Description
Plastic Threaded Rotameter for Water – 10000 to 50000 LPH
The Plastic Threaded Rotameter for Water, Range 10000 to 50000 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 flow measurement range of 10000 to 50000 Litres Per Hour (LPH), this model is suitable for high-volume water circulation systems where reliable local flow indication is required.
The rotameter is specifically designed for water with a specific gravity of 1 and features a transparent polycarbonate body, SS 316L float, and ABS end material. The transparent measuring section allows operators to visually observe the float position during operation and determine the corresponding flow rate from the graduated scale. This provides a simple method of monitoring flow without requiring external electrical power or a separate digital display.
The instrument is supplied with 2 1/2″ BSP (F) threaded connections at both the top and bottom, making it suitable for inline installation with compatible piping systems. The standard flow arrangement is bottom inlet and top outlet. Correct vertical installation is important because the rotameter operates using the relationship between fluid flow, float position, and gravity.
The instrument works on the proven variable-area flow measurement principle. When water enters through the bottom connection, the upward flow force causes the SS 316L float to rise within the measuring section. As the water flow increases, the float moves upward; when the flow decreases, the float moves downward. Once the flow becomes stable, the float settles at a corresponding position on the scale, allowing the operator to read 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 rotameter is designed for general-purpose high-flow water monitoring within its specified operating conditions.
Variable-Area Flow Measurement Principle
The Plastic Threaded Rotameter uses a simple and reliable variable-area principle.
Water enters the measuring section from the bottom and flows upward. The upward force generated by the water causes the float to rise. The float continues moving until the upward force created by the fluid flow is balanced by the opposing forces acting on the float.
The resulting float position corresponds to the water-flow rate. The operator can observe the float through the transparent polycarbonate body and compare its position with the graduated scale.
This operating principle offers several advantages:
- Direct visual flow indication
- Continuous local flow monitoring
- Simple mechanical operation
- No external power required for basic indication
- Easy observation of flow variations
- Low-maintenance construction
- Economical flow measurement
- Convenient process monitoring
10000 to 50000 LPH High Flow Range
This model is designed for high-capacity water-flow measurement over a range of:
10000 to 50000 LPH
The high upper range makes it suitable for larger industrial water systems where substantial quantities of water need to be monitored.
Potential applications include:
- Industrial water-treatment plants
- Large RO and water-purification systems
- Industrial cooling-water circuits
- Filtration systems
- Process-water distribution
- Water circulation systems
- Industrial utility-water lines
- Machinery cooling systems
- Industrial washing systems
- Process equipment
- General-purpose water-flow monitoring
The actual flow reading should always be taken using the calibrated scale supplied with the instrument.
Transparent Polycarbonate Body
The measuring body is manufactured from polycarbonate and provides a transparent viewing section for direct observation of the float.
This allows operators to visually monitor the water-flow condition while the system is operating. The transparent body can make it easier to identify changes in flow and observe whether the float is moving normally.
The transparent construction is useful for:
- Confirming water flow
- Observing float position
- Monitoring variations in flow
- Identifying unstable flow conditions
- Performing routine visual inspection
- Detecting significant flow reduction
The instrument should be operated within the specified maximum temperature and pressure limits.
SS 316L Float
The rotameter incorporates an SS 316L float as its primary moving measurement element.
The float responds to the flow of water inside the measuring section. Increased water flow causes the float to move upward, while reduced flow causes it to move downward.
SS 316L is commonly used for industrial instrumentation because of its corrosion-resistant characteristics and suitability for many compatible water and process applications.
The stainless-steel float provides a durable and easily observable measurement element for continuous local flow indication.
2″ BSP (F) Threaded Connections
This model is supplied with:
2 1/2″ BSP (F) connections at the top and bottom
These female threaded connections allow the rotameter to be installed in compatible piping systems using suitable male-threaded fittings.
The recommended flow arrangement is:
Bottom Inlet → Measuring Section → Top Outlet
The instrument should be installed vertically to ensure correct float movement and reliable indication.
Before installation, verify the compatibility of the piping, fittings, sealing method, and thread specifications with the supplied 2 1/2″ BSP female connections.
Designed for Water – Specific Gravity 1
The instrument is designed for:
Water – Specific Gravity 1
The scale is intended for water-flow measurement under the specified operating conditions.
If the rotameter is used with a fluid having different density or viscosity characteristics, the float position may not correspond directly to the indicated water-flow value. Therefore, the product should be used primarily for its specified water application unless appropriate 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 wide range of standard and moderately warm water-flow applications.
The actual process temperature should be checked before installation. The specified maximum operating temperature should not be exceeded.
Maximum Operating Pressure – 5 kg/cm²
The maximum specified operating pressure is:
5 kg/cm²
The water system should be designed and operated within this pressure limit.
During system design, pressure fluctuations and transient conditions such as pump starting, valve operation, and water hammer should also be considered.
Proper piping alignment and support are recommended to reduce mechanical loading on the rotameter and its threaded connections.
