Flowmax 400i EX Ultrasonic Flowmeter

In hazardous industrial environments, accurate flow monitoring must be combined with certified explosion protection. The Flowmax 400i EX is a high-performance ultrasonic flowmeter engineered for reliable, non-contact measurement of conductive and non-conductive liquids in ATEX-classified areas. Its chemically resistant construction and wear-free measuring principle ensure long-term operational stability.

Explosion-Proof Ultrasonic Flowmeter Technology

The Flowmax 400i EX utilises ultrasonic transit-time technology to measure volumetric flow without mechanical components inside the measuring tube. The smooth internal geometry prevents residue build-up and pressure loss, making the device suitable for both aggressive and high-purity media.

View the complete range of ultrasonic flowmeters supplied by RST Elektronik.

Core Advantages

• Non-contact ultrasonic measuring principle
• No moving parts – zero mechanical wear
• PFA wetted components for chemical resistance
• Integrated empty pipe detection
• Fast millisecond response time
• Configurable digital and analogue outputs
• Optional calibration with certificate

Technical Specifications

Mechanical Construction

• Wetted parts material: PFA
• Housing material: PP
• Union nut: PVDF or PFA
• Nominal diameters: DN7 / DN10 / DN15 / DN20
• Measurement ranges: 0.03–120 l/min depending on size
• Protection class: IP65
• Medium temperature: 0 … 50 °C
• Nominal pressure: PN6

Electrical Data

• Power supply: 24 VDC, approx. 3.6 W
• Electrical connection: 8-core cable

Inputs and Outputs

• 1 digital input (e.g. dosing start)
• 2 digital outputs configurable as pulse or alarm
• 1 analogue output configurable as 0/4–20 mA
• RS-485 communication interface

Measurement Performance

• Maximum error: ±2% of reading or ±0.15% of full scale
• Optional calibration: ±1% of reading
• Repeatability: ≤ 0.5%
• Reference standard: VDI/VDE 2642

ATEX & IECEx Certification

Zone 1

• IECEx Ex mb IIC T6 Gb
• ATEX II 2G Ex mb IIC T6 Gb

Zone 2

• ATEX II 3G Ex mc IIC T6 Gc

Industrial Applications

The Flowmax 400i EX ultrasonic flowmeter is designed for safe operation in:

• Chemical and petrochemical processing
• Solvent handling systems
• Corrosive liquid transfer lines
• Hazardous production areas
• Precision dosing installations

Why Choose RST Elektronik

RST Elektronik provides certified industrial measurement solutions supported by technical consultancy and application expertise. Our ultrasonic flowmeter range ensures reliable performance in both standard and explosion-proof environments.

Request a Quotation

Contact our technical team for detailed specifications, application support or pricing information for the Flowmax 400i EX ultrasonic flowmeter.