Plastic Threaded Rotameter for Water – 300 to 3000 LPH

Description

Plastic Threaded Rotameter for Water – 300 to 3000 LPH

The Plastic Threaded Rotameter for Water, Range 300 to 3000 LPH is a practical, economical, and reliable variable-area flow measuring instrument designed for continuous visual monitoring of water flow in industrial, commercial, process, utility, and water-treatment applications. With a wide flow range of 300 to 3000 Litres Per Hour (LPH), this rotameter is suitable for applications requiring higher water-flow measurement while maintaining a simple and easy-to-read mechanical indication system.

The instrument is designed specifically for water with a specific gravity of 1 and incorporates a transparent polycarbonate body, SS 316L float, and ABS end connections. The construction provides a combination of visibility, lightweight design, corrosion resistance, and economical operation. The rotameter is supplied with 3/4-inch BSP (M) threaded connections at both the top and bottom, allowing it to be installed directly into compatible piping arrangements.

The standard flow configuration is bottom inlet and top outlet, allowing the water to flow vertically upward through the measuring tube. As water passes through the flow passage, the SS 316L float moves according to the flow rate. The operator can observe the float position against the graduated scale and determine the approximate water flow directly.

With a specified accuracy of 2% of full scale, maximum operating temperature of 60°C, and maximum operating pressure of 5 kg/cm², this plastic threaded rotameter provides an effective solution for general-purpose water-flow monitoring within its specified operating conditions.

Variable-Area Flow Measurement Principle

The rotameter operates according to the variable-area principle, one of the most widely used methods for local flow indication.

Water enters through the lower connection and moves upward through the tapered measuring section. As the flow increases, the float rises. When the flow decreases, the float moves downward. At a stable flow rate, the float reaches a position where the forces acting on it are balanced.

The position of the float corresponds to the flow rate shown on the graduated scale.

This simple operating principle provides several benefits:

• Direct visual flow indication
• No external electrical power required
• Continuous monitoring
• Simple operation
• Easy inspection
• Low maintenance
• Economical installation
• Reliable mechanical measurement

The operator can therefore monitor water flow without relying on a digital display or separate electrical measurement system.

300 to 3000 LPH Flow Range

This model is designed for a water-flow range of:

300 to 3000 LPH

The relatively wide measuring range makes the instrument suitable for many medium-flow water applications.

The scale can be used for direct visual monitoring of flow conditions, helping operators identify whether the process is operating within the desired flow range.

Potential applications include:

• Water treatment systems
• RO plants
• Cooling-water circuits
• Filtration systems
• Industrial machinery
• Process equipment
• Utility-water lines
• Water circulation systems
• Industrial washing systems
• Laboratory and testing equipment
• General process-water monitoring

The instrument should be selected according to the actual operating flow and the characteristics of the water system.

Polycarbonate Body

The flow body is manufactured from polycarbonate, providing a transparent measuring section through which the float can be observed.

The transparent body is particularly useful because it allows operators to visually inspect the float position while the system is operating. This can assist with routine flow monitoring and troubleshooting.

Polycarbonate construction also contributes to the instrument’s lightweight and compact design.

The transparent measuring section can help operators identify:

• Presence of flow
• Changes in flow rate
• Float movement
• Unstable flow conditions
• Unexpected flow reduction
• Possible measurement abnormalities

The body should be operated within the specified temperature and pressure limits.

SS 316L Float

The instrument is fitted with an SS 316L float.

The float is the primary moving component of the rotameter and responds to changes in water flow. As the water flow increases or decreases, the float changes position inside the measuring section.

SS 316L is widely used for instrumentation components because of its corrosion-resistant characteristics and suitability for various industrial environments.

The use of an SS 316L float provides a robust measuring element for compatible water applications.

3/4-Inch BSP Threaded Connections

The rotameter is provided with:

3/4-inch BSP (M) connections at top and bottom

These threaded connections are designed for inline installation into compatible piping systems.

The standard arrangement is:

Bottom Inlet → Flow Through Measuring Tube → Top Outlet

Correct installation orientation is important because the float relies on gravity and upward fluid movement for proper operation.

Before installation, the piping arrangement should be checked to ensure compatibility with the 3/4-inch BSP male connections.

Water Application – Specific Gravity 1

The rotameter is calibrated for:

Water – Specific Gravity 1

Flow readings are based on the specified fluid characteristics. If the instrument is used with a liquid having substantially different density or viscosity, the indicated flow may not correspond directly to the calibrated water scale.

