Low Pressure Capsule Gauges

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Brief Description

Our Low Pressure Capsule Gauges are precision instruments specifically designed to accurately measure very low positive, negative (vacuum), or differential pressures, typically measured in millimeters of water column (in.H2O or mbar).

In-depth Overview

These gauges utilize a highly sensitive capsule element, which consists of two thin, corrugated diaphragms welded together at the rim. When pressure is applied, the capsule expands or contracts, and this small movement is mechanically amplified to drive the pointer. Because of their high sensitivity, they are ideal for applications where even slight pressure variations are critical, such as monitoring draft or filtration losses in HVAC and medical equipment. The large dial size ensures maximum resolution at these low measurement scales.

Specification

Parameter	Details
Measuring Element	Copper Alloy or Stainless Steel Capsule
Pressure Range	0 to 6 mbar up to 0 to 600 mbar (or equivalent)
Accuracy Class	Class 1.6 (Standard)
Nominal Size	100mm, 150mm
Process Connection	G 1/2 or G 1/4 (BSPP) or NPT thread
Case Material	Black Steel or Stainless Steel
Media Temperature	Max. +100°C
Dial Units	Pa, mbar, in.H2O, mmHg

Applications

Medical and Laboratory Equipment: Monitoring slight pressure changes in air or gas lines for regulatory compliance.
Cleanroom/HVAC Monitoring: Measuring room-to-room pressure differentials to maintain sterility and containment.
Gas Burner and Flue Draft Measurement: Essential for optimizing combustion efficiency and safety.
Filtration Systems: Indicating pressure loss across air or gas filters to determine when maintenance is required.

Key Advantages

Extreme Sensitivity: Designed to accurately register the smallest pressure changes (down to a few Pascals).
High Resolution: Large, widely spaced markings on the dial improve readability for minute measurements.
Versatile Application: Suitable for positive, negative (vacuum), and compound low-pressure applications.
Robust Construction: Despite their sensitivity, they are built with durable mechanisms for long service life.

Payment and Shipping

We offer secured payment options including bank wire transfers (T/T). For specialized ranges and materials, production time is typically 3-4 weeks. We offer express shipping services (e.g., DHL Express) for quick delivery of these specialized gauges globally, and ensure the delicate capsule element is protected by secure internal packaging against transit shocks.

Frequently Asked Questions

Q: Is a capsule gauge the same as a differential pressure gauge?
A: No, though they are often confused. A capsule gauge measures pressure relative to the atmosphere (or a closed vacuum), while a differential pressure gauge measures the difference between two separate input pressures. Some capsule gauges are designed to measure very low differential pressure, blurring the lines in specific low-range applications.

Q: What are the main limitations of capsule gauges?
A: They are very sensitive, meaning they can be easily damaged by overpressure (even slight accidental surges). They are also generally limited to non-corrosive, non-crystallizing gases or dry air due to the delicate internal capsule mechanism.

Q: Can they be filled with liquid for vibration dampening?
A: Typically no. Liquid filling (like Glycerin or Silicone) is usually avoided in capsule gauges because the added weight and capillary effect of the fluid on the highly sensitive capsule mechanism would significantly dampen the movement and reduce accuracy.

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Low Pressure Capsule Gauges Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.