In modern industrial thermal power engineering, hydronic heating systems, and heavy-duty steam plant operations, real-time control of system thermodynamics is a baseline safety requirement. A Boiler Pressure And Temperature Gauge (commonly engineered as a Tridicator or combination thermomanometer) provides dual diagnostic capability within a single physical tapping point on pressurized vessels. By combining a C-type or helical Bourdon tube for hydrostatic pressure measurement alongside a coiled bimetallic strip or remote capillary bulb for thermal sensing, these instruments reduce structural wall penetrations, minimize potential fluid leakage paths, and deliver immediate visual readings for plant maintenance technicians.
Sourcing from an established China boiler pressure and temperature gauge supplier and factory grants global engineering procurement managers access to precision-machined, highly repeatable measuring devices manufactured under stringent EN 837-1 and ASME B40.100 quality guidelines. Today’s industrial boilers—ranging from low-pressure HVAC hot water boilers to high-pressure superheated steam generators—require specialized metallurgy (such as AISI 316L stainless steel, Monel, or heavy-duty brass alloys) capable of handling severe thermal shock, hydraulic hammer, and aggressive chemical dosing in feed-water streams.
Huzhou Accuracy Instrument CO LTD is professionally engaged in the development, sales, and technical service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 density manometers, and advanced pressure sensors. Our product lines are extensively deployed across critical global infrastructure including Mechanical Engineering, Chemical Processing, Food & Beverage Processing, Pharmaceutical Manufacturing, and High-Technology Electrical Appliances.
Established over two decades ago, our specialized pressure gauge manufacturing complex spans 3,000 square meters, fully equipped with automated assembly channels, modern cleanrooms, and high-precision laser calibration systems. As an authority in pressure and thermal sensing, we combine structural design innovation with continuous quality assurance to deliver robust measurement instruments to international clients.
R&D Department (20 specialists): Focuses on material innovation, smart sensor integration (4-20mA/HART/Modbus), and strict compliance with ISO and API standards.
Production Workforce (120 technicians): Utilizes micro-welding, automated dial print-setting, and robotic liquid filling for vibration resistance.
Sales & Service Unit (15 professionals): Provides 24/7 technical application support and engineered OEM solutions across 30+ countries.
Our annualized factory production exceeds 2 million units, encompassing all grades of industrial pressure gauges (stainless steel casing, black steel utility, shock-proof glycerine-filled, SF6 density monitors, bimetal thermometers, and silicon transmitters).
Extensive export networks span Europe, North America, Southeast Asia, and the Middle East, certified with ISO9001, SGS, and CE to guarantee superior corrosion resistance and up to ±0.5% full-scale precision.
Our in-house testing laboratory conducts 100% full-cycle pressure impulse testing, thermal chamber aging, and helium leak detection in strict compliance with ISO 9001 and ISO 17025 protocols.
Continuous technological iteration reinforces our industry reputation for "Zero-Leakage" under severe thermal fluctuations and mechanical vibration, backed by a comprehensive 12-month factory warranty.
Traditional mechanical dial indicators are increasingly augmented with electronic micro-fused silicon pressure transmitters and RS485 Modbus/HART communication modules. This dual mechanical-digital setup allows plant operators to maintain visual local readings during power outages while streaming high-frequency pressure/temperature data to SCADA systems for predictive maintenance analytics.
As commercial boiler systems shift toward low-carbon hydrogen-natural gas fuels, thermal temperatures and media embrittlement risks increase. Modern gauge factories utilize specialized NACE MR0175 compliant AISI 316L and Hastelloy C-276 Bourdon tubes paired with gold-plated diaphragms to prevent hydrogen permeation and chemical corrosion.
Architectural and OEM boiler footprints are shrinking. System designers favor single-tap combination pressure and temperature compound gauges over dual-instrument setups. This reduces procurement inventory complexity, cuts installation labor costs by 50%, and minimizes potential thread leak points under cyclic heat loads.
Our production facilities utilize automated laser-welding lines for joining Bourdon tubes to process connections. Computer-vision calibration systems dynamically print custom dials matched precisely to the linear response curve of each individual bimetallic thermal element. This eliminates mechanical hysteresis and ensures Class 1.0 / Class 1.6 accuracy ratings (EN 837-1) across the entire scale range.
By controlling raw material casting, CNC machining of stems/wells, hairspring winding, and liquid filling (glycerine, silicone oil, or fluorolube) within a single 3,000 m² ecosystem, Huzhou Accuracy Instrument drastically reduces production lead times. OEM customers benefit from tailormade dial logos, custom pressure scales (PSI, Bar, kPa, MPa), flexible capillary lengths, and specific thread standards (NPT, BSPP, BSPT, Metric).
| Parameter / Specification | Standard Boiler Tridicator / Pressure Gauge | Explosion-Proof / Electric Contact Gauge | High-Precision Digital Sensor Transmitter |
|---|---|---|---|
| Dial Sizes | 2.0" (50mm), 2.5" (63mm), 3.0" (80mm), 4.0" (100mm) | 4.0" (100mm), 6.0" (150mm) | Compact Housing / LED Digital Display |
| Pressure Ranges | 0 to 15 PSI up to 0 to 600 PSI (0-40 Bar) | 0 to 0.6 MPa up to 0 to 100 MPa | -0.1 to 0 MPa up to 0-60 MPa (Micro-fused) |
| Temperature Ranges | 30°F to 250°F / 0°C to 120°C (Dual Scale) | -40°C to 500°C (Bimetallic stem) | -40°C to 150°C (RTD / Thermocouple integrated) |
| Accuracy Class | ±1.6% or ±2.5% Full Scale | ±1.0% or ±1.6% Full Scale | ±0.25% or ±0.5% Full Scale |
| Wetted Materials | Lead-Free Brass, Copper Alloy, AISI 304 SS | AISI 316 Stainless Steel / Monel / Diaphragm Seal | 316L SS / Ceramic / Micro-fused Silicon |
| Process Connection | 1/4" NPT, 1/2" NPT, 1/4" BSP, Center Back / Bottom | 1/2" NPT Radial Bottom / Back Flange | G1/4", G1/2", 1/4" NPT Male, Tri-Clamp Hygienic |
| Ingress Protection | IP54 / IP65 (Liquid Filled) | IP65 / Ex d IIC T6 Gb (Explosion Proof) | IP67 / IP68 Submersible Design |
Installed directly on steam headers and hot-water supply manifolds. Combination tridicator gauges monitor line pressure and outlet temperature simultaneously, giving boiler technicians immediate verification of thermal efficiency, draft conditions, and expansion tank operation without needing multiple installation taps.
Explosion-proof electric contact bimetal thermometers and SS 316 heavy-duty pressure gauges provide high-integrity switching controls in hazardous zone environments (Ex d IIC T6). They trigger automatic shut-off valves or high-alarm annunciators when pressure or temperature breaches critical thresholds.
Specialized gas density monitors detect micro-leaks of Sulfur Hexafluoride (SF6) gas in high-voltage circuit breakers. Gas density is tracked precise to thermal variations via temperature-compensated mechanical assemblies, guarding power grid safety.
Equipped with sanitary Tri-Clamp diaphragm seals and FDA-compliant mineral oil or glycerine fill, these units isolate measuring mechanisms from process media, enabling Clean-in-Place (CIP) and Sterilize-in-Place (SIP) routines.
Accuracy Instrument