Requirements for instrumentation in contact with drinking water are changing. Wika complies.
Pressure measurement is a standard feature of water distribution networks. In addition to ensuring constant water quality, they must, in particular, provide adequate pressure in the supply network.
Depending on the topography of the supply area, pressure sometimes has to be reduced and frequently increased. An important task in this respect is also to ensure constant pressure via compensatory measures during periods of peak use and also during periods of low consumption. For this purpose, pressure transmitters or pressure gauges are fitted to valves at various points in the network. The signal from the pressure meter is used to adjust the speed of the appropriate water pump, so that the rate of supply corresponds exactly to requirements.
For drinking water applications, the ACS (Attestation de Conformité Sanitaire) was regularly required until now. This document is no longer required.
Five European countries, including France, have agreed to unify requirements for the use of pressure and temperature measuring instruments on drinking water. These new provisions also apply to the accessories associated with these instruments, first and foremost among which are valves and manifolds for pressure measurement.
To formalize these new provisions, there are guidelines (NSF/ANSI 372; NSF/ANSI/CAN 61) but also an official list of metallic materials known as the "4MS Common Composition List" (Common Approach; Part B; Directive 98/83/EC) whose compatibility with drinking water is proven. Measuring instruments and their associated accessories complying with these official requirements are therefore perfectly suitable and accepted for drinking water applications.
In the Wika range, for example, process-oriented products include 232.50 and 232.30 stainless steel pressure gauges, as well as 1-way valves (IV1x range) and 2-, 3- and 5-way manifolds (IV2x, IV3x and IV5x ranges respectively).
On its website, Wika provides its customers with official self-certification documents attesting to this conformity for its pressure gauges, thermometers, valves, manifolds and monoflanges.
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