Industrial thermal monitoring demands unwavering precision, mechanical durability, and instant visual readout. The OEM Thermometer Bimetal Bottom Connector (Celsius Scale) represents the gold standard in non-electric, mechanical temperature monitoring across demanding processing environments. Utilizing the differential coefficient of thermal expansion ($\Delta\alpha$) between two bonded metallic strips—typically high-expansion manganese-nickel-copper alloys paired with low-expansion Invar (Ni36)—these instruments transform thermodynamic energy directly into precise angular displacement.
In modern industrial bimetal thermometry, the geometry of the sensing element directly dictates response time ($\tau_{90}$), hysteresis resistance, and longevity. Our factory utilizes computer-controlled, stress-relieved helical bimetallic coils inside the lower stem to eliminate frictional contact with inner stem walls.
Designed for long stem lengths (100mm to 1000mm) and high-vibration applications. The helical twist maintains uniform axial torsional force without touching the protective SS316 sheath, minimizing mechanical hysteresis to $\le 0.5\%$ full scale.
Ideal for shallow insertion depths ($< 63\text{mm}$) and low-profile housings. Provides compact torque output calibrated specifically for direct-drive pointer assemblies in compact Celsius-scale process dials.
| Parameter | Standard Industrial Specification | Severe Service / High-Precision Option |
|---|---|---|
| Dial Diameters | 63mm (2.5"), 100mm (4"), 150mm (6") | Custom OEM Dial Sizes (50mm - 200mm) |
| Temperature Range (°C) | -50°C to +500°C (Single Celsius Scale) | -80°C to +600°C (Dual Scale °C/°F available) |
| Accuracy Class | Class 1.6 (EN 13190 / ASME B40.200 Grade A) | Class 1.0 (Grade AA / $\pm 1.0\%$ Full Scale) |
| Process Connection | 1/4", 3/8", 1/2" NPT / G / BSP Male Bottom Mount | Sliding Union, Tri-Clamp Sanitary, Flanged |
| Wetted Parts Material | Stainless Steel AISI 304 | AISI 316L, Hastelloy C-276, PTFE Coated |
| Ingress Protection | IP65 Hermetically Sealed | IP67 / Dampening Fluid Filled (Silicone Oil) |
| External Zero Adjustment | Slotted Screw on Back or Internal Reset | External External Hex Reset Screw on Dial Bezel |
Huzhou Accuracy Instrument Co., Ltd. is professionally engaged in the development, sales, and service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometers, and pressure sensors. Products are widely used in various applications such as Mechanical Engineering, Chemical Engineering, Food Industry, Pharmaceutical, and high technology electric appliances.
Established over two decades ago, our pressure gauge and temperature instrument manufacturing facility spans 3,000 square meters, equipped with advanced production lines and rigorous quality control systems. As an industry leader, we integrate innovation with precision engineering to deliver reliable measurement solutions for global clients.
Annual output exceeds 2 million units, covering industrial-grade gauges (e.g., stainless steel gauge, black steel gauge, shock-proof gauge, SF6 gauge, thermometer, pressure sensor) for oil/gas, HVAC, and pharmaceutical sectors.
Products exported worldwide, with certifications including ISO, SGS, and CE, earning global recognition for extreme corrosion resistance and $\pm 0.5\%$ precision options.
Our laboratory conducts 100% pressure cycle tests, thermal bath calibration, and environmental simulations, adhering strictly to ISO 9001 and ISO 17025 standards.
Continuous improvement drives our reputation for "zero-leak" performance in extreme industrial conditions, backed by a comprehensive one-year factory warranty.
We have long followed the concept of "reasonable price, accurate delivery, good quality" and several business management models to keep our production quality above the required benchmark under ISO9001:2008 certified.
The versatility of the Bottom Connector Bimetal Thermometer (Celsius) makes it indispensable in diverse harsh environments globally. Customization options ensure optimal fluid resistance, thermal transfer rate, and physical protection.
In oil refineries across the Middle East and Gulf Coast, bottom mount thermometers are screwed directly into thermowells installed on horizontal process lines. The downward stem orientation allows maintenance teams to view thermal readings at eye level while protecting the internal bimetal coil from high fluid pressures ($> 100\text{ bar}$).
In district heating plants across Northern Europe and East Asia, accurate Celsius monitoring of supply and return water is critical for energy efficiency. Our 100mm dial bottom-connector models feature high-contrast dual-color dials (0°C to 120°C) with red limit pointers for swift visual verification.
Strict hygiene compliance demands non-contaminating, CIP (Clean-In-Place) compatible hardware. We supply stainless steel 316L stems with sanitary Tri-Clamp bottom connections and hermetically sealed IP67 cases, preventing liquid ingress during washdowns.
As Industry 4.0 transforms process automation, physical mechanical instruments are evolving rather than disappearing. Mechanical bimetal thermometers remain the primary fail-safe layer, operating zero-power local monitoring alongside digital telemetry networks.
Our R&D division is standardizing optical dial-reading sensor rings and micro-RTD (Pt100) inserts within the bimetal thermowell. This hybrid architecture grants operators simultaneous mechanical analog redundancy and 4-20mA / Modbus RS485 digital output to DCS systems.
To survive severe chemical exposure (e.g., continuous $\text{H}_2\text{S}$ gas or concentrated sulfuric acid), our next-gen stems integrate Hastelloy C-276 cladding, titanium sleeving, and fluoropolymer (PTFE) heat-shrinkable coatings, extending product operational life under high corrosive strain by up to 300%.
Huzhou Accuracy Instrument Co., Ltd. is strategically situated within Eastern China's precision manufacturing corridor. This industrial cluster grants immediate, frictionless access to certified raw stainless steel stock, high-precision CNC turning, micro-welding gas supplies, and international shipping ports in Shanghai and Ningbo.
From raw tube drawing and bimetal coil twisting to automatic dial printing, helium leak testing, and laser welding—over 85% of processes occur in-house within our 3,000 m² factory.
Flexible CNC tooling enables custom process thread cutting (e.g., metric, NPT, standard BSP, UNF) and custom logo dial printing within rapid turnaround cycles for global distributor partners.
Every batch undergoes 100% multi-point temperature bath calibration ($0^\circ\text{C}$ ice bath and $100^\circ\text{C}$ dry-block standard) traceable to national metrology standards before final packaging.
Accuracy Instrument
