System Separation; Description Of Data Storage And Queries; Microbiological Examination Of Decentralized Disinfectant Metering Units - ECOLAB DG 3.1 Betriebsanleitung

6.2.7

System separation

The integrated system separation function (in accordance with DIN EN 171) reliable
prevents any disinfectant entering into the drinking water supply if low pressure occurs in
the water inlet line.
6.3

Description of Data Storage and Queries

Operating data and error messages are stored automatically. Basic settings, operating
data, and error messages can be queried if necessary (for example, for maintenance
purposes) using the display screen and can be saved on a standard USB memory stick.
The water and disinfectant consumption data can be added up for account settlement
purposes and can be saved on the memory stick per consumer.
6.4

Microbiological examination of decentralized disinfectant metering units

 Removal of the aerator at the swivel spout of the unit
 The outlet is to be disinfected on the outside with an alcoholic disinfectant
(Incidin Liquid, Incides N) or treated with a flame.
 After initially running about 1 l through, at least 1 l of disinfectant solution is to be
collected in a sterile container (attention: 1 l is the minimum tapping quantity,
also refer to the information on the unit).
 Neutralizing agents must only be added after the recommended contact time for the
relevant use concentration of disinfectant against bacteria and yeast has elapsed
(see product label).
 Appropriate neutralizers (chemical composition and concentration) can be selected and
validated according to EN 13727 or standard DGHM/VAH methodology or be enquired
about with the manufacturer.
 Neutralizing agent must be sterile.
 The sample has to be investigated in a microbiological laboratory by filtration for its
aerobic total microbial count. Ideally, this value is determined per 1 ml, per
10 ml and per 100 ml.
 Refrigerated transport (4 °C) in lightproof containers is desirable; this is mandatory in
the case of transportation > 3 hours.
 The sample should be processed 2 to 3 hours after tapping.
 In addition to the microbial count, the type of microbes discovered should also be taken
into consideration for the purposes of assessment. For example, the presence of
spores in non-sporocidal agents cannot be regarded as a quality defect.
417102242_DG_3 - 70 - Rev.: 02-05.2014