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 Open Collector NPN transistors. A DIP Switch on the PC board allows selection of Normal Acting or Reverse Acting (Failsafe) outputs.
Three radio modules are available for the DR9021, two 915MHz band versions with 7 Hop sequences each and a 2.4GHz band version with 7 Hop sequences. They use spread spectrum, frequency hopping technology. These choices provide 21 different Hop sequences that allow 21 systems to work in the same locale without interfering with each other.
A DIP Switch on the PC board is used to set the hopping sequence.
With proper antenna and cable selection and a 915MHz band version radio, the DR9021 can receive from a DR9011 up to 20 miles away.
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.
Wilkerson Instrument Co. 800-234-1343
