Description

Yokogawa FLXA21 (FLEXA series two-wire liquid analyzer) Overview
FLXA21 is a two-wire, dual-channel, modular liquid analyzer from Yokogawa’s FLEXA series, replacing the original EXA202 series. It supports four measurements: pH/ORP, conductivity, induced conductivity, and dissolved oxygen (DO). It can be connected to 1 or 2 sensors of the same type, supporting redundancy / dual measurement, loop power supply, HART communication, and is suitable for continuous monitoring in industrial environments.

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Basic parameters
Brand: Yokogawa
Model: FLXA21
Series: FLEXA (Flexible EXA)
Power Supply: Two-wire 24V DC loop power supply (9–32V DC)
Output: 4–20mA DC + bidirectional HART; optional PROFIBUS PA / FOUNDATION Fieldbus
Enclosure: Polycarbonate, IP66 / NEMA 4X, high protection level
Display: LCD touchscreen, multiple parameters on one screen, Chinese / English menus
Weight / Dimensions: Approximately 1.2 kg; 144 × 144 × 88 mm
Explosion-proof: ATEX, IECEx, FM, CSA, NEPSI intrinsically safe certifications
Measurement types and ranges (interchangeable modules)
pH/ORP: pH 0–14; ORP -1500 to +1500 mV; temperature -10 to 105°C
Conductivity (SC): 0.000 μS/cm to 2000 mS/cm; resistivity 0–1000 MΩ·cm
Inductive conductivity (ISC): suitable for high conductivity / high contamination media, no electrode contact
Dissolved oxygen (DO): 0–50 mg/L (ppm); 0–200% saturation; temperature -20 to 150°C
Accuracy (25°C)
pH: ±0.02 pH; ORP: ±1 mV
Conductivity: ±0.5% FS (2 μS/cm – 200 mS/cm)
Dissolved oxygen: ±0.05 mg/L or ±0.8% FS (take the larger value)
Temperature: ±0.3°C (Pt1000)

Typical application
Chemical / Petrochemical: Monitoring of pH, conductivity, and dissolved oxygen in process water, circulating water, and wastewater
Electricity: Quality analysis of boiler feed water, condensate water, and cooling water
Water treatment: Monitoring of municipal sewage and industrial wastewater discharge
Pharmaceutical / Food: Monitoring of pure water, injection water, and cleaning water
Metallurgy / Semiconductor: Measurement of conductivity and resistivity of high-purity water and etching solution