In industrial systems, accurate pressure measurement in chemical environments, high-viscosity fluids, or corrosive media is always a challenge for conventional pressure gauges. The Wise Diaphragm Seal Pressure Gauge is a dedicated pressure measurement solution that completely isolates the process medium from the measuring mechanism, ensuring measurement accuracy, extending instrument service life, and maintaining system reliability.

As one of the leading instrumentation manufacturers in South Korea, Wise Control Inc. offers a comprehensive range of diaphragm seal pressure gauges with various connection types and construction materials to satisfy the demanding requirements of the chemical, food and beverage, pharmaceutical, water treatment, oil & gas, and many other industrial applications.

The Wise Diaphragm Seal Pressure Gauge product lineup includes the P710, P720, and P730 models, providing reliable pressure measurement solutions for various piping configurations and operating conditions.

1. What is a Diaphragm Seal Pressure Gauge?

A Wise Diaphragm Seal Pressure Gauge is a pressure measuring instrument that utilizes a diaphragm seal together with a pressure-transmitting fluid to transmit the process pressure from the process medium to the pressure gauge measuring mechanism without allowing the process medium to come into direct contact with the gauge.

This design protects the pressure gauge from aggressive process media while maintaining measurement accuracy over an extended service life.

The Wise Diaphragm Seal Pressure Gauge is used when the process medium is:

• Corrosive.
• Highly viscous.
• Containing suspended solids or solid particles.
• Prone to crystallization.
• Requiring sanitary conditions.
• Likely to clog the pressure connection.

Thanks to its complete isolation of the process medium, the Wise Diaphragm Seal Pressure Gauge has become a widely used solution in modern industrial pressure measurement systems.

2. Operating Principle

The operating principle of the Wise Diaphragm Seal Pressure Gauge is based on pressure transmission through a pressure-transmitting fluid sealed inside the diaphragm assembly.

When the process pressure acts on the diaphragm, the pressure is transmitted through silicone oil to the pressure gauge measuring element. This pressure transmission process is continuous and accurate, allowing the gauge to indicate the actual pressure while preventing the process medium from coming into direct contact with the measuring mechanism.

This operating mechanism provides several advantages:

• Completely isolates the process medium from the pressure gauge.
• Protects the measuring mechanism from chemicals and contaminants.
• Reduces the risk of instrument damage.
• Maintains measurement stability and accuracy.
• Extends the service life of the pressure gauge.

3. Main Technical Specifications

The Wise Diaphragm Seal Pressure Gauge series is designed to satisfy a wide range of industrial pressure measurement requirements with the following specifications.

Pressure Ranges

• –0.1 to 0 / –0.1 to 2.5 MPa
• 0 to 0.1 / 0 to 35 MPa

In addition to MPa, the gauges are also available in other pressure units such as bar, kPa, or other units upon request.

Pressure Transmitting Fluid

• Silicone Oil

Operating Temperature

Ambient Temperature

• –20 to 65°C (Glycerin-filled gauge)
• –40 to 65°C (Silicone oil-filled gauge)

Process Temperature

• Maximum 100°C

Temperature Error

• ±0.5% of full scale for every 10°C deviation from the reference temperature of 20°C.

Diaphragm Material

Wise provides a wide selection of corrosion-resistant diaphragm materials to suit different process media and operating conditions.

The selection of the diaphragm material and pressure-transmitting fluid should be based on the characteristics of the process medium to ensure long-term durability and measurement accuracy.

4. Construction Materials

One of the major advantages of the Wise Diaphragm Seal Pressure Gauge is the availability of various construction materials to meet different corrosion resistance and durability requirements.

Diaphragm Materials

• 316L Stainless Steel
• Monel
• Hastelloy C
• Titanium
• Tantalum
• Nickel
• Alloy 20

Gauge Side Flange Materials

• 304 Stainless Steel
• 316 Stainless Steel
• Titanium

Process Side Flange Materials

• 304 / 304L Stainless Steel
• 316 / 316L Stainless Steel
• Monel
• Hastelloy C
• Titanium
• Nickel

Selecting the appropriate construction material significantly improves equipment service life while ensuring reliable operation in highly corrosive environments.

5. Product Lineup

Wise offers multiple diaphragm seal configurations to meet a wide variety of industrial installation requirements.

Model P710 – Screwed Connection

The Wise P710 features a threaded connection and is suitable for small piping systems operating at low to medium pressures. Its compact design allows convenient installation and maintenance.

Model P720 – “I” Type Connection

The Wise P720 features an I-Type connection, providing a rigid construction suitable for standard industrial applications.

Model P730 – Flat Flange Connection

The Wise P730 utilizes a flat flange connection in accordance with ANSI or JIS standards, making it suitable for large piping systems, high-pressure applications, and harsh operating environments.

6. Configuration Options

To satisfy special operating requirements, the Wise Diaphragm Seal Pressure Gauge offers numerous configuration options, including:

• PTFE Coating or PTFE Lining.
• Glycerin-filled or Silicone oil-filled pressure gauge.
• Flushing Ring.
• Purging Plug.
• Heating Jacket or Cooling Jacket.
• PVC Jacketed Capillary Tube.

In addition to these standard options, Wise also provides customized selections of diaphragm materials, flange materials, and pressure-transmitting fluids according to the characteristics of the process medium, allowing maximum flexibility for various industrial systems.

7. Applications

The Wise Diaphragm Seal Pressure Gauge is widely used in numerous industrial applications, particularly where aggressive or difficult process media are present.

Typical applications include:

• Chemical plants.
• Food and beverage processing plants.
• Pharmaceutical manufacturing facilities.
• Steam systems.
• Water treatment systems.
• Power plants.
• Cement plants.
• Oil and gas industries.

The instrument is particularly effective in applications involving highly viscous media, media containing solid particles, or media susceptible to crystallization, where conventional pressure gauges cannot operate reliably.

8. Key Advantages

Compared with conventional pressure gauges, the Wise Diaphragm Seal Pressure Gauge offers numerous advantages, including:

• Complete isolation of the process medium from the measuring mechanism.
• Protection of the pressure gauge against corrosive media.
• Prevention of pressure connection clogging.
• Long service life.
• Excellent measurement stability.
• Wide selection of construction materials.
• Suitable for harsh industrial environments.
• Easy maintenance.

These advantages make the Wise Diaphragm Seal Pressure Gauge a reliable pressure measurement solution for industrial systems requiring high accuracy and long-term durability.

9. Ordering Information

To select the appropriate Wise Diaphragm Seal Pressure Gauge, the following information should be specified:

• Model (P711 / P712 / P721 / P722 / P731 / P732)
• Connection type
• Diaphragm material
• Flange material
• Pressure unit
• Pressure range
• Optional accessories

Selecting the appropriate configuration ensures stable operation, accurate pressure measurement, and extended service life throughout the operating period.

The Wise Diaphragm Seal Pressure Gauge is a professional pressure measurement solution for industrial systems handling aggressive process media. Featuring a diaphragm seal design, a wide selection of corrosion-resistant materials, and flexible configuration options, the Wise P710, P720, and P730 models effectively satisfy pressure measurement requirements across a broad range of industries while improving system reliability, operational safety, and overall process efficiency.