Smell bell units for odour monitoring and water quality
Your essential solution for reliable odour monitoring
When it comes to odour monitoring, guesswork isn’t enough.
Smell bell units, or smell bells, provide accurate, repeatable sensory testing to help you detect odour issues early, protect water quality and stay complaints with regulatory standards.
They are widely used by water companies, food and beverage manufacturers, bottling plants and industrial sites to identify taste and odour problems before they escalate.
Smell bell units help you meet odour monitoring requirements effortlessly, reducing the risk of fines, customer complaints, reputational damage and failed audits.
What is a smell bell?
In simple terms, a smell bell unit is primarily used in the water treatment process to conduct sensory tests on water quality.
The process involves heating a sample of water before spraying it inside of a bell jar to concentrate any potential odours for assessment by trained personnel.
Whilst it’s simple in design, it’s a tried and tested method which helps operators detect taste and odour issues – which might be intermittent or at very low concentrations, that a taste panel in a standard lab setting might miss.
Odours can be an early indicator of problems in a water source, including decaying organic matter, changes in source water quality, operational issues in treatment processes or chemical contamination – even if such contaminants are not immediately harmful to health.
Using a smell bell for this kind of sensory assessment is often a screening step before more detailed laboratory analysis is performed.
Primarily used by water companies, smell bell units can be useful for other industries, such as food manufacturers, bottling plants and chemical plants, for odour monitoring and detection.
The benefits of smell bell units
Prevent complaints before they happen
Early detection of odour issues helps you act quickly, maintain customer confidence and avoid negative feedback.
Protect health and safety
Uncontrolled odours aren’t just unpleasant – they can signal gases, including some that could potentially be harmful. Smell bell units provide early warnings to keep your team, your customers and the environment safe.
Safeguard your reputation
Show customers, regulators and other stakeholders that you take your responsibilities seriously.
Support regulatory compliance
Smell bells help water companies meet their Outcome Delivery Incentives (ODIs) and help other industries comply with environmental obligations.
Simple installation and operation
Our smell bell units are supplied as a packaged plant with straightforward plug and play set up.
Trusted to deliver safe, efficient solutions
Over two decades of proven experience
Established in 2004, IWS M&E has continually expanded its capabilities and reputation over the last 20 years. As specialists in mechanical and electrical engineering, covering water and wastewater asset delivery, project management and design, we support every stage of the water cycle. Our services are cost‑effective, technically robust and tailored to meet each client’s unique requirements.
Accredited with the standards that matter
Partnering with IWS M&E means working with a fully accredited and compliant organisation. Our team operates to the highest industry standards, ensuring every project is delivered safely, efficiently and to an exceptional quality. Explore our accreditations to learn more about our commitment to best practice.
Recognised for innovation and operational efficiency
Our commitment to delivering efficient engineering solutions has earned widespread recognition across the industry. Collaborative projects with partners including Wilo UK and Anglian Water have been acknowledged at multiple awards ceremonies for their success in reducing carbon emissions and improving operational performance. These achievements highlight our ability to deliver innovative, measurable results that make a meaningful impact.
Strengthened by South Staffordshire Plc Group
As part of South Staffordshire Plc’s critical and asset management services division, IWS M&E is guided by the Group’s core values: professionalism, trust, impact and the strength of a diverse, collaborative community. This foundation enables us to deliver reliable, proactive solutions for clients across the sector.
Smell bell units | FAQs
You can use a smell bell unit with either water from its raw source, or with treated water. You can have multiple units so they can be installed at your chosen water source.
Yes – each unit requires a 32Amp feed/socket suitable for a commando plug.
Yes – smell bell units are packaged plant and installation is a simple ‘plug and play’ concept. We also offer an installation service, if this is required.