Description
Product Overview
The Yokogawa FLXA402 is a modular multi-channel 4-wire liquid analyzer within the OpreX FLEXA series, engineered for continuous on-line water and process liquid quality monitoring. It accepts both conventional analog sensors and SENCOM 4.0 digital smart sensors. When paired with SA11 SENCOM smart adapters and BA11 junction box, the FLXA402 can support up to five sensors on a single transmitter unit. Measurable parameters include pH/ORP, contacting conductivity (SC), inductive conductivity (ISC), dissolved oxygen (DO), resistivity, percent concentration, plus auxiliary 4–20mA input signals. It features a full-color touchscreen HMI with 9 selectable languages, SD card data logging, Bluetooth local configuration, HART7, RS485 Modbus RTU and Ethernet Modbus TCP communications. Built-in sensor self-diagnostics detect electrode fouling, damage and drift for predictive maintenance. Widely deployed in water & wastewater, power plants, chemical, pharmaceutical and food & beverage industries, stocked as drop-in spare for liquid analytical measurement loops.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | FLXA402 |
| Manufacturer | Yokogawa Electric Corporation (Japan) |
| Product Type | Multi-Parameter 4-Wire Liquid Analyzer / Transmitter |
| Supported Measurements | pH/ORP, Contacting Conductivity (SC), Inductive Conductivity (ISC), Dissolved Oxygen (DO), Resistivity, % Concentration, 4–20mA auxiliary input |
| Max Sensor Capacity | Up to 5 sensors with SA11 SENCOM adapters; max 2 analog sensors without SENCOM |
| Display | Color TFT touchscreen HMI, 9 selectable languages |
| Analog Outputs | Up to 4 isolated 4–20mA channels |
| Digital Communication | HART7, Modbus RTU (RS485), Modbus TCP (Ethernet), Bluetooth, SD card data logging |
| Power Supply | 90–264 VAC, 50/60Hz (max 35VA) / 10.8–26.4 VDC (max15W) |
| Enclosure | Die-cast aluminum housing, IP66 / NEMA 4X |
| Diagnostics | Sensor impedance monitoring, electrode contamination alert, internal self-test, predictive maintenance notifications |
| Mounting Options | Wall mount, pipe mount |
| Operating Temperature | -20°C ~ +60°C |
| Storage Temperature | -40°C ~ +85°C |
| Relative Humidity | 5% ~95% non-condensing |
| Approximate Weight | 1.8 kg |
Compliance & Certifications
- CE mark compliant with EMC and Low Voltage Directive
- RoHS compliant
- Optional ATEX / IECEx hazardous area certification for explosion-proof configurations
- Factory calibration and full functional performance test prior to shipment
Storage & Installation Guidelines
Storage Requirements
- Store in dry temperature-controlled warehouse; recommended ambient 10°C ~30°C, RH <70% non-condensing
- Remain sealed inside original packaging before installation
- Protect from mechanical shock, continuous vibration, dust and corrosive vapors
- ESD wristband required when opening enclosure and handling internal components
Installation Instructions
- Execute lock-out/tag-out procedures for process lines and power supply before installation
- Wear ESD protective gear to prevent electrostatic damage to circuit boards
- Mount analyzer on solid wall or pipe; avoid direct sunlight and high vibration locations
- Separate sensor cables, 4–20mA signal wiring and communication cables from high-voltage power wiring
- Connect pH, conductivity or DO sensors, SA11 SENCOM adapters and BA11 junction box for multi-sensor setups
- Apply power, configure sensor type, measurement ranges and calibration parameters via touchscreen or Bluetooth FieldMate software
- Complete sensor calibration, validate measurement readings and test analog/digital communication outputs
- Commissioning must be performed by certified Yokogawa analytical instrument technicians
FAQ
Q: What parameters can Yokogawa FLXA402 measure? A: It supports pH, ORP, contacting conductivity, inductive conductivity, dissolved oxygen, resistivity and percent concentration measurement.
Q: How many sensors can FLXA402 support? A: Up to five sensors when using SA11 SENCOM digital adapters and BA11 junction box; maximum two analog sensors without SENCOM.
Q: What communication protocols are available on FLXA402? A: HART7, Modbus RTU over RS485, Modbus TCP over Ethernet, plus Bluetooth for local handheld configuration.
Q: Is FLXA402 suitable for outdoor installation? A: Standard unit features IP66 / NEMA4X aluminum enclosure for outdoor mounting; explosion-proof certification is available for hazardous classified process areas.
Q: What warranty is available? A: Standard 12-month warranty applies for fully tested analyzers operated under rated normal operating service conditions.
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