AMU Rescon
Product Description
A-96.250.351 / 230320
7
2.
Product Description
2.1. Description of the System
This instrument is applicable for the determination of specific resis
-
tivity or specific conductivity in high purity water.
Measuring
Principle
The resistivity of high purity water is determined with a sensor con
-
sisting of two metal electrodes. The characteristics of each sensor
is expressed as cell constant. An alternating voltage (to minimize
polarization effects) is applied to two electrodes. Depending on the
concentration of ions in the sample, a signal results between the
electrodes which is proportional to the resistivity of the water.
The measuring result is indicated as resistivity or conductivity. The
conductivity measurement depends on temperature, as the mobility
of ions increase with rising temperature. To eliminate these effects,
the temperature is determined simultaneously with an incorporated
NT5K temperature sensor. Several temperature compensation
curves for different applications are available.
Signal
Outputs
Two signal outputs programmable for measured values (freely scal
-
able, linear, bilinear, log) or as continuous control output (control
parameters programmable).
Current loop:
0/4–20 mA
Maximal burden:
510 Ω
Relays
Two potential-free contacts programmable as limit switches for
measuring values, controllers or timer for system cleaning with au
-
tomatic hold function.
Maximum load: 100 mA/50 V
Alarm Relay
One potential free contact. Summary alarm indication for program
-
mable alarm values and Instrument faults.
Available in two configurations:
Normally open*: Closed during normal operation, open in case of
error or power loss.
Normally closed: Open during normal operation, closed in case
of error or power loss
*Standard configuration. To order the version with normally closed
alarm relay, contact your dealer in advance.
Maximum load: 100 mA / 50 V
