Devices

CONSTANT TEMPERATURE ANEMOMETER (by DANTEC)

The StreamLine system is Dantec Dynamics' research grade anemometer solution for advanced flow and turbulence diagnostics. CTA (Constant Temperature Anemometry) using the principle of standard temperature of hot wire. This method eliminates the shortcomings of conventional methods of measuring the speed (directional insensitivity of probes, numbness of probes when measuring small velocity and deformations of in particular vane anemometers when used for measuring speed greater than 30 m/s). CTA method is suitable for measuring the speed range from the cm/s up to the speed of sound, with an accuracy (error) of less than 1%. It measures both instantaneous air velocity and temperature. The sensor is connected via an A/D converter and application software LabVIEW ™ to personal computer. The speed of air flow and air temperature are sampled 10 times per second. After completion of a predetermined time period of data collection (usually min.180 s), the system evaluates the mean flow velocity wa, mean air temperature ta, turbulence intensity Tu for the place where the sensor is located.

INNOVA AIR TECH INSTRUMENTS (by INNOVA)

The dispenser and collector of samples allows, along with a gas analyser, to carry out comprehensive measurements of intensity of ventilation and indoor air quality evaluation. The department has two devices from Innova. The first one is a photoacoustic gas analyser (type 1312), the second one is a dispenser and sample collector (type 1303). Gas analyser operates using photoacoustic infrared detection.It thus allows to measure the concentration of nearly all gases that absorb infrared light. Our device has an internal carousel two optical filters for measuring concentrations of gases CO2 and SF6. Variably can be fitted with a filter for measuring gas concentrations of N2O. Dispenser and sample collector 1303 enables, together with a gas analyser 1312, to carry out comprehensive measurements of intensity of ventilation and indoor air quality evaluation.The marker gas is led by the dispenser to six different locations within the required distance (max. 50 m). According to the measurement objectives is set the amount and intensity of dosing. The air from assessed room is then sucked by unit in 1303 and transported for evaluation into the analyser 1312. The devices can be used in many applications. The most common include determining an average or instantaneous intensity of ventilation in the room, determine the flow in the duct, evaluating the effectiveness of the distribution of air in the ventilated space and analysing flow between multiple zones.

DATA LOGGER AHLBORN ALMEMO (by AHLBORN)

Data logger Ahlborn ALMEMO 5590-3 is used to collect large amounts of measurement data. It contains six measuring cards, each with ten channels. Using appropriate sensors can be measured e.g. temperature, humidity, and air flow velocity. For temperature measurements are used e.g. resistance thermometers Pt100 (four-wire connection) or negative Ntc (two-wire connection). Data logger is linked with sensors via connectors ZA 9030-FS or ZA 9040-FS. For measuring relative humidity of air is used a capacitive sensor type FHA6461. Flow velocity is measured by wire thermoanemometer MT8455. The system also allows to measure the following physical parameters: [°C, %rH, m/s, km/h, lux, V, mV, A, mA, Ohm, Hz, Ot/min, N, Kg, Pa, Bar, Atm, mm, m, cm, g/kg, kJ/kg, W/m2, ppm, mS, pH, rpm, l/min]

OMNIDIRECTIONAL ANEMOMETER HT400 (by SENSOR)

Omnidirectional anemometers HT400 are probes intended to measure primarily low speeds and temperature. They deduct instantaneous speed in the form of a scalar quantity and the current temperature. These data are subsequently processed by collection station and a computer program that evaluates the average speed and temperature, mean square deviation rate in speed, the risk of drafts and turbulence intensity in the measured point. The probes are primarily used to measure airflow in the room, and indoor environmental quality assessment in terms of thermal comfort. The department has a set of 16 probes.

• type of sensor: omnidirectional, spherical, diameter d = 2 mm
• measured speed range: 0.05 - 5 m/s
• repeatability: ranges from 0.05 to 1 m/s ± 0.02 m/s ± 1% of recording, range from 1-5 m/s ± 3% of recording
• temperature range: -10 to +50 °C
• temperature measurement accuracy: 0.2 °C