Description
Plastic Threaded Rotameter for Water – 3000 to 30000 LPH
The Plastic Threaded Rotameter for Water, Range 3000 to 30000 LPH is a high-capacity variable-area flow measurement instrument designed for continuous and reliable visual monitoring of water flow in industrial, commercial, process, utility, and water-treatment applications. With a wide flow range of 3000 to 30000 Litres Per Hour (LPH), this rotameter is suitable for high-volume water-flow applications where simple, direct, and economical flow indication is required.
The instrument is specifically designed for water with a specific gravity of 1 and incorporates a transparent polycarbonate measuring body, SS 316L float, and ABS end material. Its transparent construction allows operators to observe the position of the float directly during operation, making it possible to monitor the water-flow condition without requiring electrical power or a separate digital display.
The rotameter is provided with 2″ BSP (F) connections at both the top and bottom, making it suitable for inline installation with compatible piping and fittings. The recommended flow arrangement is bottom inlet and top outlet. This vertical flow direction is important for correct float movement and accurate visual indication.
The instrument operates on the well-established variable-area flow measurement principle. As water enters through the bottom connection, the upward flow causes the SS 316L float to move upward inside the measuring section. As the flow rate increases, the float rises; as the flow rate decreases, the float moves downward. When the flow becomes stable, the float settles at a corresponding position on the graduated scale, allowing the operator to determine the approximate water-flow rate.
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 practical solution for general-purpose high-flow water monitoring within its specified operating conditions.
Variable-Area Flow Measurement Principle
The Plastic Threaded Rotameter uses the variable-area principle to indicate water flow.
Water enters the measuring tube from the bottom and flows upward. The upward force generated by the moving water lifts the float. The float rises until the forces acting on it reach equilibrium.
Each stabilized float position corresponds to a particular flow rate. The operator reads the float position against the scale provided on the instrument.
This operating principle provides:
- Direct visual flow indication
- Continuous flow monitoring
- Simple operation
- No external power requirement for basic indication
- Easy observation of flow changes
- Low-maintenance operation
- Economical flow measurement
- Convenient process troubleshooting
Because the instrument provides direct local indication, it is particularly useful in systems where operators need to quickly verify water circulation.
3000 to 30000 LPH Flow Range
This model provides a high-capacity water-flow measurement range of:
3000 to 30000 LPH
The wide range makes the instrument suitable for high-volume water circulation and process applications.
Potential applications include:
- Water treatment plants
- RO and water purification systems
- Industrial cooling-water systems
- Filtration systems
- Process-water circulation
- Utility-water systems
- Industrial machinery
- Water circulation equipment
- Industrial washing systems
- Process equipment
- General industrial flow monitoring
The actual reading should always be taken from the calibrated scale supplied with the instrument.
Transparent Polycarbonate Body
The measuring body is constructed from polycarbonate, providing a clear viewing section for direct observation of the float.
This transparent construction allows operators to monitor the flow condition visually while the system is operating. It can help identify whether water is flowing normally, whether the flow has reduced significantly, or whether the float is moving abnormally.
The transparent body is useful for:
- Checking water flow
- Observing float position
- Monitoring flow variations
- Identifying unstable flow
- Performing visual inspection
- Detecting significant flow reduction
The rotameter should be operated within the specified temperature and pressure limits to maintain safe and reliable service.
SS 316L Float
The instrument uses an SS 316L float as the moving measurement element.
The float responds directly to changes in water flow. Higher water flow causes the float to move upward, while reduced flow causes it to move downward.
SS 316L is widely used in industrial instrumentation because of its corrosion-resistant characteristics and suitability for many water and process applications.
The stainless-steel float provides a durable measurement element for continuous local flow indication.
2″ BSP (F) Threaded Connections
The rotameter is supplied with:
2″ BSP (F) connections at the top and bottom
These female threaded connections allow installation into suitable piping systems using compatible male-threaded fittings.
The intended flow configuration is:
Bottom Inlet → Measuring Section → Top Outlet
Correct vertical installation is important because the float depends on gravity and fluid flow for proper operation.
Before installation, the connected piping and fittings should be checked for compatibility with the 2″ BSP female threaded connections.
Water Application – Specific Gravity 1
The instrument is specified for:
Water – Specific Gravity 1
The scale is intended for water-flow measurement under the specified conditions.
If a different liquid is used, differences in density and viscosity may affect float position and therefore the indicated flow value. For this reason, this model should be used for its intended water application unless suitable correction factors or application-specific calibration are available.
Maximum Operating Temperature – 60°C
The maximum specified operating temperature is:
60°C
This allows the instrument to be used in a variety of standard and moderately warm water-flow applications.
The actual process temperature should be checked before installation. Operation above the specified maximum temperature should be avoided.
Maximum Operating Pressure – 5 kg/cm²
The maximum specified operating pressure is:
5 kg/cm²
The system should be designed and operated within this pressure limit.
During installation, the possibility of pressure fluctuations, sudden valve operation, pump starting, and pressure surges should also be considered. Proper piping support and alignment can help reduce mechanical stress on the instrument.
