Swann AMI Phosphate-II Operator's Manual page 11

AMI Phosphate-II
Product Description
Alarm Relay
Input
Safety
Features
Communica-
tion interface
(optional)
Cleaning
Module
On-line
operation
A-96.250.641 / 290121
One potential free contact. Alternatively:
 Open during normal operation, closed on error and loss of
power.
 Closed during normal operation, open on error and loss of
power.
Summary alarm indication for programmable alarm values and in-
strument faults.
One potential-free contact to freeze the measuring value or to inter-
rupt control in automated installations (hold function or remote-off).
No data loss after power failure. All data is saved in non-volatile
memory. Over voltage protection of in- and outputs.Galvanic separa-
tion of measuring inputs and signal outputs.
 USB Interface for logger download.
 Third signal output (can be used in parallel to the USB interface)
 RS485 with Fieldbus protocol Modbus or Profibus DP
 HART interface
An optional cleaning module is available that can be connected to
the AMI Phosphate-II.
The sample flows through the sample inlet [F] and the filter vessel
[G] into the constant head [A]. Adjust the flow regulating valve [D] so
that always a small part of the sample flows through the overflow
tube [B] into the constant head drain [H]. This adjustment ensures a
sufficient sample flow through the measuring chamber of the pho-
tometer [M].
If no measurement takes place, the sample flows through the outlet
of the photometer where it will be aerated through air inlet [P] to gen-
erate bubbles. Then the sample flows through the bubble counter [L]
into the photometer drain [I].
If a measuring cycle starts:
1 A zero measurement with the sample is performed before the re-
agents are added.
2 The peristaltic pump [O] pumps the reagents [J] and [K] into the
mixing chamber [E] where they are mixed together with the sam-
ple and then flowing through the photometer [M].
3 The solenoid valve [N] will be activated to close the inlet of the
photometer.
4 The sample remains in the photometer for 7 minutes. During this
time a reaction with the reagents takes place.
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