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K9702GA Module, YOKOGAWA FLXA21 Two-wire pH Meter/ORP Meter
Overview of FLXA21 Modular Two-wire pH Meter/ORP Meter:
The FLXA21 is a new generation of modular liquid analyzers that can be flexibly configured for measuring pH/ORP, contact conductivity, inductive conductivity, or dissolved oxygen. The FLXA21 can connect two sensors of the same model simultaneously, thus reducing installation costs and saving space, and configuring a highly reliable dual-sensor measurement system. The FLXA21 has advanced and reliable features and functions, such as a touch screen to improve operability, sensor self-diagnosis function, maintenance time estimation function, and display options in 7 languages.
The FLXA21 two-wire liquid analyzer can connect one or two sensors for measurement. The analyzer is modularly designed. By using different sensor modules, the following four measurement purposes can be achieved: pH/ORP (oxidation-reduction potential), contact conductivity (SC), inductive conductivity (ISC), or dissolved oxygen (DO).
The FLXA21 modular two-wire pH meter/ORP meter has a built-in buffer solution table for calibration, and has temperature compensation and stability check functions, enabling high-precision pH measurement. It can measure not only pH but also temperature and oxidation-reduction potential (ORP).
The sensor's diagnostic function can continuously measure resistivity, asymmetry potential, slope, etc., and continuously diagnose the sensor status, such as electrode contamination and damage, thermocouple breakage, and measurement liquid level drop. In addition, it can save at least the five latest calibration results and predict the maintenance and calibration time.
To be widely used in industrial environments, the FLXA21 pH meter/ORP meter has different enclosures to choose from: plastic, stainless steel, or stainless steel with anti-corrosion coating.
Two-wire dual-sensor measurement and analysis system, capable of single pH/ORP sensor measurement or dual pH/ORP sensor system measurement
Calculation of dual-sensor measurement data
Redundant measurement system of dual sensors
Touch screen design of two-wire analyzer, enhanced operability
Simple HMI menu structure in 7 languages
Quick setting menu for direct measurement
Online sensor inspection and display of sensor status
HART
CommunicationThe enclosure can be made of plastic, stainless steel, or stainless steel with an anti-corrosion coating.
Specifications of FLXA21 Modular Two-wire pH/ORP Meter
Measurement principle: Glass electrode method
Measurement range: pH: -2 to 16 pH; ORP: -1500 to 1500 mV; rH: 0 to 100 rH
Temperature: -30 to 140°C (Pt1000)
Transmission signal (conventional): One-way 4 to 20 mA DC output. Bidirectional HART® digital communication, superimposed on the mA (4 to 20 mA) signal.
Thermocouple break function: Signal fault exceeding the upper limit (22.0 mA) or lower limit (3.6 mA), NAMUR NE43.
Temperature compensation function: Automatic or manual. Nernst equation compensation. Temperature coefficient can be set for process measurement compensation, NEN6411 or programmable matrix.
Calibration: Semi-automatic 1-point calibration, or 2-point calibration (using pre-set NIST, US, DIN buffer solution tables (pH 4, 7, 9) or user-defined buffer solution tables), with automatic stability check and manual adjustment for sampling.
Display: Black/white (213 x 160 pixels) LCD with touch screen.
Explosion-proof grade: ATEX, IECEx, FM, CSA (pending application)
Analyzer structure: Modular structure
Enclosure: Plastic (polycarbonate), uncoated stainless steel, stainless steel with epoxy coating, stainless steel with polyurethane coating
Viewing window: Polycarbonate
Protection grade: NEMA4X, IP66
Environmental and operating conditions: Ambient temperature: -20 to +55°C
Storage temperature: -30 to +70°C
Humidity: 10 to 95% RH (non-condensing)
Safety specifications: Safety: EN61010-1, CSA C22.2 No.61010-1 (pending application)
EMC: EN61326-1 Class A, Table 2 (for industrial sites), EN61326-2-3, AS/NZS CISPR11
Installation height: Below 2000 m
Installation complies with IEC 61010: I
Pollution level complies with IEC 61010: 2
Power supply Standard 24V DC loop power supply system
One sensor: 16～40V DC
Two sensors: 22.8～40V DC
Conduit fitting G1/2, 1/2NPT, M20 x 1.5
Mass Approximately 1kg (plastic housing), approximately 2kg (stainless steel housing)
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