Supporting sustainability goals with accurate sensor calibration
Jason Webb, managing director, Electronic Temperature Instruments (ETI) A practical route to sustainability in buildings often starts with getting the basics right. Accurate sensor calibration helps close the gap between data and reality, improving energy efficiency, supporting compliance, and ensuring carbon reduction strategies are based on reliable information rather than flawed assumptions. Jason Webb, managing director, Electronic Temperature Instruments (ETI)
explores.
Although sustainability continues to drive lots of activity in the built environment, recent reports have highlighted a persistent disconnect between ambition and practical execution. The UK Green Building Council notes that progress is often limited by organisation-wide barriers such as fragmented decision-making, risk-averse cultures, and inefficient internal processes. Put simply, too many organisations are taking an unrealistic and impractical approach as they seek to reduce carbon emissions.
This challenge is particularly evident at an operational level within building services. While investment in technologies such as building management systems (BMS), AI-driven software and heat pumps continues to grow, budget constraints are increasingly shaping how organisations prioritise their sustainability efforts. As a result, there is a strong case for focusing first on optimising existing equipment and processes as a more practical and cost-effective starting point.
Improving sensor calibration is one such opportunity. While it won’t deliver net zero targets in isolation, a robust, long-term calibration plan can make a sizeable impact over time.
Understanding the ‘calibration gap’
Many operators fall at the first hurdle, letting the accuracy of sensors inevitably drift. Without regular recalibration or replacement, a ‘calibration gap’ emerges between the humidity and temperature data being reported and the actual conditions being measured. Decision-making becomes based on misaligned data, leading to misinterpretation, miscalculation and misspending.
This issue is common for several reasons, not least because many simply ‘set and forget’ their sensors, only reviewing performance when a fault becomes obvious. Even in more proactive environments, gradual drift can still go unnoticed. Assets often continue to operate without triggering alarms. In high-risk sectors like healthcare, hospitality and pharmaceutical, this means that critical legal thresholds may not be detected when they need to be.
Over time, these issues can significantly impact energy performance and undermine efforts to reduce emissions. Inaccurate humidity and temperature readings can cause HVAC systems to behave erratically. They may begin frequently switching between heating and cooling settings, placing an unrealistic demand on system performance that reduces efficiency and accelerates wear.
As a result, even well-planned carbon reduction strategies can start to unravel. If the data doesn’t reflect what it actually feels like in a space, occupants can quickly become uncomfortable and manually override carefully optimised settings. It also becomes much harder to track progress towards carbon reduction goals when the underlying data is unreliable.
Minimising the gap
It’s firstly essential to recognise that sensor calibration, while having no direct legal requirement in itself, underpins compliance with many critical frameworks and guidelines. This is most evident in high-risk industries but remains equally relevant in less critical spaces. In offices and residential buildings, for example, inaccurate calibration can still compromise compliance with important standards such as ISO 50001, BREEAM and LEED.
Calibration on an annual basis should then be considered a minimum requirement for most facilities, while more critical or regulated environments are likely to require a more frequent schedule. Where accuracy fails to improve following calibration, sensors may need to be replaced. In these cases, operators should consider upgrading to higher-accuracy digital sensors, particularly those with built-in self-diagnostic capabilities. These devices can automatically flag performance issues, alert users to potential drift, and in some cases compensate for minor deviations.
Finally, implementing a structured calibration strategy ensures that performance is consistently maintained over time. This should include a clear register of all sensors and their roles within building systems. Calibration intervals should then be defined based on risk and criticality, rather than adopting a one-size-fits-all approach. For example, sensors that directly influence HVAC control should be prioritised. Robust record-keeping is also essential for auditing and compliance purposes. Aligning calibration activity with recognised accreditation standards, such as the United Kingdom Accreditation Service, helps ensure that records remain credible and fully traceable.
Supporting sustainability goals
With improved sensor calibration and accuracy, organisations can enhance energy performance across their portfolios. Systems can be closely aligned with actual environmental conditions, reducing unnecessary strain on assets, extending lifecycles, and creating a reliable foundation of data for ongoing decision-making.
Over time, these improvements translate into much more than day-to-day emission reductions. More accurate data supports compliance with regulatory frameworks and strengthens progress towards long-term sustainability and net zero targets. Lower energy use and reduced maintenance requirements also deliver cost savings, freeing up budget for larger-scale initiatives such as BMS upgrades or low-carbon heating. Crucially, accurate data enables more confident planning, helping avoid over- or undersized asset investments.
Ultimately, by addressing the calibration gap, it’s possible to reduce energy consumption, improve system reliability, and ensure sustainability strategies are built on a foundation of accurate information. In the journey to net zero, calibration may not be the most visible solution – but it remains one of the simplest and most fundamental ways to begin aligning ambition with execution.
Rounding up
In summary, while the drive towards net zero often centres on large-scale technological investment, the role of accurate, reliable data should not be underestimated. Sensor calibration represents a relatively low-cost, high-impact measure that can significantly improve how buildings perform in practice. By addressing calibration drift and ensuring that environmental data reflects real conditions, organisations can avoid inefficiencies that quietly erode both energy performance and financial resources. More importantly, a structured and well-managed calibration strategy creates a solid foundation for all other sustainability initiatives, enabling systems to operate as intended and supporting more informed decision-making at every level. As regulatory pressures increase and performance standards tighten, the ability to demonstrate accuracy, traceability and compliance will become ever more important. In this context, calibration is not just a maintenance task, but a strategic enabler of long-term sustainability. Organisations that prioritise it now will be better positioned to meet their environmental targets, optimise operational performance, and unlock further efficiencies in the future.
Electronic Temperature Instruments