Humidity transmitters, also known as humidity transducers or humidity sensors, play a central role in monitoring and controlling air humidity in various applications. Our humidity transducers offer precise humidity measurement, standardized output signals, and an optional temperature measurement feature – this option can be conveniently selected in our online configurator.
We have compiled a guide for you on what to consider when selecting, purchasing, installing, and operating your humidity transmitter.
What is a humidity transmitter?
A humidity transmitter measures air humidity and converts it into a standardized electrical signal, which can be further processed in controllers or regulators as well as displays. All of our transmitters are equipped with DIP switches, which allow for easy configuration without the need for additional software. They also offer the option to measure temperature in addition to humidity.
How does a humidity transducer work?
A humidity transducer works by measuring the relative or absolute humidity in the environment. A sensor element detects the ambient humidity and converts this information into an electrical signal, which is standardized, for example, as a 0-10 V or 4-20 mA signal. This way, the humidity can be accurately transmitted to a controller or display, even over long distances.
What is humidity measurement?
Humidity measurement is the process of measuring the air humidity in the environment, which is the amount of water vapor in the air. It distinguishes between relative and absolute humidity, as well as the dew point.
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Relative humidity: It indicates the percentage of current water content in the air compared to the maximum amount of water that the air can hold at a given temperature. At 100% relative humidity, the air is saturated, and condensation (fog, dew) can occur.
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Absolute humidity: It refers to the actual amount of water vapor in the air, measured in grams of water per cubic meter of air (g/m³). It is independent of temperature and provides a precise measurement of the water vapor content in the air.
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Dew point: The dew point is the temperature at which the air cools down enough for the contained water vapor to condense into liquid. It indicates the point at which the air is saturated with humidity.
For which applications do I need a humidity transducer?
A humidity transducer is used in applications where the precise monitoring of air humidity is critical. These include building climate control, industrial drying processes, storage monitoring, or clean rooms, where stable environmental conditions are required. By combining humidity and temperature measurement, humidity transducers can also be used in complex HVAC systems (heating, ventilation, air conditioning) and in the food and pharmaceutical industries to ensure the quality and safety of products.
Types of Humidity Transmitters
Depending on the application, there are various types of humidity transmitters that are developed for specific use cases:
- Outdoor Humidity Transmitter: These outdoor humidity probes are specially designed for the measurement of outdoor air. They are robust and compact, providing accurate measurements under changing outdoor conditions. They are often used in building monitoring, agriculture, or in outdoor installations where the humidity of the outside air needs to be measured. You can purchase these humidity transmitters from us to efficiently manage your outdoor applications.
- Room Humidity Transmitter: Roomhumidity transmitters or indoor humidity probes are used in indoor environments and are especially suitable for monitoring indoor air in offices, residential buildings, or industrial buildings. They provide precise measurements and help maintain an optimal indoor climate, enhancing both energy efficiency and the well-being of the occupants or ensuring product quality in industrial environments. Purchase our indoor humidity transmitters to support your indoor applications optimally.
- Duct Humidity Transmitter: Duct humidity transmitters or duct humidity probes are installed directly in ventilation or air conditioning ducts. These devices measure the humidity of the airflow and provide a precise climate control in complex ventilation systems, which is essential in buildings or industrial processes. If you require accurate humidity measurements in these areas, you can purchase our duct humidity transmitters.
- Pendulum Humidity Transmitter: Pendulum humidity transmitters, also known as pendulum humidity probes, hang from a cable and are ideal for high ceilings or locations where direct mounting is not possible. They are often used in warehouses or industrial buildings, where a flexible and freely hanging measurement of humidity is necessary. If you need a flexible solution for your humidity measurement, you can purchase our pendulum humidity transmitters.
What factors can affect the lifespan and performance of a humidity transmitter?
The lifespan and performance of a humidity transmitter depend on several factors, mainly the operating environment, such as contaminants, dust, or high humidity, which can strain the sensor. Extreme temperature fluctuations or aggressive chemicals can also affect measurement accuracy. Regular maintenance, cleaning, and, if necessary, calibration of the device are essential to extend its lifespan and detect measurement deviations early. Proper protection, such as using protective caps or a sun shield, can provide additional protection in demanding environments and help ensure stable measurement results.
Where can I find all the technical data for the humidity transmitters?
All technical data and important information about our humidity transmitters can be found directly on the respective product pages or here in the download section. There you can download the relevant data sheets, operating instructions, and declarations of conformity. These documents contain detailed specifications, installation instructions, and guidelines for safe use.
