The accessory set for the Chauvin Arnoux C.A 1227 thermo-anemometer includes two measuring nozzles, specifically developed for precise air volume flow measurements. These measuring nozzles are easily attached to the sensor of the device and enable targeted measurements in exhaust and ventilation systems. The application is particularly suitable for tasks in climate technology and for checking ventilation systems, where direct and reliable determination of air volume flow is required.

Applications
The measuring nozzles are used for direct measurement of air volume flow at ventilation and air conditioning systems. The square measuring nozzle with dimensions 346 x 346 mm and the round measuring nozzle with a diameter of 210 mm are designed for different geometries of air ducts and openings. They enable precise capture of airflow, especially in systems where accurate flow measurement is necessary for maintenance, servicing, or compliance with standards.

Functions and Equipment in Detail
The measuring nozzles are designed as accessories for the C.A 1227 thermo-anemometer, which features a dual illuminated display and functions such as Min, Max, average, and HOLD, as well as a cartographic display (MAP mode). The measured values can be read directly on the device, with the measuring nozzles providing the necessary area for volume flow calculation. The measurement is performed via the optically scanned propeller sensor of the device, which detects air speed from 0.25 to 35.0 m/s. Airflow measurement is carried out in the range of 0 to 2,999 m³/h with an accuracy of ± 8 % of the displayed value.

Technology Explained Simply
The measuring nozzles work together with the propeller sensor of the C.A 1227, which measures air speed via optical detection. The measured speed is multiplied by the area of the attached measuring nozzle to calculate the air volume flow. The accuracy of air speed measurement is ± 3 % of the display ± 0.1 m/s. Temperature measurement is performed via a thermistor (NTC) in the range of -20 to +50 °C, with an accuracy of ± 0.8 °C between 0 and 50 °C and ± 1.6 °C between -20 and 0 °C. The measured values can be recorded manually via the device or via programmed recording, with memory capacity sufficient for over one million measurement points.

Compatibility and Accessories
The measuring nozzles are exclusively intended for the C.A 1227 thermo-anemometer. Compatible accessories include the fast charging set (fast charger + 4 NiMH AA batteries), DataView software, the multifunctional magnetic holder Multifix, a transport case, a transport bag (120 x 245 x 60 mm), a USB power adapter, a shock protection sleeve with Multifix, and a Bluetooth BLE / USB modem for PC. These components support the use of the device in various application scenarios, such as mobile measurement or data transfer to a PC.

Mounting and Installation
The mounting of the measuring nozzles is done directly onto the sensor of the C.A 1227. The connection mechanism is designed to allow secure and quick attachment. The devices are designed for an operating temperature of -10 to +60 °C and a relative humidity of 10 to 90 % RH. Power supply is via 3 alkaline batteries (1.5 V LR6) or rechargeable NiMH batteries. An optional mains connection is available via a power supply unit or a micro USB connection. Operating time is 200 hours in portable mode or 8 days with recording at a 15-minute interval.

Operational Advantages
The use of measuring nozzles enables direct and precise measurement of air volume flow without requiring additional calculations or tools. The combination of optical speed measurement and defined areas of the measuring nozzles ensures high reliability of results. The integrated data logging and the possibility of data transfer via Bluetooth or USB allow efficient documentation and evaluation of measurement results. The IP40 protection rating of the housing ensures safe operation indoors under normal operating conditions. Compliance with IEC 61010-1 and IEC 61326-1 ensures safety and electromagnetic compatibility of the device.

The measuring nozzles are delivered in a bag, facilitating transport and storage. The exact dimensions of the measuring nozzles and compatibility with the C.A 1227 are documented in the manufacturer's technical specifications. The application is ideal for professionals in building technology, ventilation technology, and environmental measurement technology who require reliable and fast flow measurement.

Protection Rating
The housing of the C.A 1227 is equipped with a protection rating of IP40, which provides protection against solid foreign objects and splashing water to a limited extent. The operating temperature of the device is between -10 and +60 °C, with relative humidity allowed between 10 and 90 % RH. Measurement is performed via a propeller sensor with optical scanning, detecting air speed from 0.25 to 35.0 m/s. Airflow measurement is carried out in the range of 0 to 2,999 m³/h with an accuracy of ± 8 % of the displayed value. Temperature measurement is performed via a thermistor (NTC) in the range of -20 to +50 °C, with an accuracy of ± 0.8 °C between 0 and 50 °C and ± 1.6 °C between -20 and 0 °C. The measured values can be recorded manually via the device or via programmed recording, with memory capacity sufficient for over one million measurement points. Power supply is via 3 alkaline batteries (1.5 V LR6) or rechargeable NiMH batteries. An optional mains connection is available via a power supply unit or a micro USB connection. Operating time is 200 hours in portable mode or 8 days with recording at a 15-minute interval. Compliance with IEC 61010-1 and IEC 61326-1 ensures safety and electromagnetic compatibility of the device. The measuring nozzles are delivered in a bag, facilitating transport and storage. The exact dimensions of the measuring nozzles and compatibility with the C.A 1227 are documented in the manufacturer's technical specifications. The application is ideal for professionals in building technology, ventilation technology, and environmental measurement technology who require reliable and fast flow measurement.