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Product Introduction

Precision instrumentation engineered for chemical resistant diaphragm pressure gauge applications

The Chemical Resistant Diaphragm Pressure Gauge pairs a standard, reliable gauge movement with a diaphragm seal, a thin corrosion-resistant membrane that separates the process fluid from the inside of the instrument. Pressure acts on the diaphragm, which transfers it through a sealed fill liquid to the Bourdon tube; the aggressive medium never enters the movement. This lets a well-proven pressure indicator be applied to sulfuric acid, hydrochloric acid, caustic solutions, chlorinated solvents, and other harsh chemicals.

The critical decision is the wetted material. Stainless steel 316L covers many mild chemicals, while Hastelloy C-276 handles strong oxidizing and reducing acids, tantalum resists very concentrated hydrochloric and sulfuric acid, and PTFE-lined diaphragms provide broad chemical inertness at moderate pressure. Each option is selected against the customer's media, concentration, and temperature rather than guessed from a generic table.

Every seal system is filled and sealed in our 100,000-level clean workshop under vacuum, since any trapped air would compress and cause reading error or slow response. Fill fluid type, diaphragm material batch, and calibration results for the complete assembly are stored in our Advanced MES digital tracking system against a single serial number, giving plant maintenance teams a full material trail for their process safety files.

The lower housing is designed with a flushing port option so the process side can be cleaned or drained during shutdown, and a threaded connection or short flange keeps the seal close to the pipe to minimize fill volume and thermal error. For fluoropolymer and lined designs, careful torque guidance is provided because over-tightening can distort the liner and cause leakage.

Core Advantages

Engineered for reliability where it matters most

Hastelloy / Ta / PTFE

Diaphragm Material Choices

Vacuum

Sealed Fill System

Flush Port

Optional for Cleaning

Media-Specific Wetted Materials — Hastelloy, tantalum, or PTFE options matched to the acid, base, or solvent being measured
Complete Movement Isolation — Aggressive process fluid never reaches the Bourdon tube or gear train
Vacuum-Filled Seal System — Eliminates trapped air that would compress and cause response lag or error
Flush Port Option — Allows the process side to be cleaned during shutdown to prevent residue build-up
Single-Serial Material Trail — Diaphragm, fill fluid, and calibration data are traceable together for process safety files
MES Traced Production — Serial-linked quality data from raw material to shipment for full after-sale traceability

Specifications

Standard technical parameters

Dial Size	100mm (4"), 150mm (6")
Accuracy Class	Class 1.6 Full Scale (seal system included)
Pressure Range	0-1 Bar to 0-100 Bar
Diaphragm Material	316L SS, Hastelloy C-276, Tantalum, or PTFE-Lined
Fill Fluid	Silicone Oil, Glycerin, or Fluorinated Oil (per media)
Lower Housing	316L SS, Hastelloy, or PTFE-Lined Alloy
Process Connection	1/2" NPT, 1" NPT, or Short Flange
Case	304 or 316L Stainless Steel, Liquid-Filled
Flush Port	Optional 1/4" NPT
Media Temperature	-20°C to +200°C (fill dependent)

Technical Summary

Order & production details

MOQ	50 Pieces (Standard Material Combinations)
Lead Time	30-40 Days (seal fabrication and vacuum fill)
Packaging	Individual boxes with process-side protective cap and wetted material tag
Certifications	ISO9001:2015, CE, RoHS Compliant, Material Test Certificate (MTC)
Raw Materials	Hastelloy C-276, Tantalum Foil, PTFE, 316L SS
Customization	Diaphragm material, fill fluid, connection, flush port
Port of Export	Ningbo / Shanghai
Payment Terms	T/T, L/C at Sight, Western Union

Our Partners

Trusted by leading brands worldwide

Industrial Applications

Where chemical resistant diaphragm pressure gauge performance is mission-critical

Sulfuric and Hydrochloric Acid Lines

Reads pressure on acid dosing and transfer lines where standard gauges corrode in days

Chlor-Alkali and Caustic Processing

Isolates the movement from strongly alkaline brines and caustic solutions

Pharmaceutical and Fine Chemical Reactors

Provides pressure indication on solvent and reagent lines with strict cleanliness rules

Wastewater Chemical Dosing

Monitors dosing pump discharge for corrosive treatment chemicals

Electroplating and Surface Treatment Lines

Reads pressure on plating solutions containing acids and metal salts

Technical Highlights & QC

Every unit validated for zero-defect performance

Diaphragm Material Certification: Wetted diaphragm and housing materials are verified against material test certificates before assembly.
Vacuum Fill and Bubble Check: Seal systems are filled under vacuum and inspected to confirm no air remains in the capillary path.
Diaphragm Leak Test: Completed assemblies are held under pressure to confirm no leakage across diaphragm, welds, or seals.
Thermal Error Check: Assemblies are checked across the rated temperature range to quantify fill expansion error.
Linearity and Hysteresis Sweep: The whole gauge-plus-seal system is stepped through its range to verify accuracy class.
MES Serial Tracking: Diaphragm material, fill fluid, and calibration are stored digitally against a single serial number.

