
A-96.250.671 / 070222
AMI Silica
Product Description
12
Alarm relay
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.
Input
For potential-free contact to freeze the measuring value or to inter
-
rupt control in automated installations (hold function or remote-off).
Safety
features
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.
Communica
-
tion interface
(optional)
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
Fluidics
The sample flows via the sample inlet [R] and the flow regulating
valve [Q] into the constant head [A]. Adjust the flow regulating valve
so that always a small part of the sample flows through the overflow
tube [B] into the waste [I]. This adjustment ensures a sufficient sam
-
ple flow through the measuring chamber of the photometer [F].
If no measurement takes place, the sample flows through the pho
-
tometer outlet [E] where it will be aerated through air inlet [S] to gen
-
erate bubbles. Then the sample flows through the bubble counter [H]
into the waste [I].
If a measurement cycle starts, the solenoid valve [C] is activated and
the sample inlet [D] to the photometer is closed. The 6-way valve [N]
is automatically rotated to position 1 and a precisely defined quantity
reagent of the container [J] is pumped into the measuring chamber
by the peristaltic pump [O]. Immediately after that the 6
-
way valve is
rotated in position 2 and the reagent 2 from container [K] is pumped
into the photometer and mixed with the reagent 1 and the sample by
the magnetic stirrer [G]. This procedure is repeated with the 6-way
valve in position 3 and reagent 3 [L] and 6-way valve in position 4
and reagent 4 [M].
After the measurement has been finished, the solenoid valve opens
and the measuring chamber is flushed.
Position 6 of the 6-way valve is not used.