Yokogawa FLXA21 | 2-Wire Dual Channel Transmitter/Analyzer

The Yokogawa FLXA21 is a 2-wire, dual-channel transmitter/analyzer designed for various types of liquid measurements, such as pH, ORP, conductivity, inductive conductivity, and dissolved oxygen. Here's a breakdown of its key features and specifications:

Key Features and Capabilities

• Dual Channel Measurement: The FLXA21 can accept two sensor modules, each capable of measuring one of the following:
  • pH/ORP
  • Conductivity (SC)
  • Inductive Conductivity (ISC)
  • Dissolved Oxygen (DO)
• Self-Diagnostics: The system continuously checks for issues like electrode contamination, damage, or low liquid levels, reducing maintenance costs.
• Wide Input and Output Ranges:
  • pH: -2 to 16 pH
  • ORP: -1500 to 1500 mV
  • Conductivity: 0 µS/cm to 200 mS/cm (depending on cell constant)
  • Dissolved Oxygen: 0 to 50 mg/L (ppm)

Accuracy and Performance

• pH Accuracy: ±0.01 pH
• ORP Accuracy: ±1 mV
• Temperature Accuracy: ±0.3 °C for most sensors
• Conductivity: ±0.5% F.S. for measurements from 2 µS/cm to 200 mS/cm
• Dissolved Oxygen: ±0.05 ppm or ±0.8% F.S., whichever is greater

Power Supply and Signal Output

• Loop Powered: Nominal 24 V DC, supports a wide range (16 to 40V DC for pH/ORP, SC, DO inputs; 17 to 40V DC for ISC)
• Output: 4-20 mA with HART digital communication
• Burnout Function: Allows detection of sensor failure or disconnection (e.g., 3.6 mA or 22 mA signals for different conditions)

Display and Interface

• LCD Touchscreen: Black and white, 213x160 pixels, with adjustable contrast.
• Multi-Language Support: Supports 12 languages, including English, Japanese, German, and Chinese.

Mechanical and Environmental Specifications

• Housing: Polycarbonate, IP66, NEMA Type 4X, and CSA Type 3S/4X certified.
• Mounting: Offers various mounting hardware options, including universal mounting kits, pipe and wall mounts, and panel mounts.
• Ambient Operating Temperature: -20 to +55°C
• Storage Temperature: -30 to +70°C
• Humidity: 10 to 90% RH at 40°C, non-condensing.

Digital Communication

• HART Protocol: Provides digital communication, enabling advanced diagnostics, configuration, and measurement data output.
• Calculated Data: The analyzer can also calculate and output data from both sensors (in dual-sensor configurations).

Model Breakdown (Suffix Codes)

The FLXA21's suffix codes define various configuration options such as power supply type, housing material, input types, and language set. Some examples include:

• Power Supply: Always -D (fixed configuration)
• Housing: -P (plastic)
• Inputs: -P1 for pH/ORP, -C1 for Conductivity, etc.
• Output: -A for 4-20 mA with HART
• Language Set: -LA for English and 11 additional languages

Optional Add-ons

• Mounting Hardware: /UM for universal mounting kit, /U for pipe/wall mount, /PM for panel mount.
• Hood Options: /H6, /H7, /H8 for stainless steel hoods with various coatings.
• Tag Plate: /SCT for stainless steel tag plates.
• Conduit Adapter: /CB4, /CD4, /CF4 for different thread types (G1/2, 1/2NPT, M20).

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