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Legionella monitoring increases accuracy and reduces costs

Published 16th March, 2010 by Neil Nixon

Legionella monitoring increases accuracy and reduces costs

AquaCare Water Hygiene Services has enhanced its water treatment portfolio with the addition of aquavision, an advanced remote Legionella monitoring system.

Water temperature measurements by wireless sensors are regularly transmitted to a web-based monitoring and management system, creating an automated paperless regime with increased logging accuracy and reduced manpower costs. Combined with AquaCare’s in-depth Legionella knowledge, aquavision enables clients to maintain ACoP L8 compliance with increased peace of mind.

Legionnaires Disease, a form of pneumonia that can affect anybody, is fatal in some 12% of reported cases. ACoP L8, the HSE’s Approved Code of Practice for the control of Legionella bacteria in water systems, calls for routine monitoring of water temperatures ‘at least weekly’ - and these records need to be kept for six years. In larger water systems, this monitoring can be a labour intensive task and subject to errors, leading to a loss of compliance. AquaCare’s new aquavision system eliminates both error and labour costs, providing a carbon- friendly alternative to paper-based reporting systems.

Three hardware elements make up aquavision: the aquaflush Legionella sensor, tempsense temperature sensor and RT:Wi5 data hub. Routine temperature measurements and weekly sentinel test results are collected locally and transmitted via radio or LAN to the Gnet24 web- based portal for analysis. Values outside ACoP L8 guidelines result in an immediate email or SMS to designated addresses for swift remedial action. Together, these elements create an integrated paperless monitoring and recording system across individual or multiple sites, with automated flushing and temperature testing in accordance with ACoP L8.

The aquaflush Legionella sensor automatically flushes water through every week to measure temperature data, which is then transmitted wirelessly to the data hub for relay to the server. Available in single or dual versions, this battery-powered unit is easily installed to new or existing sentinel outlets.

For cold-water tank, pipework, TMV and calorifier monitoring, the tempsense sensor records and transmits temperatures every 15 minutes to the data hub and on to the server. Available in single or dual versions - for co-located monitoring points - these battery-powered units are easily added to new or existing installations.

The RT:Wi5 data hub is the heart of the aquavision system, capable of managing hundreds of aquaflush or tempsense units. Data is collected locally over on-site radio and stored in its internal 2GB memory for onward transmission via GPRS short message service, Wi-Fi or Ethernet network to the Gnet24 portal. The data hub automatically senses surrounding sensors, making it quick and easy to install, with no field programming required. An on-board battery unit ensures no loss of data; a signal booster option is available to extend coverage.

Gnet24 is aquavision’s automated web-based user interface and reporting software, creating a paperless Legionella control system with no need for additional back-office software investment. Hourly updates from deployed sensors are analysed for temperature breaches and alarm alert generation. Online displays allow rapid drilling down to individual assets. Monthly reports can be distributed by email to designated addresses to facilitate forward planning of predictive maintenance. All breaches, temperature profiles and sentinel test results are stored for six years in a form suitable for HSE audits.

Aquavision was developed by Radio-Tech and is available for immediate deployment.

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