AMU pH-Redox
Product Description
A-96.250.441 / 060619
9
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.
Open (closed)* during normal operation, closed (open)* on error
and power loss (* as defined when ordering). Summary alarm indi-
cation for programmable alarm values and instrument faults.
Maximum load: 100 mA/50 V
Input
One input for potential-free contact to freeze the measuring value
or to interrupt control in automated installations (hold function or re-
mote off).
Communica-
tion Interface
RS232 interface for logger download with HyperTerminal
RS485 interface with Fieldbus protocol Modbus or Profibus DP
(optional)
Safety
Features
No data loss after power failure. All data is saved in non-volatile
memory. Over voltage protection of in- and outputs. Galvanic sepa-
ration of measuring inputs and signal outputs.
pH Electrode
For the AMU pH-Redox four types of pH electrodes are available.
The Swansensor pH Standard is a combined gel electrode for
application in drinking water and swimming pools. Gel electrodes
can not be filled again and have a limited life time.
The Swansensor pH SI is a combined electrode with liquid
electrolyte (KCl) for the measurement of pH in power plants.
The Swansensor pH AY is a combined gel electrode for
application in waste water due to additional salt supplies
The Swansensor pH FL for the measurement of pH in high purity
water. This sensor can only be used in combination with
Swansensor Reference FL, A-87.860.100.