Description

YOKOGAWA FLXA21 2‑Wire Liquid Analyzer Transmitter

Technical Specifications

• Product Model: FLXA21
• Brand: Yokogawa
• Warranty: One Year
• Input Voltage: 17‑40 V DC two‑wire loop‑power supply
• Operating Temperature: ‑20 °C ~ +140 °C (sensor dependent)
• Storage Temperature: ‑40 °C ~ +85 °C
• Response Time: 90 % step response ≤8 s
• Protection Class: IP66 / NEMA 4X field‑mount housing
• Accuracy Class: pH ±0.01 pH; ORP ±1 mV; conductivity ±0.4 %FS; DO ±0.3 °C temperature measurement
• Output Frequency: Not applicable
• Rated Current: Loop‑powered, max 22 mA
• Measuring Parameters: pH, ORP, conductivity, electromagnetic conductivity, dissolved‑oxygen
• Communication: 4‑20 mA+HART7; optional PROFIBUS‑PA / FOUNDATION Fieldbus
• Sensor Support: Wide range of Yokogawa liquid‑analysis sensors
• Diagnostics: Sensor fault detection, calibration history storage, predictive‑maintenance reminder
• Display: Local touch‑screen multi‑language display
• Mounting: Field pipe‑mount or wall‑mount installation
• Certifications: ATEX, IECEx, FM, CSA intrinsically‑safe, CE, RoHSYokogawa E…
• Humidity: 5‑95 % RH, non‑condensing
• Weight: 1.35 kg
• Dimensions: 140 × 140 × 105 mm
• 

Product Overview

FLXA21 is a modular two‑wire field‑mount liquid‑analyzer transmitter for process‑industry water‑quality monitoring. It supports multi‑parameter liquid‑analysis sensors for pH, ORP, conductivity and dissolved‑oxygen measurement. Built‑in sensor self‑diagnosis records calibration logs and predicts maintenance cycles. HART / fieldbus digital communication enables remote parameter configuration and real‑time data uploading to DCS systems. Widely deployed in water‑treatment, pharmaceutical, food‑beverage and chemical‑plant process‑monitoring loops. Available as new‑old‑stock and refurbished spare parts for on‑site analyzer‑system maintenance and sensor‑retrofit projectsYokogawa E….

Application Notes

‑ Match corresponding Yokogawa measuring sensor for target process parameter. ‑ Complete on‑site calibration after sensor installation. ‑ Follow intrinsic‑safety wiring specifications for hazardous‑area installation. ‑ Typical deployment: water‑wastewater treatment plant, pharmaceutical factory, chemical‑plant liquid‑analysis‑loop spare‑part stocking.