ELPRO 905U-K
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The 905U-K has an internal 900MHz frequency-hopping radio transmitter which operates on a license-free radio band. The 905U-K has an operating range of more than 20 miles (30km). It is suitable for monitoring in utility industries such as electricity, water and gas; and is also a cost effective solution for short range applications in factories and plants.
Mode of Operation
The 905U-K is compatible with the 905U range of wireless I/O products* - 905U units may be used to output the process signals, or act as a wireless interface connected to a PLC, DCS or PC. The 905U-K transmits the value of its input signals whenever the signal changes, or after a pre-configured update time. Each transmission message includes error-checking to confirm the validity of the message. The 905U-K can be configured to repeat the transmission several times to ensure that the transmission is received correctly. The input signal is output at a 905U unit either as an identical signal or across a serial data link (RS232 or RS485).
905U units may also be used as repeaters to extend the radio range of the 905U-K - up to five intermediate 905U modules may be used as repeaters in any radio path.
More than 10,000 905U-K units may operate together in a single system.
Extremely Low Power Consumption
The power consumption of the 905U-K is very low as it conserves power by reverting to ”sleep” mode between measurements of the input signals and transmissions.
The 905U-K can be powered from a 6 - 30 VDC supply. It can also be powered from one or more ELPRO BU-5 battery packs without any other power source. Each battery pack can power the 905U-K for over a year, depending on input signal configuration. The 905U-K unit provides an internal alarm on low supply voltage - this alarm can be transmitted by radio.