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Yokogawa FLXA21 2-Wire Process Liquid Analyzer

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Yokogawa FLXA21

Measured parameters: pH, ORP (Redox Potential), Conductivity, Dissolved Oxygen (DO)

Measurement method: Potentiometric pH / ORP, Conductometric Conductivity

FLXA21 is a 2-wire process liquid analyzer that performs pH/ORP, conductivity and dissolved oxygen measurement. Sold, installed and serviced in Türkiye by Tetra.

Request a quote → Yokogawa product page ↗

Installation, calibration, spare parts and service in Türkiye come from Tetra; cabinet and panel integration can be done at our İzmir facility.

Technical information

Supply
24 VDC loop-powered, 2-wire
Output / communication
4-20 mA, HART
Number of sensors
Single or dual sensor
Area class
General purpose, Class I Div I/II

FLXA21 is a 2-wire modular liquid analyzer powered from a 24 VDC loop. Up to two detectors of the same type can be connected, so measurement is not interrupted while one is under maintenance. It can measure pH/ORP/rH, conductivity/resistivity, inductive conductivity (ISC40 series) and dissolved oxygen (galvanic or polarographic).

FLXA21 features

  • Touchscreen, 12 languages; quick setup guide.
  • Impedance, asymmetry potential and slope are monitored continuously; the last five calibration records are used to predict maintenance time.
  • Standard pH range -2 to 16, 0-14 with the /K option.
  • HART over 4-20 mA; optional FOUNDATION Fieldbus and Profibus.
  • Polycarbonate housing IP66; ATEX, IECEx, FM, CSA, NEPSI intrinsically safe approvals.

The manufacturer's application examples include boiler feedwater, flue gas desulfurization (FGD) scrubbers, aeration basin dissolved oxygen and wastewater treatment.

Choosing FLXA21

The instrument recognizes a dirty, damaged or broken electrode, a cable break and low liquid level. Conductivity cells with a cell constant between 0.005 and 50 cm⁻¹ can be connected; because the design is modular, it can be expanded later.

Tetra determines the sensor type and cable distance (BA10/WTB10 extension box if needed), and carries out commissioning, sensor calibration and electrode replacement in Türkiye.

Spare parts and consumables

Write to us for spare parts and consumables; the Tetra service team supplies and replaces the right original parts for your instrument.

Ask about spare parts →

Products from Yokogawa

Yokogawa Yokogawa FLXA202 2-Wire pH/ORP and Conductivity Analyzer Yokogawa FLXA202 is a 2-wire pH/ORP and conductivity (SC) transmitter for water treatment and process water; sold and serviced in Türkiye by Tetra. View → Yokogawa Yokogawa FLXA402 4-Wire Multi-Channel Liquid Analyzer FLXA402 is a modular 4-wire, multi-channel process liquid analyzer for pH/ORP, conductivity and dissolved oxygen sensors. Sold and serviced in Türkiye by Tetra. View → Yokogawa Yokogawa GC8000 Process Gas Chromatograph Yokogawa GC8000 is a process gas chromatograph that performs component analysis on refinery and petrochemical streams; sold and serviced in Türkiye by Tetra. View → Yokogawa Yokogawa RAKD41 Valved Variable Area Flow Meter Yokogawa RAKD41 is a valved rotameter showing flow of fluids such as naphtha, propylene and diesel, with low-flow alarm option; from Tetra in Türkiye. View → Yokogawa Yokogawa TDLS8000 In-Situ Laser Gas Analyzer TDLS8000 is a tunable diode laser spectrometer that measures gas in the process in situ by laser, without sampling. Sold and serviced in Türkiye by Tetra. View → Yokogawa Yokogawa TDLS8200 Probe-Type Laser Gas Analyzer TDLS8200 is a probe-type tunable diode laser analyzer flange-mounted from one side, measuring without sampling. Sold and serviced in Türkiye by Tetra. View →
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