The Stevens Model 311 series is a well-regarded line of pressure gauges, known for their reliability and accuracy in various industrial applications. A key specification often referenced is the "H-value," which represents the case size of the gauge. Understanding this H-value is crucial for selecting the appropriate gauge for your specific needs. This guide will delve into the significance of the H-value in the Stevens Model 311 series and how it relates to other gauge characteristics.
What Does the "H" in Stevens Model 311 Series H-Value Represent?
In the context of the Stevens Model 311 series pressure gauges, the letter "H" preceding the numerical value (e.g., H40, H60) denotes the case diameter of the gauge in millimeters. Therefore, an H40 gauge has a case diameter of 40mm, while an H60 gauge has a case diameter of 60mm. This simple designation immediately tells you the physical size of the pressure gauge.
Why is the H-Value Important?
The H-value, representing the case size, is critical for several reasons:
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Physical Fit: The most obvious reason is ensuring the gauge fits into its intended location. A smaller gauge (e.g., H40) will fit in tighter spaces compared to a larger gauge (e.g., H60). This is essential for panel mounting and integration within existing systems.
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Readability: Larger case sizes generally offer larger dials and more easily readable markings. This is vital for applications where quick and accurate pressure readings are necessary, particularly in situations with limited visibility or in environments with low ambient light.
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Durability: While not directly proportional, larger case sizes often imply a more robust construction, potentially offering better resistance to shock and vibration. The increased size may also accommodate thicker gauge materials, enhancing overall durability.
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Mounting: The H-value impacts the mounting style. Larger gauges might necessitate specific mounting hardware or brackets, unlike smaller gauges, which are sometimes simpler to install.
Relationship Between H-Value and Other Specifications
The H-value is not independent of other Stevens Model 311 specifications. It indirectly influences other characteristics:
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Pressure Range: While not directly linked, certain H-values might be more commonly associated with specific pressure ranges due to manufacturing constraints and application requirements. Larger gauges might be used for higher pressure applications simply for increased readability and possibly improved durability.
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Accuracy Class: The accuracy class of the gauge usually remains independent of the H-value, but the larger gauge face can potentially make minor deviations easier to discern.
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Connection Type: The connection type (e.g., bottom, back, or side) remains independent of the H-value, and the specific type should be considered separately during the selection process.
Selecting the Right Stevens Model 311 Gauge: Considerations Beyond the H-Value
Choosing a Stevens Model 311 pressure gauge involves several considerations beyond the H-value:
1. Pressure Range:
Determine the maximum and minimum pressure values you need to monitor.
2. Accuracy Class:
Select the accuracy class that meets your application's precision needs.
3. Connection Type:
Choose a connection type compatible with your system's piping and fittings.
4. Fill Fluid:
Consider the fill fluid type for optimal performance and longevity.
5. Case Material:
Select a suitable case material based on environmental conditions.
By carefully considering these factors in conjunction with the H-value (case size), you can ensure that you choose the perfect Stevens Model 311 series pressure gauge for your application. Remember to consult the official Stevens Instruments documentation for detailed specifications and compatibility information. Always prioritize safety when handling and installing pressure gauges.
