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 AFMS  A to Z Products
 Introduction
 
The AFMS is an accurate airflow measuring station and is furnished with a properly sized pressure transducer that outputs a signal proportional to CFM. It is designed to maintain a constant parallel airflow pattern over the static sensing ports for more accurate, steady signals under all duct conditions.

The AFMS is constructed so that strategically located sensing ports (based on duct size) continually sample the total and static pressures, when inserted normal to flow. The total pressures sensed by the upstream ports are continually averaged within the element in an isolated chamber. The static sensing ports (located where the influence of the velocity head is zero) are averaged in a second isolation chamber. Multiple elements are manifolded together for connection to a differential measurement device (gauge, transmitter, etc.) for flow measurement and indication purposes.
The COSMOS make Airflow Measurement Station consists of single or multiple airflow elements, factory mounted and pre‐piped in a casing designed for flanged connection to the ductwork. Standard materials consist of a galvanized casing and aluminum flow sensors and galvanized airflow straightner suitable for most HVAC applications.

The airflow measuring station utilizes multiple averaging sensors for total (velocity) pressure and static pressure measurements. The sensors are distributed across the flow stream to conform to the industry standard rules for equal area averaging (the standard pitot traverse).

The COSMOS make AFMS airflow measurement station has been developed for use in duct systems having a highly turbulent condition at the point of measurement. The airflow averaging element generates a differential (velocity) pressure signal similar to the orifice, venture.
 
  BASIC OPERATION
 
The airflow measuring station produces output signals referred to as total (high) and static (low) pressure. These two pressures are piped to the signal processor where the static pressure is subtracted from the total and the result indicated as velocity pressure. This measured differential pressure is equal to the average velocity of the air stream moving through the plane that the airflow measuring station is located in. This signal can be converted to air velocity and flow using the following equations:

V = 1096.7 ( √Pv / ρ ) Q = V X A
 
       Where:
 
       ρ = Actual density of air, in lb/ft3 (0.075 lb/ft3 at sea level and 68°F)
       Pv = Velocity pressure, in inches H2O
       V = Velocity, in FPM
       Q = Flow, in CFM
       A = Area, in ft2
 
This signal is scaled and linearized before being displayed and transmitted out as a 4‐20ma, 0‐10vdc signal.
 
 
  Features
 
Standard construction includes a galvanizes casing, aluminum flow sensor and galvanized airflow straightner.
Factory mounted and pre piped in a flanged duct section (casing).
Multiple total and static pressure sensing ports along the length of the element.
Low signal to noise ratio.
 
 
 Features
 
19" rack mountable or table top version Front and rear screw less
Single depth extrusions with decorative grooves Optimised usable height for 1u and 2u subracks
Softline with minmum screws    
 
 Construction
 
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
 
 Compliance
 
IEC 297 and DIN41494
IEEE 1101.10 / 11
IEC 297 and DIN41494
IEEE 1101.10 / 11
 Products
 
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
Card racks with GFN guides for PCBS - EURO / VME / CPCI
Legs - plastic
Aluminium special alloy extrusions and sheets
Screw type construction
Aluminium or CRCA base plate for components
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