Downloads |
Transmitter | Data sheet | Instruction manual | Declaration of conformity |
Pendulum Humidity Transmitter |
Pendulum humidity transmitter 4-20 mA | | | |
Pendulum humidity transmitter with housing 0-10 V | | | |
Pendulum humidity transmitter with display 0-10 V | | | |
Pendulum humidity transmitter with housing 4-20 mA | | | |
Pendulum humidity transmitter with display 4-20 mA | | | |
Outdoor Humidity Transmitter |
Outdoor humidity transmitter 0-10 V | | | |
Outdoor humidity transmitter with display 0-10 V | | | |
Outdoor humidity transmitter 4-20 mA | | | |
Outdoor humidity transmitter with display 4-20 mA | | | |
Room Humidity Transmitter |
Room humidity transmitter 0-10 V | | | |
Room humidity transmitter with display 0-10 V | | | |
Room humidity transmitter design 0-10 V | | | |
Room humidity transmitter 4-20 mA | | | |
Room humidity transmitter with display 4-20 mA | | | |
Room humidity transmitter design 4-20 mA | | | |
Duct Humidity Transmitter |
Duct humidity transmitter 0-10 V | | | |
Duct humidity transmitter high 0-10 V | | | |
Duct humidity transmitter high with display 0-10 V | | | |
Duct humidity transmitter 4-20 mA | | | |
Duct humidity transmitter high 4-20 mA | | | |
Duct humidity transmitter high with display 4-20 mA | | | |
What accessories can I use with the humidity probes?
We offer a selection of practical accessories for our humidity probes to ensure the measurement accuracy and longevity of the sensors. These include sintered caps made of stainless steel or plastic, which protect the sensor from dust, dirt, and other environmental influences. Additionally, we offer sunshields to protect the probes from direct sunlight and overheating, ensuring measurement accuracy even under strong UV exposure.
Frequently Asked Questions about Humidity Transmitters
What is the difference between relative and absolute humidity?
Relative humidity indicates the ratio of the current water vapor content in the air to the maximum possible amount, expressed as a percentage. Absolute humidity, on the other hand, describes the actual amount of water vapor in grams per cubic meter of air. Both values are important, depending on whether you want to monitor climatic conditions or precise humidity values.
How accurate is a humidity transmitter?
Humidity transmitters measure relative or absolute humidity in the environment with precision. Accuracy varies depending on the model and application, but high-quality transmitters often offer accuracies of ±2% relative humidity or better. Additionally, external factors such as temperature and contamination can affect the measurement.
Why should I measure humidity?
Monitoring humidity is essential to prevent condensation, mold growth, and corrosion. In industrial processes, humidity measurement helps optimize production conditions, while in building technology, it ensures air quality.
How long does a humidity transmitter last?
The lifespan of a humidity transmitter depends heavily on usage and the environment (e.g., contamination). Typically, humidity transmitters have a long lifespan of many years, especially when regularly maintained and cleaned if necessary. Calibration adds additional security and can detect potential drift early.
How do I install a humidity transmitter?
Installing a humidity transmitter is easy and depends on the design. Room, outdoor, duct, and pendulum humidity transmitters can usually be mounted directly with simple screws depending on the location. Thanks to DIP switches, on-site parameterization is simple and quick to perform. Instructions can be found in our installation guide.
What are the advantages of a combined humidity and temperature measuring device?
Our humidity transmitters optionally offer the possibility to also measure temperature. This allows for comprehensive monitoring of the room climate or industrial environments, as temperature and humidity are closely linked. This saves costs and space as only one device is needed for two measurements.
What environmental factors can affect the measurement?
Extreme temperatures, dust, and chemical fumes can affect the accuracy of a humidity transmitter. Therefore, ensure that the transmitter is suitable for the specific environmental conditions in which it is used.
Are humidity transmitters maintenance-intensive?
Modern humidity transmitters are generally low-maintenance. Depending on the application area, additional protective measures may be necessary to maximize the device's lifespan (e.g., protective caps to prevent contamination or additional weather protection housings for outdoor use). Calibration provides additional security and can detect potential drift early.
What should I consider when purchasing a humidity transmitter?
Consider the design, measurement range, and signal type (e.g., 0–10 V or 4–20 mA). Choose a transmitter that fits your application, whether for outdoor, indoor, or ventilation systems.
Where can I find all technical data and specifications for my humidity transmitter?
All technical data and specifications for your humidity transmitter can be found on the respective product pages in our online shop or here for direct download. There you will find detailed information about specifications, features, and accessories.
Do the transmitters require power at the connection?
Yes, humidity transmitters require a power supply to capture the measurements and transmit the signal to a controller or regulation system. Information on the exact power supply can be found in the technical data on the product pages.
What accessories do I need for my transmitter?
All relevant accessories for your humidity transmitter can also be found on the respective product page or here. There you will find an overview of suitable accessories that are optimally matched to the device.