Select from our CE-certified inventory of industrial manometers, diaphragm seals, and smart density switches engineered for extreme conditions.
Overcoming Thermal Drift, Mechanical Fatigue, and Fluid Decomposition in Harsh Industrial Operations
Standard C-type Bourdon tubes suffer from zero shift, span degradation, and elastic element annealing when exposed to media exceeding 100°C. Our high-temperature process pressure gauges utilize direct cooling towers, armored capillary lines, and high-viscosity thermal fluid isolation to decouple the sensing element from thermal spikes up to +400°C (+752°F).
Utilizing high-purity laser welding techniques, our diaphragm seals isolate corrosive or viscous high-temperature media. We fill internal seal cavities with specialized synthetic heat-transfer oils (e.g., High-Temp Silicone, Halocarbon, or Neobee M-20) capable of preserving dynamic response rates without vaporizing or expanding uncontrollably inside the Bourdon tube.
To resist severe chemical attack under elevated temperatures, our wet parts are available in SS316L, Hastelloy C-276, Monel 400, Inconel 600, and Tantalum coatings. All materials are certified with EN 10204 3.1 chemical and mechanical test reports to eliminate intergranular corrosion and stress cracking risks.
When selecting pressure instrumentation for refinery thermal cracking, steam header distribution, or polymer extrusion, standard brass or stainless steel gauges fail rapidly. The table below illustrates structural and operational differences:
| Parameter / Feature | Standard Industrial Pressure Gauge | CE Certified High-Temp Diaphragm Gauge |
|---|---|---|
| Max Process Media Temp | -40°C to +60°C (-40°F to 140°F) | -40°C to +400°C (-40°F to 752°F) via Thermal Dissipation |
| Thermal Zero Shift | ±0.4% per 10°C temperature change | < ±0.05% per 10°C with Compensated Fill Fluids |
| Wetted Parts Material | Brass, Bronze, standard SS304 | Laser-welded SS316L, Hastelloy C276, Tantalum, Monel |
| Overpressure Protection | 1.15x Full Scale Value (Limited) | Up to 130% - 300% Full Scale Value (Diaphragm-backed) |
| Pulsation & Vibration Resistance | Unfilled or basic Glycerin (max 90°C) | High-temp Silicone Fill + Micro-adjustable Restrictor Screw |
| Regulatory Compliance | Basic CE Mark | CE EN 837-1, ATEX Zone 1/21, PED 2014/68/EU Module A2 |
20 Years of Scientific Research, Advanced Metallurgy & Precision Calibration
Founded over two decades ago, Huzhou Accuracy Instrument Co., Ltd. operates a modern 3,000 square meter manufacturing facility engineered specifically for industrial pressure and temperature instrumentation. As an established CE-certified manufacturer, we solve the most challenging measurement problems encountered by global engineering teams.
Our facility integrates automated laser-welding workcenters, computer-controlled helium mass spectrometer leak detectors, and multi-stage pressure cycle testing rigs. Operating under strictly enforced ISO 9001:2008 and ISO 17025 laboratory frameworks, we ensure zero-leak performance across corrosive, high-vibration, and high-temperature thermal environments.
Guaranteeing Structural Integrity, Explosion Protection, and Regulatory Adherence across European and Global Markets
Our pressure gauges meet the rigorous safety criteria of the European Pressure Equipment Directive (PED). Every high-temperature process pressure gauge undergoes hydrostatic overpressure testing up to 1.5 times the maximum working pressure, ensuring shell stability and zero burst risk under unexpected pressure surges.
Designed and calibrated strictly in accordance with EN 837-1 (Bourdon tube pressure gauges), our instruments offer defined accuracy classes (Class 1.0, Class 1.6, and optional Class 0.5 calibration). Dial scales are laser-etched to prevent fading or distortion when exposed to UV or high thermal radiation.
For high-temperature applications operating in hazardous gas or dust atmospheres (e.g., petrochemical plants, gas refineries), our electric contact diaphragm gauges feature ATEX-compliant explosion-proof terminal boxes and spark-free reed/inductive contacts, preventing ignition risks in Zone 1 and Zone 21 environments.
We adhere strictly to reasonable pricing, accurate delivery schedules, and continuous quality audits to guarantee that our production benchmarks exceed global standard operating procedures.
Streamlined OEM/ODM Manufacturing, Scalable Volume Output, and Unrivaled Cost-Efficiency for Enterprise Buyers
Situated in the heart of Yangtze River Delta industrial cluster, Huzhou Accuracy Instrument controls raw material sourcing, precision machining, movement assembly, dial calibration, and testing under one roof. This minimizes supply chain bottlenecks and reduces production lead times by up to 35% compared to Western competitors.
Whether your application requires specialized flange dimensions (ANSI, DIN, JIS), customized pressure ranges (-0.1 to 160 MPa), dual dial scales, or extreme capillary extension lengths (up to 15 meters), our engineering team crafts bespoke solutions tailored to exact procurement specifications.
Every single gauge undergoes 100% full-scale thermal cycle testing and dynamic load testing prior to packaging. Backed by our standard 12-month zero-defect warranty, international procurement directors can rely on consistent performance across overseas project deployments.
Delivering Uncompromising Accuracy in Thermal Power Plants, Refineries, Chemical Synthesis & Hygiene Facilities
Monitoring high-temperature thermal cracking units, distillation columns, and asphalt processing lines where hot media exceed 300°C. Diaphragm seal isolation prevents heavy oil solidification inside pressure ports.
Measuring steam boiler drum pressures, turbine inlets, and feed-water heater loops. Cooling tower siphons protect delicate internal springs from high-temperature live steam degradation.
Handling aggressive acids, caustic vapors, and reactive polymers at elevated operating temperatures. Exotic material options like Hastelloy C276 and Tantalum resist severe pitting and crevice corrosion.
Sanitary direct-mount flush diaphragm gauges designed for high-temperature CIP (Clean-In-Place) and SIP (Sterilization-In-Place) steam cycles up to 150°C, meeting 3-A and EHEDG standards.
Pioneering Smart Sensing, Hybrid Transducers, and Green Hydrogen Pressure Isolation
The industry is transitioning toward local visual dial displays integrated with 4-20mA HART or RS485 Modbus electronic transmitters. Our hybrid sensors allow maintenance crews to verify pressures visually onsite while transmitting real-time digital telemetry to central SCADA system controllers.
As clean energy infrastructure expands globally, measuring high-pressure hydrogen gas under varying thermal cycles demands anti-embrittlement materials. We provide specialized gold-plated stainless diaphragms and helium-tested SF6 density monitors engineered to eliminate gas permeation.
Next-generation pressure gauges incorporate micro-strain sensors to detect micro-cracks or diaphragm displacement drift before failure occurs. This proactive approach reduces unplanned downtime in critical petrochemical refineries and power generating facilities.
Expert Engineering Solutions for Purchasing Managers, System Integrators & Technical Specialists
Complete Range of Bi-metal Thermometers, Pressure Sensors, and Density Monitors
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