Yokogawa FLXA21-D-P-D-AB-P1-NN-A-N-LA-N-NN/U Digital Analyzer

Product Overview

The Yokogawa FLXA21-D-P-D-AB-P1-NN-A-N-LA-N-NN/U is a 2-Wire Modular Digital Liquid Analyzer designed for industrial process measurement applications. It is part of the Yokogawa FLXA21 series and is used for pH/ORP, conductivity, inductive conductivity, and dissolved oxygen (DO) measurement depending on the installed sensor module.

This specific configuration is a pH/ORP analyzer version, featuring a plastic housing, anti-glare LCD display, single pH/ORP input, and 4–20 mA output with HART communication. It is widely used in water treatment, chemical processing, power plants, food & beverage, and pharmaceutical industries.

Main Specifications

• Manufacturer: Yokogawa
• Model: FLXA21-D-P-D-AB-P1-NN-A-N-LA-N-NN/U
• Series: FLXA21
• Product Type:
  • Digital Liquid Analyzer
  • 2-Wire Process Analyzer
  • pH/ORP Transmitter
• Measurement Type:
  • pH measurement
  • ORP (Redox) measurement
• Input Configuration:
  • 1 × pH/ORP sensor input
• Output:
  • 4–20 mA DC
  • HART communication
• Power Supply:
  • 24 V DC loop powered (2-wire system)

Model Code Explanation

FLXA21-D-P-D-AB-P1-NN-A-N-LA-N-NN/U

Technical Specifications

Measurement

pH Measurement

• Measuring Range:
  • pH -2 to 16
• Accuracy:
  • ±0.01 pH
• Repeatability:
  • ±0.01 pH

ORP Measurement

• Measuring Range:
  • -1500 to +1500 mV
• Accuracy:
  • ±1 mV

Temperature Compensation

Supported temperature sensors:

• Pt100
• Pt1000
• PTC10k
• NTC
• Other compatible temperature elements

Display & Operation

• Display Type:
  • LCD touch screen
• Display Function:
  • Process value display
  • Alarm status
  • Calibration information
  • Diagnostic messages
  • Parameter configuration
• Language Support:
  • English
  • Chinese
  • Japanese
  • German
  • French
  • Spanish
  • Other languages

Communication Specifications

Analog Output

• Signal:
  • 4–20 mA DC
• Type:
  • Isolated current output

Digital Communication

• Protocol:
  • HART communication

Optional versions support:

• FOUNDATION Fieldbus
• PROFIBUS PA

Mechanical Specifications

Features & Advantages

• Original Yokogawa industrial analyzer
• Modular design supports multiple liquid measurement applications
• High accuracy pH and ORP measurement
• Built-in sensor diagnostic functions
• Supports HART communication for remote monitoring
• Touch-screen operation improves usability
• Low-power 2-wire loop-powered design
• Suitable for hazardous and industrial environments
• Reduces maintenance cost through predictive diagnostics

Applications

Used in:

• Water and wastewater treatment
• Chemical processing plants
• Power generation facilities
• Pharmaceutical production
• Food and beverage processing
• Semiconductor manufacturing
• Environmental monitoring systems

Typical applications:

• pH control loops
• Neutralization systems
• Chemical dosing control
• Water quality monitoring
• Process liquid analysis