Radiant India

• K type thermocouple is one of the most widely used thermocouples.

• Materials:

  • Positive leg: Chromel (Nickel-Chromium alloy)

  • Negative leg: Alumel (Nickel-Aluminium alloy)

• Temperature range: roughly −200°C to +1250°C.

• Characteristics:

  • Good accuracy and reliability over wide temperature ranges.

  • Strong resistance to oxidation at high temperatures.

  • Suitable for general-purpose industrial applications.

• Washer type sensors are shaped like a flat disc or ring with a central hole (like a washer).

• Purpose:

  • Designed to mount directly onto a surface using a screw or bolt.

  • Ensures excellent thermal contact for accurate temperature measurement.

  • Compact and mechanically robust.

• Surface temperature measurement: Ideal for bearings, housings, or flat surfaces.

• Fast response time: Due to the thin washer shape and good contact with the surface.

• Durable: Can handle industrial conditions, sometimes with high vibration or pressure.

• Electrical connection: Usually via wire leads or a connector.

• Mounting: Secure via bolt or screw through the central hole.

• Monitoring motor bearings, gearboxes, or housings.

• Measuring surface temperature in machinery.

• Suitable for high-temperature industrial equipment.

• Often used where insertion probes are not feasible, and surface measurement is sufficient.

A Washer Type (Ring Type) K Thermocouple is a flat, ring-shaped surface-mount sensor that uses a K-type thermocouple for wide-range temperature measurement. It combines high-temperature capability, mechanical stability, and surface-mount convenience, making it ideal for industrial equipment monitoring.

A Type J thermocouple is a temperature sensor made from two different metals — Iron (Fe) and Constantan (Copper–Nickel alloy). These metals are joined at one end to form a measuring junction that produces a voltage proportional to temperature.

It is widely used for general-purpose temperature measurement in industrial and laboratory applications.

Key Specifications:

• Thermocouple type: J (Iron–Constantan)

• Temperature range: 0 °C to +750 

• Accuracy Class 2 : ±(1.5 °C or 0.4%)

• Accuracy Class 2 : ±2.2 °C or ±0.75%)

• ANSI color code: White (+, Iron), Red (−, Constantan), Black sheath

• Atmosphere: Suitable for reducing, vacuum, or inert environments; not for oxidizing atmospheres (iron oxidizes easily)

Applications:
Used in heat treatment, plastic processing, food industry, laboratories, and general industrial temperature monitoring.

Summary:

The Type J thermocouple sensor is a low-cost, accurate, and sensitive device for measuring moderate temperatures in non-oxidizing environments, making it ideal for a wide range of industrial applications.

• J Type usually refers to the thermocouple type.

• A thermocouple is a sensor used to measure temperature.

• The J type thermocouple is made of Iron (Fe) and Constantan (Cu-Ni alloy).

• Temperature range: roughly 0°C to +750°C.

• Characteristics:

  • Moderate temperature range.

  • Affordable and widely used.

  • Good for general-purpose industrial applications.

2. Ring Type / Washer Type

• This describes the physical shape of the sensor.

• Ring type (or washer type) sensors:

  • Have a flat circular body with a hole in the center (like a washer).

  • Designed for surface mounting, often screwed or bolted to equipment.

  • Ensures good thermal contact with the surface.

  • Commonly used for measuring the temperature of machine parts, pipes, or housings.

3. Typical Features

• Compact and robust design.

• Easy installation using a screw or bolt through the center hole.

• Can be used in harsh industrial environments.

• Electrical connection may be wire leads or a connector depending on the model.

4. Applications

• Monitoring motor bearings or gearbox surfaces.

• Temperature measurement in pressurized or tight spaces.

• Industrial equipment where direct insertion thermocouples aren’t practical.

Summary:
A J Type Ring (Washer) Sensor is a J-type thermocouple in a ring/washer-shaped housing, designed for surface-mount temperature measurement on machinery, pipes, or other equipment. It combines the temperature sensing ability of a J-type thermocouple with the mechanical convenience of a washer mount.

Summary:

The Type J thermocouple sensor is a low-cost, accurate, and sensitive device for measuring moderate temperatures in non-oxidizing environments, making it ideal for a wide range of industrial applications.

Additional Information:

• Packaging Details: Nos