Explore our certified range of stainless steel pressure gauges, explosion-proof contact switches, and precision micro-fused transmitters engineered for heavy-duty operational demands.
An in-depth metallurgical and mechanical analysis for instrumentation engineers, procurement executives, and system integrators.
Industrial stainless steel pressure gauges are manufactured using AISI 304 or AISI 316L (UNS S31603) housings, movement systems, and Bourdon tubes. Grade 316L contains 2-3% molybdenum, offering enhanced resistance to pitting and crevice corrosion in chloride-rich environments, seawater handling, and aggressive chemical processing lines compared to standard 304 SS.
Severe mechanical vibrations and hydraulic line pulsations can cause rapid wear on internal gear mechanisms, resulting in pointer flutter and premature gauge failure. All SS shock-proof pressure gauges utilize liquid filling (99.5% vegetable glycerin or silicone oil) alongside internal restrictor screws to damp movement, stabilize the pointer, and lubricate internal contact points for extended operational longevity.
High-tier stainless steel gauges feature TIG-welded case-to-socket connections and micro-molded EPDM or Viton seals. Designed to withstand ambient temperatures ranging from -40°C to +80°C, these instruments incorporate compensating rubber blow-out discs to relieve internal pressure build-up caused by thermal expansion without compromising ingress protection (IP65/IP67).
Procuring low-cost brass or mild steel gauges for aggressive process conditions leads to premature degradation, fluid contamination, unplanned downtime, and frequent replacements. Transitioning to all-stainless steel (All SS) pressure gauges significantly reduces the Total Cost of Ownership. With high fatigue limits, resistance to hydrogen embrittlement, and stable full-scale accuracy over millions of pressure cycles, All SS instrumentation serves as the gold standard for asset protection in critical infrastructure.
| Performance Criterion | All Stainless Steel Gauges (316L Bourdon/Socket) | Standard Brass / Black Steel Gauges |
|---|---|---|
| Wetted Parts Material | AISI 316L Stainless Steel / Monel Options | Copper Alloy / Brass / Carbon Steel |
| Media Compatibility | Corrosive gases, liquids, sour gas (NACE MR0175), pure fluids | Non-corrosive liquids, inert gases, dry air |
| Accuracy Class (EN 837-1) | Class 1.0 (±1.0% FS), Class 0.5 (±0.5% FS) available | Class 1.6 (±1.6% FS) to Class 2.5 (±2.5% FS) |
| Ingress Protection | IP65, IP66, IP67 Weatherproof Rating | IP32 to IP54 Basic Dust Protection |
| Overpressure Safety Limit | Up to 130% - 150% of Full Scale Value | 115% of Full Scale Value |
| Vibration & Shock Resistance | Glycerin / Silicone Filled Case, Solid Front Baffle Option | Dry Case, prone to pointer oscillation and wear |
Customized pressure monitoring architectures designed for critical sectors across global markets.
Engineered for exposure to salt spray, extreme vibration, and hydrogen sulfide ($H_2S$), our 316SS gauges meet NACE MR0175/ISO 15156 standards. Integrated with safety glass lenses and blow-out backs, they ensure continuous line monitoring on wellheads, blow-out preventers (BOP), and offshore platforms.
For applications demanding sterile conditions, our sanitary diaphragm seal gauges feature electropolished surfaces ($Ra < 0.4 \mu m$), Tri-Clamp connections, and FDA-approved transmission fluids (Neobee M-20 or USP grade glycerin), enabling CIP/SIP (Clean-in-Place / Steam-in-Place) compatibility.
High-pressure hydraulic power units (HPUs) generate intense pressure surges. Our vibration-resistant shatter-proof gauges, outfitted with internal micro-dampeners and oil filling, maintain structural integrity and steady readings under rapid cycling up to 1,000 bar (15,000 PSI).
