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Leaf Type CR/AL

Thermocouple

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Leaf Type CR/AL

Thermocouple

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The term leaf type when describing a CR/AL (Chromel/Alumel) thermocouple refers to a specific design of the measuring junction at the tip of the sensor, optimized for surface temperature measurement.
🌡️ Leaf Type CR/AL (Type K) Thermocouple
This sensor is essentially a Type K thermocouple CR/AL that is constructed to make wide, flush contact with a solid surface.
• CR/AL (Type K): This is the most common industrial thermocouple, known for its wide operating range from 0°C to 1260°C.
• Leaf Type Junction: Instead of the typical small, welded bead or an enclosed sheath tip, the measuring junction is formed by two thin, flat pieces of the Chromel and Alumel alloys, creating a small, flexible, flattened “leaf” or paddle shape.
• Purpose (Surface Measurement): The flat, leaf shape maximizes the surface area contact between the junction and the object being measured. This design provides extremely fast response times and high accuracy for surface temperature readings.
• High Thermal Coupling: By maximizing contact, it ensures high thermal coupling, meaning heat transfers very efficiently from the surface to the sensor.
• Minimal Mass: The thin construction minimizes the mass of the measuring tip, reducing the time it takes for the sensor itself to reach the temperature of the surface.

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Product Type

Single Point Aluminium Load Cell

Usage

Table top scales, Counting and postal scales, Check weighers.

Material

Aluminium

Output

 Analog Sensor

Theory

Resistance Sensor

Compensated Temperature

10 To 60 Celsius (oC)

  • Molds and Platens: Measuring the surface temperature of injection molds, extrusion dies, or heated press platens in manufacturing.
  • Pipes and Ducts: Attaching to the outside of pipes or air ducts to measure fluid or air temperature indirectly.
  • Machinery: Monitoring the temperature of engine blocks, motor casings, or other machinery components.
  • In summary, a leaf type CR/AL thermocouple is a fast-response, high-accuracy Type K sensor specifically engineered with a flat, thin junction for optimal surface temperature measurement.

Rated capacity (NM)

5, 10

Excitation Voltage

10 V DC – Maximum 15 V DC

Full Scale Output

2.0 mV / V

Non – Linearity

<± 0. 1 % FSO (Full scale Output)

Hysteresis

<± 0.1% FSO

Non-Repeatability

<± 0.1 % FS0

Creep error (30 minutes)

<± 0.3% FSO

Zero Output

± 1.0 % FSO

Input Resistance

392 ± 10 Ohms

Output Resistance

392 ± 10 Ohms

Insulation Resistance

>1000 Mega Ohms

Safe Overload

150 % of Rated Capacity

Ultimate Overload

250 % of Rated Capacity

Temperature
Compensated Range

10 to 60°C

Temperature Effect at Full Load

<0.05 % FSO/° C

Temperature Effect on
Zero

<0.05 % FSO/° C

Environment Protection

IP 65

Finish & Construction

Stain Less Steel 17-4 PH

Rotational Angular Deflection

< 0.2 at FSO

  • Compact Size
  • Aluminum Construction
  • Custom Design as per Application

Industries

Batching & Mixing Plant
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Silo Weighing
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Hopper Weighing
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FAQs

frequently asked questions

01. What is a temperature sensor and what does it do?

A temperature sensor is a device that gathers information about the thermal energy (heat) of a medium and converts that information into a readable electrical signal. Essentially, it measures heat and outputs a corresponding signal (voltage, current, or resistance) that can be interpreted by a control system or thermometer.

02. What are the three most common types of temperature sensors?

The three most widely used types of temperature sensors are:

  • > RTD (Resistance Temperature Detector): Measures temperature by correlating the resistance of an element (usually platinum, e.g., Pt100) with temperature. RTDs offer high accuracy and stability over a broad range.
  • > Thermistor: Measures temperature using a ceramic or polymer resistor whose resistance changes significantly and rapidly with temperature. They are highly sensitive and typically used for lower temperature ranges.
  • > Thermocouple: Measures temperature using the voltage generated at the junction of two dissimilar metals (the Seebeck effect). They are rugged, self-powered, and used for measuring extremely high temperatures.
03. Why does temperature measurement need to be converted to an electrical signal?

The temperature reading needs to be converted into an electrical signal (like a voltage or current) so it can be:

  • > Read Digitally: Processed, displayed, and recorded by a digital controller, computer, or data logger.
  • > Transmitted: Sent over long distances without loss of accuracy to a centralized control system (e.g., using a 4-20mA transmitter).
  • > Used for Control: Applied as feedback in a control loop (e.g., to turn a heater on or off) to maintain a specific process temperature.
04. What are some common applications for temperature sensors?

Temperature sensing is foundational to industrial control and everyday technology:

  • > Industrial Process Control: Monitoring fluid and gas temperatures in chemical reactors, pipelines, and boilers to ensure safety and quality.
  • > HVAC Systems: Regulating room temperature, monitoring air duct temperature, and controlling heating/cooling cycles.
  • > Food Processing: Ensuring proper cooking, storage, and sterilization temperatures for compliance and safety.
  • > Engine Monitoring: Measuring coolant and exhaust gas temperatures in vehicles and machinery.
05. What is the difference between contact and non-contact temperature measurement?
  • > Contact Sensors: These sensors (like RTDs and Thermocouples) must be physically touching the object or medium they are measuring. They measure the temperature of the sensor tip itself, which then equilibrates with the target medium.
  • > Non-Contact Sensors: These sensors (like infrared thermometers or pyrometers) measure temperature by detecting the thermal radiation (infrared energy) emitted by the object’s surface. They are ideal for measuring objects that are moving, extremely hot, or dangerous to touch.