Description
“Ji” Japsin Instrumentation Economical Glycerin-Filled Pressure Gauge – 0 to 6 MPa, 4-Inch Dial, Bottom Entry
The “Ji” Japsin Instrumentation Economical Glycerin-Filled Pressure Gauge is designed for reliable pressure monitoring in industrial machinery, hydraulic systems, pumps, compressors, pipelines, and general process applications. Featuring a measuring range of 0 to 6 MPa ( 870 PSI), this pressure gauge provides clear and convenient pressure indication through its large 4-inch (100 mm) dial and dual-scale display.
The instrument is filled with glycerin to help reduce the effects of vibration and pressure pulsation on the pointer mechanism. This makes it suitable for applications where conventional dry pressure gauges may experience pointer fluctuations due to mechanical vibration or rapidly changing pressure conditions. The glycerin filling also provides lubrication to the internal moving components, helping support smoother pointer movement.
Manufactured with a stainless steel case and stainless steel wetted parts, the gauge is designed for use in compatible industrial environments. It features a case crimping-type construction, surface-mounting configuration, bottom-entry connection, and a 3/8-inch BSP male threaded process connection. These features make it a practical choice for equipment manufacturers, maintenance professionals, industrial buyers, and process operators looking for a glycerin-filled mechanical pressure indication instrument.
Key Features and Benefits
1. Glycerin-Filled Design for Vibration Dampening
One of the important features of this pressure gauge is its glycerin-filled construction. The liquid filling helps dampen pointer movement caused by mechanical vibration and pressure pulsation. This supports easier reading in installations where equipment vibration may otherwise cause the pointer to fluctuate.
Glycerin also lubricates the internal movement, helping reduce friction between moving components. The suitability of the liquid filling depends on the operating temperature and environmental conditions, so the gauge should be selected according to the manufacturer’s recommended limits.
2. Pressure Range of 0 to 6 MPa
The gauge is designed to measure positive pressure from 0 to 6 MPa, equivalent to 870 PSI. This range is suitable for compatible pressure-monitoring applications where the operating pressure falls within the instrument’s specified measuring range.
Selecting an appropriate pressure range is important for readability and instrument service life. The normal operating pressure should be considered when choosing a gauge, especially in systems where pressure spikes or pulsation may occur.
3. Dual-Scale Dial for Convenient Reading
The instrument features a dual-scale display with the primary scale in MPa and an additional scale in PSI. With a maximum range of 6 MPa and approximately 870 PSI, the gauge allows operators to read pressure in either unit.
This is useful in industrial facilities where equipment documentation, process requirements, and maintenance procedures may use different pressure units. The dual-scale arrangement reduces the need for manual unit conversion during routine inspections.
4. Large 4-Inch (100 mm) Dial
The 4-inch (100 mm) dial provides a larger viewing area for convenient pressure monitoring. It is suitable for installations where operators need to observe readings from a practical viewing distance, including machinery, pump assemblies, industrial equipment, and process installations.
The analog pointer display provides direct visual pressure indication, making it useful for routine equipment checks and maintenance inspections.
5. Stainless Steel Case Construction
The pressure gauge features a stainless steel case with crimping-type construction. The case houses and protects the internal measuring mechanism and glycerin filling.
Stainless steel is commonly used in industrial instrumentation because of its durability and suitability for many general industrial environments. The actual suitability of the case depends on the installation environment, including moisture, corrosive exposure, cleaning chemicals, and operating conditions.
6. Stainless Steel Wetted Parts
The wetted parts are manufactured from stainless steel and are in contact with the process medium. Stainless steel construction is commonly selected for pressure instruments used in industrial applications where material durability and corrosion resistance are important.
However, compatibility depends on the nature of the process fluid, its concentration, temperature, and other operating conditions. Always verify the wetted material’s suitability for the intended medium before installation.
7. Surface Mounting with Bottom Entry
The instrument features a surface-mounting configuration with a bottom-entry process connection. This arrangement allows the gauge to be mounted on a suitable surface or equipment panel while the pressure connection extends from the bottom of the dial.
The configuration is useful for installations where the gauge needs to be positioned for front-facing visibility and connected to a pressure line below the instrument.
8. 3/8-Inch BSP Male Connection
The gauge is equipped with a 3/8-inch BSP male threaded connection for connection to compatible pressure lines, fittings, and process connections. Before installation, confirm that the mating connection matches the gauge’s thread specification and size.
Correct thread matching, suitable sealing practices, and proper installation help reduce the risk of leakage and support dependable operation.
Working Principle of a Glycerin-Filled Pressure Gauge
The pressure gauge generally operates using a Bourdon tube measuring element. When process pressure enters the instrument through the bottom connection, the Bourdon tube responds to the applied pressure by changing its shape. This movement is transferred through a mechanical linkage and gear mechanism to the pointer, which indicates the corresponding pressure value on the dial.
The glycerin filling helps dampen mechanical movement and pointer oscillations caused by vibration and pressure pulsation. This allows operators to observe readings more easily in compatible operating environments.
As a mechanical instrument, the gauge does not require an external electrical power supply for pressure indication.
Industrial Applications
The “Ji” Japsin Instrumentation Economical Glycerin-Filled Pressure Gauge can be considered for various industrial applications, including:
- Hydraulic systems: Monitoring pressure in compatible hydraulic equipment and circuits.
- Water pumps: Observing operating pressure in pumping systems.
- Air compressors: Monitoring pressure in suitable compressed-air applications.
- Industrial machinery: Providing local pressure indication on equipment and assemblies.
- Process pipelines: Checking pressure at selected measurement points.
- Manufacturing plants: Supporting routine process monitoring and maintenance inspections.
- General engineering: Pressure indication in compatible industrial equipment and utility systems.
The gauge should be selected according to the process medium, operating pressure, temperature, vibration level, and installation requirements.
Installation and Maintenance Recommendations
Install the gauge in a location where the dial is clearly visible and accessible for inspection. Ensure that the mounting surface is suitable for the instrument and that the bottom-entry connection is correctly aligned with the pressure line.
Before installation, verify the 3/8-inch BSP male thread compatibility. Avoid applying excessive tightening force to the gauge case. Use suitable connection and sealing practices for the application.
For systems with significant pressure pulsation, pressure spikes, or vibration, confirm that the instrument’s pressure range and glycerin filling are appropriate for the operating conditions. Periodically inspect the gauge for leakage, case damage, pointer irregularities, and changes in the liquid filling.
For critical processes, follow an appropriate inspection and calibration schedule based on plant requirements and the manufacturer’s recommendations.
Why Choose “Ji” Japsin Instrumentation?
Japsin Instrumentation supplies pressure and temperature measurement instruments for industrial process monitoring applications. The “Ji” Economical Glycerin-Filled Pressure Gauge combines a 0 to 6 MPa measuring range, dual-scale indication, 4-inch dial, stainless steel construction, and glycerin-filled design in a practical mechanical pressure instrument.
Its surface-mounting bottom-entry arrangement makes it suitable for compatible equipment and installations where a front-facing pressure display is required. The glycerin filling helps improve pointer stability in applications subject to vibration and pressure pulsation.
Choose the “Ji” Japsin Instrumentation Economical Glycerin-Filled Pressure Gauge for convenient local pressure monitoring in suitable industrial systems.
Japsin Instrumentation – Since 1974
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