Monitoring temperature and humidity conditions within cabinets has long been recognised as safer than relying on a single sensor for the room. Cabinet based sensors will give a quicker warning of localised rising temperatures and may prevent unnecessary equipment downtime, or even permanent damage.
Consistent positioning of the sensors within cabinets in datacentres is vital to being able to interpret the readings made, and the positions used should reflect the objective of the measurements.
Typically these objectives will include monitoring the quality of air entering the cabinet, as computer equipment manufactures will often base their acceptable operating conditions on incoming air temperature and humidity.
The ASHRAE (American Society of Heating, Refrigeration and Air-conditioning Engineers) recommends mounting a sensor at a fixed height at the front of cabinets, in line with equipment air-intakes.
This view is endorsed by independent data centre facility planning consultants.