Description
Plastic Threaded Rotameter for Water – 50 to 500 LPH
The JI-PTR-500-OL Plastic Threaded Rotameter for Water, Range 50 to 500 LPH is a compact and economical variable-area flow meter designed for accurate and convenient measurement of water flow in low-flow industrial, commercial, laboratory, process, and utility applications. Developed for users who require a simple, direct-reading flow measurement solution, this plastic threaded rotameter provides continuous visual indication of water flow without requiring an external electrical power supply.
With a measurement range of 50 to 500 Litres Per Hour (LPH), the JI-PTR-500-OL is suitable for applications where water flow needs to be monitored at relatively low and moderate flow rates. Its compact construction makes it convenient for installation on water lines where available space is limited and where a lightweight alternative to conventional metallic flow meters is preferred.
The instrument operates on the variable-area principle, using a float inside a tapered measuring passage. As water enters the rotameter, the flow causes the float to move upward. The float settles at a position corresponding to the flow rate, allowing the operator to obtain a direct visual indication from the graduated scale.
The JI-PTR-500-OL is particularly suitable for applications where simple operation, easy visual monitoring, economical installation, and low maintenance are important considerations.
Variable-Area Flow Measurement Principle
The JI-PTR-500-OL works according to the well-established variable-area flow measurement principle.
Water enters the measuring tube from the lower side and flows upward. As the water flow increases, the float rises. As the flow decreases, the float moves downward. Once the flow becomes stable, the float settles at a corresponding position on the calibrated scale.
This provides a straightforward relationship between float position and water flow.
The variable-area principle offers several practical advantages:
- Simple mechanical construction
- Direct visual flow indication
- No electrical power required for indication
- Continuous flow monitoring
- Easy operation
- Low maintenance
- Compact installation
- Economical flow measurement
This makes the rotameter particularly useful for general-purpose water-flow applications.
50 to 500 LPH Flow Range
The JI-PTR-500-OL is designed for a flow range of:
50 to 500 LPH
This range makes the instrument suitable for water-flow monitoring systems where flow rates are higher than those covered by smaller low-flow rotameter models.
The graduated scale allows operators to monitor the water flow directly and identify changes in process conditions.
The instrument can be used for monitoring water flow in:
- Water treatment systems
- RO and purification equipment
- Cooling-water circuits
- Laboratory systems
- Filtration equipment
- Industrial machinery
- Process equipment
- Utility-water lines
- Small circulation systems
- General industrial water applications
The actual application suitability should be evaluated based on the operating pressure, temperature, fluid characteristics, piping configuration, and required accuracy.
Plastic Construction
The JI-PTR-500-OL uses a plastic-based construction that provides a lightweight and economical alternative to heavier metallic flow-meter assemblies.
A plastic rotameter can be advantageous in applications where:
- Low instrument weight is preferred
- Corrosion resistance is important
- A transparent flow section is required
- Cost-effective instrumentation is desired
- Easy visual inspection is required
The transparent measuring section allows operators to observe the float directly during operation. This makes it easier to identify whether the float is moving correctly and whether the flow remains stable.
Easy Visual Flow Indication
One of the main advantages of a rotameter is its simple visual indication.
The operator can observe the float position and compare it with the graduated flow scale. This makes the instrument convenient for applications where a local flow reading is required without the complexity of an electronic transmitter or digital display.
Because the measurement is directly visible, the rotameter can also be useful during equipment commissioning, maintenance, troubleshooting, and routine process inspection.
Inline Installation
The threaded design of the JI-PTR-500-OL makes it suitable for installation directly into compatible piping arrangements.
The rotameter should be installed in the correct vertical orientation so that the float can move freely under the influence of the flowing water and gravity.
Correct installation is important for obtaining the intended flow indication.
Before installation, users should verify:
- Flow direction
- Connection compatibility
- Available installation space
- Operating pressure
- Operating temperature
- Water quality
- Required flow range
- Pipe alignment
Suitable sealing and connection practices should be followed according to the piping system and installation requirements.
Suitable for Water Applications
The JI-PTR-500-OL is intended for water-flow measurement.
Water-flow monitoring is required in numerous industrial and commercial systems. A local rotameter can provide operators with a convenient way to confirm that the expected water flow is present.
Applications may include cooling circuits, water-treatment equipment, filtration systems, laboratory equipment, process machinery, and utility-water systems.
The instrument should be used within the specified operating conditions and with fluid properties corresponding to the calibrated application.