For this reason, the instrument should primarily be used for the intended water application unless a suitable recalibration or application-specific correction is available.

Operating Temperature

The maximum specified operating temperature is:

60°C

This makes the instrument suitable for many ambient and moderately warm water applications.

The process temperature should be checked before installation to ensure it remains within the specified limit.

Applications involving higher temperatures should not be operated beyond the rated limit of the instrument.

Operating Pressure

The maximum specified operating pressure is:

5 kg/cm²

The complete water system should be evaluated for normal operating pressure as well as potential pressure fluctuations or surges.

The specified pressure limit should not be exceeded.

Proper piping supports and installation practices should be used to avoid mechanical stress on the instrument.

2% Full-Scale Accuracy

The specified accuracy is:

2% of Full Scale

This makes the rotameter suitable for many general-purpose flow monitoring applications where a straightforward local indication is required.

The instrument is particularly useful where the primary objective is to monitor and maintain an appropriate operating flow rather than perform laboratory-grade precision flow measurement.

Tamper-Proof Scale Sticker

The instrument is supplied with a tamper-proof scale sticker.

The graduated scale provides the reference for reading the flow rate based on the float position.

The scale graduation is specified as:

LPH / LPM

This allows the instrument to be used for convenient flow indication according to the supplied calibration scale.

The operator should read the float consistently at the appropriate reference position according to the instrument’s calibration instructions..

Compact Industrial Design

The approximate dimensions of this model are:

255 mm Height × 80 mm Width

Despite its larger flow capacity, the instrument retains a practical plastic construction suitable for many industrial installations.

The compact form factor makes it useful where users require a local flow indicator without installing a large metallic flow-meter assembly.

Applications

1. Water Treatment

The rotameter can be used to monitor water flow through compatible filtration and treatment equipment.

2. RO Plants

It can provide local flow indication in suitable reverse-osmosis and purification systems.

3. Cooling Systems

The instrument can be installed on suitable cooling-water circuits to help operators monitor water circulation.

4. Industrial Machinery

Water used for cooling, washing, or process purposes can be monitored using the rotameter.

5. Process Equipment

Suitable process equipment can incorporate the instrument to provide continuous local flow indication.

6.Utility Water Lines

The 300–3000 LPH range makes the model suitable for a variety of industrial utility-water applications.

7. Filtration Systems

It can be used to observe flow through compatible filtration equipment and water-processing systems.

Why Choose This Plastic Threaded Rotameter?

The Plastic Threaded Rotameter 300–3000 LPH provides an economical and straightforward solution for monitoring water flow in systems where direct visual indication is preferred.

Its transparent polycarbonate body allows the operator to observe the SS 316L float, while the graduated scale provides a convenient reference for determining flow. The 3/4-inch BSP (M) connections make it suitable for compatible inline piping arrangements.

The instrument is particularly valuable for users who need a simple mechanical flow indicator without the installation complexity associated with electronic flow transmitters.

Its combination of wide flow range, transparent body, SS 316L float, compact design, economical construction, and simple variable-area operation makes it suitable for numerous water-flow applications.

Installation Guidelines

For proper operation, the rotameter should be installed vertically with the inlet at the bottom and outlet at the top. The measuring section should remain properly aligned so that the float can move freely.

Before installation, verify that the system is compatible with the 3/4-inch BSP (M) connections and that the process conditions remain within the specified pressure and temperature limits.

Conclusion

The Plastic Threaded Rotameter for Water, 300 to 3000 LPH is a compact and economical flow-measurement solution designed for reliable local monitoring of water flow. Its variable-area operating principle, transparent polycarbonate body, SS 316L float, ABS end construction, and 3/4-inch BSP (M) threaded connections provide a practical combination of visibility, simplicity, and ease of installation.

With a 300–3000 LPH measuring range, 2% full-scale accuracy, maximum operating temperature of 60°C, and maximum operating pressure of 5 kg/cm², this rotameter is suitable for a wide variety of general-purpose water applications.

It can be used in water-treatment systems, RO plants, cooling-water circuits, filtration equipment, industrial machinery, process systems, and utility-water lines where a direct and economical flow indication method is required.

For industrial users seeking a simple, visible, low-maintenance, and cost-effective water-flow monitoring instrument, this plastic threaded rotameter offers a practical solution for everyday process and utility applications.

Japsin Instrumentation – Since 1974