Flanged water meters / flow meters, DN40-400-
IP65/68
-CE – Operating Manual
Page 11 of 19
•
Volumetric flow value, Q
3
(m
3
/h);
•
Measurement unit designation, m
3
(see the counter scale);
•
Maximum pressure loss, Δp
;
•
For cold water meters: the maximum temperature limit, e.g. T50 (50°C),
•
For hot water meters: the maximum temperature limit, e.g. T130 (130°C);
•
Maximum pressure limit: MAP16 (PN 16).
7. Water meter installation requirements
7.1 The installation location should provide easy access for the process of installation, removal, servicing,
and reading, and be separated from rooms in use or for storage. The installation location should be sheltered
from the weather, including sub-zero temperatures, high humidity levels, dust, and the effects of electrical
power and gas systems. If there is no installation location suitable according to these criteria, the water
meter can be installed in a dedicated chamber, but the installation location inside it must be sufficiently high
above the chamber bottom. The chamber must have a sediment trap or a water drain discharging to the
outside.
7.2 The water meter must not be
exposed to shocks or vibration while installed due to nearby equipment or
to excessively high ambient air temperatures, contaminants, flooding with water, or corrosive agents. The
installation location temperature must be b5°C and +55°C. Protect the water meter from hydraulic
turbulence, including cavitation and water rams.
7.3 Provide stop valves upstream and downstream of the water meter connections to enable isolation from
the water for removal or repair of the water meter.
The stop valves must expose the entire water supply pipe
bore.
7.4 If the water flow is expected to be contaminated during operation of the water meter
,
install a suitable
filter or trap between a straight upstream section of the piping and the upstream stop valve.
7.5 To prevent the installation
fastening from stressing the water meter body, it is recommended to use
expansion (deflection) couplings installed on the meter’s discharge side. The coupling must permit the
reduction of the length by telescopic sliding of its sleeve.
7.6 The piping route geometry at the installation
location must prevent air blocks from forming within the
installation length of the water meter. The water meter must remain completely filled with water,
so the water
supply piping downstream of it must not have a
drop in the downstream direction (see Fig. 1)
.
Fig. 1. Installation of the water meter
Water meter