Applications in Water Treatment
Water treatment equipment often requires continuous confirmation of flow through filters, membranes, treatment chambers, or circulation loops.
The JI-PTR-500-OL can provide a local visual indication that helps operators identify whether the water flow is within the expected operating range.
It can be considered for compatible:
- Filtration systems
- Water purification units
- RO systems
- Water circulation equipment
- Treatment skids
- Utility-water systems
Cooling-Water Monitoring
Industrial machinery and equipment frequently use water for cooling.
Maintaining an appropriate water flow can be important for the performance of cooling circuits. The JI-PTR-500-OL can be installed on suitable low-flow cooling-water lines to provide a local indication of flow.
Operators can use the indication to identify abnormal flow conditions and support routine maintenance activities.
Laboratory and Process Applications
The compact design of the JI-PTR-500-OL makes it suitable for compatible laboratory and small process systems where direct flow indication is required.
It can be incorporated into equipment and test systems where water needs to be circulated at a controlled or monitored rate.
The transparent construction allows the operator to observe the float and quickly confirm whether flow is present.
Economical Flow Measurement Solution
The JI-PTR-500-OL is designed as an economical alternative for applications where sophisticated electronic flow measurement may not be necessary.
A conventional rotameter does not require a separate power supply for its basic visual indication. This simplifies installation and reduces the number of electrical connections required.
For general-purpose flow monitoring, this can result in a practical and cost-effective instrumentation solution.
Low-Maintenance Operation
The simple mechanical design of a rotameter generally allows straightforward operation and routine maintenance.
There are no complicated electronic displays or external power connections required for direct visual indication. Regular inspection of the measuring section, float movement, connections, and process conditions can help maintain reliable operation.
The transparent body also assists in visual inspection of the measuring passage.
Key Features
- Model: JI-PTR-500-OL
- Plastic threaded rotameter
- Designed for water-flow measurement
- Flow range: 50 to 500 LPH
- Variable-area flow measurement principle
- Direct visual indication
- Compact construction
- Lightweight design
- Easy-to-read graduated scale
- Suitable for inline installation
- Suitable for water-treatment applications
- Suitable for cooling-water systems
- Suitable for RO and filtration equipment
- Suitable for laboratories and process equipment
- No external power required for basic visual indication
- Economical and easy-to-use flow measurement solution
- Low-maintenance mechanical design
Why Choose JI-PTR-500-OL?
The JI-PTR-500-OL Plastic Threaded Rotameter is a practical choice for users looking for simple and economical water-flow measurement in the 50 to 500 LPH range.
Its variable-area measuring principle provides continuous visual indication without the complexity of electronic instrumentation. The transparent plastic construction allows the float to be observed directly, while the threaded configuration supports convenient integration into compatible water piping systems.
For water-treatment equipment manufacturers, industrial maintenance teams, OEMs, laboratory equipment manufacturers, process engineers, and utility-system operators, the JI-PTR-500-OL can provide an effective solution for routine water-flow monitoring.
Installation Guidelines
For reliable operation, the JI-PTR-500-OL should be installed in a vertical flow path, allowing the float to move freely. The flow direction should follow the instrument’s specified inlet and outlet arrangement.
The piping should be properly aligned and adequately supported so that mechanical stress is not transferred to the rotameter body or threaded connections.
Before commissioning, verify that:
- The flow direction is correct.
- The instrument is installed vertically.
- The water flow is within the 20–200 LPH range.
- Operating pressure and temperature are within the applicable limits.
- The connections are properly sealed.
- The float moves freely.
- The reading is taken after the flow becomes stable.
Conclusion
The JI-PTR-500-OL Plastic Threaded Rotameter for Water, 50 to 500 LPH is a compact, economical, and easy-to-use instrument for local water-flow monitoring. Its variable-area operating principle provides direct visual indication of flow, making it suitable for applications where operators need a simple way to observe and monitor water circulation.
The rotameter can be considered for water-treatment plants, RO systems, filtration equipment, cooling-water circuits, laboratory systems, process machinery, utility-water lines, and other compatible low-flow applications.
With its straightforward mechanical operation, transparent measuring concept, compact construction, and 20–200 LPH flow range, the JI-PTR-500-OL is an effective solution for general-purpose water-flow indication where simplicity, visibility, and economical instrumentation are important.
Japsin Instrumentation – Since 1974
Tanya Joshi –
Very reliable
Raahi Sharma –
Great value, top-notch quality!
Ivaan Patel –
Nice Product