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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual
UNIT SPECIFICATIONS
This section details the specifications for each unit.
Transmitter Unit
Input/output Number
Additional information
Digital Inputs 2 Dry-contact digital inputs slow-pulsed at 10Hz.
All inputs are suitable for voltage free contacts (e.g. mechanical switches) or
NPN transistor devices (e.g. electronic proximity switches).
NOTE: PNP transistor device inputs are NOT suitable.
Status Outputs 2 Separate System OK and Setpoint Status
Analog Inputs 1 0-20mA differential input; 16-bit resolution, 0.1% accuracy, 10 ohm input impedance.
Thermocouple Inputs 1 J, K or T Type thermocouple with on-board cold-junction compensation.
Cold junction compensation accuracy ±1º over ambient temp range: -40º to +70ºC.
Power Supply 1 9-30Vdc 0.6 Amp CSA certified Class 2 power supply. For use in Class I Div 2 hazardous
locations, the power supply must be approved for Class 1 Div 2 use.
WARNING: Explosion hazard - do not disconnect while circuit is live unless area is
known to be non-hazardous.
Transmitter 1 1-Watt Frequency Hopping Spread Spectrum (FHSS) Transmitter.
Frequency 902-928 MHz Actual frequency range depends on country.
Receiver Unit
Input/output Number Additional information
Digital outputs 3 Voltage-free contacts rated at 250Vac, 1A, 30Vdc 1A 2 for digital inputs and 1 for setpoint.
Status outputs 2 Separate System OK and communication failure output.
Analog output 1 16-bit resolution, 0.1% accuracy, single-ended source output.
Power supply 1 9-30Vdc 0.25 Amp CSA certified Class 2 power supply. For use in Class I Div 2 Hazardous
locations, the power supply must be approved for Class 1 Div 2 use.
WARNING: Explosion hazard - do not disconnect while circuit is live unless area is
known to be non-hazardous.
Radio receiver 1 High sensitivity FHSS UHF radio receiver.
Frequency 902-928 MHz Actual frequency range depends on country.
Sensitivity -110 dBm At PER 8%.
3A1580Rev1.6