# Allengra Flowmeters

> Allengra specializes in the design and production of ultrasonic flow sensors and control valves. Our core technology uses the time-of-flight principle to measure fluid flow non-invasively with high accuracy and virtually no pressure loss. We manage the entire development process from concept to serial production, with annual production capacity of up to one million sensors.

## Core Documentation
- [Home](https://allengra.eu/): The main landing page for Allengra.
- [About Us](https://allengra.eu/about-us): Company mission, manufacturing, and history.
- [Contact Us](https://allengra.eu/contact-us): Sales and support inquiries.
- [News](https://allengra.eu/news): Latest announcements and trade shows.

## Machine-Readable Pages
- [About Us](https://allengra.eu/about-us.md): Markdown version of https://allengra.eu/about-us
- [FAQ](https://allengra.eu/faq.md): Markdown version of https://allengra.eu/faq
- [ALSONIC Plastic DN15-DN50 Flowmeter](https://allengra.eu/products/alsonic-plastic-dn15-dn50-flow-sensor.md): Markdown version of https://allengra.eu/products/alsonic-plastic-dn15-dn50-flow-sensor
- [ALSONIC Brass DN15-DN50 Flowmeter](https://allengra.eu/products/alsonic-brass-dn15-dn50-flow-sensor.md): Markdown version of https://allengra.eu/products/alsonic-brass-dn15-dn50-flow-sensor
- [ALSONIC XL Flowmeter](https://allengra.eu/products/alsonic-xl-flow-sensor.md): Markdown version of https://allengra.eu/products/alsonic-xl-flow-sensor
- [Micro Flow Meter 2nd Gen](https://allengra.eu/products/micro-flow-meter-2nd-gen.md): Markdown version of https://allengra.eu/products/micro-flow-meter-2nd-gen
- [Micro Flow Meter](https://allengra.eu/products/micro-flow-meter.md): Markdown version of https://allengra.eu/products/micro-flow-meter
- [Automated Ceramic Disc Valve](https://allengra.eu/products/smart-valve.md): Markdown version of https://allengra.eu/products/smart-valve
- [Hydrogen Flow Meter](https://allengra.eu/products/hydrogen-flow-meter.md): Markdown version of https://allengra.eu/products/hydrogen-flow-meter
- [WSBK Fuel Flow Meter](https://allengra.eu/products/wsbk-fuel-flow-meter.md): Markdown version of https://allengra.eu/products/wsbk-fuel-flow-meter
- [PUM Fuel Flow Meter](https://allengra.eu/products/pum-fuel-flow-meter.md): Markdown version of https://allengra.eu/products/pum-fuel-flow-meter
- [Air Intake Flow Meter](https://allengra.eu/products/air-intake-flow-meter.md): Markdown version of https://allengra.eu/products/air-intake-flow-meter
- [R290 Safety Development Kit](https://allengra.eu/products/r290-safety-development-kit.md): Markdown version of https://allengra.eu/products/r290-safety-development-kit
- [ALSONIC Gas DN15-DN32](https://allengra.eu/products/alsonic-gas-dn15-dn32-flow-sensor.md): Markdown version of https://allengra.eu/products/alsonic-gas-dn15-dn32-flow-sensor
- [ALSONIC Stainless Steel DN15-DN20](https://allengra.eu/products/alsonic-stainless-steel-dn15-dn20-flow-meter.md): Markdown version of https://allengra.eu/products/alsonic-stainless-steel-dn15-dn20-flow-meter
- [ALSONIC High Temp](https://allengra.eu/products/alsonic-high-temp-flow-meter.md): Markdown version of https://allengra.eu/products/alsonic-high-temp-flow-meter
- [FIA Fuel Flow Meter](https://allengra.eu/products/fia-fuel-flow-meter.md): Markdown version of https://allengra.eu/products/fia-fuel-flow-meter

