Data loggers can show baseflow, which is constant water use that is evident 24 hours a day. Baseflow should always be investigated to help you understand where your water is going.
In some cases like a manufacturing plant, which operates non-stop without regular shutdown periods, baseflow might not imply a leak. In these cases, data loggers can still identify issues when shutdowns for maintenance occur.
However, for most businesses, continuous water use overnight, particularly in the early hours of the morning represents an opportunity for investigation. Even in businesses like hotels that have people on site 24 hours a day, the water use should still return close to zero during this time.
By installing isolation valves into your plumbing network, you can isolate various areas of your site by turning water off to a specific area only. If the baseflow visible on the data logger then disappears or is reduced, it indicates that this is the area you should investigate further.
Not only does this save time for your plumber but you will save money too.