Description

Types:

• Bimetallic Gauges: Measure temperature using a bimetallic strip that expands and contracts with
  temperature changes.
• Glass Thermometers: Use liquid (like mercury or alcohol) in a glass tube to indicate temperature.
• Digital Thermometers: Use electronic sensors (such as thermocouples or RTDs) to provide digital temperature readings.
• Infrared Thermometers: Measure temperature from a distance by detecting infrared radiation emitted by
  an object.

Measurement Range:

• Temperature Range: Varies by type; common ranges include:
  • Bimetallic: -50°C to +600°C (-58°F to +1112°F)
  • Glass Thermometers: -200°C to +350°C (-328°F to +662°F)
  • Digital Thermometers: -200°C to +1000°C (-328°F to +1832°F)
  • Infrared: -50°C to +1000°C (-58°F to +1832°F)
• Glass Thermometers: Use liquid (like mercury or alcohol) in a glass tube to indicate temperature.
• Digital Thermometers: Electronic sensors (such as thermocouples or RTDs) provide digital temperature readings.
• Infrared Thermometers: Measure temperature from a distance by detecting infrared radiation emitted by
  an object.

Accuracy:

• Typical Accuracy:
  • Bimetallic: ±1% of full scale
  • Digital: ±0.5°C or ±1°F (varies by model)
  • Infrared: ±1°C or ±1.5°F (depending on distance-to-spot ratio)

Dial Size:

• Diameter: Common sizes include 2.5 inches, 4 inches, and 6 inches (63 mm, 100 mm, 160 mm) for analog
  gauges.

Connection Types:

• Mounting Styles: May include threaded, flange, or insertion types, depending on the application
• Process Connection: Common types include NPT, BSP, or compression fittings.

Materials:

• Case Material: Typically, stainless steel, brass, or plastic.
• Sensing Element
  • Bimetallic: Made from two different metals
  • Digital: May use thermocouples (various types) or RTDs (commonly PT100).

Temperature Coefficient:

• Coefficient of Resistance: For RTDs, typically around 0.00385 ohms/ohm/°C (PT100)

Response Time:

• Typical Response Times:
  • Bimetallic: 10-30 seconds
  • Digital: 1 second or less
  • Infrared: Instantaneous, depending on the scanning rate.

Environmental Protection:

• Ingress Protection (IP): Ratings may be specified (e.g., IP65) for dust and water resistance.
• Shock and Vibration Resistance: Some gauges are designed to withstand harsh environments.

Additional Features:

• Liquid-Filled Gauges: Some analog gauges are filled with liquid (like glycerin) to dampen vibrations and
  protect against shock.
• Calibration: Many gauges can be calibrated to ensure accuracy over time.
• Digital Output: Digital models may include features like data logging, alarms, and connectivity options
  (e.g., USB, Bluetooth).

Applications:

• Industries: Commonly used in HVAC, food processing, chemical processing, manufacturing, and laboratory
  settings.

When selecting a temperature gauge, it’s essential to consider the specific requirements of your application,
including temperature range, accuracy, environment, and the medium being measured.