ASHCROFT 451259SD04L30 Process Water Pressure Gauge 4-1/2 5RYA3

( Brand: Ashcroft ), ( Manufacturer Part Number: 451259SD04L30 ), ( Part Type: Pressure Gauge ), ( Face Diameter: 4.5 In ), ( Connection Diameter: 1/2 In ), ( Mounting Position: Side/bottom Mount ), ( Maximum Pressure: 30 Psi ), ( Country Of Origin: United States )

Review ASHCROFT New 4-1/2 Inch Process Pressure Gauge To 30 Psi #451259sd04l30

The **Ashcroft 451259SD04L30 4 " Process Pressure Gauge (30-5RYA3)** is a robust and precision-engineered instrument designed for demanding industrial applications where accurate, reliable pressure measurement is critical. Part of Ashcroft s renowned **4500 Series**, this gauge combines durability with high-performance features to ensure consistent performance in environments ranging from manufacturing plants to chemical processing facilities. With a **4 -inch (114.3 mm) dial face**, it provides a clear, easy-to-read display of pressure readings, making it ideal for operators who require quick and precise monitoring. The gauge is built to withstand harsh conditions, featuring a **cast iron case** for enhanced structural integrity and resistance to mechanical stress, while its **stainless steel bourdon tube** ensures long-term accuracy and corrosion resistance, even in corrosive or high-temperature environments.

This model is specifically designed for **process applications**, where stability and repeatability are essential. The **30-5RYA3** designation indicates a **30-inch water column (0-30 inWC) range**, making it suitable for low-pressure systems such as HVAC, pneumatic controls, or vacuum applications where precise differential or gauge pressure measurements are required. The **SD04** variant incorporates Ashcroft s **Sealed Dial** technology, which protects the internal components from contamination, moisture, and dust, thereby extending the gauge s lifespan and maintaining calibration integrity over time. Additionally, the **L30** suffix denotes a **long stem (30 mm)**, which allows for flexible installation options, accommodating various piping configurations without compromising readability.

Constructed with **high-quality materials**, including a **brass or stainless steel housing** (depending on the specific variant), this gauge is engineered to meet or exceed industry standards such as **ANSI B40.100** and **ISO 2281**, ensuring compatibility with most industrial pressure systems. The **black enamel dial** with **white Arabic numerals and graduations** provides excellent contrast for visibility, while the **anti-surge damping system** minimizes needle oscillation, delivering smoother, more accurate readings. For added safety, the gauge is equipped with a **safety seal** (optional, depending on configuration), which can be used to verify that the gauge has not been tampered with or recalibrated improperly.

Whether installed in a **cleanroom, food processing facility, or chemical plant**, the Ashcroft 451259SD04L30 excels in environments where **reliability, accuracy, and longevity** are non-negotiable. Its **sealed construction, corrosion-resistant components, and precise engineering** make it a trusted choice for engineers and technicians who demand nothing less than excellence in pressure measurement technology. With minimal maintenance requirements and a proven track record of performance, this gauge is an investment in operational efficiency and safety.

### **Pros and Cons of buying a Ashcroft 451259SD04L30 (4.5" Process Pressure Gauge, 30 PSI, 5RYA3)**

1. **Reliability and Durability** Ashcroft is a well-established brand known for high-quality instrumentation. This gauge is designed for industrial use, meaning it is built to withstand harsh environments, including temperature fluctuations, vibrations, and pressure cycles.

2. **Accurate and Precise Readings** The 4.5-inch dial provides a clear, easy-to-read display, reducing human error in monitoring pressure. The 5RYA3 series is known for its high accuracy, which is critical in applications requiring precise control (e.g., HVAC, manufacturing, or process industries).

3. **Wide Compatibility** The gauge is rated for **30 PSI (2 bar)**, making it suitable for low to moderate pressure systems. It can be adapted for various fluids (air, water, steam, or gases) with the correct connection (NPT, BSP, or other fittings) and diaphragm seal if needed.

4. **Easy Installation and Maintenance** Ashcroft gauges are designed for straightforward mounting (flanged, threaded, or welded) and typically require minimal maintenance. The **SD04L30** model likely includes a **sanitary or hygienic design**, which is beneficial in food, pharmaceutical, or beverage industries where cleanliness is paramount.

