Description
Plastic Threaded Rotameter for Water – 2000 to 20000 LPH
The Plastic Threaded Rotameter for Water, Range 2000 to 20000 LPH is a high-capacity variable-area flow measurement instrument designed for continuous, direct, and economical monitoring of water flow in industrial, commercial, process, utility, and water-treatment applications. With a wide measurement capability and a maximum specified flow range 2000 to 20000 Litres Per Hour (LPH), this rotameter is suitable for applications where operators require a simple and clearly visible indication of water flow.
The instrument is designed for water with a specific gravity of 1 and features a transparent polycarbonate body, SS 316L float, and ABS end material. The transparent construction allows the operator to observe the float directly while the system is operating, making it easy to identify changes in flow without requiring an external electronic display.
This model is supplied with 2 1/2″ BSP (F) threaded connections at the top and bottom for inline installation into compatible piping systems. The recommended flow configuration is bottom inlet and top outlet, allowing water to pass upward through the measuring section and move the float according to the actual flow rate.
The rotameter works according to the proven variable-area flow measurement principle. When water enters through the bottom connection, the upward flow force lifts the SS 316L float. As flow increases, the float rises; as flow decreases, the float moves downward. Once the flow becomes stable, the float settles at a corresponding position on the graduated scale, allowing the operator to determine the approximate 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 water-flow indication within its specified operating conditions.
Variable-Area Flow Measurement Principle
The Plastic Threaded Rotameter operates using the variable-area principle, one of the simplest and most widely used methods for local flow indication.
Water enters the instrument through the lower connection and flows upward through the measuring passage. The movement of water produces an upward force on the float. The float rises until the upward flow force and opposing forces reach equilibrium.
The position of the float corresponds to the flow rate. The operator can observe the float through the transparent polycarbonate body and read its position against the graduated scale.
The mechanical operating principle offers several practical advantages:
- Direct visual flow indication
- Continuous local monitoring
- No external power required for basic indication
- Simple operation
- Easy observation of flow changes
- Low-maintenance design
- Economical measurement solution
- Convenient process troubleshooting
This makes the rotameter particularly useful where a straightforward local indication is required rather than a complex electronic flowmeter.
High-Capacity Water Flow Measurement
This model is intended for higher-flow water applications, with the stated product range extending up to:
2000 to 20000 LPH
A high-capacity rotameter can be useful in water circuits where conventional low-flow rotameters are insufficient.
Potential applications include:
- Industrial water-treatment plants
- RO and water-purification systems
- Cooling-water circulation
- Filtration systems
- Process-water lines
- Utility-water distribution
- Industrial machinery
- Water circulation systems
- Cleaning and washing systems
- Process equipment
- Industrial water-flow monitoring
The actual flow range should always be verified against the calibration scale supplied with the instrument.
Transparent Polycarbonate Body
The measuring body is manufactured from polycarbonate, providing a transparent viewing section through which the float can be observed.
This is particularly useful for local process monitoring because the operator can visually determine whether the system is operating at the expected flow condition.
The transparent body helps with:
- Confirming water flow
- Observing float position
- Monitoring flow variations
- Identifying unstable flow
- Detecting significant reductions in flow
- Performing routine visual inspection
Polycarbonate also provides a lightweight construction compared with many metallic flow-measuring bodies.
The instrument must be operated within the specified 60°C maximum temperature and 5 kg/cm² maximum operating pressure.
SS 316L Float
The rotameter incorporates an SS 316L float as its moving measurement element.
The float moves vertically inside the measuring section in response to changes in water flow. Higher flow causes the float to move upward, while lower flow causes it to move downward.
SS 316L is widely used in industrial instrumentation because of its corrosion-resistant properties and suitability for many compatible water and process applications.
The stainless-steel float provides a durable measurement element for continuous visual monitoring.
2″ BSP (F) Connections
The instrument is specified with:
2 1/2″ BSP (F) threaded connections at top and bottom
The female threaded connections allow the rotameter to be connected to compatible male-threaded piping or fittings.
The standard installation arrangement is:
Bottom Inlet → Measuring Section → Top Outlet
The rotameter should be installed vertically because correct float movement depends on the instrument’s intended orientation.
Before installation, verify that the connected piping, fittings, thread type, and sealing arrangement are compatible with the 2 1/2″ BSP female connections.
Water Application – Specific Gravity 1
The rotameter is designed for:
Water – Specific Gravity 1
The flow scale is calibrated for the specified water characteristics.
If the instrument is used with another liquid, differences in density and viscosity can affect float position and therefore the indicated flow rate. For this reason, the product should primarily be used for the specified water application unless suitable correction factors or application-specific calibration are available.
Maximum Operating Temperature – 60°C
The specified maximum operating temperature is:
60°C
This allows the rotameter to be used in a broad range of standard and moderately warm water applications.
Before installation, the actual operating temperature should be checked against the specified limit. The instrument should not be operated above its rated maximum temperature.
Maximum Operating Pressure – 5 kg/cm²
The maximum specified operating pressure is:
5 kg/cm²
The connected water system should remain within this pressure limitation.
System designers should also consider pressure fluctuations, water hammer, and other transient conditions that may occur during pump starting, valve operation, or process changes.