## Datasheets and Product Documents
- [ALSONIC Plastic DN15-DN50 Flowmeter - Datasheet](https://allengra.eu/products/documents/product_alsonic_plastic_dn15_dn50_flow_sensor_docs/ALSONIC-Plastic-DN15-DN50-Flowmeter-Datasheet.pdf?docName=doc0): 693.3 KB
- [ALSONIC Plastic DN15-DN50 Flowmeter - MODBUS Specifications](https://allengra.eu/products/documents/product_alsonic_plastic_dn15_dn50_flow_sensor_docs/ALSONIC-Plastic-DN15-DN50-Flowmeter-MODBUS-Specifications.pdf?docName=doc1): 430.7 KB
- [ALSONIC Plastic DN15-DN50 Flowmeter - FAQ](https://allengra.eu/products/documents/product_alsonic_plastic_dn15_dn50_flow_sensor_docs/ALSONIC-Plastic-DN15-DN50-Flowmeter-FAQ.pdf?docName=doc2): 870.3 KB
- [ALSONIC Brass DN15-DN50 Flowmeter - Datasheet](https://allengra.eu/products/documents/product_alsonic_brass_dn15_dn50_flow_sensor_docs/ALSONIC-Brass-DN15-DN50-Flowmeter-Datasheet.pdf?docName=doc0): 688.3 KB
- [ALSONIC Brass DN15-DN50 Flowmeter - MODBUS Specification](https://allengra.eu/products/documents/product_alsonic_brass_dn15_dn50_flow_sensor_docs/ALSONIC-Brass-DN15-DN50-Flowmeter-MODBUS-Specification.pdf?docName=doc1): 430.7 KB
- [ALSONIC Brass DN15-DN50 Flowmeter - FAQ](https://allengra.eu/products/documents/product_alsonic_brass_dn15_dn50_flow_sensor_docs/ALSONIC-Brass-DN15-DN50-Flowmeter-FAQ.pdf?docName=doc2): 870.3 KB
- [ALSONIC XL Flowmeter - ALSONIC Modbus Specification](https://allengra.eu/products/documents/product_alsonic_xl_flow_sensor_docs/ALSONIC-XL-Flowmeter-ALSONIC-Modbus-Specification.pdf?docName=doc0): 430.7 KB
- [Micro Flow Meter 2nd Gen - Datasheet](https://allengra.eu/products/documents/product_micro_flow_meter_2nd_gen_docs/Micro-Flow-Meter-2nd-Gen-Datasheet.pdf?docName=doc0): 422.4 KB
- [Micro Flow Meter 2nd Gen - Modbus Specification](https://allengra.eu/products/documents/product_micro_flow_meter_2nd_gen_docs/Micro-Flow-Meter-2nd-Gen-Modbus-Specification.pdf?docName=doc1): 506.5 KB
- [Micro Flow Meter 2nd Gen - I2C Specification](https://allengra.eu/products/documents/product_micro_flow_meter_2nd_gen_docs/Micro-Flow-Meter-2nd-Gen-I2C-Specification.pdf?docName=doc2): 554.3 KB
- [Micro Flow Meter - Datasheet](https://allengra.eu/products/documents/product_micro_flow_meter_docs/Micro-Flow-Meter-Datasheet.pdf?docName=doc0): 354.1 KB
- [Automated Ceramic Disc Valve - Datasheet](https://allengra.eu/products/documents/product_smart_valve_docs/Automated-Ceramic-Disc-Valve-Datasheet.pdf?docName=doc0): 485.3 KB
- [Hydrogen Flow Meter - Datasheet](https://allengra.eu/products/documents/product_hydrogen_flow_meter_docs/Hydrogen-Flow-Meter-Datasheet.pdf?docName=doc0): 673.8 KB
- [Hydrogen Flow Meter - MODBUS Specification](https://allengra.eu/products/documents/product_hydrogen_flow_meter_docs/Hydrogen-Flow-Meter-MODBUS-Specification.pdf?docName=doc1): 300.4 KB
- [Hydrogen Flow Meter - CANBUS Interface](https://allengra.eu/products/documents/product_hydrogen_flow_meter_docs/Hydrogen-Flow-Meter-CANBUS-Interface.zip?docName=doc2): 932 Bytes
- [WSBK Fuel Flow Meter - Datasheet](https://allengra.eu/products/documents/product_wsbk_fuel_flow_meter_docs/WSBK-Fuel-Flow-Meter-Datasheet.pdf?docName=doc0): 575.6 KB
- [PUM Fuel Flow Meter - Datasheet](https://allengra.eu/products/documents/product_pum_fuel_flow_meter_docs/PUM-Fuel-Flow-Meter-Datasheet.pdf?docName=doc0): 401.5 KB
- [Air Intake Flow Meter - Datasheet](https://allengra.eu/products/documents/product_air_intake_flow_meter_docs/Air-Intake-Flow-Meter-Datasheet.pdf?docName=doc0): 333.8 KB
- [R290 Safety Development Kit - Components](https://allengra.eu/products/documents/product_r290_safety_development_kit_docs/R290-Safety-Development-Kit-Components.pdf?docName=doc1): 125.8 KB
- [ALSONIC Gas DN15-DN32 - Datasheet](https://allengra.eu/products/documents/product_alsonic_gas_dn15_dn32_flow_sensor_docs/ALSONIC-Gas-DN15-DN32-Datasheet.pdf?docName=doc0): 500.3 KB
- [ALSONIC Stainless Steel DN15-DN20 - Datasheet](https://allengra.eu/products/documents/product_alsonic_stainless_steel_dn15_dn20_flow_meter_docs/ALSONIC-Stainless-Steel-DN15-DN20-Datasheet.pdf?docName=doc0): 719.3 KB
- [ALSONIC High Temp - Datasheet](https://allengra.eu/products/documents/product_alsonic_high_temp_flow_meter_docs/ALSONIC-High-Temp-Datasheet.pdf?docName=doc0): 1.7 MB
- [FIA Fuel Flow Meter - Datasheet](https://allengra.eu/products/documents/product_fia_fuel_flow_meter_docs/FIA-Fuel-Flow-Meter-Datasheet.pdf?docName=doc0): 517.5 KB