5. **Long Lifespan** High-quality materials (such as stainless steel or brass) and robust construction ensure longevity, reducing the need for frequent replacements.

6. **Backed by Warranty and Support** Ashcroft products often come with manufacturer warranties, and the brand has strong customer support, making troubleshooting and replacements easier if issues arise.

7. **Versatile Applications** Suitable for **process industries** (e.g., water treatment, HVAC, oil and gas, chemical processing) where consistent pressure monitoring is essential.

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1. **Higher Upfront Cost** Compared to generic or lower-end brands, Ashcroft gauges are more expensive. This may be a drawback for budget-conscious buyers or small-scale operations.

2. **Potential Overkill for Low-Pressure Systems** If the application only requires occasional or very low-pressure monitoring, a **simpler, less expensive gauge** might suffice. The **30 PSI rating** is moderate, and if higher pressures are needed, a different model may be necessary.

3. **Calibration Requirements** Like all precision instruments, this gauge may need **periodic calibration** to maintain accuracy, which could add to long-term costs if not performed in-house.

4. **Limited Customization** The **5RYA3** series has a standard design, meaning color, dial markings, or additional features (e.g., remote sensing) may require custom ordering, increasing lead times.

5. **Potential for Overuse in Simple Systems** For very basic applications (e.g., home plumbing or small-scale air compressors), a **cheaper analog or digital gauge** might be sufficient without the Ashcroft premium.

6. **Diaphragm Seal Dependency** If used with **corrosive or contaminated fluids**, a **diaphragm seal** may be required, adding complexity and cost.

7. **Replacement Parts Availability** While Ashcroft is reliable, **spare parts or replacement gauges** may take longer to source compared to more common brands.

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The **Ashcroft 451259SD04L30 (4.5" Process Pressure Gauge, 30 PSI, 5RYA3)** is an **excellent choice for industrial, commercial, or hygienic applications** where **accuracy, durability, and reliability** are critical. Its **high-quality construction, large dial, and compatibility with various systems** make it a strong investment for businesses that cannot afford inaccuracies or frequent failures.

However, for **budget-sensitive or low-pressure applications**, a **less expensive alternative** (e.g., a basic Ashcroft model, a different brand, or a digital gauge) may be more practical. If **long-term cost efficiency** is a concern, weigh the **initial expense against maintenance and calibration needs**.

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- You need **high precision and durability** in an **industrial, HVAC, or hygienic environment**.

- Your application requires **consistent pressure monitoring** (e.g., water treatment, food processing, or manufacturing).

- You can justify the **higher upfront cost** with **long-term reliability and reduced downtime**.

- Your budget is **strictly limited**, and a **simpler, cheaper gauge** will work.

- The application is **low-pressure or non-critical**, where a **basic analog or digital gauge** suffices.

- You require **custom features** (e.g., specific dial markings, remote sensing) that this model does not offer.

**Final Verdict:** For **serious industrial or process applications**, this Ashcroft gauge is a **strong, well-supported purchase**. For **casual or low-stakes use**, explore more affordable options first.

Details:

Ashcroft type 1259 vacuum gauge, 4 1/2 face, 316S Bordon'tube and socket, NPT bottom process connection. New in factory box. Box has some shelf wear.

part #: 451259sd04l30 prices

• $52.95-$155.49

specifications pressureswitchiz:

• brand: Ashcroft
• mpn: 451259sd04l30
• part type: Pressure Gauge
• face diameter: 4.5 In
• connection diameter: 1/2 In
• mounting position: Side/bottom Mount
• maximum pressure: 30 Psi
• country of origin: United States

seller pressureswitchiz:

• city: Reno, Nevada
• rating: 100.0%
• # reviews: 635

shipping pressureswitchiz:

• cost: $20.00
• carrier: UPS
• service: UPS Ground
• transit: 4-9 Days
• class: Standard
• type: Fixed

offer pressureswitchiz:

• options: Ship-to-home
• started: April 18, 2026
• quantity: 4
• availability: In Stock
• sold: 0
• best offers: True

payments pressureswitchiz:

• credit card: Mastercard
• other
• wallet: Paypal

general pressureswitchiz:

• condition: New
• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Air Pressure Gauges

returns pressureswitchiz:

• policy: No Returns

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