Swann AMU-II ph/Redox Operator's Manual page 10

AMU-II pH/Redox
Product Description
Signal
outputs
Relays
Alarm relays
Input
Communica-
tion interface
Safety
features
pH electrode
8
Two signal outputs programmable for measured values (freely
scalable, linear, bilinear, log) or as continuous control output (control
parameters programmable).
Current loop:
Maximal burden:
Two potential-free contacts programmable as limit switches for
measured values, controllers or timer with automatic hold function.
Maximum load: 100 mA/50 V
Two potential-free contacts (one normally open and one normally
closed). Summary alarm indication for programmable alarm values
and instrument faults.
 Normally open contact: closed during normal operation, open on
error and power loss.
 Normally closed contact: open during normal operation, closed on
error and power loss
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 remote
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. Overvoltage protection of inputs and outputs. Galvanic sep-
aration of measuring inputs from signal outputs.
For the AMU-II 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
A-96.150.441 / 230523