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Rectangular airflow measurement unit
Rectangular airflow measurement unit

Halton MSA – Airflow measurement unit

This rectangular airflow measurement unit is available in various different sizes. Accurate measurement based on differential pressure by measurement probe pipes.

  • Classification of casing leakage EN 1751 class C.
  • Installation independent of airflow direction

Overview

  • Measurement based on differential pressure in measurement probe created by airflow
  • Very accurate measurement
  • Measurement probes can be removed for cleaning
  • Galvanized steel design
  • Classification of casing leakage EN 1751 class C.
  • Installation independent of airflow direction

Dimensions

 W  H
 100, 150, 200, 250 …1600  100, 150, 200, 250 …1000

Material

 Part  Material
 Casing  Galvanised steel
 Measurement probe pipes  Aluminium
 Measurement tubes  PVC and PP plastic

Function

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.

Installation

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)

Measurement

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

    Unit width (mm)
H      Unit height (mm)

Specification

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.

Order Code

MSA-W-H, MA-ZT

W = Width
100, +50, .., 1600

H = Height
100, +50, .., 1000

Other options and Accessories

MA = Material
CS       Steel

ZT = Tailored product 
N          No
Y          Yes

Code example

MSA-400-200, MA=CS, ZT=N

Downloads

Halton MSA – Airflow measurement unit
Data
en
MSA Ilmavirran mittausyksikkö suorakaide kanaviin
Data
fi
MSA Section de mesure rectangulaire
Data
fr
MSA Rektangulärt mätdon
Data
se
Halton MSA - fr
Datasheet
fr_FR
325.80 KB
  • Max. file size: 16 MB.

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