Accuracy – 2% of Full Scale
The specified accuracy of the rotameter is:
2% of Full Scale
This specification makes the instrument suitable for many general-purpose industrial water-flow monitoring applications.
The accuracy should be evaluated against the requirements of the particular process. Where highly precise, certified, or custody-transfer flow measurement is required, an application-specific flow measurement solution may be more appropriate.
LPH / LPM Scale Graduation
The rotameter uses:
LPH / LPM scale graduation
This provides convenient flow indication in commonly used litres-per-hour and litres-per-minute units.
For consistent readings, the water flow should be allowed to stabilize before the operator records the indicated value.
Tamper-Proof Scale Sticker
The instrument is supplied with a tamper-proof scale sticker.
The scale provides a visual reference for interpreting the position of the SS 316L float.
The viewing section and scale should be kept clean and clearly visible so that operators can easily monitor the flow during operation.
Dimensions
The specified approximate dimensions are:
480 mm Height × 190 mm Width
Adequate installation clearance should be provided around the instrument. This is particularly important for high-flow applications where the rotameter may be installed in larger piping systems.
Sufficient clearance allows easy:
- Scale reading
- Float observation
- Visual inspection
- Cleaning
- Maintenance
- Access to threaded connections
Applications
1. Water Treatment Plants
The rotameter can be used for local monitoring of high-volume water flow through suitable treatment, filtration, and circulation systems.
2. RO and Water Purification Systems
It can provide direct visual flow indication in compatible high-capacity water purification and RO systems.
3. Industrial Cooling Water
The instrument can be used to monitor water circulation through compatible industrial cooling circuits.
4. Filtration Plants
It can provide a convenient visual indication of water flow through suitable filtration equipment.
5. Process-Water Systems
The 10000–50000 LPH range makes this model suitable for high-capacity process-water circuits.
6. Utility-Water Distribution
The rotameter can be used in industrial utility-water systems where continuous local flow indication is required.
7. Industrial Machinery
It can be considered for compatible machinery cooling, water circulation, washing, and process-water applications.
Benefits
High Flow Measurement Capability
The 10000 to 50000 LPH range allows the instrument to be used for high-volume water-flow applications.
Direct Visual Indication
The transparent polycarbonate body makes it possible to observe the float position directly.
Simple Operation
The variable-area measurement principle is straightforward and easy for operators to understand.
Economical Solution
The mechanical design offers a cost-effective option for applications requiring local flow indication.
Continuous Monitoring
The operator can monitor water flow continuously while the system is running.
No External Power Required
Basic mechanical indication does not require an external electrical power supply.
Easy Inspection
The transparent body and visible float allow convenient visual checking of the flow condition.
Installation Guidelines
For correct operation, the rotameter should be installed vertically, with water entering from the bottom and exiting through the top.
Recommended installation practices include:
- Confirm that the required operating flow falls within 10000–50000 LPH.
- Verify compatibility with the 2 1/2″ BSP (F) connections.
- Install the instrument vertically.
- Maintain bottom-to-top flow direction.
- Keep operating flow within the calibrated range.
- Ensure pressure remains below 5 kg/cm².
- Ensure process temperature remains below 60°C.
- Provide adequate support for the connected piping.
- Avoid excessive vibration.
- Minimize sudden pressure surges.
- Ensure the float can move freely.
- Allow the flow to stabilize before taking a reading.
Maintenance
The rotameter’s simple mechanical construction makes routine inspection straightforward. Periodically inspect the polycarbonate body, SS 316L float, scale, ABS end components, and threaded connections.
If dirt, deposits, or other contaminants interfere with float movement or visibility, isolate the instrument from the process and safely depressurize the line before cleaning or servicing.
Routine inspection can help identify:
- Abnormal float movement
- Deposits inside the measuring section
- Physical damage
- Connection problems
- Reduced visibility
- Unexpected changes in flow indication
Maintenance should always be performed using appropriate process-isolation and safety procedures.
Conclusion
The Plastic Threaded Rotameter for Water – 10000 to 50000 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 material, 2 1/2″ BSP (F) threaded connections, LPH/LPM scale, and bottom-inlet/top-outlet configuration provide a straightforward method of visual flow measurement.
With a 10000–50000 LPH flow range, 2% full-scale accuracy, 60°C maximum operating temperature, and 5 kg/cm² maximum operating pressure, this model is suitable for a wide range of compatible high-volume water-flow applications.
It can be used in water-treatment plants, RO systems, industrial cooling-water circuits, filtration systems, process-water lines, industrial utility systems, machinery cooling applications, and water circulation equipment where direct and easily visible flow indication is required.
The combination of high flow capacity, transparent construction, SS 316L float, simple variable-area operation, direct visual indication, and economical design makes this Plastic Threaded Rotameter a practical choice for industrial water-flow monitoring.
Japsin Instrumentation – Since 1974
Aadit Malhotra –
Quality product
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Top-notch quality, reliable performance!
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