24PC datasheet(12/73 Pages) HONEYWELL

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AWM90000 Series

The AWM90000 Series microbridge mass airflow sensors are available in

two versions, mass flow and differential pressure. The AWM92100V has

a flow range of ±200 sccm with a pressure drop of only 0.49 mBar,

typically. The AWM92200V is a differential pressure version that has a

range of ±2 in H

2O.

The AWM90000 Series has a 1 ms response time, operates with a

supply voltage from 8.0 Vdc to 15.0 Vdc, while consuming only 50 mW

of power. The compact plastic package will withstand a maximum

overpressure of 25 psi without compromising performance.

Signal Conditioning:

Unamplified

Port Style:

Straight

FLOW RANGE (FULL SCALE)

PRESSURE RANGE

REFERENCE

±200 sccm

—

AWM92100V

—

±2.0 H

2O (5 mBar)

AWM92200V

MASS AIRFLOW

CAUTION

PRODUCT DAMAGE

AWM Series Microbridge Mass Airflow

Sensors are not designed to sense

liquid flow and will be damaged by

liquid flow through the sensor.

Failure to comply with these

instructions could result in product

NOTICE

LAMINAR FLOW

Due to the fast response time of the sensor, these

specifications were generated using laminar flow. Airflow

instability or “turbulence” present in the airstream will

result in an increase in measurement uncertainty.

The turbulent flow problem can be corrected by either

straightening the airflow using flow laminarizing or by

slowing the response of the sensor using a simple RC

time constant on the output of the sensor. This, of course,

slows down the sensor response time. The values needed

depend on the amount of turbulence present in the

application.

Several techniques for laminarizing the flow include

adding hex shaped honeycombs, foam, screen materials

or adding constrictors (frits) to the flow stream. There are

various commercial laminar flow elements that can be

purchased. Unfortunately the greater the efficiency of the

laminarizer, the greater the increase in pressure drop in

order to establish a given flow rate. Plastic honeycomb

material probably gives the most improvement for the

least pressure drop. In any test fixture, the avoidance of

sharp radii is an absolute requirement.

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