Type E Thermocouple Bare Wire (EP/EN) – 1.6mm Diameter
High-Sensitivity Grade
Product Overview
This Type E thermocouple bare wire from Huona is a
high-sensitivity, mid-temperature thermoelectric pair consisting of
EP (Chromel, positive leg) and EN (Constantan, negative leg),
purpose-built for precision low-to-medium temperature applications.
Manufactured via precision drawing and controlled annealing, this
heavy-gauge wire delivers exceptional Seebeck coefficient,
excellent corrosion resistance, and robust mechanical performance,
making it ideal for process control, cryogenic systems, and
chemical processing where high signal output and long service life
are critical.
Core Specifications
- Product Name: Type E Thermocouple Bare Wire (EP/EN Pair,
High-Sensitivity)
- Alloy Composition:
- EP (Positive Leg): Chromel (Ni: ~90%, Cr: ~10%)
- EN (Negative Leg): Constantan (Cu: ~55%, Ni: ~45%)
- Diameter: 1.6mm (customizable: 1.0–3.0mm)
- Tolerance: ±0.015mm
- Form: Coil (standard length: 50m/leg; custom lengths available)
- Thermoelectric Performance:
- Accuracy Class: IEC Class 1 (±1.5°C or ±0.4% of reading, whichever
is greater)
- Thermoelectric Power: ~60.0 µV/°C at 100°C (highest among common
base-metal thermocouples)
- Operating Temperature Range: -270°C ~ 800°C (continuous use;
optimized for cryogenic to mid-range industrial processes)
- Standards Compliance: IEC 60584-1, ASTM E230, GB/T 4989, RoHS 2.0
- Manufacturer: Huona (Shanghai) New Material Co., Ltd.
Key Differentiating Advantages
1. Industry-Leading Thermoelectric Sensitivity
Type E wire offers the highest Seebeck coefficient (~60 µV/°C) of
any common base-metal thermocouple, delivering significantly
stronger output signals than Type K, J, or T. This results in
improved measurement resolution and noise immunity, making it ideal
for low-temperature applications where small temperature changes
need to be detected accurately.
2. Excellent Corrosion & Oxidation Resistance
The Chromel-Constantan pair exhibits superior resistance to
corrosion in acidic, reducing, and marine environments compared to
iron-based (Type J) or nickel-based (Type K) wires. It is also
highly resistant to hydrogen embrittlement, making it suitable for
chemical processing and cryogenic applications.
3. Robust Mechanical Durability for Continuous Use
The 1.6mm diameter provides a balanced combination of strength and
flexibility, with high tensile strength (≥650 MPa) and resistance
to thermal fatigue. It withstands repeated thermal cycling without
cracking or deformation, ensuring long-term reliability in
industrial process control systems.
4. Stable Performance Across Wide Temperature Ranges
Type E wire maintains consistent thermoelectric properties from
cryogenic temperatures (-270°C) up to 800°C, with minimal drift or
hysteresis. This versatility makes it suitable for applications
ranging from liquid nitrogen storage tanks to industrial ovens.
5. Low Drift & High Accuracy for Precision Applications
Unlike Type J (which suffers from oxidation above 500°C) or Type K
(prone to green rot above 800°C), Type E wire maintains stable
readings up to 800°C with minimal drift. This makes it ideal for
precision process control in pharmaceutical manufacturing, food
processing, and semiconductor production.
Technical Specifications Table
| Attribute | Value (Typical) |
|---|
| Alloy Grade | EP (Chromel) / EN (Constantan) |
| Diameter | 1.6mm (±0.015mm) |
| Form | Coil |
| Accuracy Class | IEC Class 1 |
| Operating Temperature | -270°C ~ 800°C (continuous) |
| Tensile Strength | ≥650 MPa (EP), ≥450 MPa (EN) |
| Elongation | ≥20% (EP), ≥30% (EN) |
| Surface Finish | Dark, oxide-free finish (optimized for corrosion resistance) |
| Packaging | Moisture-proof, anti-oxidation coil packaging |
Typical Applications
- Chemical & Pharmaceutical Processing: Temperature monitoring in
reactors, distillation columns, and sterilization equipment.
- Cryogenic Systems: Temperature sensing in liquid nitrogen storage
tanks, cryogenic freezers, and low-temperature research labs.
- Food & Beverage Manufacturing: Process control in ovens,
pasteurizers, and fermentation tanks.
- Semiconductor & Electronics: Thermal monitoring in manufacturing
equipment and environmental test chambers.
- Marine & Offshore: Corrosion-resistant temperature sensing in
shipboard equipment and offshore platforms.
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