2-Wire Dual Channel Transmitter/Analyzer FLXA21 Yokogawa FLXA21 Liquid Analyser (PH/ORP Transmitter)
Brand Name:Yokogawas
Model Number:FLXA21
Minimum Order Quantity:1 pc
Delivery Time:7-14 days
Payment Terms:T/T
Place of Origin:China
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Product Details
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) |
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.
2-Wire Dual Channel Transmitter/Analyzer FLXA21 Yokogawa FLXA21 Liquid Analyser (PH/ORP Transmitter)
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