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Overview

AWM40000 Series airflow sensor, amplified, flow/pressure range: +1000 SCCM; port style: manifold.

The AWM40000 Series Airflow Sensors are based on proven microbridge technology and include both unamplified sensor-only devices and amplified signal conditioned devices.

The microbridge mass airflow sensor operates on the theory of heat transfer. Mass airflow is directed across the surface of the sensing elements. Output voltage varies in proportion to the mass air or other gas flow through the inlet and outlet ports of the package.

This sensor has a unique silicon chip based on advanced microstructure technology. It consists of a thin film, thermally-isolated bridge structure containing heater, and temperature sensing elements. The bridge structure provides a sensitive and fast response to the flow of air or other gas over the chip. Dual sensing elements positioned on both sides of a central heating element indicate flow direction as well as flow rate.

The specially-designed housing precisely directs and controls the airflow across the microstructure sensing element. Mechanical design of the package allows it to be easily mounted to printed circuit boards.

Laser-trimmed, thick film and thin film resistors provide consistent interchangeability from one device to the next. The microbridge mass airflow sensor uses temperature sensitive resistors deposited within a thin film of silicon nitride. They are suspended in the form of two bridges over an etched cavity in the silicon.

The chip is located in a precisely dimensioned airflow channel to provide a repeatable flow response. Highly effective, thermal isolation for the heater and sensing resistors is attained by etching the cavity space beneath the flow sensor bridges.

The small size and thermal isolation of the microbridge mass airflow sensor are responsible for the extremely fast response and high sensitivity to flows. Dual Wheatstone bridges control airflow measurement–one provides closed loop heater control, the other contains the dual sensing elements.

The heater circuit minimizes shift due to ambient temperature changes by providing an output proportional to mass flow. The circuit keeps the heater temperature at a constant differential (160°C) above ambient air temperature which is sensed by a heat-sunk resistor on the chip. The ratiometric voltage output of the device corresponds to the differential voltage across the Wheatstone bridge circuit.

The unamplified versions require both a heater control circuit and a sensing bridge supply circuit for operation per specification. These two circuits are not on board the sensor and must be supplied in the application. Differential amplifier circuitry may be useful in providing output gain and/or introducing voltage offsets to the sensor output. The amplified versions' onboard circuits may be used to increase output gain and introduce voltage offsets. (See product datasheet and installation instructions for further circuit information.)

AWM43300V Amplified Airflow Sensors - Honeywell


Technical Specifications

Series Name AWM40000
Signal Conditioning Amplified
Flow/Pressure Range +1000 SCCM
Output Voltage at Trim Point 5 Vdc ±0.15 Vdc at 1000 SCCM
Null Shift over Temperature ±0.025 Vdc max.
Output Shift over Temperature -5.0% Reading max. to +6.0% Reading max.
Repeatability ±0.50 % Reading max.
Null Offset 1 Vdc ±0.05 Vdc
Response Time 1 ms typ., 3 ms max.
Supply Voltage 8.000 Vdc min., 15.000 Vdc max.
Port Style Manifold
Common Mode Pressure 150 psi
Power Consumption 60 mW max.
Operating Temperature -25°C to 85°C [-13°F to 185°F]
Storage Temperature -40°C to 90°C [-40°F to 194°F]
Media Compatibility Dry gas only
Weight 17,5 g [0.62 oz]
Shock 100 g peak (5 drops, 6 axes)
Availability Global
Comment Nitrogen calibration gas
UNSPSC Code 41111931
UNSPSC Commodity 41111931 Flow Sensors

Technical Specifications

Series Name AWM40000
Signal Conditioning Amplified
Flow/Pressure Range +1000 SCCM
Output Voltage at Trim Point 5 Vdc ±0.15 Vdc at 1000 SCCM
Null Shift over Temperature ±0.025 Vdc max.
Output Shift over Temperature -5.0% Reading max. to +6.0% Reading max.
Repeatability ±0.50 % Reading max.
Null Offset 1 Vdc ±0.05 Vdc
Response Time 1 ms typ., 3 ms max.
Supply Voltage 8.000 Vdc min., 15.000 Vdc max.
Port Style Manifold
Common Mode Pressure 150 psi
Power Consumption 60 mW max.
Operating Temperature -25°C to 85°C [-13°F to 185°F]
Storage Temperature -40°C to 90°C [-40°F to 194°F]
Media Compatibility Dry gas only
Weight 17,5 g [0.62 oz]
Shock 100 g peak (5 drops, 6 axes)
Availability Global
Comment Nitrogen calibration gas
UNSPSC Code 41111931
UNSPSC Commodity 41111931 Flow Sensors

Documents

TITLE DOCUMENT TYPE LANGUAGE SIZE
AWM40000 Series Airflow Sensors, Unamplified and Amplified Datasheet English 502KB
AWM Series Airflow Sensors Introduction Catalog Information English 186KB
AWM40000 Series Microbridge Mass Gas-flow Sensors Installation Instructions English 192KB
AWM40000 Amplified highres photo Photo -- 699KB
AWM40000 Amplified lowres photo Photo -- 79KB
AWM40000 Series AWM43300V CAD Model.stp CAD Model -- 478KB
Airflow, Force, and Pressure Sensors Range Guide Product Range Guide English 2MB
Sensors and Switches for Medical Applications Brochure English 11MB
Sensors and Switches: Solutions for Medical Applications Flyer English 2MB
Solutions for Ventilators Application Note English 3MB
Gas Media Compatibility & Correction Factors Technical Information English 96KB
Airflow Sensor Glossary of Terms Technical Information English 154KB
Mass Airflow Sensors Measuring Low Differential Pressures Altitude and Gas Density Correction Technical Information English 85KB
Mass Flow Sensors: Mass Flow versus Volumetric Flow and Flow Rate Unit Conversions Technical Information English 190KB
Mass Airflow Sensors Particle Contamination and Filter Manufacturers Technical Information English 99KB
Pressure or Airflow Sensors? Technical Information English 546KB
Energy and Environmental Design Trends Technical Information English 812KB

Product Features

  • Precision silicon micromachining
  • Sensitivity to low flows (0.1 SCCM to 6 SLPM)
  • Adaptable for use with higher flows
  • Low power consumption allows for use in portable devices and battery-powered applications
  • Analog output
  • Standard 2,54 mm [0.10 in] mounting centers
  • Laser-trimmed interchangeability
  • Accurate sensing of low pressure

Applications

  • Damper control for heating, ventilation, and air conditioning systems
  • Gas analyzers
  • Low vacuum control
  • Process control
  • Medical respirators and ventilators
  • Oxygen concentrators
  • Leak detection equipment
  • Vent hoods
  • Anesthesia control
  • Gas metering
  • Gas chromatography

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