diagram diaphragm gauges provide reliable, low-range measurements for air, water, and non-corrosive gases. This article highlights five diaphragm-type capsule gauges designed for low-pressure tasks, offering accuracy, durable construction, and easy installation. Each option is suitable for non-corrosive media and features a 2-1/2″ dial with a 1/4″ NPT lower mount or comparable connection. Read on for concise details and practical buying tips.
| Product | Dial | Pressure Range | Mount | Main Use |
|---|---|---|---|---|
| MEASUREMAN Diaphragm Type Capsule Low Pressure Gauge (0-5 PSI) | 2-1/2″ | 0-5 psi | 1/4″ NPT Lower Mount | Air, water, non-corrosive media |
| MEASUREMAN Diaphragm Type Capsule (0-15 in H2O) | 2-1/2″ | 0-15 in H2O | 1/4″ NPT Lower Mount | Low-pressure air and water readings |
| MEASUREMAN Diaphragm Type Capsule (0-3 psi) | 2-1/2″ | 0-3 psi | 1/4″ NPT Lower Mount | Low-pressure measurement |
| CARBO Instruments Diaphragm Low Pressure (0-8 oz / 0-15 inH2O) | 2-1/2″ | 0-8 oz / 0-15 inH2O | 1/4″ NPT Lower Mount | LP gases, water, air |
| GOATACURA 0-5 psi Diaphragm Gauge | 2-1/2″ | 0-5 psi | 1/4″ NPT Lower Mount | Water, air, non-corrosive fluids |
Below are five diaphragm-type gauges tailored for precise, low-pressure measurement. Each entry includes a brief overview, key features, and practical installation notes to help you compare at a glance without sacrificing depth.
MEASUREMAN 0-5 PSI Diaphragm Gauge
The 0-5 psi model from MEASUREMAN uses a diaphragm-type capsule design for stable readings in low-pressure systems. Its 2-1/2″ dial provides clear visibility, while the 1/4″ NPT lower mount ensures easy installation in compact layouts. Suitable for air, water, and non-corrosive media that do not damage copper alloy parts. The gauge is adjustable for zero setting to maintain accuracy over time.
MEASUREMAN 0-15 in H2O Diaphragm Gauge
Designed for inches of water readings, this MEASUREMAN gauge shares a robust diaphragm capsule with a 2-1/2″ dial and 1/4″ NPT lower mount. It’s optimized for non-corrosive media and provides precise 0-15 in H2O measurements, making it suitable for small HVAC, lab, or testing setups where fine pressure differences matter.
MEASUREMAN 3 PSI Diaphragm Gauge
This model offers a 0-3 psi range with the same 2-1/2″ dial and 1/4″ NPT lower mount. It is suited for measuring low-pressure air or non-corrosive fluids. The diaphragm capsule design helps stabilize readings in fluctuating conditions, and the adjustable zero screw allows fine-tuning for long-term accuracy.
CARBO Instruments 3 PSI Low-Pressure Gauge
The CARBO Instruments gauge combines a 2-1/2″ dial with a 1/4″ NPT lower mount in a chrome steel case and brass internals. It supports multiple non-viscous media that are not corrosive to copper alloys. The device is designed for high-accuracy LP and NG gas readings and features a removable plastic lens for easy viewing and cleaning.
GOATACURA 0-5 psi Diaphragm Gauge
GOATACURA’s 0-5 psi model emphasizes robust construction with a black steel case and a beryllium diaphragm type capsule for stable, accurate readings. It features a 2-1/2″ dial and a 1/4″ NPT lower mount, designed for low-pressure measurement in liquids and gases that won’t corrode brass parts. The gauge is built for reliable operation in compact installations and can handle water and air systems effectively.
MEANLIN MEASURE 0-5 Psi, 2-1/3″ Dial Back Mount
MEANLIN MEASURE offers a 0-5 psi diaphragm gauge with a 2-1/3″ dial, back-mount installation, and 1/4″ NPT configuration. The unit uses a black steel frame with chrome-plated components and a brass diaphragm for stable readings in low-pressure environments. It is suitable for air, water, and non-corrosive media, and provides adjustable zero for ongoing accuracy.
Buying Guide: Key Purchase Considerations
- Pressure range: Match the gauge range to the maximum expected pressure to ensure accuracy.
- Dial size: A 2-1/2″ dial offers good readability in tight spaces; larger dials are easier to read at a distance.
- Connection type: Most gauges use 1/4″ NPT lower mounts; confirm compatibility with your piping or manifold.
- Media compatibility: Ensure the gauge materials are suitable for non-corrosive media in your system (air, water, certain gases).
- Diaphragm type: Diaphragm capsules provide stability for low-pressure readings and reduce over-range errors in LP applications.
- Durability: Look for chrome steel or stainless steel casings, removable lenses, and robust diaphragms for longer service life in demanding environments.
- Calibration and adjustability: Gauges with adjustable zero screws help maintain accuracy over time and after installation shifts.
- Maintenance: Consider gauges with easy lens removal and accessible internals for cleaning and calibration.