Temperature Gauge
Temperature gauges are devices used to measure and display the temperature of a substance or environment. Here
are the key technical specifications for temperature gauges:
Description
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.
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.
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.
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.
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)
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)
Diameter: Common sizes include 2.5 inches, 4 inches, and 6 inches (63 mm, 100 mm, 160 mm) for analog
gauges.
gauges.
Mounting Styles: May include threaded, flange, or insertion types, depending on the application
Process Connection: Common types include NPT, BSP, or compression fittings.
Process Connection: Common types include NPT, BSP, or compression fittings.
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).
Sensing Element
Bimetallic: Made from two different metals
Digital: May use thermocouples (various types) or RTDs (commonly PT100).
Coefficient of Resistance: For RTDs, typically around 0.00385 ohms/ohm/°C (PT100)
Typical Response Times:
Bimetallic: 10-30 seconds
Digital: 1 second or less
Infrared: Instantaneous, depending on the scanning rate.
Bimetallic: 10-30 seconds
Digital: 1 second or less
Infrared: Instantaneous, depending on the scanning rate.
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.
Shock and Vibration Resistance: Some gauges are designed to withstand harsh environments.
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).
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).
Industries: Commonly used in HVAC, food processing, chemical processing, manufacturing, and laboratory
settings.
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.