This article was originally published on March 14, 2022 and updated on November 3, 2025.
Maintaining measurement accuracy in high-purity and cryogenic environments presents unique challenges. Pressure instruments in these systems are exposed to extreme temperatures, sensitive media and tight contamination controls that can quickly compromise their reliability.
To ensure safe, stable performance, pressure gauges in these settings must maintain purity, prevent leaks and withstand low-temperature conditions. High-purity gauges are engineered to meet these demands — providing precise readings and control in gas delivery systems, semiconductor production and other ultra-clean applications.
In this review, you will learn about the Ashcroft® HPS High-Purity Pressure Gauge with Reed Switch, including how it operates, its features and benefits and the specifications it has for measuring pressure in cryogenic applications and other high-purity processes.
HPS High-Purity Pressure Gauge with Reed Switch Overview
This high-purity pressure gauge with reed switch is designed for environments where maintaining process purity and consistent control is critical. It features an ultraclean design, helium leak testing and reed switch functionality, combining accurate pressure indication with electrical control capability in a compact 50 mm format.
Its stainless-steel construction and clean-room assembly ensure compatibility with high-purity gas delivery systems, gas cabinets, vacuum environments and cryogenic service where contamination control is essential.
Features and Benefits
Ultraclean Construction and Packaging
- Designed with stainless steel wetted components for high-purity and corrosive gas compatibility.
- Cleaned and assembled in a class 10,000 clean room, then nitrogen-flushed and polyethylene-sealed for contamination control.
- Packaged individually to maintain integrity until installation.
- Each gauge features a seven-digit serialized dial for full traceability.
Leak Integrity and Reliability
- 100% helium leak tested to 1×10⁻⁸ scc/s for absolute leak-tight performance.
- Fully welded construction eliminates potential leak paths to support ling-term stability
Integrated Reed Switch Functionality
- Combines pressure indication with a reed switch to trigger alarms or external controls when pressure reaches preset limits.
- Suited for low-pressure cylinder monitoring where uninterrupted gas flow is critical.
- Ideal for safety monitoring or automated shutoff in sensitive systems.
Compact, Durable Design
- Small 50 mm profile supports easy panel mounting in confined spaces.
- Built to perform consistently in applications that demand purity, cleanliness and reliability.
Cryogenic and High-Purity Performance
- Provides dependable operation under low-temperature and high-purity conditions.
- Helps protect your instruments from cryogenic applications by maintaining accuracy and preventing media contamination.
Typical Applications
- High-purity gas delivery systems
- Semiconductor manufacturing
- Process gas analyzers
- Gas sticks and gas panels
- Cylinder cabinets
- Exhaust gas monitoring for CVD and etching equipment
- Cryogenic and ultra-clean laboratory environments
Note: The HPS High-Purity Pressure Gauge with Reed Switch is designed for the gas portion of semiconductor and high-purity processes. It should not be used in ultrapure water systems, chemical delivery systems, or applications involving corrosive fluids.
Figure 1. Ashcroft® High Purity Pressure Gauge with Reed Switch Specifications
When to choose the High Purity Gauge with Reed Switch?
Select the HPS High-Purity Pressure Gauge with Reed Switch when your process demands reliable, contamination-free pressure monitoring and control in high-purity or cryogenic environments. Its combination of accurate indication, leak integrity and integrated switch capability makes it ideal for semiconductor, analytical and gas-handling systems where purity and safety cannot be compromised.
Ready to learn more?
Understanding how to measure pressure in temperature-sensitive applications while maintaining system purity is key to long-term performance. Learn more about Ashcroft’s high-purity pressure measurement solutions or contact our team to discuss your specific requirements.
If you want to learn more about pressure gauges that Ashcroft offers, you can check out the other product review blogs I’ve done:
- Product Review: HPT Pressure Gauge for Semiconductor Applications
- Product Review: 8008S Stainless Steel Pressure Gauge
- Product Review: 1032 Sanitary Pressure Gauge
Reach out today to talk to one of our industry experts and get all your pressure gauge questions answered. Or take a look at our guide: