China 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Yokogawa FLXA21 Liquid Analyser (PH/ORP Transmitter) for sale

2-Wire Dual Channel Transmitter/Analyzer FLXA21 Yokogawa FLXA21 Liquid Analyser (PH/ORP Transmitter)

Price Negotiable

Price: USD 1600

MOQ: 1 pc

Delivery Time: 7-14 days

Brand: Yokogawas

Product Description

1. Overview

The FLXA21 is a 2‑wire, dual-channel liquid analyzer from Yokogawa.
It supports two sensor inputs of the same type, enabling duplex measurement or redundancy.
Compatible with a variety of detectors: pH/ORP, conductivity (contacting), inductive conductivity, and dissolved oxygen.
Part of Yokogawa’s OpreX measurement family.

2. Key Features

Feature	Description
Redundancy / Dual Input	Can connect two sensors of the same type (e.g., two pH probes) for backup/reliable measurement or continuous operation during maintenance.
Self-Diagnosis	Continuously monitors the detector for impedance, slope, asymmetric potential, etc., to detect issues such as dirty or damaged electrodes or low liquid level.
Maintenance Forecasting	Saves the last five calibrations and predicts when maintenance or recalibration is needed.
User Interface	Touch screen with guided “Quick Setup” menus.
Modular Design	Modular structure allows flexible system configuration and easy expansion
Language Support	Interface supports 12 languages (e.g., English, Chinese, Japanese, German, etc.).
Certifications	Available in intrinsically safe versions: ATEX, IECEx, FM, CSA, NEPSI.
Communication	Standard output is 4–20 mA + HART. Optionally supports FOUNDATION Fieldbus or PROFIBUS.

3. Performance / Specs

Here are some key technical specifications from the manufacturer:

Parameter	Specification
Power Supply	2-wire loop-powered, 24 VDC
Housing / Enclosure	Polycarbonate or stainless steel; rated IP66 / NEMA 4X
Operating Temperature	–20 °C to +55 °C (typical)
Measurement Ranges	• pH: –2 to 16 (or 0–14 with option) • ORP: –1500 to +1500 mV • Conductivity: supports cell constants 0.005 to 50 cm⁻¹, cable length up to 60 m • Inductive conductivity: up to 2000 mS/cm • Dissolved Oxygen: 0–50 mg/L for galvanic sensor, 0–50 μA input (depending on type)
Temperature Compensation	Supports various temperature elements (Pt100, NTC, etc.)

4. Advantages & Use Cases

Advantages:

Reliability: With dual sensors, you get redundancy to avoid downtime.
Maintenance Efficiency: Built-in diagnostics and calibration memory can reduce OPEX (operational cost).
Flexibility: The modular design makes it easy to adapt to different measurement needs / parameters.
Communication: Digital (HART) ensures better integration and remote diagnostics.

Typical Use Cases:

Process control in water & wastewater treatment
pH / ORP monitoring in chemical and petrochemical plants
Conductivity measurement in industrial processes (including pure water, boiler water)
Dissolved oxygen monitoring in bioreactors or water treatment plants

5. Limitations / Considerations

Requires two sensors of the same type for dual-channel functionality — you cannot mix different sensor types.
As a 2-wire device, the power supply is limited to 24 VDC loop, which may impose constraints in some installations.
While self-diagnosis is helpful, some calibration and maintenance are still needed periodically.

6. Summary

The Yokogawa FLXA21 is a robust, modular, and redundant-capable 2-wire liquid analyzer. It’s well-suited for industrial environments where reliability, diagnostics, and long-term maintenance savings are important. It supports a broad range of sensor types (pH/ORP, conductivity, DO), and its self-diagnostics and dual-sensor capability make it a strong choice for critical process measurement applications.