PERI InSite Construction -
Data Acquisition System
Instructions for Installation and Use - Technical Cabinet with Main Unit and Nodes – Preliminary Draft –
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3.3 System Overview
The PERI InSite Construction Data Acquisition System (“the System”) consists of
thermocouple (N-TE) and ambient climate or pressure (N-TRF) nodes paired with the Main
Unit L-11 permanently mounted in the Technical Cabinet.
The Technical Cabinet protects the Main Unit and serves as a charging station for the Nodes
when they are not in operation of collecting data.
When the System is in operation, the Nodes collect data such as temperature measured with
a connected thermocouple and transmits this data on pre-set time intervals to the Main Unit
using a proprietary encrypted protocol over the 868 MHz radio frequency band.
Data from the Nodes along with a record of the measurement time (timestamp) are temporarily
stored on the Main Unit for further forwarding to the Internet on set time intervals.
Once transferred to the Web Portal on the Internet the measured data can be accessed and
further processed using the Web Portal by the user.
Nodes can be configured as repeaters, in effect increasing the radio transmission range
significantly. The repeater functionality can be turned on from the Web Portal. When in
repeater mode, the Nodes draw more current from the battery, but the maximum radio range
of the System is increased substantially.
Figure 1 depicts a typical system setup with Node 01 being of the type N-TRF measuring the
ambient climate (temperature and air humidity) and five Nodes (02 – 06) of the type N-TE
measuring temperature (e.g. in concrete) in two points each using connected thermocouples.
Note that node number 06 is configured as a repeater extending the range for nodes in the
vicinity. The Main Unit L-11 inside the Technical Cabinet acts as a gateway linking the
connected nodes to the Internet based cloud services (the Web Portal).
Figure 1 - Overview of a typical setup