Core Value
The Micro Needle Probe 3 Wire Pt100 Temperature Sensor is an ultra-compact Resistance Temperature Detector (RTD) engineered for applications where space is extremely limited and instant thermal response is critical. Featuring an ultra-fine 316L stainless steel needle sheath with diameters down to Ø 0.8 mm, this micro probe allows precise spot-temperature measurement in small liquid samples, micro-reactors, medical laboratory setups, and delicate electronic components without draining heat from the measurement target.
By combining a precision Class A platinum thin-film element with a 3-wire lead circuit, this sensor delivers high linearity and accuracy ($\pm 0.15^\circ\text{C}$ at $0^\circ\text{C}$) while completely eliminating errors caused by lead wire resistance over extended cable runs. The low thermal mass of the needle tip enables sub-second response times, allowing PID controllers to track micro-thermal fluctuations instantly. BACKED BY EXTENSIVE SENSOR MANUFACTURING EXPERIENCE and engineered for sensitive laboratory and industrial processes, every micro sensor UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS to guarantee precise needle concentricity, zero insulation leakage, and long-term signal stability.
- ✓ Ultra-Thin Micro Sheath: Sheath diameters as thin as Ø 0.8 mm, Ø 1.0 mm, and Ø 1.5 mm for minimal insertion footprint and near-zero displacement.
- ✓ Sub-Second Thermal Response: Low thermal mass needle tip captures core temperature changes in fraction-of-a-second intervals ($t_{0.9} < 0.8\text{ s}$).
- ✓ Class A Precision Calibration: High-stability platinum RTD element delivers unmatched accuracy over thermocouple alternatives.
- ✓ 3-Wire Resistance Compensation: 3-wire electrical layout cancels out lead resistance errors for long cable runs to remote transmitters.
- ✓ Biocompatible 316L Stainless Steel: Corrosion-resistant, food-grade, and medical-grade sheath material suitable for chemical and biological media.
- ✓ High-Flex Shielded Lead Wire: Teflon (PTFE) insulated leads with silver-plated copper braiding resist moisture, chemicals, and mechanical strain.
- ✓ Reliable Quality: Built to withstand repeated insertions into semi-solids, micro-vials, and compact heat sinks.
- ✓ Quality Assured: UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS including multi-point temperature verification, microscopic weld inspection, and insulation resistance testing.
Technical Specifications & Performance Data
| Parameter | Standard Value | Customizable Range | Notes |
| Sensing Element | Pt100 (Platinum Thin-Film) | Pt1000, Dual Pt100 | High-stability miniature RTD chip |
| Accuracy Class | Class A ($\pm 0.15^\circ\text{C}$ at $0^\circ\text{C}$) | Class B, 1/3 DIN, 1/10 DIN | Conforms to IEC 60751 / DIN EN 60751 |
| Temperature Range | -50°C to +250°C (-58°F to +482°F) | -200°C to +400°C | High-temperature ceramic potting available |
| Probe Diameter (Ø) | Ø 1.0 mm / Ø 1.5 mm | Ø 0.8 mm to Ø 2.0 mm | Ultra-fine gauge stainless steel micro tubing |
| Probe Length (L) | 10 mm / 20 mm / 50 mm | Custom tailored (5 mm to 200 mm) | Short lengths minimize stem conduction losses |
| Sheath Material | 316L Stainless Steel | Titanium, Inconel | 316L SS standard for biomedical & chemical inertness |
| Wiring System | 3-Wire System | 2-Wire, 4-Wire System | 3-wire compensates lead resistance in precision PID loops |
| Lead Wire Insulation | Teflon (PTFE) Silver-Braid | Silicone, Kapton | Moisture-proof and chemical-resistant insulation |
| Response Time ($t_{0.9}$) | $< 0.8\text{ seconds}$ (in water) | $< 0.5\text{ seconds}$ (Ø 0.8 mm) | Ultra-fast thermal equilibrium |
| Termination Options | Bare Strip Leads | Spade Lugs, Mini RTD Plugs, M8 | Custom quick-connect options for laboratory instruments |
Industrial Applications & Solutions
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Laboratory & Biological Research: Temperature monitoring in micro-vials, petri dishes, tissue samples, and small-volume liquid assays.
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Micro-Fluidics & Chemical Reactors: Precision spot thermal sensing inside micro-channels, miniature distillation units, and pilot plants.
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Electronics & Semiconductor Testing: Spot temperature verification on power transistors, SMD IC chips, and compact PCB heat sinks during thermal stress testing.
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Medical Equipment & Incubators: Integrated core temperature sensing in medical warming blankets, fluid warming systems, and blood analyzers.
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Precision Food & Pharmaceutical R&D: Core temperature testing in small packaging samples, blister packs, and gel matrices.