Environment & Media Compatibility

Engineered for demanding operating environments

Strong Mineral Acids: Hastelloy and tantalum options are chosen for concentrated hydrochloric and sulfuric acid service.
Caustic and Alkaline Solutions: Suitable housing and diaphragm alloys resist stress and attack from strong bases.
Chlorinated and Aromatic Solvents: PTFE-lined seals provide broad inertness against most organic solvents.
Elevated Process Temperature: Fill fluid and capillary length are selected to limit thermal expansion error.
Corrosive Outdoor Atmosphere: Stainless case and sealed liquid fill resist chemical plant fumes.
Intermittent Process Shutdown: Flush port supports cleaning between batches to avoid residue crystallizing.

Pro Tips for Longevity

Installation & maintenance best practices

Confirm Media and Concentration: Send us the fluid, concentration, and temperature so the correct diaphragm alloy can be selected.
Torque Lined Housings Carefully: Follow torque guidance for PTFE-lined seals; over-tightening can distort the liner.
Keep Seal Close to the Pipe: Short connections reduce fill volume and thermal error.
Do Not Loosen the Seal Assembly: Never separate the seal from the gauge in the field; the fill system is factory sealed.
Flush Before Shutdown: Use the flush port to rinse the process side before long shutdowns.
Log Wetted Material Serial: Record the gauge serial and material in your asset register for safety audits.

Payment & Logistics

Reliable global supply chain from factory to your site

Flexible Payment Terms: We support T/T (30% deposit, balance before shipment), L/C at sight for large orders, and secure B2B trade assurance platforms for new customers.
Global Freight Options: Sea freight from Ningbo or Shanghai for bulk orders; DHL, FedEx, or UPS air express for urgent sample and small-batch shipments.
Wetted-Part Protected Packaging: Each seal assembly ships with a process-side cap and a tag showing the wetted material and fill fluid.
Full Export Documentation: Commercial invoice, packing list, certificate of origin (CO), material test certificate (MTC), and CE declaration of conformity provided with every shipment.
Sample Lead Time: Standard material combination samples are available in 15-20 working days.
After-Sales Support: Our technical team provides material selection guidance and installation torque advice for your chemical process.

About Us

Zhoushan Jiaerling Meter Co., Ltd. — 20 years of precision manufacturing

Zhoushan Jiaerling Meter Co., Ltd. was established in 2004. It is China Chemical Resistant Diaphragm Pressure Gauge Manufacturers and Wholesale Chemical Resistant Diaphragm Pressure Gauge Factory, which is a high-tech enterprise integrating design, research and development, manufacturing, import and export trade.

The company is located in Zhoushan City, Zhejiang Province, covering an area of 15,000 square meters, equipped with a 100,000-level clean workshop, conventional production and assembly workshop, automated production workshop, new laboratory and comprehensive office building.

After more than 20 years of hard work and development, the company has a stable design and development, production team, and advanced production and testing equipment. The company specializes in the production of various types of pressure gauges with complete specifications, and the annual output of pressure gauges reaches 6 million. In order to further develop, the company not only seeks improvement in technology, but also pays more attention to product quality and after-sales service. The company's purpose is to "regard quality as life, survive by reputation, promote development by technology, and serve customers with high-quality brands". The products are sold all over the world and are well received by domestic and foreign customers.

In 2019, the company participated in the compilation of the standard T/CECS10012-2019 "Gas Heating Hot Water Boiler and Water Heater Water Circuit Components" of the China Engineering Construction Standardization Association.

Under the implementation of modern and digital enterprise management, the company has successfully introduced the advanced MES system in 2023, and the order process is fully visualized to track data, ensuring the continuity of production and improving production efficiency.

The company will continue to adhere to the principles of excellence, accuracy, reliability, continuous improvement, and meeting customer needs, hoping to share harmony and prosperity with friends across the country.

Honor

Certifications and proprietary achievements

High-Tech Enterprise

Proprietary

Frequently Asked Questions

Everything you need to know before specifying or ordering

Why use a diaphragm seal instead of a standard gauge?

A seal isolates the movement from aggressive, viscous, or contaminating media that would damage or block a standard Bourdon tube.

How do I choose between Hastelloy, tantalum, and PTFE?

It depends on the chemical, concentration, and temperature; send us your media data and we will recommend the best option.

Does the fill fluid affect accuracy?

Yes, fill expansion causes small errors at temperature extremes, which is why fluid type and capillary length are matched to the duty.

Can the seal be cleaned in place?

A flush port option supports cleaning; the process side can also be dismantled at the flange.

Is PTFE suitable for high pressure?

PTFE-lined designs are best at moderate pressure; consult us for pressure and vacuum limits.

Will the gauge work on vacuum service?

Yes, but vacuum ranges need careful fill selection; specify your minimum absolute pressure.

Do you supply material test certificates?

Yes, MTCs for wetted parts are available with each order.

What accuracy can I expect?

Class 1.6 including the seal system is typical; tighter classes can be discussed for specific ranges.

How long is the lead time?

Typically 30-40 days because of seal fabrication and vacuum fill.

Can I get a remote seal with capillary?

Yes, capillary-connected versions are available; see our flange and remote seal options.