Yokogawa FLXA21 Dual Channel Analyzer | pH/ORP/Conductivity Transmitter

Yokogawa FLXA21 2-wire analyzer. Dual inputs, 4-20mA/HART, supports pH, ORP, conductivity, resistivity, DO. Universal, modular design.

Product: Yokogawa FLXA21 Dual Channel Analyzer / Transmitter

The Yokogawa FLXA21 is a versatile, modular 2-wire loop-powered analyzer designed to measure and transmit a wide range of liquid analytical parameters. Its universal design supports multiple sensor types, allowing for flexible configuration in various process monitoring applications.

Key Features

• Universal Input:​ Accepts signals from pH/ORP, conductivity, resistivity, and dissolved oxygen sensors.

• Dual Channel:​ Can monitor two independent or dependent parameters simultaneously.

• Loop-Powered:​ Simple 2-wire, 4-20 mA with HART 7 communication for easy installation and integration.

• Modular & Scalable:​ Flexible design with interchangeable input/output and communication modules.

Technical Specifications (Based on Model Code Breakdown)

• Model Code:​ FLXA21-D-P-D-A-B-C1-NN-A-N-L4-HN

• Series:​ FLEXA™ FLXA21

• Power & Communication:​ 2-wire, 4-20 mA DC with HART 7 (2-W)

• Input Type:​ Dual Channel

• Channel 1 Function (D-P-...):

  • D:​ 4-20 mA input (for analyzer/transmitter input)

  • P:​ pH/ORP measurement

• Channel 2 Function (...-D-A-...):

  • D:​ 4-20 mA input (for analyzer/transmitter input)

  • A:​ Conductivity/Resistivity measurement

• Housing:​ Field-mount housing (B)

• Display:​ Large dot-matrix LCD with backlight (C1)

• Electrical Conduit Openings:​ 2 x 1/2" NPT (NN)

• Coating/Finish:​ Standard (A)

• Power Supply Voltage:​ 24 V DC nominal (N)

• Language:​ English (L4)

• Calibration Solution:​ Not specified/included (HN)

General Specifications

• Input Signals:​ pH/ORP, Conductivity/Resistivity, Dissolved Oxygen, 4-20 mA

• Output Signal:​ 4-20 mA DC with HART (per channel)

• Power Supply:​ 12 to 42 V DC (loop-powered)

• Enclosure Rating:​ NEMA 4X / IP66

• Ambient Temperature:​ -20 to 60 °C (-4 to 140 °F)

• Certifications:​ FM, ATEX, IECEx, SIL 2 compliant

Typical Applications

• Water and wastewater treatment

• Pharmaceutical and biotech processes

• Power plant water chemistry

• Chemical production

• Food and beverage industry

Critical Configuration Note

This is a fully-configured order code.​ The code FLXA21-D-P-D-A-B-C1-NN-A-N-L4-HN​ specifies a dual-channel unit with:

• Channel 1:​ Configured for a pH/ORP sensor input.

• Channel 2:​ Configured for a conductivity/resistivity sensor input.

  Always verify this configuration matches your exact sensor types and application requirements. The transmitter requires compatible Yokogawa or third-party sensors.

Note: Specifications are derived from the standard FLXA21 modular code structure. This is a sophisticated analyzer. For complete configuration details, wiring, and programming, consult the official Yokogawa FLXA21 General Specifications (GS) and User's Manual.

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