Bi-Directional Acquisition & Control sensoRAD DR9031-02
Bi-Directional Acquisition & Control
The DR9031 is a 2-way wireless transceiver set which will send 1 or 2 analog channels and 4 digital switch status channels in both directions.
The transmitter input will accept both analog and switch contact inputs. The switch inputs require a standard contact closure or an open collector NPN transistor.
Dual channel DC voltage or current inputs are available. Each channel may be different.
Single channel RTD and Bridge inputs are available. The RTD input accepts 100 ohm platinum, 2 or 3 wire sensors. The Bridge input provides a precision 10VDC excitation supply that will drive four 330 ohm bridges in parallel to provide an average output from the 4 sensors.
The DR9031 provides isolation between analog inputs and power source. The DC Inputs are individually isolated. This isolation makes the product useful for measuring input signals with high common mode voltages and for breaking ground connections to eliminate ground loops.
RTD and Bridge sensors are inherently isolated, therefore the input circuits are only isolated from the power source.
A 12 bit A/D converter is used to digitize the analog data. Analog data and switch status is then transmitted to the companion DR9031 Receiver where the analog signal and switch status is reconstructed.
Dual channel input analog data is reconstructed as dual 4/20mA outputs. Single channel analog inputs are reconstructed as two 4/20mA outputs proportional to the input.
Switch status output is 4 optically isolated NPN transistors.
Three radio modules are available for the DR9031, 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 Transmitter PC board is used to set the Hop sequence.
With proper antenna and cable selection and a 915MHz band version radio, the DR9031 can transmit up to 20 miles. The 2.4GHz band version can transmit up to 10 miles.
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.