Swann AMI Phosphate-II Operator's Manual page 12

AMI Phosphate-II
Product Description
On-line
operation
Calibration
10
The sample flows through the sample inlet [K] and the filter vessel
[J] 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 drain [R]. This adjustment ensures a sufficient
sample flow through the measuring chamber of the photometer [M].
If no measurement takes place, the sample flows through the outlet
of the photometer where it will be aerated through air inlet [H] to
generate bubbles. Then the sample flows through the bubble coun-
ter [P] into the waste [Q].
If a measuring cycle starts:
1 A zero measurement with the sample is performed before the
reagents are added.
2 The peristaltic pump [C] pumps the reagents [N] and [O] into the
mixing chamber [G] where they are mixed together with the
sample and then flowing through the photometer [M].
3 The solenoid valve [I] 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.
5 After the 7 min have elapsed a second measurement is carried
out and the o-phosphate concentration is calculated.
6 If the measurement has been finished, the solenoid valve will be
deactivated to open the inlet of the photometer.
7 The sample flows through the outlet of the photometer where it
will be aerated to generate bubbles.
8 The sample flows through the bubble detector [P] and into the
waste [Q].
Close the flow regulating valve to drain the constant head. Prepare
a standard solution with deionized water and fill it into the constant
head. A normal measuring cycle is then initialized, the measured
value is used to calculate the photometer's slope. For details see
Calibration, S. 44.
A-96.250.641 / 290312