Design Of The Measuring Module; Functional Principle Of Measurement Module - Grundfos AQC-D6 Manual De Instalación

7.4 Design of the measuring module

2
1
3
10
6
5
9
Fig. 7 AQC-D6
Pos. Description
1 Extraction fitting (supplied by the customer)
2 Main water line (supplied by the customer)
3 Flow fitting / AQC-D6 measuring cell
4 Circulating pump
5 Taper seat check valve
6 Sample water removal
7 Feed fitting (supplied by the customer)
8 Sample water recirculation
9 Throttle valve
10 Isolating valves
7
10
4
ø 10.5
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7.5 Functional principle of measurement module

The measuring module is used to feed sample water to the
AQC-D6 measuring cell for determining the chlorine dioxide
concentration in potable water. Please refer to section
7.3 Function of the AQC-D6. Here the sample water is taken from
the main water line using a bypass and then fed back.
The sample water is taken from the main water line (pos. 2)
using a extraction fitting (pos. 1), from where it flows through the
bypass and a feed fitting (pos. 7) back into the main water line
(pos. 2). The spring-loaded taper seat check valve (pos. 5)
prevents the sample water from flowing back. The stream of
sample water can be blocked off using the isolating valves
(pos. 10). The circulating pump (pos. 4) drives the stream of
sample water through the bypass. It is designed specifically for
compensating the internal pressure drops. The extraction and
feed line must therefore be kept as short as possible.
Sample water is then taken from this bypass via the sample water
extraction (pos. 6), from where it flows through the flow fitting
(pos. 3) to the measuring cell and is then fed back to the bypass
through the sample water recirculation fitting (pos. 8). To do this,
the throttle valve (pos. 9) restricts the flow of water in the bypass
until enough sample water flows through the sample water
extraction section (pos. 6) to the flow fitting / AQC-D6 (pos. 3)
measuring cell.
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