Diaphragm Pressure Gauge for Corrosive Media

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Product Overview

Our Diaphragm Pressure Gauges use a flexible metallic or PTFE-coated diaphragm as the pressure sensing element, physically isolating the internal Bourdon tube mechanism from the process media. This design is indispensable when measuring corrosive liquids, gases, pastes, or viscous fluids that would rapidly destroy a standard gauge. With diaphragm materials ranging from 316L stainless steel and Hastelloy C-276 to tantalum and PTFE-lined options, our gauges deliver reliable, long-term measurement even in the most chemically aggressive applications found in the chemical processing, pharmaceutical, and waste treatment industries.

Technical Specification Sheet

Parameter	Detail
Pressure Range	0–100 mbar up to 0–400 bar
Accuracy Class	±1.6% or ±2.5% of full scale
Nominal Size	DN 100 mm (4"), 150 mm (6")
Diaphragm Material	SS 316L, Hastelloy C-276, Monel, Tantalum, PTFE-lined
Case Material	Stainless Steel 304 (standard), Black Steel
Fill Medium	Glycerin or Silicone Oil (inert, food-grade available)
Process Connection	G1/2, NPT1/2, flange mount (DIN/ANSI, optional)
Operating Temperature	−40°C to +200°C (media contact)

Key Features

Diaphragm completely isolates the sensitive Bourdon tube from aggressive process media.
Wide selection of exotic alloy diaphragm materials to match any chemical compatibility requirement.
Integral or remote diaphragm configurations available for high-temperature or restricted-space applications.

Typical Use Cases

Chemical Processing: Measuring pressure of strong acids (HCl, H₂SO₄) or alkalis (NaOH) that dissolve copper-alloy wetted parts.
Pulp & Paper Industry: Handling caustic cooking liquors and chlorine-based bleaching agents.
Wastewater Treatment: Monitoring sludge and slurry pressures where clogging of standard ports is a concern.
Pharmaceutical: Sterile process isolation with PTFE-lined diaphragm and sanitary connections.
Food & Beverage: Hygienic pressure measurement of acidic juices, vinegar, and fermentation vessels.

Competitive Benefits

Chemical Compatibility Matrix: Our engineering team provides a full chemical resistance guide to help select the optimal diaphragm material for your specific process.
No Media Blockage: The open diaphragm face prevents the pinholes and ports of standard gauges from clogging with viscous or crystallizing media.
Leak-Free Welded Construction: Diaphragm is laser or TIG welded to the process connection — no mechanical seals that can fail over time.
Low Pressure Sensitivity: Thin diaphragms accurately detect pressures as low as 100 mbar, broadening the application range.
Custom Fill Fluids: Inert, food-grade, or high-temperature fill fluids available to match specific media and temperature conditions.

Payment and Shipping Details

We accept T/T (30% deposit, balance before shipment) and irrevocable L/C at sight. Shipping terms are commonly FOB Shanghai or CIF destination port. Standard SS 316L diaphragm models ship in 10–15 working days; exotic alloy (Hastelloy, Tantalum) versions require 20–30 working days due to raw material sourcing. Material Certificates (EN 10204 3.1) for diaphragm materials are provided upon request.

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Diaphragm Pressure Gauge for Corrosive Media 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.