Description
“Ji” Japsin Instrumentation Capsule Compound Gauge – 4″ (100 mm) Dial | Range -500 to 500 mmWC | Dual Scale -50 to 50 mBar | Bottom Entry 1/2″ NPT (M) | Stainless Steel Case & Wetted Parts
The “Ji” Japsin Instrumentation Capsule Compound Gauge is a precision-engineered low-pressure measuring instrument designed to accurately monitor both negative (vacuum) and positive pressure in industrial applications. Built for reliability and long-term performance, this gauge is widely used in industries where precise low-pressure monitoring is essential for safe and efficient system operation.
With a 4-inch (100 mm) dial size, the instrument offers excellent visibility and easy readability, even in demanding industrial environments. The gauge operates across a compound pressure range of -500 to 500 mmWC, enabling users to monitor vacuum and pressure conditions within the same system. In addition, the instrument includes a dual scale of -50 to 50 mBar, allowing operators to quickly read measurements in multiple engineering units without conversion.
Designed using a high-sensitivity capsule element, this gauge is specifically suited for detecting and measuring very low pressures with high accuracy. The capsule sensing mechanism ensures stable readings and reliable response to small pressure changes, making the instrument ideal for air, gas, and other non-corrosive media applications.
The gauge is manufactured with a stainless steel case and stainless steel wetted parts, ensuring excellent corrosion resistance, durability, and long service life. The bayonet type case design provides convenient access for inspection, servicing, or recalibration while maintaining strong structural integrity and protection for the internal mechanism.
Equipped with a direct mounting bottom entry configuration and a 1/2″ NPT male process connection, the gauge can be easily installed in a wide range of industrial systems including pipelines, duct systems, pressure panels, and instrumentation assemblies.
The Ji Japsin Capsule Compound Gauge is widely used in HVAC systems, cleanrooms, filtration monitoring systems, pharmaceutical facilities, laboratories, process plants, and industrial air handling units where accurate measurement of low pressure or vacuum is required.
High Precision Low Pressure Measurement
Low pressure measurement plays a critical role in maintaining the efficiency and safety of many industrial processes. Systems such as air filtration units, ventilation ducts, cleanroom pressure control systems, and blower lines rely on precise pressure monitoring to ensure proper airflow, contamination control, and system stability.
The Ji Japsin Capsule Compound Gauge is specifically designed to measure small pressure differentials and vacuum conditions with exceptional sensitivity. Unlike conventional pressure gauges that are typically used for high-pressure applications, capsule gauges are optimized for very low-pressure ranges.
The internal capsule element expands and contracts in response to pressure variations, converting these changes into precise mechanical movement that is displayed on the dial. This design ensures consistent measurement accuracy and quick response to pressure changes.
Because of this precision, capsule compound gauges are commonly used in industries where even minor pressure variations can affect process quality, equipment performance, or environmental control.
Compound Pressure Measurement Capability
One of the most important features of this instrument is its compound pressure measurement capability. The gauge measures both:
-
Vacuum (negative pressure)
-
Positive pressure
The measurement range of -500 to 500 mmWC allows operators to monitor pressure fluctuations that move above and below atmospheric pressure within the same system.
This capability is extremely useful in applications such as:
-
Air handling systems
-
Industrial ventilation
-
Filtration units
-
Blower pressure monitoring
-
Dust collection systems
-
Cleanroom pressure balancing
The compound range allows technicians to quickly identify whether the system is operating under vacuum or positive pressure conditions.
Dual Scale for Flexible Pressure Readings
The gauge includes a dual scale display with:
-
-500 to 500 mmWC (millimeters of water column)
-
-50 to 50 mBar
Dual scale functionality allows engineers and operators to read pressure values in different units without requiring external conversion charts or calculations.
This feature is especially useful in industrial environments where:
-
Different engineering teams use different measurement units
-
Equipment specifications are defined in multiple units
-
System calibration requires quick comparison between scales
The dual scale improves operational efficiency and reduces the risk of interpretation errors.
Large 4-Inch Dial for Clear Visibility
The instrument features a 4-inch (100 mm) dial size, which provides excellent readability for operators and technicians.
The large dial offers several advantages:
-
Clear and easy pressure reading from a distance
-
Reduced risk of operator error
-
Improved monitoring in industrial environments
-
Better visibility in control rooms or plant floors
The dial markings are designed for precise scale interpretation, allowing users to quickly observe pressure trends and changes during system operation.
High Sensitivity Capsule Sensing Element
The core measurement component of the gauge is the capsule sensing element, which is specifically engineered for accurate low-pressure measurement.
The capsule element consists of two thin metallic diaphragms sealed together to form a capsule-shaped chamber. When pressure is applied to the capsule, it expands or contracts depending on the pressure difference.
This movement is mechanically transmitted to the pointer mechanism through a linkage system, which converts the pressure change into a readable dial indication.
