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The requirements for instrumentation in contact with potable water are changing. Wika complies with it.
Pressure measurement is usual when talking about water distribution networks. In addition to constant water quality, they must, in particular, provide adequate pressure in the supply network.
Depending on the topography of the supply area, the pressure sometimes needs to be decreased and frequently increased. An important task in this regard is also to ensure constant pressure via compensatory measures during peak periods of use and also during periods of low consumption. For this, pressure transmitters or manometers are mounted at the valves at different points of the network. By the signal from the pressure measuring instrument, the speed of the appropriate water pump can be set so that the supply rate exactly matches the requirement.
For applications on drinking water, ACS (Attestation de Conformité Sanitaire) was regularly requested until now. This document is no longer required.
Five European countries, including France, have agreed to unify the requirements for the use of measuring instruments, in particular for pressure and temperature on drinking water. These new arrangements also concern the accessories associated with the instruments, the first of which are valves and manifolds for measuring pressure.
To formalize these new provisions, there are directives (NSF / ANSI 372; NSF / ANSI / CAN 61) but also an official list of metallic materials called “4MS Common Composition List” (Common Approach; Part B; directive 98/83 / EC) whose compatibility with drinking water has been proven. Measuring instruments and their associated accessories conforming to these official requirements are therefore perfectly suited and accepted for applications on potable water.
In the Wika range, if we consider for example process-oriented products, stainless steel manometers type 232.50 and 232.30 as well as 1-way valves (IV1x range) and 2, 3 and 5-way manifolds (respectively IV2x, IV3x and IV5x) benefit from these new provisions.
Wika provides its customers, on its website, with official self-certification documents attesting to this compliance for its pressure gauges, thermometers as well as its valves, manifolds and monoflanges.
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www.wika.fr