## Products

### ALSONIC Family
- [ALSONIC Plastic](https://allengra.eu/products/alsonic-plastic-dn15-dn50-flow-sensor): Modular ultrasonic flow sensor in high-end plastic, DN15-DN50, for HVAC/R and drinking water.
- [ALSONIC Brass](https://allengra.eu/products/alsonic-brass-dn15-dn50-flow-sensor): Modular ultrasonic flow sensor in brass housing for fresh water stations.
- [ALSONIC Stainless Steel](https://allengra.eu/products/alsonic-stainless-steel-dn15-dn20-flow-meter): Industrial and hygienic applications with precise liquid flow and temperature measurement.
- [ALSONIC High Temp](https://allengra.eu/products/alsonic-high-temp-flow-meter): Designed for temperatures up to 200°C with seal-free stainless steel body.
- [ALSONIC XL](https://allengra.eu/products/alsonic-xl-flow-sensor): Large industrial ultrasonic flow sensor with built-in temperature and pressure measurement.
- [ALSONIC Gas](https://allengra.eu/products/alsonic-gas-dn15-dn32-flow-sensor): Gas flow measurement for natural gas, nitrogen, and other gases, DN15-DN32

### Micro Flow Meters
- [Micro Flow Meter 2nd Gen](https://allengra.eu/products/micro-flow-meter-2nd-gen): Compact (<50g), ±1-2% accuracy, push-in fittings, ideal for coffee machines, dispensers, UAVs, drones.
- [Micro Flow Meter](https://allengra.eu/products/micro-flow-meter): Standard micro flow meter for precise dosing.

### Fuel Flow Meters
- [PUM Fuel Flow Meter](https://allengra.eu/products/pum-fuel-flow-meter): On-board fuel consumption monitoring for drones, bikes, vehicles, ±0.5% accuracy, OBFCM/WLTP compliant.
- [FIA Fuel Flow Meter](https://allengra.eu/products/fia-fuel-flow-meter): Official flow meter for FIA Formula 1 (2026-2030).
- [WSBK Homologated Flow Meter](https://allengra.eu/products): Championship-certified fuel flow meter for motorcycle racing.
- [Real-Time Fuel Injector Kit](https://allengra.eu/products/real-time-fuel-injector-visualization-and-correction-kit): For visualization and correction of injector flow.

