Oil Heater Average Value Control


Oil heaters are used in the petrochemical and pharmaceutical industries to control the temperature of crude and reagent inside storage tanks and keep it within a certain range. Since the temperature of each point in the tank varies, you can avoid having to control the temperature of individual points by taking the average temperature and using the result as a control input value. With conventional controllers it was necessary to install several external computing units, but with the SMARTDAC+ measuring and control station the averaging is performed with an internal computing function, and the result can be input for controlling temperature.

Process outline

  • Input from multiple temperature sensors installed inside of the tank
  • Calculate averaged temperature value from six varying points
  • Carries out temperature control by using the average as a control input value

Oil Heater Average Value Control Process

Oil Heater Average Value Control Process

Customer Needs

  • Local controller that provides reliable, 24-hour, 365-day continuous operation
  • Calculate the average temperature from six varying points
  • Control temperature by using the results of averaging as control input values
  • Less programming solution
  • Record steam pressure, flow, and other phenomena for total system monitoring


Yokogawa's Solution

GX20, GX90UT
  • Take multiple temperature data from the oil heater with GX20 and GX90XA
  • Calculate average value from input values with MATH option (/MT)
  • Realize ideal temperature control of oil heater using average value as EXPV
  • Measurement, display and recording of multiple points of analogue  input are available with a single GX20 unit
  • Ethernet communication is available as  standard function.  It enables facilitates remote monitoring from control room


Customer Benefits

  • Simple user interface and less programming solution with mathematical option
  • High reliable recording and control unit including disconnected sensor detection
  • Integrate average calculation, control and recording function into one device
  • Saving space and cost for installing instruments


SMARTDAC+ Paperless Recorder / Data Logger

A broad range of data collection and control with excellent reliability and user-friendliness

Touch Screen GX10/GX20, GP10/GP20


  • Vertical panel mount
  • 12.1" TFT color LCD
  • Up to 100 channels (built-in), 450 channels (with expansion unit)
  • Maximum 1.2 GB internal memory
  • Up to 32 GB SD/SDHC card
  • Ethernet (built-in)

PID Control Module GX90UT


  • 2 loops per module
  • 2 analog inputs: universal input
  • 2 control outputs: current, voltage pulse
  • 8 Digital inputs, 8 Digital outputs (Open corrector)
  • Control interval: 100ms, 200ms
  • 4 alarm per loop


  • Base Chemical

    Yokogawa has been serving the bulk chemical market globally and is the recognized leader in this market. With products, solutions, and industry expertise, Yokogawa understands your market and production needs and will work with you to provide a reliable, and cost-effective solution through the lifecycle of your plant.

    See More
  • Chemical

    Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.

    See More
  • Petrochemical

    • Diverse needs of petrochemical companies’
    • Improve quality, productivity 
    • Yokogawa tailor-made solutions, long and wide-ranging experience in this field
    See More
  • Specialty & Fine Chemical

    Yokogawa has long served customers in the specialty and fine chemicals market. With a market leading batch solution that offers the best in class reliability and flexibility as well as industry experts who understand the complex requirements in designing a batch solution, you can be assured that in your partnership with Yokogawa you will have a system that will enable you to produce products that meet your customers’ needs in the future while maintaining safety and regulatory compliance.

    See More

Related Products & Solutions

  • Modular GM10

    For industrial and lab applications, the GM10 offers Bluetooth wireless connection and modular I/O that offers accurate and reliable measurements. The GM10 also supports 920 MHz band wireless communication.

    See More
  • Touch Screen GP10/GP20

    • SMARTDAC+TM GP10/GP20 Yokogawa Data Logger
    • Paperless recorder
    • Intuitive, human-centric design
    • Web-enabled functionality
    • Scalable architecture
    See More
  • Touch Screen GX10/GX20

    • SMARTDAC+ Touch Screen GX10/GX20
    • Multi-point touch screen recorder
    • Intuitive design
    • Web functionality
    • Scalable
    • GX20 supports 920 MHz band wireless 
    See More

Have Questions?

Contact a Yokogawa Expert to learn how we can help you solve your challenges.