Explore our core engineering lineup of shock-proof, explosion-proof, and micro-fused sensor instrumentation tailored for demanding OEM process applications worldwide.
In modern process automation, thermal monitoring systems are routinely subjected to aggressive mechanical vibration, intense electromagnetic interference (EMI), and hazardous explosive atmospheres where direct-mounted bimetallic dials or delicate digital sensors fail prematurely. A dial capillary thermometer—also known as a remote-reading capillary thermometer—solves these critical operational bottlenecks by physically decoupling the temperature-sensing bulb from the visual indication dial via an armored capillary line spanning up to 50 meters.
Utilizing incompressible organic fluids or silicon oils across a temperature spectrum of -40°C to +400°C. As the bulb experiences thermal shifts, fluid volume expands proportionally through micro-bore tubing to actuate a internal Bourdon tube element, yielding Class 1.0 accuracy according to DIN EN 13190 standards.
Designed for extreme high-temperature ranges up to +700°C, gas-actuated systems use high-purity inert gases (such as Nitrogen, N₂). Because gas pressure directly tracks thermal changes under constant volume, these models deliver sub-second transient response speeds across heavy industrial machinery.
To resist physical crushing, chemical corrosion, and ambient mechanical fatigue, OEM capillaries are encased in flexible stainless steel interlock armor (AISI 304/316), heavy-duty PVC jacketing, or spiral-braided steel sleeves suitable for subsea, mining, and food-grade washdown environments.
Huzhou Accuracy Instrument Co., Ltd. is professionally engaged in the development, manufacturing, sales, and technical service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometers, and advanced pressure sensors. Spanning a state-of-the-art 3,000 square meter manufacturing plant, we integrate precision mechanical engineering with stringent quality management models to supply global Fortune 500 OEMs and industrial distributors.
R&D Department (20 Specialists): Focuses on material innovation, micro-bore capillary fluid dynamics, smart sensor integration, and compliance with international standards (e.g., ISO, API, ASME).
Production Workforce (120 Technicians): Operates automated laser welding, computerized dial calibration, and high-vacuum oil filling systems to guarantee repeatability and long-term zero-drift operation.
Sales & Service Unit (15 Professionals): Delivers around-the-clock technical consultation, dynamic thermal response modeling, and turn-key custom OEM designs for global clients.
Our metrology and quality assurance testing lab executes 100% pressure/temperature cycling tests, vibration stress testing, and environmental chamber simulations. Adhering strictly to ISO 9001:2008 and ISO 17025 testing frameworks, our "zero-leak" production standard ensures unyielding operation backed by comprehensive 1-year warranties.
Custom OEM capillary thermometers serve as critical safety and operational monitoring components across diverse global heavy industries. By placing the display dial in clear operator line-of-sight while isolating the sensor stem in hazardous or high-temp media, our instrumentation ensures high uptime and operator safety.
In large centrifugal chillers and heat exchangers, localized line vibration can destroy direct-mount bimetallic movement shafts. OEM capillary thermometers allow flush panel-mounting on central control cabinets up to 10 meters away, filled with dampening silicone fluid to neutralize ambient vibration.
Exposed to corrosive H₂S, acid vapors, and intense heat, pipeline fluids require heavy-duty 316L stainless steel thermowells paired with armored capillary tubing. Our explosion-proof electric contact models provide automated high-limit alarm triggering for emergency process shutoffs.
Sanitary applications demand non-toxic thermal filling fluids (such as FDA-approved vegetable glycerine or mineral oil) paired with tri-clamp sanitary connection stems. Clean-in-place (CIP) and Sterilize-in-place (SIP) compatibility guarantees pristine hygienic compliance.
High-voltage oil-immersed power transformers rely on capillary switch thermometers to monitor top-oil and winding temperatures. Integrated SPDT or DPDT electric contact switches automatically activate cooling fan banks or trip circuit breakers under critical thermal spikes.
While digital RTDs (Pt100/Pt1000) and thermocouples have gained market share, mechanical capillary thermometers remain the dominant choice across critical industrial infrastructure due to zero power dependency, total immunity to electromagnetic interference (EMI/RFI), and lower Total Cost of Ownership (TCO).
Mechanical dial capillary systems function flawlessly during total electrical blackouts or power grid failure. In remote gas pumping stations or marine engine rooms, uninterrupted continuous thermal monitoring is essential for preventing catastrophic thermal runaway events.
Digital loops require shielded wiring, signal transmitters, PLC input cards, and routine recalibration. In contrast, heavy-duty capillary dials installed with appropriate thermowells operate maintenance-free for decades, reducing capital expenditure (CAPEX) by 40-60% per measurement node.
Solid-state electronics frequently suffer drift or semiconductor failure when operated in ambient temperatures exceeding +85°C or in extreme moisture/vibration zones. Mechanical capillary movements housed in IP65/IP67 hermetically sealed cases thrive under these harsh conditions.
As a leading OEM factory, Huzhou Accuracy Instrument Co., Ltd. builds tailored dial capillary thermometers meeting exact customer engineering blueprints and international metrological codes.
Environmental conditions vary globally—from Arctic sub-zero logistics to tropical offshore maritime rigs. Huzhou Accuracy Instrument engineers tailored dial capillary thermometers that meet local geographic and industrial challenges.
Designed to resist violent engine diesel vibration and salt-spray oxidation, these units feature SS316 braided capillaries, glycerine case filling, and high-temperature synthetic oil expansion fluids capable of operating continuously up to +600°C.
Refrigerated transport trailers require external dial monitoring while interior cargo temps remain at -40°C. Our low-temperature organic fluid capillaries guarantee non-freezing action with zero dial lag under extreme arctic conditions.
Utilizing explosion-proof electric contacts certified to CE and ATEX directives, our capillary thermometers provide local dial indication while transmitting contact closure alarms to flameproof junction boxes.
Huzhou Accuracy Instrument Co., Ltd. is continuously expanding the boundaries of traditional mechanical instrumentation by fusing analog capillary durability with smart digital telemetry.
Integrating non-contact optical encoders inside the dial housing to convert mechanical pointer movement into 4-20mA HART or Modbus RS485 digital output. This provides local physical dial display and remote SCADA integration from a single process point.
Developing bio-degradable, highly thermally responsive non-toxic expansion fluids to replace traditional mercury and halogenated organic liquids, fulfilling EU RoHS and REACH environmental guidelines.
Implementing internal fluoropolymer nanocoatings within micro-bore capillary tubes to minimize internal wall friction, boosting dynamic response speed by 35% in rapid-cycle industrial heating processes.
Discover our OEM sensor transmitters, bimetallic contact switches, and specialty auto CNG pressure instruments certified for heavy-duty operational demands.
We long follow the business philosophy of "reasonable price, accurate delivery, reliable quality" under ISO9001:2008 standards. Our certified production facilities guarantee exceptional manufacturing precision across every product batch.
Accuracy Instrument
