• SCADALink SR900Wireless transmitter transmits a single 4-20mA signal and 2 Discrete signals to matching Sensor Radio Receiver at ranges up to 20+ Miles.


NOTE: This item is no longer for sale for new systems. Bentek will continue to support customers with existing SR900. Please go to our next generation replacement product, the RIO900.

SCADALink SR900 Sensor Radio: Wireless 4-20mA and Discrete Signal Transmitter/Receiver

The SCADALink SensorRadio SR900T/SR900R is a wireless Transmitter / Receiver System that allows license free transmission of a single 4-20mA signal and two discrete signals at up to 20+ miles. The SR900 are designed as wire replacements in applications where wiring is impractical or cost prohibitive.

SR900 Application Overview

Easy to Use

Sensor Radio’s come as a factory matched  set of TX/RX pairs.  No configuration is required.  SR900 feature 900 Mhz licensed free operation, no FCC/IC license required.

Secure Factory Set Codes

Secure factory set codes insure that that no other systems deployed will interfere with your system operation.   For customers that require a system with a single TX broadcasting to multiple RX can order additional receivers with matching secure codes.

Long Range

High Sensitivity and 1 Watt Transmitter Power at 900Mhz ensure long distance operation.

Fail-Safe Operation

Sensor Radio’s are designed with Fail Safe operation.  A Normal Open Link contact can be used  where the system is wired to, for fail safe operation.

Wireless I/O – Wire Replacement 

Wireless SensorRadio systems are an alternative to hardwired systems requiring conduit, cabling, and trenching.  Wireless systems are more immune to mechanical and water damage of hardwired systems.








Typical Application

The SensorRadio SR900 System is used in any industrial control where a small number of I/O needs to transmitted for:

  • Alarms
  • Measurement, Control, Shutdown
  • ESD
  • Gas Detection
  • Tank Level
  • Pressure
  • Flow
  • Temperature
  • Density

Point to Point Single Directional Telemetry

SR900 Typical Application

Point to Multi-point Broadcast (Multiple Receivers)

Sensor Radio’s can also be used in systems with a single Transmitter transmitting to multiple Receivers keyed to the same Transmitter. This allows the input at the Transmitter to be replicated at all the Receivers. Typical applications are in Pump Control and Shutdown Systems.

Pump On/Off Control:

SR900 Pump On or Off Control

Shutdown Systems:

SR900 Shutdown System










Features & Specs

  • License-Free 902-928 Mhz Frequency Hopping Spread Spectrum
  • One 4-20mA Input
  • 2 Discrete Inputs
  • 1-Watt TX power
  • Class 1 Div 2
  • Din Rail Mounted






1. SR900
ItemPart No.DescriptionNote
1ASR900 Sensor Radio Pair
Wireless Transmitter transmits a single 4-20mA signal and 2 Discrete signals to matching Sensor Radio Receiver at ranges up to 20+ Miles.
Master (Transmitter)
1BSR900T SensorRadio Transmitter
Spare or Replacement Transmitter
Slave (Receiver)
1CSR900R SensorRadio Receiver
Addition or Spare Receiver (must be keyed to Transmitter)
2. Omni Antenna Kit (Used with Master in Point to Multipoint Systems)
ItemPart No.DescriptionNote
2AOmni Antenna
Omni Antenna (N Female Connector) and Mounting Bracket
2BAntenna Cable35' LMR400 c/w N-Male ConnectorA
2CAntenna Lightning Arrester6GHz, N-F Connector , Bi-directional protection
2DAntenna JumperMCX to N-Male Jumper - 3'
3. YAGI Antenna Kit
ItemPart No.DescriptionNote
3AYAGI Antenna6dB YAGI Antenna c/w N-Female connector
3BAntenna Cable35' LMR400 c/w N-Male ConnectorA
3CAntenna Lightning Arrester6GHz, N-F Connector , Bi-directional protection
3DAntenna JumperN-Male to MCX Male 3'
4. Antenna Options
ItemPart No.DescriptionNote
4AANT-UHFUHF, 902-928 MHz, 3dBi, N (F) Connector.
4BANT-CELLAntenna Phantom, Omni, 4G/3G N(F), PMT, 698-960 MHz, 1700-2700 MHz, WHT.
5. Packaging Options
ItemPart No.DescriptionNote
5AAC Powered PackageAC Powered Package without battery backup.B
5BAC Powered Package with Battery BackupAC Powered Packages with battery backup.B
5CSolar Powered PackagesSolar Powered Packages with NEMA4 EnclosuresB


  1. Standard Cable Length – Order Longer Lengths as Required
  2. Packaged Systems Available – CSA Class I Div 2 or CSA General Certification

Connection Example

SR900 Wiring Connection Example





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