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  • Fieldbus Conductivity Transmitter/ Analyzer

Fieldbus Conductivity Transmitter/ Analyzer

2016-05-27 13:09:47

Description:

Fieldbus Foundation defines "Fieldbus is a digital, two-way, multi-drop communication link among intelligent measurement and control devices." It is one of several local area networks dedicated for industrial automation. The Internet is having a major impact on information flows. Yesterday's hierarchical systems the field signals used in process instrumentation have been standardized so that control systems and field devices from a variety of suppliers can be interconnected using standard 4 to 20 mA analog signals. A "standardized" digital communication for industrial automation is changing the production system. The FOUNDATION™ fieldbus standard developed by the Fieldbus Foundation™ constitutes the next level of standardization and it is designed to meet modern needs. In addition to having interconnectivity equivalent to that available using 4 to 20 mA analog signals in a conventional field network, FOUNDATION™ fieldbus allows multiple devices to be connected to a single FOUNDATION™ fieldbus, permits the interactive communication of various types of information, and enables the distribution in the field of intelligent functions including self-diagnostics and control functionality. When FOUNDATION™ fieldbus was first proposed, more attention was given to its ability to convey multiple field signals over a single cable and the benefit this would have in reducing wiring costs. But now the focus is on its ability to transmit various types of information in addition to field signals and to distribute intelligence to distributed field devices. These features enable remote monitoring, real-time self-diagnostics, and proactive maintenance of field devices, as well as plant resource management using field communication. This will enable the costs of operating instrumentation systems to be greatly reduced.……

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Description

Fieldbus Conductivity Transmitter/ Analyzer

Fieldbus Foundation defines "Fieldbus is a digital, two-way, multi-drop communication link among intelligent measurement and control devices." It is one of several local area networks dedicated for industrial automation. The Internet is having a major impact on information flows. Yesterday's hierarchical systems the field signals used in process instrumentation have been standardized so that control systems and field devices from a variety of suppliers can be interconnected using standard 4 to 20 mA analog signals. A "standardized" digital communication for industrial automation is changing the production system.

The FOUNDATION™ fieldbus standard developed by the Fieldbus Foundation™ constitutes the next level of standardization and it is designed to meet modern needs.  In addition to having interconnectivity equivalent to that available using 4 to 20 mA analog signals in a conventional field network, FOUNDATION™ fieldbus allows multiple devices to be connected to a single FOUNDATION™ fieldbus, permits the interactive communication of various types of information, and enables the distribution in the field of intelligent functions including self-diagnostics and control functionality.

When FOUNDATION™ fieldbus was first proposed, more attention was given to its ability to convey multiple field signals over a single cable and the benefit this would have in reducing wiring costs. But now the focus is on its ability to transmit various types of information in addition to field signals and to distribute intelligence to distributed field devices. These features enable remote monitoring, real-time self-diagnostics, and proactive maintenance of field devices, as well as plant resource management using field communication. This will enable the costs of operating instrumentation systems to be greatly reduced.

Model CodeFLXA21-D-P-D-AA-C1-NN-FNot Available at this timeFLXA21-D-P-D-AA-C5-NN-F Not Available at this time
Area Classification General Purpose

  • Class I Div II (without the use of IS Barrier)

  • Class I Div I (with the use of IS Barrier)

General Purpose

  • Class I Div II (without the use of IS Barrier)

  • Class I Div I (with the use of IS Barrier)

Measurement TypeContacting Conductivity, ResistivityInductive, Torodial, Non-Contacting Conductivity
Enclosure MaterialPlastic (Polycarbonate)

Flexibility, reliability and low maintenance are among the benefits provided by the FLXA21 conductivity analyzer. Designed to meet the particular requirements of measuring conductivity and resistivity in the modern industrial environment, it contains many features to ensure the best precision whatever the application. 

The transmitter is housed in a robust IP65 field mountable case and combined with the easy and clear LCD makes the FLXA21 a complete industrial transmitter. The logbook can be used to record events like calibrations and diagnostic messages. A wide variety of temperature compensation possibilities (NaCl according to IEC 746-3, manual TC, preprogrammed matrices and a free programmable 5x5 matrix), provide a high-accuracy measurement with a minimum effort. The addition of a USP23 pure water monitoring feature also makes the FLXA21 suitable for the pharmaceutical industry. 