Accuracy – 2% of Full Scale
The specified accuracy of the rotameter is:
2% of Full Scale
This level of accuracy is suitable for many general-purpose industrial applications where continuous local water-flow monitoring is required.
The accuracy specification should be evaluated against the requirements of the particular process. Applications requiring highly precise or certified flow measurement may require a different measurement technology.
LPH / LPM Scale
The instrument uses:
LPH / LPM scale graduation
This provides a convenient method for reading water flow using commonly used volumetric flow units.
For consistent readings, the operator should allow the float to stabilize before recording the flow value.
Tamper-Proof Scale Sticker
The rotameter is provided with a tamper-proof scale sticker.
The scale is positioned so that the operator can compare the float position with the corresponding flow graduation.
The viewing section and scale should be kept sufficiently clean to ensure easy reading during operation.
Dimensions
The approximate dimensions of the instrument are:
480 mm Height × 190 mm Width
Due to its high-capacity flow range, adequate installation clearance should be provided around the instrument.
Sufficient space allows operators to:
- Read the scale easily
- Observe float movement
- Perform routine inspection
- Access connections
- Carry out cleaning and maintenance
Industrial Applications
1. Water Treatment Plants
The rotameter can be used for monitoring water flow in suitable treatment and circulation lines.
2. RO and Water Purification Systems
It can provide local visual indication of compatible water-flow circuits in reverse-osmosis and purification equipment.
3. Industrial Cooling-Water Systems
The instrument can help operators monitor water circulation through compatible cooling systems.
4. Filtration Systems
It can be used to observe water flow through appropriate filtration equipment and process lines.
5. Process-Water Systems
The wide 3000–30000 LPH range makes the instrument suitable for higher-capacity process-water applications.
6. Utility-Water Lines
The rotameter can provide simple local flow monitoring in industrial utility-water systems.
7. Industrial Machinery
Suitable applications may include machinery cooling, washing, circulation, and other water-based utility systems.
Benefits
1. Direct Visual Indication
The transparent polycarbonate body enables operators to observe the float and flow condition directly.
2. High Flow Capacity
The 3000 to 30000 LPH range makes this model suitable for high-volume water-flow applications.
3. Simple Operation
The mechanical variable-area principle makes the instrument easy to understand and operate.
4. Economical Flow Monitoring
The rotameter provides a cost-effective alternative for applications that require local flow indication without advanced electronics.
5. Continuous Monitoring
Operators can observe the flow continuously while water is passing through the measuring section.
6. Low Power Requirement
No external power is required for basic mechanical flow indication.
7. Easy Maintenance
The straightforward construction allows convenient visual inspection and routine maintenance.
Installation Guidelines
For correct operation, install the rotameter in a vertical position with the water entering through the bottom and exiting through the top.
Recommended installation practices include:
- Confirm that the calibrated range is 3000–30000 LPH.
- Verify compatibility with the 2″ BSP (F) connections.
- Install vertically.
- Maintain bottom-to-top flow direction.
- Ensure the operating flow remains within the calibrated range.
- Keep pressure below 5 kg/cm².
- Keep temperature below 60°C.
- Properly support the connected piping.
- Avoid excessive vibration.
- Minimize sudden pressure surges.
- Ensure free movement of the float.
- Allow the flow to stabilize before taking readings.
Maintenance
Routine inspection should include the polycarbonate body, SS 316L float, scale, ABS end components, and threaded connections.
If deposits, dirt, or contaminants interfere with float movement or visibility, the instrument should first be isolated from the process and safely depressurized before cleaning.
Regular inspection can help identify abnormal float movement, deposits, physical damage, scale visibility issues, or connection problems.
The instrument should always be maintained according to appropriate site safety and process-isolation procedures.
Conclusion
The Plastic Threaded Rotameter for Water – 3000 to 30000 LPH is a high-capacity, economical, and easy-to-use solution for continuous local monitoring of water flow. Its transparent polycarbonate body, SS 316L float, ABS end construction, 2″ BSP (F) connections, LPH/LPM scale, and bottom-inlet/top-outlet configuration provide a straightforward method of visual flow measurement.
With a 3000–30000 LPH flow range, 2% full-scale accuracy, 60°C maximum operating temperature, and 5 kg/cm² maximum operating pressure, this rotameter is suitable for a wide range of compatible industrial water-flow applications.
It is particularly useful for water treatment plants, RO systems, cooling-water circuits, filtration systems, process-water lines, utility-water systems, industrial machinery, and water circulation equipment where operators need a dependable and easily visible indication of flow.
The combination of high flow capacity, simple variable-area operation, direct visual indication, robust SS 316L float, transparent polycarbonate construction, and economical design makes this Plastic Threaded Rotameter a practical choice for industrial water-flow monitoring.
Japsin Instrumentation – Since 1974
Nihit Das –
Excellent Service
Arjun Sharma –
Perfect fit, outstanding service!
Urvi Choudhury –
Nice Product