Swann AMU pH-Redox Operator's Manual page 11

AMU pH-Redox
Product Description
Signal
Outputs
Relays
Alarm Relay
Input
Communica-
tion Interface
Safety
Features
pH Electrode
A-96.250.441 / 060619
Two signal outputs programmable for measured values (freely scal-
able, linear, bilinear, log) or as continuous control output (control
parameters programmable).
Current loop:
Maximal burden:
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
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
One input for potential-free contact to freeze the measuring value
or to interrupt control in automated installations (hold function or re-
mote off).
 RS232 interface for logger download with HyperTerminal
 RS485 interface with Fieldbus protocol Modbus or Profibus DP
(optional)
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.
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.
0/4–20 mA
510 Ω
9