with GI.bench and 60 m cable length between DAQ Controller and DAQ Modules
Every time you need to measure analog or digital signals over a large distance in a power station, chemical plant or railway bridge, Gantner Instruments Q.series ensures shortest installation time and sensor cable length. The DAQ modules can be connected directly near the Q.station DAQ controller, but can also be distributed using a 2-wire shielded twisted pair cable for communication. Distributing the 10-30 VDC power supply is also possible within the same single cable. In that case a hybrid cable with one additional pair of wires is required for the supply voltage.
To reduce the voltage drop in the cable a local power supply can provides a solution. Using a local power supply is possible due to the DAQ modules’ galvanic isolation up to 500 VDC (channel to channel, channel to power supply, and channel to bus). This is a major advantage for measurement applications with several hundreds of meters of cable length, for example for monitoring long bridges and flyovers. Even if the local power supply sits at a slightly different potential than the power supply for the DAQ controller several hundred meters away, the 3-way galvanic isolation protects the complete system against voltage and current loops.
Our team at our headquarters in Schruns, Austria just finished a Factory Acceptance Test of a 600-channel multi-controller DAQ system for a power station monitoring application. The 600 channels will be distributed and daisy chained over different rooms and floor levels within the power station building.