Description
Plastic Threaded Rotameter for Water – 500 to 7500 LPH
The Plastic Threaded Rotameter for Water, Range 500 to 7500 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 measuring range of 500 to 7500 Litres Per Hour (LPH), this rotameter is suitable for applications where accurate and convenient local flow indication is required for medium- to higher-flow water circuits.
The instrument is specifically designed for water with a specific gravity of 1 and features a transparent polycarbonate body, SS 316L float, and ABS end construction. These materials provide a lightweight, corrosion-resistant, and easy-to-inspect construction suitable for a variety of compatible water-flow applications.
The rotameter is supplied with 1 1/2″ BSP (M) threaded connections at both the top and bottom, making it suitable for inline installation in compatible piping systems. The standard flow arrangement is bottom inlet and top outlet, allowing the water to flow upward through the measuring section.
As water passes through the instrument, the float moves according to the flow rate. The operator can observe the float through the transparent body and determine the approximate flow from the graduated scale.
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 a straightforward solution for general-purpose water-flow monitoring.
Variable-Area Flow Measurement Principle
The Plastic Threaded Rotameter operates according to the proven variable-area flow measurement principle.
Water enters through the lower connection and flows upward through the tapered measuring section. The upward flow causes the float to rise. As the water flow increases, the float moves higher; as the flow decreases, the float moves lower.
When the flow becomes stable, the float settles at a position corresponding to the flow rate. The operator reads this position against the graduated scale to determine the water flow.
This simple mechanical principle offers several important benefits:
- Direct visual flow indication
- Continuous flow monitoring
- No external electrical power required
- Simple operation
- Easy visual inspection
- Low-maintenance construction
- Economical installation
- Convenient troubleshooting
The instrument is therefore well suited to applications where a simple local flow indication is preferred over more complex electronic flow measurement systems.
500 to 7500 LPH Flow Range
The instrument is designed for a flow range of:
500 to 7500 LPH
This wide range allows the rotameter to be used in various water-flow applications where higher flow capacity is required.
The graduated scale enables operators to monitor changes in flow and identify whether the process is operating within the desired range.
Potential applications include:
- Water treatment plants
- RO and water purification systems
- Cooling-water circuits
- Industrial filtration systems
- Process-water circulation
- Industrial machinery
- Utility-water systems
- Washing and cleaning systems
- Water circulation equipment
- Process equipment
- Industrial water distribution systems
The rotameter should be selected and operated according to the actual process conditions and specified operating limits.
Transparent Polycarbonate Body
The measuring body is manufactured from polycarbonate, providing a transparent section through which the float can be observed during operation.
This transparent construction is one of the key advantages of the instrument because the operator can directly see the float position without requiring an electronic display.
Visual observation can assist in:
- Confirming the presence of water flow
- Monitoring flow changes
- Checking float movement
- Identifying unstable flow conditions
- Detecting unexpected flow reduction
- Performing routine inspections
The polycarbonate body also contributes to the lightweight and economical construction of the rotameter.
The instrument should always be operated within its specified pressure and temperature ratings.
SS 316L Float
The rotameter is equipped with an SS 316L float, which is the primary moving element used for flow indication.
The float responds to the upward force generated by the flowing water. Its position changes according to variations in flow rate.
SS 316L is widely used in industrial instrumentation because of its corrosion-resistant characteristics and suitability for many water and process applications.
The use of an SS 316L float provides a durable measuring element for compatible operating conditions.
1 1/2″ BSP (M) Threaded Connections
This model is supplied with:
1 1/2″ BSP (M) connections at the top and bottom
These threaded connections are intended for inline installation into compatible piping systems.
The standard flow arrangement is:
Bottom Inlet → Measuring Section → Top Outlet
Correct orientation is essential for proper operation because the float is designed to move vertically under the combined influence of fluid flow and gravity.
Before installation, users should verify that the piping and fittings are compatible with the 1 1/2″ BSP male threaded connections.
Designed for Water – Specific Gravity 1
The rotameter is specified for:
Water – Specific Gravity 1
The flow scale is intended for water having the specified density characteristics. If the instrument is used with another liquid having different density or viscosity, the indicated flow may not correspond directly to the water calibration.
For this reason, the product should be used for its intended water application unless suitable application-specific calibration or correction is available.
Maximum Operating Temperature – 60°C
The specified maximum operating temperature is:
60°C
This makes the rotameter suitable for many normal and moderately warm water applications.
Before installation, the operating temperature of the water system should be checked to ensure it remains within the specified limit.
The instrument should not be exposed to process temperatures above the rated maximum.
Maximum Operating Pressure – 5 kg/cm²
The maximum specified operating pressure is:
5 kg/cm²
The process system should be evaluated to ensure that normal operating pressure remains within this limit.
Pressure fluctuations and sudden pressure surges should also be considered during system design and installation.
Proper piping support should be provided to minimize mechanical stress on the instrument and its threaded connections.
2% Full-Scale Accuracy
The specified accuracy of the rotameter is:
2% of Full Scale
This makes the instrument suitable for many general-purpose flow-monitoring applications.
The product is particularly useful when the purpose of flow measurement is to continuously observe and maintain process flow rather than perform high-precision laboratory measurement.
