Comprehensive Guide to Humidity and Temperature Sensors: Measurable Data and Technical Specifications

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Humidity and temperature sensors are essential devices used to measure the amount of water vapor present in the air and the ambient temperature, respectively. These sensors play a crucial role in various applications, from environmental monitoring and HVAC systems to industrial processes and scientific research. In this comprehensive guide, we will delve into the measurable data and technical specifications of some of the leading humidity and temperature sensors on the market.

Ellab Relative Humidity and Temperature Sensor

The Ellab Relative Humidity and Temperature Sensor is a versatile device designed for applications within the pharmaceutical industry. This sensor boasts the following technical specifications:

  • Temperature Range: 0 to +90 °C
  • Temperature Accuracy: ± 0.1 °C (in the range of 10 to +90 °C)
  • Relative Humidity Range: 0 to 100% RH
  • Relative Humidity Accuracy: ± 2% RH (calibrated from 10 to 90%)

The Ellab sensor is particularly well-suited for determining humidity levels during the validation of warehouses and stability chambers, ensuring precise environmental monitoring for critical pharmaceutical applications.

DHT11 Sensor

humidity and temperature sensor

The DHT11 sensor is a popular choice for DIY projects and hobbyist applications. This sensor provides the following measurable data and technical specifications:

  • Humidity Range: 20 to 90% RH
  • Humidity Accuracy: ±5% RH
  • Temperature Range: 0 to 50 °C
  • Temperature Accuracy: ±2% °C
  • Operating Voltage: 3V to 5.5V

The DHT11 uses a capacitive measurement technique to determine the amount of moisture in the air, making it a cost-effective and reliable option for a wide range of projects.

HAXO-8 and HAXO-8-CAL Humidity Data Loggers

The HAXO-8 and HAXO-8-CAL humidity data loggers from MicroDAQ offer advanced features and specifications:

  • Measurement Range: -40°C to 85°C @ 0 to 100% RH
  • Battery Life: 2 to 3 years at a 15-minute sampling interval
  • Customizable Alarm Settings: Audible and visual alarms
  • Regulatory Compliance: FDA 21 CFR Part 11 Digital Signatures
  • Logging Features: Push-button start with “Pre-Start” Fail Safe Logging

The HAXO-8-CAL model includes an ISO 17025:2017 Humidity Calibration Certificate, ensuring accurate measurements at 25°C and 50% RH.

UX100-003 Humidity Data Logger

The UX100-003 humidity data logger from Onset provides the following technical specifications:

  • Temperature Range: -20°C to 70°C
  • Temperature Accuracy: ±0.21°C
  • Relative Humidity Range: 15% to 95% RH
  • Relative Humidity Accuracy: ±3.5% RH
  • Data Storage Capacity: 84,650 measurements with date/time stamp
  • Display: LCD showing current readings, alarm, battery, and operating status
  • Power Source: User-replaceable CR-2032 lithium coin cell battery with 1-year life (1-minute sampling rate)

This data logger is designed for indoor environmental monitoring, offering a compact and user-friendly solution for temperature and humidity measurements.

CS215 Air Temperature and Relative Humidity Sensor

The CS215 from Campbell Scientific is a digital sensor with the following technical specifications:

  • Temperature Range: -40 to +60°C
  • Temperature Accuracy: ±0.3°C
  • Relative Humidity Range: 0 to 100%
  • Relative Humidity Accuracy: ±2% RH
  • Output: SDI-12

The CS215 is a versatile sensor that can be integrated into various data acquisition systems, providing reliable air temperature and relative humidity measurements.

Additional Considerations

When selecting a humidity and temperature sensor, it’s essential to consider factors such as the required measurement range, accuracy, resolution, response time, and power consumption, as well as the specific application and environmental conditions. Additionally, factors like sensor calibration, data logging capabilities, and communication protocols (e.g., SDI-12, I2C, or analog output) may be crucial depending on the project requirements.

Conclusion

Humidity and temperature sensors play a vital role in a wide range of applications, from environmental monitoring to industrial process control. By understanding the measurable data and technical specifications of these sensors, you can make informed decisions and select the most suitable solution for your specific needs. This comprehensive guide has provided an overview of some leading humidity and temperature sensors, equipping you with the knowledge to navigate the market and find the perfect fit for your project.

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