### L-Type Flow Meters
- [L-Type Industrial Flow Meter](https://allengra.eu/products/l-type-industrial-flow-meter): Industrial-grade ultrasonic meter in PPS/brass, ±3% accuracy, 18-4500 l/h, for harsh environments and process control.
- [L-Type PW Flow Meter DSP](https://allengra.eu/products/l-type-pw-flow-meter-lcd-display): Brass ultrasonic meter with built-in LCD display, ±4% accuracy, 60-4000 l/h, for fresh water stations and potable water.
- [L-Type PW Flow Meter](https://allengra.eu/products/l-type-pw-flow-meter): Brass ultrasonic meter for potable water, ±3% accuracy, 10-2500 l/h, OEM connectors.
- [L-Type HVAC Flow Meter](https://allengra.eu/products/l-type-hvac-flow-meter): Lightweight plastic meter for HVAC/R systems, ±3% accuracy, 10-2500 l/h, UART output.
- [L-Type High Flow Meter](https://allengra.eu/products/l-type-high-flow-meter): High-capacity plastic meter with temperature, pressure, and heat metering, ±4% accuracy, 40-8600 l/h, Modbus output.

### Specialty Products
- [Hydrogen Flow Meter](https://allengra.eu/products/hydrogen-flow-meter): Ultrasonic sensor for H2 and hydrogen blends, provides mass flow, volume flow, and gas composition.
- [Air Intake Flow Meter](https://allengra.eu/products/air-intake-flow-meter): Plastic housing for dry/humid air flow in combustion engines and fuel cells.
- [Smart Valve](https://allengra.eu/products/smart-valve): Automated ceramic disc valve with integrated ultrasonic flowmeter, temperature, pressure, and PID control.
- [R290 Safety Kit](https://allengra.eu/products/r290-safety-development-kit): Heat exchanger leak detection for propane heat pumps using bubble detection.

## Industries Served

- [Heating & Heat Pumps](https://allengra.eu/industry/heating-flow-meters): Flow metering with heat energy calculation, R290 safety monitoring, glycol compensation.
- [Data Center Cooling](https://allengra.eu/industry/data-centers-cooling): Real-time thermal management and cooling system monitoring.
- [Drones & UAV](https://allengra.eu/industry/drones-flow-monitoring): Lightweight (<50g) fuel flow meters for fixed-wing, multirotor, and hybrid aircraft.
- [Motorsports](https://allengra.eu/industry/fuel-flow-meters): Official FIA supplier for Formula 1 (2026-2030), Formula E, WorldSBK, WEC.
- [Food & Beverages](https://allengra.eu/industry/food-and-beverages-flow-meters): Hygienic design for coffee machines (WMF partnership), dispensers, juicers.
- [Potable Water](https://allengra.eu/industry/potable-water): Lead-free, hygienic ultrasonic meters for drinking water applications.
- [Hydrogen & Clean Energy](https://allengra.eu/industry): PEM fuel cell optimization, electrolyzer monitoring, hydrogen mobility.
- [Cooling & Industrial](https://allengra.eu/industry): Plastic injection molding, automotive cooling, semiconductor manufacturing.

## Technology

Our ultrasonic flow measurement technology uses the time-of-flight principle:
- Transducer pairs emit and detect sound waves
- Flow rate calculated from upstream/downstream transit time difference
- Non-contact measurement suitable for virtually any fluid
- Features include gas bubble detection, high-speed temperature sensing, glycol concentration measurement
- Materials: High-end plastics, brass, stainless steel
- Temperature range: Up to 240°C (model dependent)
- Pressure range: Up to 6 bar standard, higher on request

## Trusted By

Major OEM partners include: Vaillant, Viessmann, Bürkert, WMF, Kärcher, Weishaupt

## Key differentiators:
- Non-intrusive ultrasonic measurement technology
- Sub-percent accuracy (±0.5% to ±2% depending on model)
- No moving parts for maintenance-free operation
- Integrated temperature and optional pressure measurement
- Gas bubble detection capability
- Glycol concentration measurement
- High-speed temperature response (T09 < 0.25 sec)
- Multiple communication interfaces: Modbus, CAN Bus, UART, LIN-Bus, I2C