Diaphragm Seal Pressure Gauges

-- Steady & Reliable Manufacturer --

Brief Description

Diaphragm Seal Pressure Gauges are essential when measuring pressure in processes involving highly corrosive, viscous, crystallizing, or hot media. The seal acts as a barrier, protecting the gauge's sensitive measuring element from direct contact with the process fluid.

In-depth Overview

These assemblies consist of a standard pressure gauge connected to a diaphragm seal via a capillary tube, which is filled with a specific system fill fluid. The corrugated diaphragm transmits the process pressure reliably to the gauge. We offer seals in various materials like Tantalum, Monel, or PTFE-lined stainless steel to ensure maximum chemical resistance across different applications, making them a crucial solution for isolation and safe monitoring.

Specification

Parameter	Details
Gauge Size (Nominal)	100mm, 150mm
Pressure Range	Vacuum to 100 MPa (15,000 psi)
Diaphragm Material	SS 316L, Hastelloy, Monel, Tantalum
Process Connection	Threaded, Flange (ANSI/DIN), Sanitary Clamp
Fill Fluid	Silicone Oil, Glycerin, FDA-approved Oils
Accuracy Class	Typically Class 1.0
Operating Temperature	Up to 400°C (depending on fill fluid)
Mounting Type	Direct or Remote (Capillary)

Applications

Polymer and Viscous Fluid Processing: Prevents highly viscous materials (like asphalt or heavy oils) from clogging the instrument port.
Highly Corrosive Media: In chemical plants dealing with strong acids or bases.
Sanitary/Aseptic Applications: Flush-mounted seals for easy cleaning in food, dairy, and biotech industries.
High-Temperature Processes: Use of remote capillary systems to protect the gauge from radiant or conducted heat.

Key Advantages

Instrument Protection: Completely isolates the pressure element from harmful, dirty, or hot process fluids.
Customizable Wetted Parts: Wide selection of materials ensures compatibility with virtually any aggressive medium.
Non-Clogging Design: Flush diaphragm prevents material buildup, ensuring long-term accuracy and reliability.
Ease of Maintenance: Simplifies cleaning and extends the life of the primary pressure instrument.

Payment and Shipping

We accept payments via T/T (Telegraphic Transfer) and verified Letter of Credit (L/C) for large orders. Due to the custom assembly required for these specialized gauges, lead times are confirmed at the time of order placement. We use robust wooden crates and protective packaging for all flanged and capillary assemblies to safeguard the integrity of the fill fluid and the delicate seal during international transport.

Frequently Asked Questions

Q: Does the diaphragm seal affect the accuracy of the gauge?
A: Yes, slightly. The added components and fill fluid introduce a small potential error, typically within 1-2% of the full scale. However, this minor reduction in accuracy is a trade-off for protecting the gauge and ensuring functionality in severe conditions.

Q: How do I choose the correct fill fluid?
A: The fill fluid must remain stable (not solidify or vaporize) across the entire operating temperature range and must be chemically compatible with the process medium (in case of diaphragm failure). We provide technical assistance to select the optimal fluid.

Q: Can I use a diaphragm seal on a pressure transmitter instead of a gauge?
A: Absolutely. Diaphragm seals are commonly used with pressure transmitters and switches for the same protection and isolation benefits, especially in critical control loops.

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Diaphragm Seal Pressure 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.