Yokogawa has implemented three leading process Fieldbus technologies in their FLXA21 series: HART, Foundation Fieldbus H1 and Profibus PA. All transmitters are provided with the important and widely used Device Description files that provide information on parameters and other data in each device, as well as the ability to include algorithmic relationships such as calibrations.

  • Universal conductivity/resistivity, software switchable

  • On-line sensor checking

  • Event logbook in software

  • Matrix temperature compensation for pure water applications

  • Password protection for all levels of software

  • Intrinsically safe version and non-incendive versions

  • Pharmaceutical pure water monitoring (USP23)

  • Autoranging from 0.01 µSxC.C to 200mSxC.C.

  • HART, Foundation Fieldbus, or Profibus Communications options

  • Extremely wide measuring range (> 6 decades) while maintaining a high resolution and accuracy using only one sensor type.

  • Free programmable setting of the output range, including a 21-step table output to linearize the output function e.g. to % by weight.

  • Programmable % by weight display indication.

  • Can be password protected

Input specifications

Two or four electrode measurement with square wave excitation.
Cell constant from 0.008 to 50.0 cm-1; Yokogawa ISC40 Sereis Inductive Sensor

Detection methodFrequency, read-pulse position and reference voltage are dynamically optimized.
Input rangesConductivity:
  Minimum: 0 μS/cm
  Maximum: 200 mS x C (overrange 1999 mS/cm).
Resistivity:
  Minimum: 0.005 kΩ/C
  Maximum: 999 MΩ x cm
Temperature:
  Pt1000: -20 to 250°C (0 to 500°F)
  Pt100 and Ni100: -20 to 200°C (0 to 400°F)
  8k55 NTC: -10 to 120°C (10 to 250°F)
  PB36 NTC: -20 to 120°C (0 to 250°F)
Contacting Conductivity

Accuracy: ±0.5 % F.S. (1 μS x K cm-1 to 200 mS x K cm-1); 

Accuracy: ±1 % F.S. (1 μS x K cm-1 to 2 μS x K cm-1)

Resistivity

Accuracy: ±0.5 % F.S. (0.005 kΩ/K cm-1 to 0.5 MΩ/K cm-1); 

Accuracy: ±7 % F.S. (0.5 MΩ/K cm-1 to 1 MΩ/K cm-1)

Inductive Conductivity

Output span is 0-100 μS or more

Linearity±(0.4 % FS + 0.3 μS/cm)

Repeatability±(0.4 % FS + 0.3 μS/cm)

Temperature

Accuracy: ±0.3°C (Pt1000, PB36NTC, Ni100); 

Accuracy: ±0.4°C (Pt100, NTC8k55)

Step Response≤8 seconds for 90 % (for 2 decade step)
Output SpanConductivity: Min. 0.01 μS/cm, Max. 1999 mS/cm. (Max 90 % zero suppression)
Resistivity: Min. 0.001 kΩ x cm, Max. 999 MΩ x cm. (Max 90 % zero suppression)
Transmission SignalsIsolated output of 4 to 20 mA DC. Burn up (21 mA) or Burn down (3.6 mA when HART or distributor comm. is non-used, 3.9 mA when HART or distributor comm. is used) or pulse of 21 mA to signal failure.
Temperature compensation

Automatic, for temperature ranges
Reference temp.: programmable from 0 to 100°C or 30 to 210°F (default 25°C).

NaCl according to IEC 60746-3 tables.
Two T.C. setting possible between 0.00 to 3.50 %/°C
Matrix: user selectable/configurable.
Reference temperature adjustable between -20 to 140°C

Compensation algorithmNaCl: According IEC60746-3 NaCl tables (default).
T.C: Two independent user programmable temperature coefficients, from 0 to 3.5 % per °C (°F) by adjustment or calibration.
Matrix: Conductivity function of concentration and temperature. Choice out of 5 preprogrammed matrices and a 25-point user programmable matrix.
CommunicationsFOUNDATION Fieldbus H1
Ambient temperature-20 to 50 °C
Humidity10 to 90 % RH (Non-condensing)
DisplayBlack/White 213 x 160 pixels LCD with touch screen
Power supplyNominal 24 volt DC loop powered system.