Proper piping alignment and support should be provided to minimize mechanical stress on the instrument and its threaded connections.
Accuracy – 2% of Full Scale
The specified accuracy is:
2% of Full Scale
This makes the instrument suitable for general-purpose water-flow monitoring where operators need reliable local indication rather than laboratory-level measurement.
The accuracy specification should be considered when selecting the rotameter for a particular process. For critical applications requiring certified or highly precise flow measurement, the application requirements should be evaluated separately.
LPH / LPM Scale Graduation
The rotameter features scale graduation in:
LPH / LPM
This allows the operator to monitor water flow using commonly used volumetric flow units.
The float should be allowed to stabilize before taking a reading. Maintaining stable process conditions can help improve reading consistency.
Tamper-Proof Scale Sticker
A tamper-proof scale sticker is provided for flow indication.
The scale allows operators to compare the position of the SS 316L float with the corresponding flow graduation.
The scale should remain clearly visible during operation, and the transparent body should be kept sufficiently clean to allow easy observation of the float.
Dimensions
The specified approximate dimensions are:
480 mm Height × 190 mm Width
Because this is a large-capacity rotameter, sufficient installation space should be provided around the instrument.
Adequate clearance allows:
- Easy reading of the scale
- Visual observation of the float
- Routine inspection
- Cleaning and maintenance
- Convenient access to threaded connections
Applications
1. Water Treatment Plants
The rotameter can be used for local flow indication in water-treatment systems, circulation lines, filtration equipment, and related process sections.
2. RO Plants
It can be used to monitor suitable high-flow water lines associated with reverse-osmosis and water-purification systems.
3. Cooling-Water Circuits
Industrial cooling systems require adequate water circulation. This rotameter can provide local visual indication of compatible cooling-water flow.
4. Filtration Systems
The instrument can be installed in suitable filtration circuits to observe water-flow conditions through the system.
5. Industrial Process Water
The high-capacity flow range makes the instrument useful for process-water monitoring in compatible industrial applications.
6. Utility Water Systems
It can be used in industrial utility-water distribution and circulation systems where local flow indication is required.
7. Industrial Machinery
Suitable machinery applications may include water-based cooling, circulation, washing, and process systems.
Benefits
1. Simple Visual Monitoring
The transparent body allows operators to observe the float directly and determine the approximate flow rate without relying on an electronic display.
2. Economical Solution
The mechanical construction provides a cost-effective option for applications where direct local flow indication is sufficient.
3. Continuous Indication
The instrument provides continuous flow indication whenever water is passing through the measuring section.
4. Easy to Understand
The variable-area operating principle is straightforward, making the instrument convenient for operators and maintenance personnel.
5. High Flow Capacity
The instrument is designed for high-volume water-flow applications, with the supplied product information indicating a maximum range 2000 to 20000 LPH.
6. Low Power Requirement
No external electrical power is required for basic mechanical flow indication.
Installation Guidelines
For proper operation, the rotameter should be installed in a vertical position with the flow entering from the bottom and leaving from the top.
Recommended installation checks include:
- Verify the actual calibrated flow range before commissioning.
- Confirm compatibility with the 2 1/2″ BSP (F) connections.
- Install the rotameter vertically.
- Maintain the specified bottom-to-top flow direction.
- Keep operating flow within the calibrated range.
- Do not exceed 5 kg/cm² operating pressure.
- Do not exceed 60°C operating temperature.
- Properly support the connected piping.
- Avoid excessive vibration and mechanical loading.
- Allow flow to stabilize before taking readings.
- Ensure the float moves freely within the measuring section.
- Keep the viewing section sufficiently clean for clear float observation.
Maintenance
The simple construction of this Plastic Threaded Rotameter makes routine maintenance straightforward. Periodically inspect the polycarbonate body, SS 316L float, scale sticker, ABS ends, and threaded connections.
If dirt, deposits, or other contaminants affect float movement or visibility, the instrument should be isolated from the process and safely depressurized before inspection or cleaning.
Routine inspection can help identify:
- Abnormal float movement
- Deposits inside the measuring section
- Damaged body components
- Thread or connection problems
- Scale visibility issues
- Unexpected changes in flow indication
The rotameter should always be serviced in accordance with appropriate site safety procedures.
Conclusion
The Plastic Threaded Rotameter for Water – 2000 to 20000 LPH is a practical solution for continuous local monitoring of high-volume water flow. Its transparent polycarbonate body, SS 316L float, ABS end construction, LPH/LPM scale, tamper-proof scale sticker, and 2 1/2″ BSP (F) connections provide a straightforward and economical method of visual flow indication.
With 2% full-scale accuracy, a maximum operating temperature of 60°C, and maximum operating pressure of 5 kg/cm², the instrument is suitable for a wide range of compatible industrial water-flow applications, including water treatment, RO systems, cooling-water circuits, filtration systems, process-water lines, and industrial utility systems.
The combination of simple variable-area measurement, high flow capacity, direct visual indication, and easy-to-understand operation makes this rotameter an effective choice for industrial users looking for economical local water-flow monitoring.
Japsin Instrumentation – Since 1974
Kiyan Chauhan –
Great value
Arya Patel –
Excellent investment, reliable performance!
Udit Kapoor –
Nice Product