Yokogawa · Analytical & Liquid Analysis
FLXA402 Four-Wire Liquid Analyzer
Part number FLXA402-A-A-AA-A-P1-NN-A-N-LA-N-N-N-N
Four-wire, up to four-sensor liquid analyzer for pH/ORP, conductivity, dissolved oxygen and SENCOM digital sensors, 4–20 mA, Modbus.
- CE
- ATEX
- IECEx
- Modbus
Overview
The FLXA402 is the four-wire member of Yokogawa's FLEXA analyzer family. One transmitter can run up to four measurements from a mix of analog and SENCOM digital sensors — pH/ORP, contacting or inductive conductivity, dissolved oxygen and turbidity — which reduces the number of boxes on a water-treatment panel. The 5.7-inch touchscreen shows all loops at once, and Modbus TCP, EtherNet/IP and HART make the data available to SCADA. SENCOM sensors store calibration in the sensor head, so calibration can be done in the laboratory and the sensor exchanged in the field. The model code selects input modules, power supply and communication; we configure it against your measurement list.
Key features
- Up to four sensors on one transmitter: pH/ORP, conductivity (contacting/inductive), DO and turbidity
- SENCOM digital sensor support with laboratory calibration and field hot-swap
- Four 4–20 mA outputs, relays, HART, Modbus TCP/RTU and EtherNet/IP
- 5.7-inch colour touchscreen with multi-loop overview and trend display
- ATEX/IECEx Zone 2 and FM Class I Div 2 versions; 100–240 V AC or 24 V DC supply
Typical applications
- Water and wastewater treatment plants
- Boiler feedwater and cooling-tower chemistry
- Neutralisation and dosing control in chemical plants
- Food and pharmaceutical CIP monitoring
Technical specifications — FLXA402-A-A-AA-A-P1-NN-A-N-LA-N-N-N-N
| Measurement | |
|---|---|
| Parameters | pH/ORP, conductivity, inductive conductivity, DO, turbidity |
| Channels | Up to 4 (analog or SENCOM digital) |
| Accuracy | pH ±0.01 pH; conductivity ±0.5 % of reading |
| Output | |
| Analog | 4 × 4–20 mA |
| Digital | HART, Modbus TCP/RTU, EtherNet/IP |
| Relays | Up to 4 SPDT |
| Power | 100–240 V AC or 24 V DC |
| Process | |
| Sensor cable | Analog or SENCOM digital, up to 60 m |
| Display | 5.7-inch touchscreen |
| Environment | |
| Ambient temperature | -20…+55 °C |
| Enclosure | IP66/NEMA 4X, panel, pipe or wall mount |
Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.
Related part numbers and alternatives
| Part number | Relationship | |
|---|---|---|
FLXA202 | Two-wire loop-powered analyzer for single/dual measurements | Quote |
FLXA21 | Previous generation two-wire analyzer — being phased out | Quote |
Liquiline CM442 | Endress+Hauser Memosens alternative with two channels | Quote |
Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.
Supply, documentation and lead time
What you receive
- Genuine Yokogawa product in original packaging
- Commercial invoice and packing list; Certificate of Conformance on request
- Datasheet, declaration of conformity and country of origin as issued by the manufacturer
- Manufacturer warranty, period stated on the quotation
How we quote
- Reply within one business day with price, lead time and stock position
- Alternatives proposed when they improve price or delivery
- Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
- Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam
Indicative HS code 9027.80 — final classification is confirmed on the commercial invoice.
Frequently asked questions
How many measurements can one FLXA402 handle?
Up to four independent measurements, each with its own 4–20 mA output, from any mix of pH/ORP, conductivity, dissolved oxygen and turbidity sensors.
Do I need SENCOM sensors, or will my existing analog electrodes work?
Both work. Analog pH, conductivity and DO sensors connect to the analog input modules; SENCOM digital sensors add laboratory calibration and sensor-data storage. We help you mix the two during a staged upgrade.
Is the FLXA402 available from stock, and what is the lead time?
Typical factory lead time is 4–6 weeks depending on module configuration. We confirm with the quotation.