MSS - Measurement unit

Static pressure measurement unit for circular ducts

Comprising measurement element and pressure transmitter with LCD display. The unit is designed to be used in combination with static pressure control damper HFS to maintain the desired constant duct pressure

  • Pressure transmitter equipped with automatic zero point calibration to ensure continuous accuracy
  • Circular duct static pressure measurement unit comprising measurement element and pressure transmitter with LCD display
  • The static pressure measurement unit MSS is designed to be used in combination with static pressure control damper HFS to maintain the desired constant duct pressure
  • Adjustable pressure measurement range 0…1000 Pa
  • Accurate measurement, inaccuracy less than ± 10 % in typical applications
  • Pressure transmitter equipped with automatic zero point calibration to ensure continuous accuracy
  • Available in sizes Ø200 … Ø 500
  • Classification of casing leakage EN 1751 class C
  • Duct spigots have integrated rubber gaskets

The casing of the measurement unit shall be made of galvanized steel.
The measurement unit shall have integral gaskets.
The flow measurement probe pipes shall be made of aluminium.
The unit shall have integrated pressure transmitter (0-10V signal) with display showing measured value.

Introduction

Halton MSS

Circular static pressure measurement unit
 


 

  • Static pressure measurement unit for circular ductwork
  • Comprised of a measurement element and a pressure transmitter with an LCD display
  • The static pressure measurement unit Halton MSS is designed to be used in combination with static pressure control damper Halton Vario MDC or Halton HFS to maintain the desired constant duct pressure
  • Adjustable pressure measurement range of 0 to 1000 Pa
  • Accurate measurement, with a margin of error less than ± 10 % in typical applications
  • The pressure transmitter is equipped with automatic zero point calibration to ensure continuous accuracy
  • Available in sizes Ø200 to Ø 500
  • Classification of casing leakage EN 1751 class C
  • Duct spigots have integrated rubber gaskets

Dimensions and weight

Dimensions and weight
 

Halton MSS
 


 

NS L ØD
200 142 199
250 142 249
315 142 314
400 195 399
500 195 499


Weight


NS kg
200 0,90
250 1,08
315 1,31
400 2,34
500 2,85

Material

Material



Halton MSS 

  Part   Material   Note
  Casing   Galvanised steel  
  Measurement tube   Silicone  
  Measurement tab   Polyurethane  
  Duct gaskets   1C-polyurethane hybrid  
  Transmitter Enclosure   Polycarbonate   IP54


Duct connection gaskets are vulcanised to the casing.
 

Function

Function


Halton MSS

Duct static pressure is accurately determined using multipoint averaging measurement. The duct static pressure is measured between the Halton MSS measurement tab and the reference space. The pressure of reference space represents the air pressure of the spaces in the ventilation system’s service area (see Installation section).

The Halton MSS unit includes static type pressure measurement sensor with a digital display of the actual pressure value. The measured value is transmitted using 0 to 10 volt signal.




Halton MSS pressure measurement parts:
A     Pressure measurement chamber
B     Pressure measurement tube connection points
C     Power supply and output signal.

Continuous accuracy is assured by automatic zero point calibration of pressure sensor. Thus, no manual re-calibration is needed in normal operating conditions.


 

Installation

Installation


Halton MSS

The static pressure measurement unit must be installed in a space where ambient temperature is between 0 and 45°C.
 

Ductwork installation, Safety distances

In order to ensure the accuracy of the duct static pressure, measurement the safety distances between the measurement unit and flow disturbances (e.g. bends, T-branches) must be respected. The necessary safety distances before and after different disturbances are presented in figures below.


 90° elbow


Branch on supply duct




Branch on exhaust duct



Safety distance between MDC/HFS control damper and MSS, straight duct

 

Measurement tube connections

Connect the pressure measurement tube from the unit to the sensor, either to +/- taps, according to the exhaust/supply application.  Supply connection is the default factory setting.

In typical installations the reference pressure inlet (+ for exhaust installation and - for supply installation) is left open at the ambient air. If necessary, the reference pressure can be connected to the reference pressure inlet by the contractor using Ø 6/4 mm measurement tubes. 


Connection of measurement tube to the transmitter in supply and exhaust installations.



Electric connections
1.   Power supply, 24 VAC / 24 VDC
2.   Neutral, 0 V
3.   Output signal, 0 to 10 VDC, < 2 mA

Power supply is wired from pressure control damper.
 

Technical data of the pressure transmitter

Supply voltage:          22…28 VAC/VDC
Power consumption:  < 1.5 VA  24 VAC, < 1.0 VA  24 VDC 

Measurement ranges:

  • 0…100    Pa 
  • 0…200    Pa   (factory default) 
  • 0…500    Pa
  • 0…1000  Pa 
  • 0…2500  Pa  (not to be used with Halton MDC or Halton HFS)
     

Operating temperature                       0 …+45ºC
Maximum overpressure                      25 kPa
Enclosure                                         IP 54, polycarbonate
Dimensions (width x height x depth)   115 x 115 x 45 mm
 

Measurement

Measurement


Halton MSS

The Halton MSS unit includes static type pressure measurement sensor with digital display.
Adjustable pressure measurement ranges corresponding to 0-10 VDC output signal are:

  • 0…100 Pa
  • 0…200 Pa (Factory default)
  • 0…500 Pa
  • 0…1000 Pa
  • 0...2500 Pa (Not used)
     

Pressure measurement range is set with jumpers according to the diagram below:
 

Delay selection
Pressure measurement output signal delay of 2 s is designed to be used in Halton MDC/HFS control damper and Halton MSS applications. 

Measurement tubes
+  Higher pressure
-  Lower pressure

Inaccuracy of the Halton MSS is a function of measured static pressure and air velocity in ventilation duct. In undisturbed flow conditions inaccuracy is less than ± 10% when:

  • Static pressure > 40 Pa and air velocity < 6 m/s
  • Static pressure > 100 Pa and air velocity < 10 m/s
     

Continuous accuracy is assured by automatic zero point calibration of pressure sensor. Thus, no manual re-calibration is needed in normal operating conditions.
 

        

Technical specification

Technical specification text

 

The casing of the measurement unit shall be made of galvanized steel.

The measurement unit shall have integral gaskets.

The unit shall have integrated pressure transmitter (0-10V signal) with display showing measured value.

 

Product Code

Product code

MSS-D

D  = Connection size
        200, 250, 315, 400, 500

ZT = Tailored product
        
N    No
 

Code example

      MSS-200, ZT=N


 

Downloads & Media

Halton MSS - fr
Type
Datasheet
Language
francés (Francia)
Size
2.5 MB
Halton MSS - se
Type
Datasheet
Language
sueco (Suecia)
Size
298.5 kB