The Ultimate Guide to Rear Mount Pressure Gauges: Selection, Installation, and Maintenance

In the world of industrial instrumentation, selecting the right pressure gauge is critical for safety, accuracy, and system longevity. Among the various mounting configurations, the Rear Mount Pressure Gauge stands out for its unique advantages in specific applications. This comprehensive guide will walk you through everything you need to know about rear-mount gauges, from choosing the perfect model to ensuring its reliable performance for years to come.

What is a Rear Mount Pressure Gauge?

Unlike traditional bottom or lower mount gauges, a rear mount pressure gauge features its connection point at the back of the case. This design allows the dial to face directly forward when the process connection is mounted flush to a panel, tank, or piece of equipment. This configuration is ideal for applications where space is limited in front of the mounting surface or where a streamlined, flush-mounted appearance is desired for control panels and machinery.

Key Benefits and Typical Applications

The primary benefit of a rear connection pressure gauge is its space-saving profile. It protrudes minimally from the mounting surface, reducing the risk of accidental impact damage. This makes them perfect for:

• Control Panels and Consoles: Providing a clean, integrated look.

• HVAC Systems: For monitoring refrigerant or water pressure.

• Hydraulic and Pneumatic Systems: Where equipment is mounted on walls or within enclosures.

• OEM Machinery: Where design compactness is a priority.

How to Select the Right Rear Mount Gauge

Choosing the correct gauge involves more than just the mounting style. Consider these critical factors to ensure optimal performance and durability.

Pressure Range and Media Compatibility

Always select a gauge with a range where the normal operating pressure falls at the midpoint (50-75%) of the scale. This ensures the best accuracy and reduces stress on the internal mechanism. Furthermore, the gauge’s wetted parts (like the bourdon tube and socket) must be compatible with the media being measured—whether it’s air, water, oil, or a corrosive chemical—to prevent failure.

Case Size, Material, and Accuracy Class

Case size (common sizes are 63mm or 100mm) depends on your visibility requirements and panel space. Cases can be made from stainless steel for harsh environments or plastic for general-purpose use. The accuracy class (e.g., ASME B40.1 Grade B ±1.6%) dictates how precise the readings are, which is vital for critical processes.

Step-by-Step Installation Best Practices

Proper installation is key to gauge longevity and accurate readings. Incorrect installation is a leading cause of premature gauge failure.

1. Shut Down and Depressurize the system completely before beginning.

2. Use a Sealant on the threads, such as PTFE tape, appropriate for the system media. Avoid overtightening.

3. Consider a Pulsation Damper or Snubber if the system experiences vibration or pressure spikes, which can quickly destroy a gauge’s internal movement.

4. Mount the Gauge Securely