Field Instruments

field instrumentation white paperField Instrumentation for Pressure, Temperature, and Flow Measurement

Yokogawa field instrument products includes a complete line of flowmeters, pressure transmitters, differential pressure transmitters, temperature transmitters, level transmitters, Fieldbus instruments and safety measurement instrumentation.

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  • The accurate and stable measurement of process pressure with Yokogawa Pressure Transmitters supports the safe, reliable, and profitable operation of your plant.

  • Yokogawa's range of flow meter instruments include vortex, magnetic, variable area, Coriolis, and differential pressure flow meters.

  • Yokogawa offers a full line of temperature transmitters that are head-mounted, panel-mounted, or field-mounted.

  • Yokogawa has more than 45 years' experience in the development, design, and manufacture of pressure sensors and pressure transmitters. The DPharp series of digital pressure transmitters use a differential pressure high accuracy resonance (DPharp) sensor that represents one of the most revolutionary advances in transmitter technology.

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

  • Yokogawa offers a variety of communication protocols; including, FOUNDATION Fieldbus, HART, BRAIN, ISA100, Profibus, and Modbus to help support smart devices in this evolving digital communication technology.

  • The new Yokogawa CA700 Portable Pressure Calibrator is equipped with a silicon resonant sensor that uses Yokogawa proprietary DPHARP technology. The CA700 can measure pressures with an accuracy that is within ±0.01% of rdg*, making it one of the most accurate portable pressure calibrators on the market.

  • Yokogawa offers a wide range of flow computers/totalizers, batch controllers and thermal energy calculators. Accepting signals from our vortex and magnetic flowmeters, the instruments are also suitable for use with other flow measurement technologies, including turbine, differential pressure, and target type flowmeters.

  • Remote Indicators can be a valuable addition to process measurements by providing local visual awareness of your process variables. Yokogawa offers several different Indicators for you needs.

  • Yokogawa has more than 40 years' experience in the development, design and manufacture of valve positioners and converters. They provide superior controllability and maintenance ability, which contributes to reduced plant operation costs.

  • Yokogawa’s DTSX solution ensures a safe work environment and total insight into the process being measured and provides a complete, simple and cost-effective solution to complex temperature measurements.

  • HART Converters consist of the Smart HART loop interfaces and monitors; as well as, HART concentrator systems and HART-to-MODBUS RTU.

  • Yokogawa Partner Products


Yokogawa provided an integrated and comprehensive solution for ethylene cracking process optimization.

SMOC APC controller improved control level of ethylene cracking unit and reduced operators workload.

  • Yokogawa provided control solutions for expansion project in sugar and bio-energy plant.
  • Consolidated central control room was designed for safe, comfortable, and efficient work environment.
  • A Japanese petrochemical plant leverages FDT/DTM-compliant intelligent field devices and Yokogawa's PRM asset management system for maintenance efficiency.
  • The customer aims to improve maintenance efficiency further by introducing condition-based maintenance (CBM).

SENAI-AL selected Yokogawa to provide the training solutions to learn the latest technologies as well as measurement and feedback control.

Yokogawa's STARDOM and transmitters are used for the micro ethanol distillation plant to develop future engineers.


Your field devices and actuators want to tell you more of what is happening in the plant, all you have to do is listen.


As digital and multi-functional field devices are increasingly used in the process industry today, users have access to large amounts of information available from such devices.


When You Forget the Security Code

When you forget the security code that has been registered and register a new security code from the beginning, follow these steps.




FieldMate is a configuration tool that performs numerous tasks, including initial setup, daily maintenance, troubleshooting, and configuration backup for device replacement. These tasks are streamlined by FieldMate’s intuitive operation and integrated environment, independent of communication protocols or device vendor.  Available off-line database function (up to 500 devices) maintains a complete record for all device configuration and maintenance activities. The FieldMate program can be loaded onto a PC or Tablet.

Fieldmate supports the following communication protocols:

See our Website for complete functionality

Note: A communication modem for the appropriate protocol is required to use this PC/Tablet based tool.


If the meter is password protected, the meter will display the message Locd (Locked) when the Menu button is pressed. Press the Enter button while the message is being displayed and enter the correct password to gain access to the menu. After exiting the programming mode, the meter returns to its password protected condition.

Disabling Password Protection

To disable the password protection, access the Password menu and enter the correct password twice, as shown below. The meter is now unprotected until a new password is entered.

If the correct six-digit password is entered, the meter displays the message unLoc (Unlocked) and the protection is disabled until a new password is programmed.

If the password entered is incorrect, the meter displays the message Locd (Locked) for about two seconds, and then it returns to Run Mode. To try again, press Enter while the Locked message is displayed.


