920 MHz Wireless Data Acquisition

Want to integrate your site data and embrace the IIoT?

The SMART 920 is a wireless recording solution for the SMARTDAC+ family of recorders and data loggers. With the SMART 920, a GX20, GP20 or a GM10 will become a completely self-contained industrial data acquisition system that supports data collection from both wired and wireless points.

When you need to add measurement points that cannot be easily reached, or when it becomes expensive or difficult to run wire to that point, a wireless solution is recommended.

Equipped with 920 MHz Mesh network technology, the SMART 920 has a longer range than one in the 2.4 GHz band typically used in wireless LAN applications. The 920 MHz wireless signal also gives it a greater reach around obstacles, making it favorable for long distance or highly obstructed environments.

>> Pharmaceutical warehouse temperature mapping and continuous monitoring  New

Note: The use of SMART 920 enabled units is limited to the United States, Korea and Japan. Please refer to the instruction for proper installation and use.


About OpreX

OpreX is the comprehensive brand for Yokogawa’s industrial automation (IA) and control business and stands for excellence in the related technology and solutions. It consists of categories and families under each category. This product belongs to the OpreX Data Acquisition family that is aligned under the OpreX Measurement category.


Flexible transmission of important data

Flexible wireless communication

  • Communication between the main unit and a SMART 920 remote unit can be established up to approximately 1 km in line of sight.
  • The intelligent mesh network automatically recognizes unstable wireless links and re-routes data to a clear channel.

Flexible wireless communication 1 Flexible wireless communication 2


High speed, high reliability, multi-channel communication

  • It is possible to communicate with 100 slave devices at 1 second update speeds.
  • We can support a wide range of applications from small single point to large multi-point applications.

    Modbus master commands: Up to 100
    Communication channels: Up to 500
    (large memory type)

High speed, high reliability, multi-channel communication


Notification by alarm when communication is disconnected

  • In the unlikely event that wireless communications is interrupted whereas data cannot be collected, the master unit will inform you by alarm.
Notification by alarm when communication is disconnected

Can be easily installed in locations without power

  • Since the GX70SM is a compact, battery-powered wireless input unit, it can be easily mounted and used in areas without power.
  • With the arrival of a portable master recorder, you can change layout even more flexibly.
  • Displays the GX70SM battery status on trends, numeric, bar graph, and other monitor screens.
Battery status display

Interpolation of data loss (when using GX70SM)  New

  • If all communication routes are down, the GX70SM continues to collect data. It is possible to restore the data stored in the GX70SM into the missing record of the GX20 / GP20 / GM10.
  • The module can retain 9000 points of logged data.
  • If the wireless connection is interrupted for any reason, the missing data can be restored from the GM70SMs memory.

* 30 days at a 5-minute scan interval

Supports for the pharmaceutical field realized by wireless

Pharmaceutical warehouse temperature mapping and continuous monitoring  New

The wireless input unit (GX70SM) provides a continuous temperature mapping and recording solution in product storage areas. Plus, it can continuously monitor risk points throughout the warehouse.

Pharmaceutical warehouse temperature mapping and continuous monitoring

Validation documents  NEW

  • Additional verification protocols are available for the GX70SM wireless module. They can be combined with the SMARTDAC+  validation document (sold separately). You can reduce validation man-hours by using the GX70SM validation document, 773230/W.

It enables visualization (graphing) of power usage in factories, creating reports, and other tasks, and helps you identify areas of wasted power.

Power monitoring package

Monitor integrated values of watt hours with hourly, weekly, and monthly reports.
You can also compare with past data.

Power monitoring package

Monitor equipment operating conditions on production lines and other locations with the SMARTDAC 920

You can monitor equipment operating conditions on production lines and other locations. By incorporating computation functions you can tabulate downtime, count system shutdowns, and manage other data, and you can monitor and manage conditions on the master side.

Monitor machine operating status


See data in areas without power (when using GX70SM)

Temperature and humidity management of clean room

The wireless input unit GX70SM has built-in humidity sensor. It can be used in areas with severe restrictions such as the clean rooms. Also, the inputs can be calibrated by the customer.

stable wireless communication

Improve working conditions in a factory

Because of its excellent responsiveness to aggressive temperature changes, we are able to control the temperature and humidity inside the factory. We can see environmental and safety conditions and to take measures against heat stroke of personnel.

operations improvement


Improves status and remote monitoring

Storage warehouse door state and temperature monitoring

Monitor the temperature of the warehouse and check whether the door is open right from the office. Customize your display for immediate grasp of conditions.

Storage warehouse door status & temperature monitoring

Remotely Monitor Operating Conditions

Clean room The ability to remotely monitor conditions in clean rooms is crucial in industries such as pharmaceutical/bio-tech or food and beverage.

  • No wiring needed
  • Easy to add instruments
  • Reduce the frequency of entering and exiting the clean room .... and other benefits 

Remote monitoring of operation conditions

Monitor and record the field data (temperature, flow and pH etc.) from the office building

Wirelessly connect to the temperature, flow, and pH values displayed on measurement panels distributed throughout the factory, and remotely monitor and record them.

Monitor and record panel display temperature, flow, and pH from the office building.

The SMART 920 lineup of 920 MHz equipped instrumentation can be selected and deployed based on the application and the installation environment

As a master station

As a master unit, the SMART 920 equipped units will collect and record wireless data from products equipped as slave devices.

GX20 paperless recorder GP20 paperless recorder GM10 data acquisition system
Panel Mount Recorder
Portable Data Acquisition
Modular Data Logger


As a mesh network relay

These devices will reliably route wireless data across the mesh network to the master station. These unit will perform as range extenders or as smart routers, directing wireless data to the next relay with the strongest connection.

GM10 data acquisition system UT52A-UT32A digital indicating controller
Modular Data Logger
Temperature Controller / Gateway


As a slave device

These devices collect process data that is wirelessly transmitted to the master station or repeater. Various mounting option are available. Along with simple point measurement, these units can provide a variety of I/O functions that can be monitored and controlled over the wireless network (PID control & ladder control). Remote devices that need to be monitored wirelessly but do not have wireless capabilities can be connected to the SMART 920 network by way of the Modbus gateway.

GX70SM wireless input unit GM10 data acquisition system UT52A/UT32A digital indicating controller
Wireless Input Unit
Modular Data Logger
Temperature Controller / Gateway



Yokogawa Electric began offering the environmental monitoring system "OpreX Environmental Monitoring System" (hereinafter, OpreX EMS) for the pharmaceutical and medical device industries in October 2020. OpreX EMS, which was launched simultaneously domestically and overseas, is based on customers' needs, such as regulatory compliance, diversification of operational risks, and high usability. When asking the person in charge about the development history and features of the product, it was found that it is a new solution that meets the company's business vision.

Yes, add suffix code /W (for 920 MHz wireless communication) to the GM90PS power supply module.
Approximately 1 km. We recommend confirming this in the site where it will be used.




YOKOGAWA creates autonomous operations with high-efficiency automation and optimization that allows growth with minimal deployment of manpower.


YOKOGAWA aspires to establish Smart GMP manufacturing facilities that provide consistent quality and supply while eliminating industrial waste, enhancing productivity and always using high-quality component parts and materials.

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