Temperature and Humidity Sensor

Temperature and humidity sensors are essential tools utilized in numerous applications for monitoring environmental conditions. These sensors, also known as hygrometers, give accurate readings of the air's humidity levels at any specific point or location. They are often required in environments where extreme air conditions are present or where precise control over air conditions is needed for various reasons. The term humidity refers to the amount of water vapor present in the air, a factor that can influence both personal comfort and several industrial processes. For example, in the semiconductor industry, maintaining precise humidity levels is crucial for proper wafer processing. Control over humidity is also vital in areas like incubators, respiratory devices, sterilization equipment, and in the handling of biological products. Water vapor's presence can further impact many chemical, biological, and physical operations. The importance of humidity temperature meters extends beyond comfort, impacting industrial efficiency, personnel health and safety, and even product cost. A higher humidity level can make the air feel warmer, an aspect that must be considered in various industries. Thus, the role of temperature humidity sensors is paramount, providing critical data for numerous applications.

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Working Principle of Temperature Humidity Sensor

Relative humidity sensors typically consist of a humidity-sensing component coupled with a thermistor for temperature measurement. In the case of a capacitive sensor, the sensing element takes the form of a capacitor. This design relies on detecting changes in the electrical permittivity of the dielectric material, allowing for the calculation of relative humidity values. In constructing a Resistive sensor, materials with low resistivity are employed. This resistive material, situated atop two electrodes, undergoes changes in resistivity that correspond to variations in humidity, thus enabling its measurement. Examples of resistive materials utilized in Resistive sensors include salt, solid electrolytes, and conductive polymers. In contrast, thermal conductive sensors are used to gauge Absolute humidity values, providing a different approach to humidity measurement.

Ambient Temperature Sensor

How to Choose the Ideal Temperature and Humidity Sensor for Your Project?

When selecting a temperature and humidity sensor, several factors must be considered to ensure a successful project and prolonged product lifespan. For the optimal choice of a temperature and humidity sensor for your particular application, it's essential to take into account the following considerations:

Frequency Response Characteristics

The specific frequency range to be measured is governed by the sensor's frequency response traits. It's vital that the monitoring conditions remain undisturbed within the allowed frequency range. Additionally, the sensor response may have some delay. Therefore, the sensor's frequency response should be high, and the range of the signal that can be measured must be wide. Conversely, if the sensor's measurable signal frequency is low, the frequency will be low as well.

Linear Range

When selecting a sensor, you must first ensure that its range meets the requirements, after identifying the sensor type. The linear range is defined as the range where the output is directly correlated to the input for the temperature and humidity device. Theoretically, sensitivity remains constant within this range. The broader the linear range of the sensor, the larger its range will be, ensuring a certain degree of measurement precision.

Stability

Stability refers to the ability of the temperature and humidity sensor to maintain consistency over time. The most significant factor affecting its long-term stability is the environment in which the sensor will be used. Prior to selecting a sensor, it's wise to investigate its compatibility with the environment where you intend to produce the products. Subsequently, you can select the most dependable sensor for that specific environment.

Specifications
Plate Diameter 196 mm
Measuring Range 0 to 100 °C
Sensor PT100 Class A
Supply Voltage 12 to 24 VDC
Protection IP-67
Response < 15 secswith out filter
Protection IP-65 for Transmitter
Plate Height 110mm
Accuracy ±0.5 °C
Housing Electronics Poly carbonate watertight enclosure
Poly carbonate watertight enclosure 12 to 26 VDC
Housing ABS plastic watertight enclosure

Key Features

Reliable performance for solar monitoring applications

Fast, Stable & Accurate

Delivers precise humidity readings with excellent response time and long-term stability.

IP65 Weatherproof Enclosure

Built for harsh outdoor conditions with durable, dustproof and waterproof protection.

Onsite Two-Point Calibration

Easy calibration process ensures high accuracy for field installations.

Loop Powered

Low power consumption with simple installation and wiring.

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Frequently Asked Questions

Find answers to the most common queries below

A temperature and humidity sensor (also called a hygrometer) measures the amount of water vapor in the air along with the current temperature. It helps monitor environmental conditions in industrial, commercial, and residential applications.

These sensors are widely used in semiconductor manufacturing, incubators, HVAC systems, food storage, pharmaceutical labs, sterilization equipment, climate control systems, and biological product handling.

Most sensors use either capacitive, resistive, or thermal conductive technology: Capacitive: Measures changes in dielectric permittivity Resistive: Detects changes in resistance of a humidity-sensitive material Thermal: Measures absolute humidity through heat conductivity differences

This sensor measures temperatures from 0 to 100°C using a PT100 Class A element.

Key factors include: Frequency response Sensor linear range Environmental stability Required accuracy Operating conditions Housing and protection rating

Frequency response determines how quickly the sensor detects changes in humidity or temperature. A fast response ensures more accurate real-time measurements, especially in dynamic environments.

The linear range is the range where the sensor output is directly proportional to the input. A wider linear range ensures better accuracy and a broader measurement capability.

Environmental conditions—such as humidity, dust, chemicals, and temperature extremes—directly impact long-term sensor stability. Using a sensor designed for your environment improves reliability.