Description
“Ji” Japsin Instrumentation Compound Gauge – Dial Size 2½” (63 mm) | Range -760 mmHg to 2.1 Kg/cm² | Dual Scale -30 inHg to 30 PSI | Direct Mounting Bottom Entry | 1/4″ BSP (M) Connection | MS Case & Brass Internals
The “Ji” Japsin Instrumentation Compound Gauge is a versatile pressure measuring instrument designed to monitor both vacuum and positive pressure in industrial systems. With a dial size of 2½ inches (63 mm) and a measurement range from -760 mmHg to 2.1 Kg/cm², the gauge provides reliable performance in applications where pressure conditions vary between vacuum and pressure states.
This compound gauge is equipped with a dual scale display of -30 inHg to 30 PSI, allowing operators to read pressure values in multiple units depending on the system requirements. The compact design, durable construction, and accurate pressure indication make this instrument suitable for a wide range of industrial environments, including compressors, pumps, HVAC systems, laboratories, and process industries.
The gauge features a direct mounting bottom entry configuration with a 1/4″ BSP (Male) threaded connection, ensuring easy installation in pipelines, machinery, and process equipment. Built with a mild steel (MS) case and brass internals, the instrument delivers reliable performance while maintaining cost-effective construction suitable for general industrial applications.
Understanding Compound Pressure Gauges
A compound gauge is a type of pressure gauge designed to measure both vacuum pressure and positive pressure within a single instrument. Unlike standard pressure gauges that measure only positive pressure, compound gauges allow operators to monitor systems that transition between vacuum and pressure conditions.
This capability makes compound gauges particularly useful in applications such as:
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Vacuum pumps
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Refrigeration systems
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Compressors
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Air handling systems
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Process equipment
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Laboratory testing equipment
The ability to monitor both pressure states helps technicians and engineers maintain system stability and detect abnormal pressure fluctuations.
Compact and Practical Dial Design
The 2½-inch (63 mm) dial size provides a compact and practical solution for applications where space is limited. Despite its smaller size, the gauge offers clear and easy-to-read scale markings, allowing operators to quickly interpret pressure readings.
The dial is designed with a white background and high-contrast markings, which improves visibility and ensures accurate reading even under varying lighting conditions. A balanced pointer moves smoothly across the scale, indicating pressure changes in real time.
This compact dial size is particularly useful for portable equipment, small machinery, laboratory setups, and panel-mounted systems where larger gauges may not be suitable.
Wide Measurement Range
The Ji Japsin Compound Gauge features a measurement range from -760 mmHg to 2.1 Kg/cm², enabling it to handle both vacuum and moderate pressure applications effectively.
The vacuum range (-760 mmHg) represents a full vacuum measurement capability, allowing the gauge to monitor vacuum systems accurately. At the same time, the positive pressure range up to 2.1 Kg/cm² provides sufficient capacity for many industrial processes involving gases and liquids.
This dual capability ensures that the instrument can monitor systems that operate under variable pressure conditions without requiring separate gauges for vacuum and pressure measurement.
Dual Scale Display for Versatility
To improve usability across different industries and international measurement standards, the compound gauge features a dual scale display.
The scale includes:
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-30 inHg to 30 PSI
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Equivalent vacuum and pressure measurement values
This dual-scale design enables operators to read pressure values in the unit that best suits their operational standards. Many industrial systems use PSI units, while vacuum systems may require inHg readings. By providing both measurement units on the same dial, the gauge improves convenience and operational flexibility.
Direct Mounting Bottom Entry Configuration
The gauge is designed with a direct mounting bottom entry configuration, which is one of the most widely used installation styles in industrial pressure measurement systems.
In this configuration, the process connection is located at the bottom of the gauge, allowing it to be directly mounted onto pipelines, pressure ports, or equipment connections. This design ensures a stable and secure installation while keeping the dial visible for easy monitoring.
Bottom entry mounting is commonly used in:
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Compressors
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Pumps
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Hydraulic systems
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Air pressure systems
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Laboratory equipment
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Process machinery
The simple installation design reduces setup time and allows the gauge to be integrated into existing systems with minimal modification.
Standard 1/4″ BSP (Male) Process Connection
The compound gauge features a 1/4-inch BSP (Male) threaded connection, which is a widely used standard in industrial instrumentation.
This threaded connection ensures compatibility with many existing pressure ports and fittings used in industrial machinery, HVAC systems, and fluid control equipment. The secure threaded design provides a tight seal, preventing leakage while maintaining accurate pressure transmission to the gauge mechanism.
