Technical data
Application sites MSR	outdoor
Compatibility with central unit	ALL4176
Sensor type	Temperature
Construction type	wired

The Allnet MSR sensor ALL3020 is a wired environmental sensor for measuring air temperature and relative air humidity. It is designed for use in IP building automation systems and serves for continuous acquisition of climate data in indoor and outdoor environments. The sensor features a measurement range of -40 °C to +125 °C for temperature and 0 % to 100 % relative humidity (RH). The resolution is 0.01 °C for temperature and 0.01 % RH for humidity, enabling precise representation of measured values.

Applications

The sensor is suitable for use in indoor and outdoor environments, with the specification “outdoor” confirmed in the technical data. It can be used in various applications, such as in buildings for monitoring room climate or production environments, in greenhouses, warehouses, or in technical processes where precise measurement of temperature and humidity is required. Compatibility with various MSR central units enables flexible integration into existing building automation infrastructures.

Functions and Equipment in Detail

The sensor measures ambient temperature with an accuracy of approximately ±0.6 °C across the entire measurement range. In the typical range of -20 °C to +90 °C, the accuracy is ±0.2 °C. Relative air humidity is measured with an accuracy of approximately ±3 % across the entire range, with a typical accuracy of ±1.5 % RH in the range of 0 % to 80 % RH. The repeatability of the measured values is very high, with typical values of 0.04 °C (temperature) and 0.08 % RH (humidity). The long-term drift is minimal, with a maximum of <0.03 °C/yr for temperature and <0.25 %RH/yr for humidity, indicating high long-term stability.

Technology Explained Simply

The sensor operates with an integrated humidity sensor, which has a response time of 86 seconds (t63%), meaning it reaches 63 % of the final measured value within this time. Temperature measurement has a response time of >2 seconds (t63%), enabling rapid reaction to temperature changes. The term “wired” means the sensor is connected to the central unit via a fixed connection cable with a length of 1.5 meters.

Compatibility and Accessories

The sensor is compatible with various MSR central units from the Allnet product family, including models such as ALL3419, ALL3500, ALL3500v2, ALL5000, ALL5000v2, ALL4500, ALL4176, and ALL3692. These central units offer different numbers of sensor ports and features, such as WLAN connection or 48,3 cm ( 19 inch ) mounting, and enable integration of the sensor into comprehensive building automation solutions. The mentioned central units are available as accessories and can be used to expand system functionality.

Mounting and Installation

Installation is performed via the 1.5 m long connection cable, which is directly connected to the corresponding central unit. The sensor’s positioning should be chosen so that it is representative of the environment being measured, avoiding direct influences such as sunlight or heat sources.

Advantages in Operation

The sensor offers high measurement accuracy and repeatability, which is crucial for reliable data in building automation applications. The low long-term drift ensures stable performance over extended periods. Compatibility with a wide range of central units enables flexible system expansion and integration into existing infrastructures. The wired design ensures stable and interference-free data transmission, without the need to rely on wireless connections.

Batteries are not included in the delivery scope.