
Alarm 2
Power Supply
Cell Temperature
(RTD)