5. April 2026

The BuiltAir: Accurate Temperature and RH?

Consultants often require the flexibility of performing a single days test while being present or a more long term observation of a zone or building. The BuiltAir from Nosmotech as supplied by Air1Testing allows consultants to do both.

Nosmotech designed a robust and accurate multi parameter monitor. Our focus wasnt just to chose the most accurate sensors avaialble, but to:

A, validate the sensors against external reference.

B, configured as a single Standalone offline unit or multiple remote wifi monitors synchronised to monitor a space or zone.

C as an intalled multi unit system connected via ethernet or in-house wifi .

The Sensors

lets take an overview of the type of sensors used in most low cost indoor air monitors. Starting with temperature and humidity sensors.

The Bosch BME280

This is a general alround sensor with an accuracy of around +/- 1.0 degree centigrade making it a useful low sensor for general purpose monitoring. The sensor is generally used in products such as Air Gradient, Air Things, Purpl;e Air

The Sensirion SHT45

The BuiltAir uses the SHT45. The BuiltAir is focussed on high accuracy, near reference monitoring. The sensor has an accuracy of +/- 0.1 degree centrigrade. In all cases the BuiltAir is careful to monitor for an causation of internal heating, which may occur within other products.

Relative Humidity sensor( included in theSHT45). The accuracy of the SHT45 is +/- 1% as compared with 3% with the BME280. Both have their respective applications. But it is important to note that when you are relying on a measurement for system control accuracy is important and you will pay extra for that.

Why do we use it? The software designed to be used with BuiltAir allows integration via an application program interface (API). What can we integrate with? ventilation control systems, and general HVAC systems.