Wireless Round-the-Clock Observation of Coal Stacks, No Matter where Measurement Points May Move


One important risk to manage with regard to coal stacks is preventing fires due to spontaneous combustion. Generally, coal stacks are located in expansive areas where the wind blows unobstructed, posing a constant risk of spontaneous combustion. Even the best contingency plans by independent fire-fighting teams are unable to address the cause of the problem. And once fires start, if they aren't extinguished quickly they can spread rapidly and result in overwhelming damage to the company. Many companies set up regular patrols by engineers as a fire prevention measure. However, measuring coal stack temperatures can be dangerous, and it takes a lot of time and effort to cover the extensive areas involved. By using Yokogawa Electric's "Plant-wide field wireless," you can safely acquire temperature data any time from any point in a vast coal stack as a fire prevention solution.

What is Plant-Wide Field Wireless?

Plant-Wide Field Wireless is a wireless system that employs the international ISA100 Wireless (IEC62734) industrial standard, giving it the reliability demanded of industrial wireless communication and real-time functionality. It utilizes a redundant "Duocast" technology that communicates with two Access Points simultaneously to maintain connection when a communication channel or Access Point fails. It is highly scalable, supports a variety of interfaces for connecting to the Access Points and upstream systems including Ethernet, wireless LAN, and optical Ethernet, and is flexible during structural changes, making it ideal for building large scale wireless networks.

Customer Benefits

  • Covers up to 500 Locations from up to 2 km
  • Safe and Efficient Monitoring at a Lower Cost
  • Low Entry Cost, and Delivery in as short as One Day

Solution and Benefits

Covers up to 500 Locations from up to 2 km

Portable thermocouples of approximately 2 m in length are embedded at measuring points on the coal mounds where ignition is most likely to occur. By connecting these to YTA510 Wireless Temperature Transmitters, temperature data from 2 meters in depth can be transmitted wirelessly. Because it's a wireless system, it easily conforms to changes in the shape of the coal stack. It has a maximum range of 500 m, and covers up to 500 measuring points. By installing repeaters, you can monitor from a control room that is up to 2 km away. This scale of regular fixed-point observation would not be realistic with wired solutions.

Safe and Efficient Monitoring at a Lower Cost

Unmanned operation means that engineers are freed up from dangerous coal stack temperature measurement work. Further, the transmitters are battery powered (lasting up to 10 years depending on operating conditions), and require almost no maintenance. You can expect to lower your costs because you can reduce the time and labor involved in surveying immense coal stacks.

Low Entry Cost, and Delivery in as Short as One Day

Wired solutions require installation with cabling, which costs time and money. But wireless is relatively inexpensive because you simply install a device at each measurement and relay point. Installing the system can take as little as a day, saving even more time.

Coal stack temperature monitoring

YOKOGAWA Solutions Meet even More Needs

We carry a broad lineup of wireless field devices. For the YT510 Wireless Temperature Transmitter, in addition to the 2-input model, we also carry the YTMX580 Multi-Input Temperature Transmitter that accepts up to 8 inputs per unit. With Yokogawa Electric solutions, you can connect to a variety of upstream systems, from small- to large-scale.


  • Iron & Steel

    In the iron and steel industry, it is crucial to improve the quality of not only products but also manufacturing and operation technologies, as well as to address environmental and energy-efficiency issues. Yokogawa helps customers to create the ideal plant and evolves with them for mutual growth.

    See More

Related Products & Solutions

  • Touch Screen Paperless Recorder GX10/GX20

    The SMARTDAC+TM GX10/GX20 is a panel mount paperless recorder with a modular architecture on the back panel and has a data logging function to acquire the required data. By supporting not only I/O but also many communication protocols, you can connect to various devices. GX utilizes AI. Supporting FDA 21 CFR Part11 and AMS2750E/NADCAP.

    See More
  • YFGW410 Field Wireless Management Station

    YFGW410 Field Wireless Management Station has system manager/security manager/gateway function based on ISA100.11a, and combining this with Field Wireless Access Point(YFGW510) and/or Field Wireless Media Converter(YFGW610) composes the field wireless system.

    See More
  • YFGW510 Field Wireless Access Point

    YFGW510 Field Wireless Access Poin has backbone router function based on ISA, and combining this with Field Wireless Management Station (YFGW410) and/or Field Wireless Media Converter (YFGW610) composes the field wireless system.

    See More
  • YFGW520 Field Wireless Access Point

    YFGW520 Field Wireless Access Poin has backbone router function based on ISA, and combining this with Field Wireless Management Station (YFGW410) and/or Field Wireless Media Converter (YFGW610) composes the field wireless system.

    See More
  • YTA510 Wireless Temperature Transmitter

    The high performance temperature transmitter YTA510 accepts Thermocouple, RTD, ohms or DC mill volt inputs. The transmitters transmit not only process variables but also the setting parameters using wireless signal. The transmitters run on internal batteries, and the installation cost can be decreased since hard-wiring is not required. The communication is based on ISA100.11a protocol specifications. 

    See More
  • YTMX580 Multi-Input Temperature Transmitter

    YTMX580 can accept inputs from up to 8 points of measurement such as thermocouples (8 types: K, E, J, etc.) or RTD signals (3 types: Pt100, etc.), converting the corresponding measurement input values to a wireless signal. It can also accept DC voltage, resistance, and 4 to 20 mA DC signal input.

    See More
  • Field Wireless

    The flexibility of wireless solutions enables less investment in infrastructure while providing greater insights into plant operations.

    See More
  • Panel Mount Recorders

    Panel mount recorders are fully integrated data acquisition and display stations with secure, built-in data storage and network connectivity. Panel-mount solutions are NEMA compliant and integrate the data acquisition equipment into a control panel.

    See More