After 15 months of rigorous testing, temperature data logging company, Signatrol has confirmed that models in its SL60 product range are fully waterproof in long term water submersion.

The result means the products are suitable for measuring temperatures at various depths, enabling accurate prediction of the effects of groundwater infiltration and so helping to minimise the effects of sewage discharge.

Signatrol’s SL50 series of data loggers has been used extensively by water companies for several years to collect effluent temperature data which can then be incorporated into network models to predict flow behaviour and enable timely corrective actions. But its new SL60 product – which Signatrol considers a major improvement in accuracy and battery life over the SL50 series – needed to be tested to ensure it can withstand extended immersion in water and meet the needs of effluent data logging and, ultimately, helping to reduce the potential impact of pollution on the environment.

In tests, Signatrol’s SL63T data loggers were configured to record temperature data at 30-minute intervals and placed at a depth of 1.7 metres in water at room temperature. Each SL63T unit can record up to 9,500 readings with an accuracy of ±0.2 °C and has a typical battery life of two years.

The devices were recovered monthly and checked for data integrity. After 15 months of continuous immersion, all units were found to be fully functional, with only 50% of battery capacity used. Signatrol believes that the loggers will continue to operate effectively for many more months—far exceeding their published specifications.

Signatrol’s next generation SL60 data loggers work with the company’s TempIT5 software and offer several improvements on the SL50 including more readings with a wider range of accuracy and resolution, increased battery life and a competitive price.