FLXA21 Yokogawa OpreX Analyzers Datasheet & Technical Manual

Yokogawa FLXA21 pH ORP Conductivity Dissolved Oxygen Controller

Yokogawa FLXA21 pH ORP Conductivity Dissolved Oxygen Controller

Availability: 20 left in stock

Yokogawa FLXA21 Modular 2-Wire Liquid Analyzer The Yokogawa FLXA21-D-P-D-AB-C1-NN-A-N-LA-N-NN/UM/CD4, also cataloged as the FLXA21 Liquid Analyzer Controller, operates as a...

SKU: FLXA21

Manufacturer: Yokogawa
Product No.: FLXA21
Product Type: Liquid Analyzers
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 1000g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa FLXA21 Modular 2-Wire Liquid Analyzer

The Yokogawa FLXA21-D-P-D-AB-C1-NN-A-N-LA-N-NN/UM/CD4, also cataloged as the FLXA21 Liquid Analyzer Controller, operates as a dedicated hardware component for continuous online liquid property measurement within OpreX Analyzers platforms and CENTUM VP DCS integrated architectures. Operating on a 2-wire 24 VDC loop-powered circuit, the analyzer processes field signals for pH/ORP, contacting conductivity, inductive conductivity, and dissolved oxygen parameters. The unit executes direct dual-sensor signal processing and converts sensor inputs into an isolated 4-20 mA DC analog output superimposed with digital HART, FOUNDATION Fieldbus, or PROFIBUS PA communication protocols.

Hardware Specifications

Parameter	Specification
Model	FLXA21-D-P-D-AB-C1-NN-A-N-LA-N-NN/UM/CD4
Brand	Yokogawa
Origin	Japan
Weight	1 kg (Plastic housing) / 2 kg (Stainless steel)
Dimensions	144 x 144 x 151 mm (Plastic) / 165 x 165 x 160 mm (Stainless)
Operating Temp	-20 to +55 deg C
Power Consumption	24 VDC loop powered (Operating voltage 17 to 40 VDC)
Output Signal	Isolated 4-20 mA DC, 2-wire system
Digital Protocol	HART, FOUNDATION Fieldbus, or PROFIBUS PA
Display	Black/white LCD touch screen (213 x 160 pixels)
Ingress Protection	IP66 / NEMA 4X rated
Sensor Inputs	Up to 2 sensors of the same measurement type
Measurement Types	pH/ORP, contacting conductivity, inductive conductivity, dissolved oxygen

Process Control & DCS Instrumentation Characteristics

Configured for field deployment, the analyzer executes continuous sensor diagnostics including glass electrode impedance monitoring, polarization detection, and sensor slope calculations to predict maintenance intervals. The 4-20 mA HART loop protocol passes primary variable data along with secondary diagnostic flags directly to host controller systems. Channel-to-channel isolation prevents ground loop current interference when connecting two liquid sensors to a single transmitter chassis, maintaining signal integrity across long cable distances.

Frequently Asked Questions

Q: How does the dual-sensor capability operate on the FLXA21 analyzer platform?

A: The analyzer accepts up to two physical sensors of the same measurement type (such as two pH electrodes or two conductivity cells). The internal signal processor continuously reads both channels, enabling dual-point monitoring, redundant sensor failover, or average value output calculation to the host control system.

Q: What line power requirements and wiring constraints apply to this 2-wire analyzer?

A: The analyzer derives operational power directly from the 24 VDC signal loop. The DC supply voltage must remain between 17 VDC and 40 VDC at the analyzer terminals, accounting for loop resistance across the 4-20 mA current wire run.

Q: How does the unit maintain measurement accuracy under harsh process conditions?

A: The housing features an IP66 and NEMA 4X ingress protection rating to resist moisture and corrosive vapors. Furthermore, internal software algorithms apply continuous temperature compensation via Pt1000 or NTC thermistor inputs to correct raw liquid measurement signals in real time.

Field Installation Guidelines

Mount the FLXA21 housing securely to a 2-inch vertical/horizontal pipe, wall surface, or panel cutout using the supplied UM mounting hardware kit.
Route signal and sensor cables through the bottom cable glands, maintaining a drip loop to prevent moisture ingress into the wiring enclosure.
Terminate the 2-wire 24 VDC loop cable to the main power/output terminals, ensuring proper polarity and connecting the cable shield to the internal chassis ground lug.
Wire sensor coaxial cables directly to the dedicated sensor interface terminal block, ensuring high-impedance pH signal lines remain clean and dry.
Torque the enclosure cover screws evenly to maintain the IP66 / NEMA 4X weatherproof seal, and calibrate the attached sensors using the front panel touch-screen interface prior to online operation.

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Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

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