Handling liquified natural gas (LNG), liquid nitrogen, and compressed green hydrogen requires specialized low-temperature alloys and degreased components. Our specialized clean-for-oxygen pressure instruments prevent hydrocarbon reaction risks while maintaining measurement accuracy down to -196°C.
Established over two decades ago, Huzhou Accuracy Instrument Co., Ltd. operates a state-of-the-art 3,000 square meter manufacturing facility. We are professionally engaged in the research, development, engineering, and global export of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometers, and digital pressure sensors.
Equipped with modern automated assembly lines, laser welding technology, helium leak detection stations, and automated calibration benches, our annual production capacity exceeds 2,000,000 units. We supply high-tier instrumentation solutions to over 30 countries worldwide.
Dedicated to metallurgical innovation, smart IIoT sensor integration, digital display algorithms, and ensuring compliance with stringent international standards including ISO 5171, EN 837-1, and ASME B40.100.
Leveraging high-precision CNC machining centers, automated laser calibration systems, and computerized leak-checking machinery to maintain strict product uniformity and robust structural integrity.
Providing 24/7 technical consulting, OEM/ODM customized drawing support, and localized supply chain assistance for global EPC contractors and industrial distributors.
Operating under ISO 9001 quality management benchmarks to deliver reliable, high-precision measurement tools with full traceability.
Bridging traditional mechanical pressure measurement with digital IIoT telemetry and micro-fused sensing technologies.
Moving beyond standard mechanical Bourdon tubes, our advanced technology utilizes glass micro-fused silicon pressure sensors fused at high temperatures onto stainless steel diaphragms. This solid-state design eliminates organic adhesive degradation, ensuring exceptional zero-point stability and ultra-fast frequency response for dynamic hydraulic loops.
Integrating ATEX and CE-certified magnetic snap-action contacts or inductive proximity switches into all-stainless housing allows these gauges to trigger alarms, actuate pumps, or shut off valves during pressure overruns. Designed for hazardous areas, they feature flameproof enclosures to prevent spark ignition.
Incorporating low-power wireless modules (NB-IoT, LoRaWAN, WirelessHART) into standard 316SS gauge housings empowers plants to convert isolated pressure indicators into connected node networks. Remote monitoring provides predictive maintenance alerts prior to mechanical failure, lowering operational risks.
Direct answers from our engineering team regarding selection, installation, and maintenance of stainless steel pressure instrumentation.
All Stainless Steel (All SS) pressure gauges feature both housing and wetted parts (Bourdon tube, socket, movement) constructed from high-grade stainless steel (AISI 304 or 316L). Unlike brass components, which corrode when exposed to harsh chemicals, steam, or aggressive ambient conditions, 316L SS provides chemical resistance, higher pressure thresholds, thermal endurance, and compliance with sanitary and hazardous industrial standards.
Liquid filling is recommended for applications involving severe mechanical vibration or pulsating hydraulic pressure. Glycerin (99.5%) is the standard dampening liquid for ambient temperatures between -20°C and +60°C. For extreme temperature environments (-40°C to +100°C) or applications involving electrical contact switches, Silicone oil is specified due to its consistent viscosity across wide thermal bands and non-conductive properties.
A diaphragm seal isolates the measuring element of the pressure gauge from process media that may be viscous, crystallizing, highly corrosive, or extremely hot. The flexible metal diaphragm (316L, Hastelloy C-276, Tantalum, or PTFE lined) responds to pressure, transmitting force through a hydraulic fluid fill to the Bourdon tube without allowing process fluid into the internal movement.
Our mechanical stainless steel gauges are manufactured to Accuracy Class 1.0 (permitting a maximum error of ±1.0% of full-scale value) or Class 1.6. Precision test gauges and digital pressure transmitters achieve accuracy limits of Class 0.5, 0.25, or 0.1% FS. Every gauge undergoes automated 100% calibration testing traceable to ISO/IEC 17025 accredited standards.
Browse additional models including smart transmitters, bimetallic thermometers, thin-film transducers, and explosion-proof diaphragm gauges.
Accuracy Instrument
