HNF00-A Mini Clamp-On Ultrasonic Flow Meter (Rigid Plastic Tubing)

Measure Low Flow Without Cutting the Tube

HNF00-A is made for equipment where the sensor must not touch the liquid. It clamps onto the outside of a rigid plastic tube and measures flow through the tube wall. There is no pipe cutting, no added pressure loss and no wetted measuring chamber.

This makes it a practical choice for ultrapure water, high-purity chemicals and hygienic liquid-transfer systems where contamination and dead volume must be kept out of the process.

Good fit: rigid plastic tubing, clean single liquids, limited installation space and OEM equipment requiring analogue or digital flow signals.

Is HNF00-A Suitable for Your Application?

Choose this model when:

• The tube is made from PFA, PTFE, PP, PU or resin

• The tube outside diameter is between 3 and 22 mm

• The expected liquid flow is between 0.05 and 80 L/min

• The liquid must remain isolated from the sensor

• The system needs flow measurement, totalization, bubble detection or filling control

• The signal must connect to a PLC, controller or equipment control board

Confirm the application with us before ordering when the tube is flexible, the liquid contains a large amount of gas or solids, or the tube size and flow range fall outside the specified limits. Calibration is matched to the tube material, tube size, liquid and operating temperature.

Why Use a Clamp-On Sensor Here?

No fluid contact

The sensor stays outside the tube. The measured liquid does not pass through a sensor body, reducing the risk of contamination in high-purity and hygienic systems.

No pipe cutting

Installation does not require an inline meter body. This simplifies equipment assembly and avoids adding fittings or dead corners to the liquid path.

Measurement and control in one sensor

HNF00-A supports bidirectional flow measurement, accumulated volume, bubble detection and configurable filling control. The electronics are integrated into the sensor body, so a separate transmitter is not required.

Built for OEM integration

Analogue, pulse and RS485 outputs allow the sensor to send flow data or control signals directly to equipment automation systems.

Technical Specifications

Installation and Configuration

Before production, confirm these four items:

1. Tube material and outside diameter — select the sensor size that matches the actual tube.

2. Liquid and operating temperature — these affect the calibration.

3. Normal and maximum flow — the expected operating point should remain inside the selected range.

4. Required output — specify pulse, analogue or RS485 according to the control system.

Mount the sensor on a clean and undamaged section of rigid tube. Avoid locations where the tube is sharply bent, compressed or exposed to strong mechanical vibration. After mounting, verify zero flow and compare the indicated flow with the equipment operating condition before starting automatic control.

Outputs and OEM System Integration

• 4–20 mA / 0–20 mA / 0–24 mA: continuous flow feedback to a PLC or controller.

• PNP / NPN pulse: totalization, filling counts or flow switching.

• RS485: digital flow monitoring and multi-sensor integration; up to 12 sensors can share one bus.

• Bubble detection: use the configured signal to alarm or stop a filling and transfer process when bubbles are detected.

For OEM projects, send us the controller input type, required flow unit and communication settings when requesting a quotation.

Typical Applications

Semiconductor ultrapure-water systems

Measures low liquid flow outside PFA or PTFE tubing without introducing metallic wetted parts into the process.

High-purity chemical transfer

Provides non-contact flow feedback for chemical delivery and dosing equipment where material compatibility and contamination control are important.

Biopharmaceutical processing

Suitable for rigid-tube sections used in filtration, chromatography, fermentation and other hygienic liquid-handling equipment.

Medical and laboratory equipment

Compact construction and multiple outputs support equipment requiring continuous flow monitoring, filling control or bubble detection.

Precision filling equipment

Combines flow measurement, totalization and bubble detection to support repeatable liquid dispensing and filling sequences.

What to Send Us for Selection

To confirm the correct HNF00-A configuration, provide: tube material, tube outside diameter, liquid name, operating temperature, normal and maximum flow rate, and the required output or communication interface. A sample tube and liquid information may be requested for application-specific calibration.

Frequently Asked Questions

Can it measure ultrapure water without touching the fluid?

Yes. HNF00-A clamps onto the outside of rigid plastic tubing, so the sensor does not contact the ultrapure water or become part of the wetted flow path.

Which rigid tube materials fit the clamp?

The supported materials include PFA, PTFE, PP, PU and resin tubing. Tube outside diameter must be between 3 and 22 mm. Confirm the exact material and size before ordering because calibration is application-specific.

Does it detect bubbles during filling?

Yes. Bubble detection and configurable filling control are integrated functions. The required alarm or control output should be specified when selecting the sensor.

How accurately can it measure ultra-low flow from 0.05 to 80 L/min?

The stated measurement accuracy is ±2% of reading, with repeatability of ±0.1% F.S., when the sensor is correctly matched and calibrated for the tube, liquid and temperature.

What outputs connect this compact sensor to an OEM control system?

Available interfaces include PNP/NPN pulse, 4–20 mA, 0–20 mA, 0–24 mA and RS485. Up to 12 sensors can be connected on one RS485 bus.

Selection Guide Download

HNF00-A Clamp-On Ultrasonic Flow Meter Datasheet (PDF)

Need Us to Check the Application?

Send the tube material, outside diameter, liquid, temperature, flow range and required output. We will confirm whether HNF00-A fits the application and recommend the correct calibration before quotation.

Send us your application details »