Profibus Conductivity Transmitter/Analyzers

PROFIBUS는 공장 자동화 및 공정 자동화를 포괄하는 개방형 디지털 통신 시스템입니다. 이 분석기는 PROFIBUS 통신을 사용하는 2 선식 (루프 전원 공급) 시스템 구성을 위해 설계되었습니다.

Series (2)


Model Code FLXA21-D-P-D-A*-C1-NN-P-N-LA-N-NN      FLXA21-D-P-D-C*-C1-NN-P-N-LA-N-NN
Area Classification

General Purpose

  • Class I Div II (without the use of IS Barrier)
  • Class I Div I (with the use of IS Barrier)
Measurement Type Contacting Conductivity, Resistivity
Enclosure Material Plastic (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 IP66 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 method Frequency, read-pulse position and reference voltage are dynamically optimized.
Input ranges Conductivity:
  Minimum: 0 μS/cm
  Maximum: 200 mS x C (overrange 1999 mS/cm).
  Minimum: 0.005 kΩ/C
  Maximum: 999 MΩ x cm
  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)


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)


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

Accuracy: ±0.4°C (Pt100, NTC8k55)

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)

Step Response ≤8 seconds for 90 % (for 2 decade step)
Output Span Conductivity: 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 Signals Isolated 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).
Compensation algorithm

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

Communications PROFIBUS-PA
Ambient temperature -20 to 50 °C
Humidity 10 to 90 % RH (Non-condensing)
Display Black/White 213 x 160 pixels LCD with touch screen
Power supply Nominal 24 volt DC loop powered system.



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