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7Semi PT100 RTD 3-Wire Temperature Sensor Probe

7Semi PT100 RTD 3-Wire Temperature Sensor Probe

₹501.00Price
🌡️ 7Semi PT100 RTD 3-Wire Temperature Sensor Probe — Technical Information
🔍 Overview
The 7Semi PT100 RTD 3-wire temperature sensor probe is a high-accuracy resistance temperature detector (RTD) based on a platinum sensing element (Pt100).
  • Measures:
    • Temperature
  • Type:
    • 3-wire RTD configuration
  • Output:
    • Resistance (analog, requires signal conditioning)
👉 Designed for precision temperature measurement with improved accuracy over 2-wire RTDs.
⚙️ Working Principle
🧠 RTD (Resistance Temperature Detection)
  • Uses platinum (Pt100) element
  • Resistance varies with temperature
📐 RTD Relation
RT=R0(1+αT)R_T = R_0 (1 + \alpha T)RT​=R0​(1+αT)
Where:
  • R0=100 ΩR_0 = 100 \, \OmegaR0​=100Ω at 0°C
  • α≈0.00385/°C\alpha \approx 0.00385/°Cα≈0.00385/°C
  • TTT = temperature
🔄 Operation
  • Constant current flows through RTD
  • Temperature change → resistance change
  • Measured resistance → converted into temperature
👉 Provides highly linear and stable measurement.
📊 Measurement Characteristics
  • Temperature range: typically −50°C to +250°C (probe dependent)
  • Base resistance: 100Ω @ 0°C
  • Accuracy: high (often Class B or better)
  • Linearity: excellent
⚡ Electrical Characteristics
  • Passive sensor (no internal electronics)
  • Requires:
    • Constant current source
    • RTD interface circuit
🔗 3-Wire Configuration
✔ Principle
  • Uses three wires instead of two
  • Compensates for lead wire resistance
✔ How It Improves Accuracy
  • Two wires measure resistance
  • Third wire helps cancel:
    • Cable resistance error
👉 More accurate than:
  • 2-wire RTD
    👉 Slightly less accurate than:
  • 4-wire RTD
🧠 Internal Features
✔ Platinum Sensing Element
  • High stability
  • Low drift over time
✔ Lead Resistance Compensation
  • Reduces measurement error in long cables
✔ Wide Temperature Range
  • Suitable for:
    • Industrial processes
    • Laboratory measurements
🔧 Mechanical Characteristics
  • Probe material: Stainless steel
  • Cable type: 3-wire insulated cable
  • Designed for:
    • Harsh environments
    • Liquid and surface sensing
🔄 Operating Behavior
✔ High Precision Measurement
  • Accurate and repeatable readings
✔ Stable Output
  • Low noise and drift
✔ Moderate Response Time
  • Depends on probe size and medium
🌡️ Environmental Characteristics
  • Suitable for:
    • Liquids
    • Air
    • Industrial surfaces
⚠️ Limitations
  • Requires:
    • External RTD interface (e.g., amplifier or ADC)
  • Slower than thermocouples
  • Slightly more complex wiring than 2-wire RTD
🔌 Typical Connection
  • Wire 1 & 2: measurement leads
  • Wire 3: compensation lead
🧩 Functional Role
The probe acts as a:
  • High-precision temperature sensor
  • Industrial thermal measurement device
  • Resistance-based sensing element
🏁 Summary
The 7Semi PT100 3-wire RTD probe is a precision temperature sensing solution that:
  • Uses platinum RTD technology (Pt100)
  • Provides high accuracy and stability
  • Reduces error via 3-wire compensation
  • Requires external signal conditioning
  • Is ideal for industrial and scientific temperature measurement systems
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