Commissioning / Connection; Water Connections; Electrical Connections; Preparation Of The Measuring System - Grundfos Conex DIA-1-A PA/HP Montage- Und Betriebsanleitung

10. Commissioning / connection

10.1 Water connections

Fig. 4 Water connections
• Connect the sample-water supply line (tube 6/8).
Connect the flexible pressure tubing exactly!
Air bubbles in front of the diaphragm impede the
Caution
passing through of the disinfectant (peracetic acid or
peroxide). This can result in incorrect measuring
signals!
• Connect the flexible pressure tubing!
• Connect the sample-water discharge line, and route the
discharge line downwards to avoid siphon effect.
The measuring cell may be run at a constant
Note
pressure up to about 1 bar.

10.2 Electrical connections

For electrical connections, see the installation and operating
®
instructions for the Conex DIA-1 / Conex
Warning
Switch off the power supply before connecting the
power supply cable and relay contacts!
Observe the local safety regulations!
Observe the instructions for electrical connections in
the installation and operating instructions for the
®
Conex DIA-1 /
®
Conex DIA-2Q!

10.3 Preparation of the measuring system

See section
At delivery of the measuring cell, the diaphragm is dry. It must be
filled before starting up.
1. Prepare the flow armature:
2. Insert the measuring cell in the flow armature:
®
DIA-2Q!
11. Operation.
See also section 13.2 Maintenance of the measuring
cell for detailed instructions! There is a risk of
Caution
incorrect measurements if the device is not
maintained correctly!
– Insert the black O-ring in the 1" opening of the flow
armature, and after that insert the PVC support/sliding ring.
– Loosely screw the hollow PVC plug with the 1" thread into
the flow armature.
– Ensure that the inserted measuring cell is sufficiently
covered by the sample water so that the diaphragm cup is
immersed in water.
– Tip: The upper part of the measuring cell should project by
about 20 mm from the opening of the flow armature.
– Fix the measuring cell with the PVC plug in place.
1
2
3
Fig. 5 Preparation of the measuring system
Pos. Description
1 PVC plug
2 Flow armature
3 Measuring cell
Warning
A sudden breakdown of the measuring cell can lead
to an overdosing of disinfection agent!
Take appropriate precautions!
~ 20 mm
~ 20 mm
11