Wireless Receiver sensoRAD DR9021
The DR9021 RF Receiver receives RF signals from the DR9011 Transmitter and reconstructs the analog signals as 4/20 mA outputs.
When the transmitter has a dual channel input, the DR9021 has a 4/20 mA output for each channel. If the transmitter has a single channel analog input, the DR9021 provides two 4/20 mA outputs proportional to the single input.
Switch outputs are provided as discrete optically isolated open collector NPN transistors. A DIP Switch on the PC board allows selection of Normal Acting or Reverse Acting (Failsafe) switch outputs. (see Figure 1)
The radio receives in the 902 to 928 MHz unlicensed ISM band. It uses frequency hopping, spread spectrum technology to allow multiple receivers to work in the same locale without interference. A DIP Switch on the PC board is used to set the hopping sequence.
With proper antenna and cable selection, the DR9021 can receive from a DR9011 up to 20 miles distance.
The DR9021 provides isolation between the output and the power source.
Screw terminal blocks that plug into the case allow easy wiring and removal of products.
All of the DR Series of products provide transient protection to help eliminate damage from lightning and from other transients created on the power and signal leads.
NOTE: This unit must be used with a DR9011 wireless transmitter.