For applications with stringent measurement requirements, users should evaluate the stated accuracy against their specific process and calibration requirements.
Tamper-Proof Scale Sticker
The instrument is supplied with a tamper-proof scale sticker for flow indication.
The scale is graduated in:
LPH / LPM
The operator can observe the float position and compare it against the corresponding scale marking.
The scale provides a convenient local reference for monitoring water-flow conditions.
For consistent readings, the operator should follow the recommended float-reading position and allow the flow to stabilize before taking a measurement.
Dimensions
The approximate dimensions of this model are:
400 mm Height × 120 mm Width
The relatively large measuring body is suitable for the instrument’s higher 500–7500 LPH flow range.
Adequate installation clearance should be provided around the rotameter to allow easy visual observation, inspection, and maintenance.
Industrial Applications
1. Water Treatment
The rotameter can be used to monitor water flow through compatible treatment, filtration, and circulation systems.
2. RO and Purification Plants
It can provide local flow indication in suitable reverse-osmosis and water-purification systems.
3. Cooling-Water Systems
Industrial machinery often requires continuous cooling-water flow. The rotameter can be used to monitor compatible cooling circuits.
4.Filtration Systems
The instrument can help operators observe water flow through suitable filtration equipment.
5.Industrial Process Systems
The 500–7500 LPH range makes this model suitable for various process-water applications requiring local flow indication.
6. Utility Water Lines
It can be installed in suitable industrial utility-water systems for continuous visual flow monitoring.
7. Industrial Machinery
The instrument can monitor water used for cooling, cleaning, circulation, or other compatible process applications.
Key Features and Benefits
- Plastic threaded rotameter
- Designed specifically for water
- Flow range 500 to 7500 LPH
- Water specific gravity: 1
- Accuracy: 2% of Full Scale
- Transparent polycarbonate body
- SS 316L float
- ABS end material
- 1 1/2″ BSP (M) threaded connections
- Top and bottom connections
- Bottom inlet and top outlet
- Inline installation
- Maximum operating temperature: 60°C
- Maximum operating pressure: 5 kg/cm²
- LPH/LPM scale graduation
- Tamper-proof scale sticker
- Approximate dimensions: 400 H × 120 W mm
- Direct visual indication
- No external power required for basic mechanical indication
- Simple variable-area operating principle
- Economical construction
- Suitable for industrial and utility water-flow monitoring
Why Choose This Plastic Threaded Rotameter?
The Plastic Threaded Rotameter 500–7500 LPH provides a simple and economical method for monitoring relatively high water-flow rates without the complexity of an electronic flow transmitter.
Its transparent polycarbonate body allows the operator to directly observe the SS 316L float, while the graduated scale provides a convenient reference for determining flow. The 1 1/2″ BSP (M) connections allow installation into compatible water piping arrangements.
The instrument is especially useful for users looking for continuous local flow indication, simple operation, easy inspection, low maintenance, and economical instrumentation.
The combination of a wide flow range, transparent construction, durable SS 316L float, plastic end components, and direct visual indication makes this rotameter a practical choice for a variety of water-flow monitoring applications.
Installation Guidelines
For proper operation, the rotameter should be installed in a vertical position with the inlet at the bottom and outlet at the top.
Before commissioning, ensure that:
- The piping system is compatible with the 1 1/2″ BSP (M) connections.
- The instrument is installed vertically.
- The flow direction is bottom to top.
- Operating flow remains within 500–7500 LPH.
- Operating pressure does not exceed 5 kg/cm².
- Operating water temperature does not exceed 60°C.
- Piping is properly aligned and supported.
- The float is able to move freely.
- Excessive vibration and pressure surges are avoided.
- Flow is allowed to stabilize before reading the scale.
Maintenance
The rotameter has a straightforward mechanical construction and requires relatively simple routine inspection. Periodically check the transparent body, float movement, scale, threaded connections, and overall condition of the instrument.
If deposits or contaminants affect float movement, the instrument should be safely isolated from the process before cleaning or servicing.
Regular inspection can help identify abnormal float movement, deposits, physical damage, or connection-related issues before they affect normal operation.
Conclusion
The Plastic Threaded Rotameter for Water, 500 to 7500 LPH is a practical, economical, and easy-to-use instrument for continuous local water-flow measurement. Its variable-area operating principle, transparent polycarbonate body, SS 316L float, ABS end construction, 1 1/2″ BSP (M) connections, and direct visual indication provide a useful combination of simplicity and functionality.
With a 500–7500 LPH flow range, 2% full-scale accuracy, maximum operating temperature of 60°C, and maximum operating pressure of 5 kg/cm², the rotameter is suitable for compatible water-treatment, cooling, filtration, process, and utility applications.
For industries and equipment manufacturers requiring a simple, visible, economical, and low-maintenance water-flow monitoring solution, this Plastic Threaded Rotameter offers an effective option for routine process and utility flow indication.
Japsin Instrumentation – Since 1974
Nikhil Sharma –
Top-notch Quality and Reliable Performance!
Ikshan Choudhury –
Excellent investment, reliable performance!
Oviya Kapoor –
Nice Product