In this article, Sensors Vietnam will provide a detailed breakdown of the KLK 100-N by Produal (Finland) - a duct-mounted temperature and humidity sensor that is considered highly cost-effective for HVAC systems requiring high accuracy and stability.

If you are designing an HVAC system or planning to replace a duct temperature and humidity sensor, let’s take a closer look.

DUCT-MOUNTED TEMPERATURE AND HUMIDITY SENSOR KLK 100-N - COMPACT DESIGN

In terms of appearance, the KLK 100-N follows a typical European industrial design philosophy: simple, practical, and highly intuitive rather than overly complex.

The sensor features a relatively compact size of 70 x 95 x 220 mm and a lightweight design at only 122 g, making it smaller than many industrial duct sensors currently available.

The housing is made of PBT engineering plastic with an IP54 protection rating when installed correctly (with the cable or probe facing downward), providing reliable resistance against dust and water. This ensures stable and long-term operation in duct systems, mechanical rooms, and other technical environments.

The probe is constructed from high-grade stainless steel with a length of approximately 150 mm. This standard length is suitable for most duct sizes. Notably, the KLK 100-N includes a mounting flange that secures the sensor firmly to the duct, allows adjustable probe insertion depth, and minimizes air leakage at the installation point.

The KLK 100-N version is equipped with a backlit dot-matrix display, simultaneously showing both temperature and humidity values. This is particularly useful for quick on-site checks without the need for a laptop or central control interface.

For wiring and connections, the sensor uses an M16 cable gland and supports wire sizes from 0.2 to 1.5 mm² (24-16 AWG).

Overall, the KLK 100-N offers a robust industrial design, with a durable enclosure, standard stainless steel probe, and a clean internal layout.

KEY TECHNICAL SPECIFICATIONS OF KLK 100-N DUCT TEMPERATURE AND HUMIDITY SENSOR

Below are the most important technical parameters to consider when selecting the KLK 100-N:

The sensor operates on a 24 Vac/dc power supply (21-28 V) < 2 VA, which is standard for HVAC and BMS systems.

Humidity measurement range: 0-100 %RH
Accuracy (at 25 °C): ±2 %RH (20-80 %RH), maximum ±3 %RH
→ Suitable for HVAC systems, storage environments, and cleanrooms requiring balanced performance between accuracy, cost, and durability.

Temperature measurement range: -50 to 50 °C
Accuracy (at 25 °C): ±0.5 °C
→ Adequate for typical HVAC applications, medium-scale cold storage, and standard supply/return air ducts.

Output signals: 0-10 / 2-10 / 0-5 Vdc, 2 mA / 4-20 mA < 500 Ω
→ Flexible output options allow easy integration with existing control systems.

Recommended operating conditions:
✔️ Temperature: -50 to 50 °C
✔️ Humidity: 0-90 %RH (non-condensing)
✔️ Long-term stability: ±0.5 %RH / 2 years

In summary, while the specifications of the KLK 100-N are straightforward, they provide enough flexibility for integration into modern PLC/BMS systems while ensuring accuracy and long-term reliability.

OPERATING PRINCIPLE OF KLK 100-N DUCT TEMPERATURE AND HUMIDITY SENSOR

In terms of operation, the KLK 100-N is a transmitter capable of simultaneously measuring both humidity and temperature.

Inside the device, it incorporates one capacitive humidity sensor and one temperature sensor (typically resistive or semiconductor-based).

These two sensing elements are integrated into a common processing and linearization unit. This module receives signals from both sensors, then performs filtering, calibration, temperature compensation, and converts them into analog output signals (0-10V or 4-20 mA) corresponding to the configured measurement range.

Additionally, in some versions, Produal allows users to adjust scaling parameters via the ML-SER configuration tool. This enables improved accuracy over narrower measurement ranges when required. For further details, users can contact Sensors Vietnam for consultation.

TYPICAL APPLICATIONS OF KLK 100-N DUCT TEMPERATURE AND HUMIDITY SENSOR

With its duct-mount design, wide measurement range, and high reliability, the KLK 100-N is suitable for the following applications:

• Smart building HVAC systems, shopping malls, offices, and large-scale facilities: measuring temperature and humidity of supply/return air in AHU, PAU, FCU and transmitting data to BMS for fan control, valve regulation, etc.
• Sensitive storage environments such as electronics, vaccines, pharmaceuticals, and food: installed in duct systems to maintain temperature and humidity within acceptable limits, preventing mold growth and product damage, especially during sudden humidity spikes caused by door opening or loading operations.
• Laboratories, cleanrooms, and manufacturing plants in electronics and pharmaceuticals: used for precise humidity control within narrow ranges.
• Greenhouses, farms, and high-tech agriculture applications: monitoring air temperature and humidity in ducts, integrated with misting, ventilation, heating, and cooling systems.

Additionally, the KLK 100-N is commonly used in server rooms, small to medium data centers, libraries, storage areas for valuable assets, and museums.

If your application requires monitoring and controlling duct temperature and humidity within moderate ranges, with a focus on stability, durability, and easy integration, the KLK 100-N is a highly practical solution.

In summary, the KLK 100-N duct-mounted temperature and humidity sensor can simultaneously measure both parameters within air ducts, offering a measurement range suitable for most HVAC, storage, and technical environments. It features flexible output signals and a durable, compact industrial design that simplifies installation and maintenance. Its origin from Produal (Finland) - a reputable manufacturer specializing in HVAC sensors - is also a significant advantage.

If you are operating or designing an HVAC system, this product is definitely worth considering. For detailed information and purchasing inquiries regarding the KLK 100-N duct temperature and humidity sensor, please contact Sensors Vietnam for dedicated support.

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• Genuine PRODUAL temperature sensors of high quality
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