The standardization of the connection size allows technicians to quickly replace or install the gauge without requiring special adapters or fittings.
Durable Mild Steel Case Construction
The gauge housing is constructed with a mild steel (MS) case, which provides mechanical strength and protection for the internal measuring components. The case shields the gauge mechanism from external damage caused by vibration, impact, and environmental exposure.
The MS case is designed to maintain structural stability while keeping the overall instrument weight manageable. This construction helps extend the operational life of the gauge and ensures dependable performance under general industrial conditions.
Brass Internal Components
Inside the gauge, the measuring mechanism consists of brass internals, which provide good corrosion resistance and reliable mechanical performance. Brass is commonly used in pressure gauge mechanisms because it offers a balance between durability, machinability, and resistance to many non-corrosive media.
The brass internal components are compatible with common process media such as:
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Air
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Water
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Non-corrosive gases
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Light industrial fluids
These materials help ensure stable pressure measurement and consistent instrument performance over time.
Reliable Bourdon Tube Mechanism
The Ji Japsin Compound Gauge operates using a Bourdon tube pressure sensing mechanism, a proven technology widely used in industrial pressure measurement instruments.
In this mechanism:
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Pressure enters the gauge through the process connection.
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The Bourdon tube element reacts to pressure changes by slightly deforming.
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This mechanical movement is transferred to the pointer through a linkage mechanism.
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The pointer moves across the dial to indicate the corresponding pressure value.
The Bourdon tube mechanism is valued for its simplicity, durability, and consistent accuracy, making it suitable for a wide range of industrial environments.
Clear Visibility and Easy Monitoring
One of the key advantages of this compound gauge is its clear dial visibility, which allows operators to quickly assess system pressure conditions.
The dial features:
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High-contrast scale markings
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Balanced pointer movement
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Easy-to-read pressure units
This design helps reduce operator errors and improves the efficiency of routine monitoring tasks in industrial facilities.
Applications Across Multiple Industries
The Ji Japsin Compound Gauge is widely used in industries where both vacuum and pressure monitoring are required. Its compact design and versatile measurement capability make it suitable for various industrial applications.
Typical applications include:
Vacuum Systems
The gauge is commonly used in vacuum pumps and vacuum chambers to monitor system vacuum levels during operation.
Compressor Systems
Air compressors often experience pressure fluctuations during operation. A compound gauge helps monitor both pressure buildup and vacuum conditions in the system.
HVAC Systems
Heating, ventilation, and air conditioning systems require accurate monitoring of air pressure and vacuum conditions for optimal performance.
Laboratory Equipment
Laboratory instruments often require precise pressure and vacuum monitoring, making compound gauges useful in research and testing environments.
Refrigeration Systems
Refrigeration and cooling systems operate under both vacuum and pressure conditions during charging and maintenance processes.
Industrial Machinery
Many types of industrial machinery use compound gauges to monitor pressure changes within hydraulic and pneumatic systems.
Advantages of the “Ji” Japsin Compound Gauge
This compound gauge provides several operational advantages for industrial users:
Dual functionality
Measures both vacuum and positive pressure with a single instrument.
Compact design
The 63 mm dial size allows installation in small spaces and compact equipment.
Dual scale display
Provides measurement flexibility using both inHg and PSI units.
Durable construction
MS case and brass internals ensure reliable operation in industrial environments.
Standard process connection
1/4″ BSP connection allows easy installation in most pressure systems.
Reliable measurement mechanism
The Bourdon tube mechanism ensures stable and consistent pressure readings.
Quality and Performance
“Ji” Japsin Instrumentation is known for producing reliable industrial measurement instruments designed to meet practical operational requirements. Each compound gauge is manufactured with attention to detail, ensuring accurate measurement and dependable performance.
The combination of durable materials, precision mechanical components, and clear dial design makes this compound gauge a practical solution for many industrial applications.
Conclusion
The “Ji” Japsin Instrumentation Compound Gauge (2½” Dial, -760 mmHg to 2.1 Kg/cm²) is a reliable and versatile instrument designed for systems that operate under both vacuum and pressure conditions. Its dual scale display, compact design, durable MS case, brass internals, and standard 1/4″ BSP connection make it suitable for a wide range of industrial applications.
Whether used in vacuum pumps, compressors, HVAC systems, laboratories, or industrial machinery, this compound gauge provides clear pressure monitoring and dependable performance. Its practical design and durable construction make it an essential instrument for maintaining system stability and operational safety in modern industrial environments.
Japsin Instrumentation – Since 1974
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