Y-Flow®- Remote Terminal Unit (YRTU)

Yokogawa’s low power RTU offers flexible I/O points and superior data collection with a wide range of connectivity options. High reliability is an essential requirement in systems that control and acquire data from various devices and processes. More importantly, this system offers redundant communication capability for process critical applications to ensure your process is monitored around the clock. Whether you are measuring gas flow for custody transfer or need wellhead control and monitoring, Yokogawa offers both the performance and stability required in the most rigorous environment.

  • Solar panel with battery back-up or AC powered with battery back-up
  • Wide array of wireless connectivity options (Cellular, wireless radio and satellite)
  • Pole mount, wall mount or direct mount options
  • Wide variety of enclosure size options



Pre-configured Applications

AGA 3 Orifice Measurement Tube/Run Switching
AGA 5 Fuel Gas Calorific Measurement Turbine Meter Profiling
AGA 8 Gas Density Measurement (Detailed & Gross Methods I & II) Compliance Alarming
AGA-7 Measurement of Natural Gas by Turbine Meter Tank Level Monitoring
AGA-9 Measurement of Gas by Multi-Path Ultrasonic Meters (using AGA-7) V-Cone Measurement
AGA-11 Measurement of Natural Gas by Coriolis Meter (using AGA-7) Plunger Lift
NX-19 Gas Density Measurement --
Emergency Shutdown --
Valve Control --

Wellpad Monitoring & Control

Yokogawa’s Y-Flow® YRTU is an effective and precise remote management controller that allows for maximized production while ensuring the production process is safe and reliable. By taking inputs from various instrumentations, the YRTU will process and monitor the data through pre-programmed or user-designed applications. The data is logged, stored and transmitted to a host/SCADA system via Ethernet (Modbus Serial, Modbus TCP) or wireless communication protocols.

Gas Measurement

Yokogawa’s Y-Flow® YFFC provides timely, accurate and reliable measurements anywhere, anytime. By combining the Y-Flow® with Yokogawa’s state-of-the- art coriolis, vortex and multivariable meters, accurate gas measurements are easier than ever. From orifice flow to steam measurement, Yokogawa’s Y-Flow® YFFC provides superior accuracy and reliability that ultimately reduces CAPEX and increase profit.

Gas Control

In an industry where safety and reliability is priority, Yokogawa’s Y-Flow® provides the control and peace of mind for operators and engineers alike. From emergency shutdowns to valve control and positioning, Yokogawa’s Y-Flow® is there to ensure the process is safe and sound.

YRTU Technical Specification

Input Power Supply

  • Input Power: 12-30 VDC
  • One (1) power supply/rechargeable battery input with screw terminals
  • Integrated solar panel charger supporting up to 20W solar panel

Power Monitoring and Battery Backup

  • Supply voltage monitoring through A/D with low supply voltage alarm
  • 3.6 VDC lithium ion battery backup for database, history, audit trial, time/date and RAM
  • 20W on board battery charger, 90W maximum
  • 32AH solar panel battery (optional)


  • Processor: ARM Dual Core 32-bit
  • Flash Memory: 32 megabit
  • SRAM Memory: 32 megabit
  • A/D: 16-bit with optional HART filtering

Display Options

  • 4 line alphanumeric display with push button keypad

Operating Temperature

  • -40C to 70C (-40F to 160F)

Communications Options

  • Standard: Two (2) Serial RS-232/RS-485
  • One (1) Ethernet port, (1) USB Host Port, (1) USB Device Port
  • Wireless Communication: Cellular (CDMA/GSM), Radio (spread spectrum licensed & unlicensed frequency), Satellite (LEO &GEO)
  • Protocols: MODBUS TCP/IP, MODBUS Serial, ERC Hex ASCII (native)

Input and Output (I/O)

  • Analog Inputs: Four (4) universal analog inputs, 0-5VDC or 4-20mA (Requires 250 ohm resistor)
  • RTD Inputs: One (1) temperature probe
  • Digital Input/Output: Two (2) form A/C pulse input, Two (2) form C relays, Two (2) DI, Two (2) DO

Optional I/O Extender Board

  • Two (2) Serial RS-232/RS-485
  • Four (4) universal analog inputs
  • One (1) analog output
  • One (1) RTD temperature probe
  • Two (2) form A/C pulse input
  • Three (3) DI, Three (3) DO
  • Opto 22 G4 Voltage Signal Conditioner


  • UL Class I, Div II Group A,B,C,D (pending)


  • Field Manager


  • 4 years limited warranty


Y-Flow® Extender Board

In addition to the standard I/O offered on the processor board, the YFFC and YRTU have the capability to expand I/O count by adding the Y-Flow® extender board. Furthermore, the extender board allows for Opto 22 G4 AC and DC input/output modules for applications that require switching loads such as DC relays, solenoids, motor starters, lamps and indicators.

Type Count
Serial RS232/RS485 2
Analog Inputs 4
Analog Outputs 1
RTD (Temp Probe) 1
Pulse Inputs 2
Digital Inputs 3
Digital Outputs 3
Opto 2 G4 Slots 2




Looking for more information on our people, technology and solutions?

Contact Us