Plant Design; Layout Of Piping; Layout Of Meter And Accessories; Shut Off Devices - aqua metro CONTOIL VZO 4 Instructions De Montage Et Mode D'emploi

Plant design

Layout of piping (Pict. 1 and 2, page 14)
Easy access for reading the meter and controlling the ancillary equipment is important. Mounting position of the meter (with or without pul-
ser):
• Do not mount the meter with the head pointing downwards.
• Adhere to the flow direction (arrow).
• Straight stabilisation pipes are not necessary.
• The layout of piping must ensure that the meter is at all times filled with liquid and that no inclusions of air or gas may occur.
The quantities consumed by all the users must be registered by the meter.

Layout of meter and accessories

Differential measurements or mounting the meter on the suction side demand special requirements for installation. Please find detailed in-
formation in the technical documentation CONTOIL
Select the meter and the ancillaries according to the max. working conditions.
• Operating pressure
• Operating temperature
• Ambient temperature -10 °C...60 °C
• Resistance of the material against
- liquid to be metered
- working conditions
• Flow rate
Flow meters are to be selected according to the flow rate and not according to the pipe diameter. If necessary, adapt the pipework.
Shut off devices (Pict. 3, page 14)
In order to avoid backflows and drainings, shutt off devices have to be mounted after the meter. Backflows and drainings cause measuring
errors and can damage the meter.

Impurities in plant or liquid

Filters should be fitted to prevent any damage caused by impurities in the liquid. The filter mounted in the meter inlet is unsuitable to act
as dirt filter.
Filling/ Dosing (Pict. 4, page 14)
For filling and dosing the valve has to be mounted between meter and discharge. The shorter the pipe section between meter and discharge,
the higher the accuracy. Fast opening and shutting of the valve should be avoided (pressure hammer).

Remote processing, ancillaries

Any backflow must be avoided on meters equipped with pulsers for remote processing. If this cannot be achieved by appropriate plant de-
sign, a non-return valve should be fitted.

Electrical circuit

Electrical circuits and installations are subject to legal prescriptions which must be observed when planning the installations. Electrical in-
stallations 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
6
® .
Maximum mesh width for strainers/dirt traps:
VZO DN 4 mm
VZO DN 8 mm
VZTH DN 8 mm
0,080 mm
0,100 mm
0,100 mm