Key advantages of capsule sensing technology include:
-
High sensitivity to small pressure changes
-
Stable measurement performance
-
Accurate low-pressure readings
-
Reliable response to pressure fluctuations
This makes the gauge ideal for precision applications where low pressure measurement is critical.
Stainless Steel Construction for Durability
The Ji Japsin Capsule Compound Gauge is constructed with stainless steel materials to ensure durability and long service life.
Stainless Steel Case
The SS case protects the internal components from:
-
Mechanical damage
-
Environmental exposure
-
Industrial contaminants
-
Moisture and dust
The robust casing ensures reliable operation in demanding industrial environments.
Stainless Steel Wetted Parts
The wetted parts of the gauge are also made from stainless steel, which provides:
-
Excellent corrosion resistance
-
Compatibility with industrial gases
-
Long operational lifespan
-
Resistance to oxidation and chemical exposure
This construction ensures that the instrument maintains consistent performance even in challenging process conditions.
Bayonet Type Case for Easy Maintenance
The gauge features a bayonet type case design, which provides quick and convenient access to the internal mechanism.
Advantages of the bayonet case include:
-
Easy opening for calibration
-
Quick maintenance access
-
Simplified servicing
-
Secure case locking system
This design allows technicians to perform inspection, maintenance, or recalibration without damaging the instrument housing.
Bottom Entry Direct Mounting Design
The gauge is designed with a direct mounting bottom entry configuration, making installation simple and convenient.
In this configuration, the process connection is located at the bottom of the gauge, allowing the instrument to be directly mounted on pipelines, ducts, or pressure ports.
Benefits of bottom entry mounting include:
-
Compact installation
-
Stable mounting position
-
Easy integration with industrial systems
-
Improved visibility of the dial
Bottom entry gauges are widely used in panel installations, duct pressure measurement, and equipment-mounted instrumentation systems.
Standard 1/2″ NPT Male Process Connection
The gauge is equipped with a 1/2 inch NPT male process connection, which is a widely used industrial threading standard.
This ensures compatibility with:
-
Standard industrial piping systems
-
Instrumentation manifolds
-
Pressure tapping points
-
Process equipment connections
The standard thread design simplifies installation and allows the gauge to be integrated into existing pressure monitoring systems without additional adapters.
Industrial Applications
The Ji Japsin Capsule Compound Gauge is suitable for a wide range of industrial applications that require accurate low-pressure measurement and vacuum monitoring.
HVAC Systems
In heating, ventilation, and air conditioning systems, the gauge is used to monitor:
-
Air duct pressure
-
Airflow balance
-
Filter pressure drop
-
Fan and blower performance
Accurate pressure monitoring ensures efficient air distribution and system operation.
Cleanroom Pressure Monitoring
Cleanrooms require precise pressure control to prevent contamination. Capsule compound gauges are used to monitor:
-
Room pressure differentials
-
Airlock pressure balance
-
Positive pressure containment systems
Maintaining the correct pressure difference ensures contamination control and regulatory compliance.
Filtration and Dust Collection Systems
Pressure gauges are commonly installed across filters to measure pressure drop, which indicates filter condition.
Applications include:
-
Industrial air filters
-
Dust collectors
-
HEPA filtration systems
-
Pollution control units
Monitoring pressure drop helps identify when filters need cleaning or replacement.
Pharmaceutical and Laboratory Equipment
In pharmaceutical manufacturing and laboratory environments, accurate low-pressure measurement ensures:
-
Controlled air handling
-
Cleanroom operation
-
Equipment performance monitoring
The capsule compound gauge supports reliable pressure measurement in sensitive environments.
Industrial Blowers and Ventilation Systems
Blower systems require constant monitoring of air pressure to ensure proper airflow and system stability.
The gauge helps operators monitor:
-
Suction pressure
-
Discharge pressure
-
Airflow conditions
-
System performance
Quality Engineering and Reliable Performance
Ji Japsin instrumentation products are designed to meet the performance requirements of industrial process monitoring systems.
Each gauge is manufactured using high-quality materials and precision engineering techniques to ensure:
-
Accurate pressure measurement
-
Long operational life
-
Stable performance
-
Reliable industrial operation
The robust design and durable construction make the gauge suitable for continuous operation in industrial environments.
Conclusion
The “Ji” Japsin Instrumentation Capsule Compound Gauge is a reliable and precise solution for low-pressure and vacuum measurement in industrial environments. With its high sensitivity capsule element, large 4-inch dial, dual scale pressure range, stainless steel construction, and easy maintenance bayonet case, the instrument offers dependable performance across a wide range of applications.
Designed for industries such as HVAC, pharmaceuticals, cleanrooms, filtration systems, laboratories, and process plants, this gauge provides accurate pressure monitoring that supports efficient system operation and process control.
For professionals seeking a durable, accurate, and easy-to-install low-pressure measuring instrument, the Ji Japsin Capsule Compound Gauge offers a dependable solution for precision industrial pressure monitoring.
Japsin Instrumentation – Since 1974
Reviews
There are no reviews yet.