Product Introduction; Product Description; Intended Use; Functional Principle - Grundfos DID Montage- Und Betriebsanleitung

8. Product introduction

8.1 Product description

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Fig. 4 Components of DID with flow cell
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12 13
Fig. 5 Components of DID with immersed sensor
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6a
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6b
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Pos. Description
Water inlet, G 1/2 internal thread, connections for
1
Grundfos hoses
2 Ball valve, 1/4 NPT
Inlet strainer, with screw cap for removal and cleaning of
3
the sieve
4 Flow restrictor, mechanical
5 Flow detector, digital
6 Flow cell for 1 or 3 sensors
6a Sampling valve
6b Sampling point
Water outlet, G 1/2 internal thread, connections for
6c
Grundfos hoses
7 Sensors
8 CU 382 control unit
9 Opening for power supply and sensor cables
10 Screws for the terminal compartment
11 Latch of CU 382 cover
12 Cable gland for power supply
13 Connectors for s::can sensors
14 Cable gland for signal outputs
15 Holes for wall mounting
16 Sensor holder
17 Sensor guard
18 Backplate
19 Nameplate
20 Transparent hose for sample water

8.2 Intended use

The DID is designed for online monitoring of water quality
parameters and offers control functions for these parameters.
The DID must be used in accordance with the instructions given
in this manual. The values mentioned in this manual must be
observed.

8.3 Functional principle

The CU 382 control unit has a display and 7 operating buttons on
the front. The operating software starts automatically when the
CU 382 is powered-on.
The CU 382 control unit collects and displays readings from all
sensors via a digital bus connection. The CU 382 control unit
includes a PID (Proportional-Integral-Derivative) controller. With
the PID controller and dosing units, a closed control loop can be
set up.
The hydraulic part of the DID manages the complete water flow
from the inlet to the outlet. This includes filtration, pressure
reduction, flow restriction and flow control. The DID comprises
specifically designed flow cells for mounting of the sensors and
appropriate sampling.
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