WIKA Alexander A2G-540 Differential Pressure Air Flow Controller TFT Display

Imagine trying to keep a large building comfortable while the air pressure keeps shifting, and you have no clear reading. The WIKA Alexander A2G-540 Differential Pressure Air Flow Controller TFT Display gives you instant, accurate pressure and flow data so you can act fast. It is built for ventilation, air-conditioning, and any system that moves air. If you have struggled with unreliable gauges or slow manual adjustments, this controller solves that problem with a bright display and smart outputs.

WIKA Alexander A2G-540 Differential Pressure Air Flow Controller TFT Display

The main issue in air handling is not knowing the exact pressure difference across filters or fans. Without that knowledge you waste energy, overload equipment, or let contaminants pass. This controller measures up to 12,000 Pa with 0.5 % full-scale accuracy, turning a vague guess into a reliable number. Its TFT colour screen shows pressure, flow, and velocity in the units you prefer, so you never have to convert or interpret cryptic codes. The built-in analog and digital outputs let you link the device to PLCs, building management systems, or simple relays, giving you full control over ventilation performance.

Usages of WIKA

You can install the unit in a commercial HVAC plant to balance supply and extract ducts, in a data-center cooling loop to keep servers at safe temperatures, or in a laboratory fume hood where precise airflow is required. It also works with EC ventilators and frequency converters in factories, and it can be added to any air-conditioning system that needs a reliable pressure reference for safety or energy saving.

Benefits

• Instant clear reading on a 2-inch colour screen.
• Accurate pressure measurement reduces energy waste.
• Easy wiring with spring-clip terminals saves installation time.
• Multiple analog and digital outputs fit any control system.
• Remote configuration via Modbus, LoRaWAN or NFC app.

Key Features

• Model A2G-540 with IP65 protection.
• Measures 12 000 Pa, 0.5 % FS accuracy.
• Temperature-compensated piezoresistive sensor.
• 2-inch TFT display, 240 320 dpi.
• Selectable pressure units: Pa, kPa, mbar, mmWC, inWC.
• Flow/velocity units: l/s, m/s, m/h, cfm, m/s, fpm.
• 1 or 2 relays, 24 V / 0.5 A.
• Up to 4 signal inputs (voltage, Pt1000, Ni1000, NTC).
• Analog outputs: 1 standard, 2 selectable (0-10 V, 0-5 V, 2-10 V, 4-20 mA).
• Digital interfaces: Modbus RTU (RS-485), LoRaWAN, NFC via WIKA app.
• Power 24 V 10 % AC/DC, 3.6 W consumption.
• Operating temperature -40 C to +60 C, humidity 5-95 % RH.

Specifications