If a Hart device is connected to the communicator but "Polling Address 0" appears or the device is not in the table of found devices, follow these steps:



• Prepare a standard 1/8 DIN panel cutout – 3.622" x 1.772" (92 mm x 45 mm).

• Clearance: allow at least 6.0" (152 mm) behind the panel for wiring.

• Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).

Recommended minimum panel thickness to maintain Type 4X rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm) plastic panel.

• Remove the two mounting brackets provided with the meter (back-off the two screws so that there is ¼" (6.4 mm) or less through the bracket. Slide the bracket toward the front of the case and remove).

• Insert meter into the panel cutout.

• Install mounting brackets and tighten the screws against the panel. To achieve a proper seal, tighten the mounting bracket screws evenly until meter is snug to the panel along its short side.

DO NOT OVER TIGHTEN, as the rear of the panel may be damaged.


When the parameters have been changed in a way that is difficult to determine what’s happening, it might be better to start the setup process from the factory defaults.

Instructions to load factory defaults:

1. Enter the Advanced Features menu. See Advanced Features Menu, page 67 of the instruction manual.

2. Press Up arrow to go to Diagnostics menu

3. Press and hold Right arrow for three seconds, press Enter when display flashes reset.  Note: If Enter is not pressed within three seconds, the display returns to Run Mode.

4. The meter goes through an initialization sequence (similar as on power-up), and loads the factory default settings.

  • Sizes 2.5 to 10 mm (0.1 to 0.4 in): 5 µS/cm or greater
  • Sizes 15 to 125 mm (0.5 to 5 in): 1 µS/cm or greater
  • Sizes 150 to 400 mm (6 to 16 in): 3 µS/cm or greater

When conductivity is below the 3 µS/cm, we recommend using the Enhanced Dual Frequency, HF2, option.

  • Sizes 25 to 200 mm (1 to 8 in): 10 µS/cm or greater.
  • Sizes 1000 mm (40") and below: 20 µS/cm or greater
  • Sizes 1100 mm (44") and above: 50 µS/cm or greater 
  • Sizes 15 to 100 mm (0.5" to 4"): 0.01 µS/cm or greater
  • Sizes 150 & 200 mm (6" & 8"): 1 µS/cm or greater 
  • For an integral flowmeter: 12 W
  • For a remote flowtube combined with an AXFA11 converter: 20 W
  • For a remote flowtube combined with an AXFA14 converter: 12 W 

The standard accuracy for the output of an AXF is 0.35% of Rate/Reading.

Yokogawa also offers a high grade accuracy calibration option which provides an accuracy of 0.2%.


Yokogawa diaphragm seal systems are available with an optional Flushing Ring.  A flushing ring is metal donut-shaped ring installed between the seal and the customer process connection. It is a wetted part. The ring has a port(s) that can be used to flush the surface of the diaphragm during cleaning. The ports are threaded and available in either ¼-inch or ½-inch sizes. The ports are available with extensions to make them easier to reach. The ring may also have ring holders to ensure the entire assembly aligns correctly to prevent leaks.

The ring can be referred to as a Calibration Ring. The flushing ports on the side of the ring allow the user to apply a calibration pressure and consequently calibrate the unit against that pressure. Calibration is accomplished by sandwiching the calibration ring between the remote seal and a blank process flange.

The ring can also serve as a reducer, a spacer, or a heat sink.

The ring is available as part of the diaphragm seal model code or as a separate line item.

Flushing Ring (R01)


Generally, you should order the bracket that is offered on the manifold, because if the transmitter needs to be disconnected, you don’t have to undo the piping or detach the flanged connection depending on the manifold type. However, make sure that the bracket used is feasible for your installation. Certain brackets have more configuration abilities than others. Pipe mount brackets are offered on manifolds from Parker PGI and Anderson Greenwood Division of Pentair.  


Larger diameter diaphragms have lower spring rates compared to smaller diameter diaphragms. Consequently, they are more flexible. As fill fluids contract and expand with temperature gradients from the process and ambient conditions, the larger diameter diaphragm can deflect without conveying a pressure change to the sensor. The smaller diameter, rigid diaphragm will not deflect as much and will cause drift in the pressure sensor reading proportional to the temperature change. This drift is usually small in magnitude.


This toolkit includes:

  • How to reduce boiler accidents
  • Best practices for optimizing pressure startup and combustion
  • How to accurately measure steam and carbon monoxide
  • The Top 3 things to consider in your boiler lifecycle

Download this eBook and learn:

  • The top challenges that drive reinstrumentation
  • How to plan for and achieve a successful project
  • Best practices in identifying your project scope
  • 5 ways to improve operator effectiveness
  • Different scenarios and best practices for updating, migrating or replacing process controls, safety systems, and instrumentation in plants
Instruction Manuals


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