Electrical Circuit - aqua metro CONTOIL VZE 15 Instructions De Montage Et Mode D'emploi

1.3
Shut off devices
In order to avoid backflows and drainings, shut off devices have to be mounted after the meter.
Backflows and drainings cause measuring errors and can damage the meter.
1.4
Impurities in plant or liquid
Should impurities occur in the plant or in the liquid, a strainer (dirt trap) has to be installed before the meter.
The filter mounted in the meter inlet is only a safety filter and is too small to act as a strainer.
1.5
Filling, dosing
For filling and dosing the valve has to be mounted between meter and discharge.
The shorter the pipe section between valve and discharge, the higher the accuracy. Fast opening and shutting of the valve should be
avoided (pressure hammer). Pressure hammers damage the meter.
1.6
Remote processing, ancillaries
Any backflow must be avoided on meters equipped with pulsers for remote processing.
If this cannot be achieved by appropriate plant design, a non-return valve should be fitted.
1.7

Electrical circuit

Electrical circuits and installations are subject to legal prescriptions which must be observed when planning the installations.
Electrical installations must only be executed by professional experts.
In the layout of the installation, the following factors should be taken into account during plant design:
• ancillary connected to or after the meter
• maximum cable lengths with/without amplifier
• connection boxes, cable guides
• environmental disturbances
Electrical installations are subject to special requirements.
Mounting and operating instructions CONTOIL
Maximum mesh width for strainers
Nominal Meter type
width VZE
DN15 0,250 mm
DN20 0,400 mm*
DN25 0,400 mm*
DN40 0,600 mm
DN50 0,600 mm
* Consider 2.4
®
VZO VZEA
0,250 mm 0,100 mm
0,400 mm* 0,100 mm
0,400 mm* 0,250 mm
0,600 mm 0,250 mm
0,600 mm 0,250 mm
VZOA
0,100 mm
0,100 mm
0,250 mm
0,250 mm
0,250 mm
15