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K9702GD 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 enabling the configuration of a highly reliable dual-sensor measurement system. The FLXA21 features advanced and reliable characteristics and functions, such as a touch screen to improve operability, sensor self-diagnosis function, maintenance time prediction function, and display options in 7 languages.
The FLXA21 two-wire liquid analyzer can connect one or two sensors for measurement. The analyzer adopts a modular design. 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 offers different enclosures to choose from: plastic, stainless steel, or stainless steel with an 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 the two-wire analyzer, enhancing 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.
FLXA21 Modular Two-wire pH/ORP Meter Specifications
Measurement Principle: Glass electrode method
Measurement Range: pH: -2 to 16pH; ORP: -1500 to 1500mV; rH: 0 to 100rH
Temperature: -30 to 140℃ (Pt1000)
Transmission Signal: Conventionally, one 4 to 20mA DC output. Bidirectional HART® digital communication, superimposed on the mA (4 to 20mA) signal.
Open Circuit Function: Signal failure exceeding the upper limit (22.0mA) or lower limit (3.6mA), 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 tables (pH4, 7, 9) or user-defined buffer tables), with automatic stability check and manual adjustment sampling.
Display: Black/White (213 x 160 pixels) LCD with touch screen.
Explosion-proof Rating: ATEX, IECEx, FM, CSA (Pending)
Analyzer Structure: Modular structure
Enclosure: Plastic (polycarbonate), uncoated stainless steel, stainless steel with epoxy coating, stainless steel with polyurethane coating
Window: Polycarbonate
Protection Rating: NEMA4X, IP66
Environmental and Operating Conditions: Ambient Temperature: -20 to +55℃
Storage Temperature: -30 to +70℃
Humidity: 10 to 95%RH (non-condensing)
Safety Specifications: Safety: EN61010-1, CSA C22.2 No.61010-1 (Pending)
EMC: EN61326-1 Class A, Table 2 (for industrial sites), EN61326-2-3, AS/NZS CISPR11
Installation Height: Below 2000m
Installation complies with IEC 61010: I
The 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 joint G1/2, 1/2NPT, M20 x 1.5
Mass Approximately 1kg (plastic housing), approximately 2kg (stainless steel housing)
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