Acrylic Tube Rotameter for Air Flow meter, Range 0 to 0.40 SCFH, 4 MM ID Push Fit Connection SS at Rear Top & Bottom Inlet and outlet, Control Valve Provided at Inlet

Description

Precision Flow Measurement for Modern Industrial Applications

The “Ji” Japsin Instrumentation Acrylic Tube Rotameter is a high-accuracy, durable, and easy-to-install variable area flowmeter designed for low flow measurement of air, with a calibrated range of 0 to 0.40 SCFH. Engineered for precise monitoring of air supply in laboratory processes, R&D setups, pilot plants, OEM machinery, and industrial applications, this rotameter offers exceptional repeatability, clarity, and long-term reliability.

Manufactured by Japsin Instrumentation, a trusted Indian brand in process control instrumentation, this flowmeter combines premium acrylic material, SS rear connections, and a smooth control valve to give operators fast and accurate flow adjustment. Whether you are monitoring purge air, inert gas, small burners, sample air lines, or instrumentation systems, this rotameter provides dependable performance with minimal maintenance.

Designed for continuous operation, low-pressure applications, and precise small-scale gas flow measurement, this model is ideal for engineers, instrumentation technicians, and industrial OEMs looking for a robust, compact, and economical solution.

2. Why Choose a Japsin Acrylic Tube Rotameter?

Japsin’s acrylic rotameters are known for:

• Crystal-clear readability

• Stable flow indication

• Low-pressure drop design

• Rugged one-piece molded acrylic body

• Precision machined internals

• ISO-standard calibration

This particular model (0–0.40 SCFH for air) is optimized for very low flow ranges, making it suitable for applications where accuracy is critical and even minor variations may affect process efficiency.

3. Key Features & Benefits

3.1 High Accuracy for Low Flow Applications

The calibrated range of 0–0.40 SCFH of air ensures precise indication for micro-flow and small gas streams used in laboratories and instrumentation systems.

3.2 One-Piece Clear Acrylic Body

Made from optical-grade acrylic, the rotameter offers excellent visibility of the float position and eliminates the risk of breakage seen in glass tube flowmeters.

3.3 Stainless Steel Rear Inlet & Outlet Connections

The SS connections located at the rear top and bottom offer:

• Better panel mounting flexibility

• Enhanced corrosion resistance

• Clean flow path for instrumentation gases

3.4 Smooth, Integrated Control Valve

Ensures accurate flow adjustment, fine control, and stable readings even at minimal flows.

3.5 Compact & Lightweight

Ideal for portable systems, analytical instruments, and space-restricted control panels.

3.6 Chemical & Corrosion-Resistant

Safe for use with air, inert gases, calibration gases, and dry gas mixtures.

3.7 Easy to Install & Maintain

The push-fit connection (4 mm ID) simplifies tube installation and prevents leakage.

4. Understanding the Working Principle

This rotameter works on the variable area flow measurement principle:

1. Air enters through the bottom stainless-steel inlet.

2. The internal float rises proportionally to the flow rate.

3. The clearance between the float and the tapered acrylic tube creates a variable area.

4. As flow increases, the float moves upward to a larger area until equilibrium is reached.

5. The position of the float against the engraved scale gives the instantaneous flow rate.

This simple yet reliable measuring system ensures:

• No external power

• Quick visual indication

• High repeatability

• Long service life

5. Where Can This Rotameter Be Used? – Applications Across Industries

The Acrylic Tube Rotameter with 0–0.40 SCFH air range is specifically designed for low flow applications, making it ideal for:

5.1 Laboratory Air Flow Measurement

Used in research setups, gas chromatography, sampling, and experimental projects requiring accurate micro-flow air measurement.

5.2 R&D and Analytical Equipment

Perfect for controlled air purge, gas dilution systems, and testing rigs.

5.3 Environmental & Pollution Monitoring Instruments

Used in devices that require a fixed small flow rate of air or inert gases.

5.4 OEM Machinery & Process Equipment

Embedded in machines that regulate small quantities of air for internal components or sensors.

5.5 HVAC & Clean Air Monitoring Systems

Ensures stable gas flow in sampling lines and clean room instrumentation.

5.6 Purge Air Measurement

Ideal for monitoring air purge in instrumentation enclosures, control panels, or analyzers.

5.7 Educational Laboratories

Engineering institutions use these rotameters for fluid mechanics and gas flow experiments.

6. Installation Guide (Step-by-Step)

Step 1: Prepare the Tube Connections

Use standard 4 mm ID tubing compatible with push-fit connectors.

Step 2: Mount the Rotameter Vertically

The meter must be installed vertically with flow direction bottom to top.

Step 3: Secure Using Rear/Panel Mount Slots

Tighten the bolts but avoid over-tightening, which could stress the acrylic body.

Step 4: Connect the Air Inlet (Bottom)

Push the tube firmly into the SS fitting until it locks.

Step 5: Connect the Outlet (Top)

Ensure equal alignment for smooth flow.

Step 6: Start the Flow Slowly

Gradually open the control valve and allow the float to stabilize.

Step 7: Read the Flow Rate

Note the float’s center point aligned with the engraved scale.

7. Maintenance Guidelines

The acrylic rotameter requires minimal maintenance. Follow these best practices:

• Use only clean, dry air for long-term accuracy.

• Prevent exposure to harsh chemicals not compatible with acrylic.

• Avoid scratch-causing abrasives while cleaning.

• Use a mild soap solution and a soft cloth for cleaning the acrylic body.

• Regularly inspect connections for leaks.

Because the body is solid acrylic, it resists moisture, corrosion, and discoloration over time.

8. Buyer’s Guide – Choosing the Right Rotameter

When selecting a rotameter for air flow measurement, consider:

8.1 Flow Range

This model is suitable for very low air flows (0–0.40 SCFH).
Ideal for precise applications requiring micro-flow accuracy.

8.2 Connection Type

4 mm ID push-fit ensures fast tube installation.

8.3 Material Compatibility

Acrylic is excellent for clean air, dry gas, and inert gas applications.

8.4 Mounting Orientation

Rear SS connections support neat, flush panel integration.

8.5 Valve Requirement

Comes with an integrated fine-control valve, eliminating the need for external regulators.

This rotameter is engineered for users who prioritize accuracy, durability, affordability, and ease of installation.

Conclusion: Your Trusted Choice for Low Flow Air Measurement

The Japsin Instrumentation Acrylic Tube Rotameter (0–0.40 SCFH, Air) is the perfect combination of:

• Accuracy

• Durability

• Clarity

• User-friendly installation

• Industrial-grade reliability

Whether you’re designing laboratory equipment, monitoring purge air, or integrating a flowmeter in OEM machinery, this flowmeter ensures precise flow control, stable indication, and long-term value.

Japsin Instrumentation – Since 1974