Description
“Ji” Japsin Instrumentation Economical Compound Gauge – Glycerin Filled, 2.5 Inch Dial
The “Ji” Japsin Instrumentation Economical Compound Gauge is a practical mechanical pressure and vacuum measuring instrument designed for applications where both positive pressure and vacuum measurement are required from a single dial gauge. With a 2 1/2-inch (63 mm) dial, glycerin-filled construction, stainless steel casing, and stainless steel wetted parts, this compound gauge provides a clear and durable solution for monitoring pressure conditions across a wide range of industrial and general-purpose applications.
The gauge features a combined measurement range of -15 inHg to 15 Bar, allowing users to monitor vacuum conditions as well as positive pressure. A dual scale of -10 to 22 PSI is also provided for convenient pressure reference. This combination makes the gauge suitable for systems where pressure may fluctuate between vacuum and positive-pressure conditions.
Designed with a direct mounting bottom-entry configuration, the gauge can be installed directly into a compatible pressure connection located below the instrument. The 1/2″ BSP male connection provides a commonly used threaded interface for installation in compatible piping, machinery, vessels, pumps, compressors, and process equipment.
Compound Pressure and Vacuum Measurement
Unlike a conventional pressure gauge that measures only positive pressure, a compound gauge is designed to indicate both vacuum and positive pressure. The “Ji” Japsin Instrumentation Compound Gauge provides a measurement range from -15 inHg vacuum to 15 Bar pressure.
This makes it particularly useful in applications where a system can operate under vacuum during one stage and positive pressure during another. Users can monitor both conditions using a single mechanical dial instrument, reducing the need for separate vacuum and pressure gauges.
Typical applications include suction systems, pumps, compressors, vacuum equipment, refrigeration-related systems, process equipment, and other machinery where pressure conditions can cross between vacuum and positive pressure.
Glycerin-Filled Construction
The gauge is glycerin filled, which is beneficial for applications where vibration, pulsation, or mechanical movement can make pointer observation difficult.
The liquid filling helps dampen pointer movement caused by pressure pulsation and vibration, allowing the displayed reading to be easier to observe. It can also help reduce the effects of mechanical movement within the gauge during demanding operating conditions.
Glycerin-filled gauges are commonly selected for pumps, compressors, machinery, hydraulic systems, and other applications where the pressure being measured may fluctuate.
2.5-Inch (63 mm) Dial
The gauge incorporates a 2.5-inch (63 mm) dial, providing a compact format while maintaining a practical viewing area for local pressure indication.
The dial incorporates the specified compound pressure/vacuum range along with the additional pressure scale. This allows operators to quickly identify whether the system is operating under vacuum or positive pressure.
The relatively compact dial size also makes the gauge suitable for equipment panels and installations where available mounting space is limited.
Stainless Steel Case and Wetted Parts
The instrument features an SS case and SS wetted parts, providing a durable construction for a wide variety of industrial and general-purpose pressure-monitoring applications.
The stainless steel casing provides a robust exterior enclosure, while stainless steel wetted components provide a suitable material choice for applications requiring corrosion-resistant pressure-contact components.
Actual material compatibility should always be checked against the process medium, temperature, pressure, and environmental conditions before installation.
Direct Bottom Entry Mounting
The gauge is designed with direct mounting and bottom entry. The process connection is positioned at the bottom of the gauge, allowing the instrument to be installed directly into a compatible threaded connection.
The 1/2″ BSP (M) male connection provides a standard threaded mounting interface for suitable piping and equipment.
The installation point should be appropriately prepared and the thread type should be verified before installation. Correct sealing and proper tightening procedures should be followed to help prevent leakage or damage to the connection.
Crimping-Type Case Design
The gauge uses a case crimping type construction. The crimped case design provides a practical enclosure arrangement for the mechanical gauge and contributes to the compact and economical construction of the instrument.
This makes the gauge suitable for applications where a dependable local pressure/vacuum indication is required without the complexity of an electronic pressure transmitter or digital display.
Key Features
- Compound pressure and vacuum gauge for measuring both vacuum and positive pressure.
- Glycerin-filled construction for improved pointer stability in vibrating or pulsating applications.
- 2.5-inch (63 mm) dial for clear local indication.
- Measurement range of -15 inHg to 15 Bar.
- Additional dual scale of -10 to 22 PSI.
- Direct mounting, bottom-entry configuration.
- 1/2″ BSP (M) process connection.
- Stainless steel case for durable external construction.
- Stainless steel wetted parts.
- Case crimping type design.
- Mechanical operation with no external electrical power required.
- Suitable for a wide range of pressure, vacuum, pump, compressor, and process applications.
Applications
The “Ji” Japsin Instrumentation Economical Compound Gauge can be used for local pressure and vacuum monitoring in:
- Pumps and suction systems
- Vacuum pumps and vacuum equipment
- Compressors
- Hydraulic and pneumatic systems
- Process machinery
- Industrial equipment
- Pressure and vacuum lines
- Refrigeration and cooling equipment, where the specified materials and range are suitable
- Water and utility systems
- General industrial pressure monitoring
- Machinery requiring combined vacuum and pressure indication
Installation and Usage Considerations
Before installation, confirm that the gauge’s pressure range, vacuum range, process connection, wetted-part materials, and operating conditions are suitable for the intended application.
The pressure connection should be installed using an appropriate compatible sealing method. Avoid applying excessive torque directly to the gauge case. Where severe vibration or pressure pulsation exists, suitable installation practices should be followed to protect the instrument and maintain readable indication.
The gauge should not be exposed to pressure exceeding its specified operating range. The process medium should also be compatible with the stainless steel wetted components.
Product Summary
The “Ji” Japsin Instrumentation Economical Compound Gauge is a compact and versatile solution for applications requiring both vacuum and positive-pressure measurement. Its -15 inHg to 15 Bar range, additional -10 to 22 PSI scale, 2.5-inch (63 mm) dial, glycerin-filled construction, stainless steel case and wetted parts, bottom-entry direct mounting, and 1/2″ BSP male connection make it suitable for a broad range of industrial and general-purpose pressure-monitoring requirements.
By combining vacuum and pressure indication in one mechanical instrument, this compound gauge provides a convenient and economical method of monitoring changing pressure conditions in pumps, compressors, vacuum systems, machinery, and process equipment.
Japsin Instrumentation – Since 1974
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