High-Performance Micro Probes vs Standard Market Options
| Feature | Our Micro Needle Pt100 | Standard Market Sensors | Your Advantage |
| Micro-Stem Construction | Seamless 316L Precision Tubing | Coarse Welded Tubing | Smooth surface finish, ultra-precise wall thickness, higher mechanical strength. |
| Internal RTD Packing | Micro-Encapsulated Heat Compound | Loose / Air-Gap Insertion | Eliminates air voids, providing sub-second heat transfer and zero thermal lag. |
| 3-Wire Lead Balance | Precision Matched Copper Core | Unmatched Wire Resistance | Accurate 3-wire bridge balancing with zero temperature drift on long leads. |
| Transition Potting | High-Grade Epoxy & Strain Relief | Cheap Glue / Weak Crimping | Transition junction resists moisture ingress and wire pull-out during manual positioning. |
| Quality Assurance | MULTIPLE RIGOROUS QUALITY CHECKS | Basic batch testing only | ZERO DEFECT DELIVERY, ensuring flawless signal precision out of the box. |
Installation & Handling Guidelines
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Stem Handling Caution: Because the needle probe stem is ultra-thin (Ø 0.8 mm–1.5 mm), avoid applying lateral bending force to the tip during insertion. Always align force directly along the longitudinal axis of the probe stem.
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3-Wire Color Code Connection: Connect the two same-colored leads (typically white/white) to the compensation terminals and the third lead (red) to the signal terminal on your RTD transmitter or digital meter.
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Immersion Depth: To achieve maximum Class A accuracy and prevent ambient cooling along the stem, submerge the needle tip to a depth of at least 5 to 8 times the probe diameter into the target medium.
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Thermal Contact Optimization: When measuring solid surfaces or PCB components, use a minute dot of non-conductive thermal grease at the needle tip to eliminate contact thermal resistance.
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Transition Zone Protection: Ensure the transition joint between the stainless needle and flexible lead cable is not subjected to temperatures exceeding 200°C unless a high-temperature ceramic transition was specified.
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Customer Success Stories
Case 1:
Biomedical Analytical Instrument Manufacturer (Germany)
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Application: Micro-volume sample temperature monitoring in automated clinical analyzers.
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Challenge: Standard 3.0mm probes had too much thermal mass, causing temperature drop in 0.5 mL liquid samples during measurement.
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Solution: Custom Ø 1.0mm 3-Wire Pt100 Micro Needle Sensors with 15mm 316L SS sheath and Teflon shielded lead wires.
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Results: ZERO SAMPLE THERMAL DISTURBANCE. “The Ø 1.0mm probe reacts almost instantly without affecting the sample temperature. Readings stabilize within 0.8 seconds with Class A accuracy.”
Case 2:
Semiconductor Thermal Testing Facility (Taiwan)
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Application: Direct die spot temperature measurement during IC burn-in testing.
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Challenge: Thermocouples were picking up high electromagnetic interference (EMI) from neighboring power supplies.
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Solution: Micro Needle 3-Wire Pt100 Probes with grounded silver-braided signal shielding and miniature RTD plugs.
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Results: NOISE-FREE SIGNAL INTEGRITY. “Switching from thermocouples to the 3-wire Pt100 micro probes eliminated EMI noise entirely, giving us rock-solid 0.1°C resolution on our IC test rigs.”
Pricing & Procurement Options
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Standard Production: MOQ 5 pieces. BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE ensuring exact resistance matching and dimensional repeatability across production lots. Tiered volume discounts available for 50+ unit orders.
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Lead Times: Standard Catalog Dimensions (Straight Rods OD 12–30 mm): In stock, 3-5 days. Custom Single/Double Spiral Shapes or Heavy Diameters (OD 35–54 mm): 7-10 days. Express air freight with protective wooden crating.
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Global Logistics: Encased in individual shock-absorbing foam tubes within reinforced wooden export crates to prevent transportation breakage.
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Sample Orders: Custom sample elements produced upon CAD drawing and electrical specification approval. Every shipment UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS prior to dispatch.
Global Certifications & Compliance
- CE Marking
Fully compliant with European safety and environmental standards. - LVD Compliance
Low Voltage Directive tested for continuous thermal load safety. - RoHS Compliant
Constructed using environmentally safe, lead-controlled brass alloys. - ISO 9001
Certified quality control covering CNC machining, coil pressing, and electrical testing.
Quality Documentation: Certificate of Conformity (COC) and insulation resistance test reports included.
Comprehensive After-Sales Support
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- Warranty: 1-Year Comprehensive Warranty covering internal heating element and built-in sensor.
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Technical Support: Application engineers available for wattage distribution calculation, thermocouple calibration, and nozzle fitting assistance.
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Global Response Network: BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE with technical inquiry feedback within 2 hours.
Ready to Optimize Your Injection Molding?
Next Steps:
- 📧 Request Custom Quote – Send your nozzle dimensions, wattage, voltage, and HT-CLW-450 drawing requirements.
- 🔧 Free Design Consultation – Work with our thermal engineers to optimize heat distribution and lead insulation.
- 📦 Order Test Samples – Evaluate thermal performance on your injection molding machine.
- 📞 Contact Hot Runner Experts – Response within 2 hours
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