This rectangular airflow measurement unit is available in various different sizes. Accurate measurement based on differential pressure by measurement probe pipes.
|100, 150, 200, 250 …1600||100, 150, 200, 250 …1000|
|Measurement probe pipes||Aluminium|
|Measurement tubes||PVC and PP plastic|
Air flows through the measurement unit, which is installed tightly into the ductwork.
Airflow in a duct creates a pressure difference between the front and rear probes. The corresponding airflow rate can be defined by measuring the pressure difference sensed by the averaging probes.
Respect the safety distances between the measurement unit and flow disturbances (e.g. bends (2), T-branches (1)) presented in figure below in order to ensure the accuracy of the flow measurement. Installation is independent of airflow direction.
The hydraulic diameter is calculated using the formula below:
d h = 2x WxH / (W+H)
Connect the measurement tubes to the measurement taps and to a manometer.
Read the pressure difference between the probes.
The airflow rate is calculated using the formula below or by reading the airflow rate directly from the diagram described in the performance section.
qv Calculated airflow rate, l/s
k k-factor (see formula below)
Δpm Measured differential pressure, Pa
Formula for k-factor calculation:
k = W (mm) x H (mm) x 0,001054
W Unit width (mm)
H Unit height (mm)
The casing of the measurement unit is made of galvanised steel.
The measurement probe pipes is made of aluminium.
Measurement shall be based on the principle of dynamic pressure difference created by airflow.
Inaccuracy of the measurement method is less than 10 % of the reading.
W = Width
100, +50, .., 1600
H = Height
100, +50, .., 1000
MA = Material
ZT = Tailored product
MSA-400-200, MA=CS, ZT=N