PROCESS CONTROL RI-4 Radio Frequency (RF) Transmitter with Four Universal Inputs communicates point information to a Model RO-4 receiver. Each of the four input points may be configured for status contact, analog 0-20 mA, or 0-10 VDC input signals. The transmitter is tuned to 923 MHz and 50 mW for an open-air effective range of 2700' (823m). There is no RF tuning, no external RF antenna, and no specific radio experience required to install or use the system. The RF signal uses proven spread-spectrum technology.

Eliminates wiring Four universal input points Spread-spectrum technology No FCC license required 200' to 500' (61 to 152m) in-building range 2700' (823m) open-air range 923 MHz RF carrier No external antenna required 50 addresses per facility Made in USA  Extended range upon request Transmitter Diagram   -   Receiver Diagram Specifications Universal Input Supply Power 24 VAC/DC ±10% @ 100 mA Inputs (4) Selectable digital or analog   Digital Dry contact or transistor switch   Analog 0-20 mA, 0-10 VDC Impedance 250ohm  (mA), 20 kohm (VDC A/D resolution 12-bit converter Ambient temp 14° to 140° F (-10° to 60° C) Ambient RH 5% to 95% RH noncondensing Connection Terminals screws Housing NEMA 4, plenum rated Weight 1.2 lb (.56 kg) Dimensions 5.11"W x 5.11"H x 2.95"D (12.9 x 1.9 x 7.5 cm) Aux power out 20 VDC @ 100 mA for loop power Radio Frequency 923.58 MHz Transmitter power 50 mW Transmission  interval 0.5 sec to 30 min. (factory set to 30 sec) Transmission time 16.6 msec Antenna Built into circuit board Modulation Direct sequence, spread spectrum Data rate 19.2 KBPS Approvals FCC CFR part 15.247 Address Structure Facility code Unique for each system Transmitter address 50 addresses per system @ 30 sec intervals Point ID 1 through 4 4Ch analog/digital Rx      Power Supply