Airflow Sensor
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The AWM40000 Series mass flow sensor family is based on proven microbridge technology and includes both amplified signal conditioned devices and unamplified sensor only devices.
When using the unamplified devices(AWM42150VH and AWM42300V), theheater control circuit in Figure 1 and thesensing bridge supply circuit in Figure 2are both required for operation per specification.These two circuits are NOT onboard the sensor and must be supplied inthe application. The differential amplifiercircuitry in Figure 3 may be useful in providingoutput gain and/or introducingvoltage offsets to the sensor output (Ref.Equation 1).The amplified devices (AWM43300V andAWM43600V) can be used to increaseoutput gain and introduce voltage offsets.The differential instrumentation amplifiercircuitry, heater control circuitry andsensing bridge supply circuitry are allprovided onboard the amplified sensors.
FEATURES* Manifold mount/o-ring sealed* Ceramic flow-tube (non-outgassing), 0-1000 sccm* Plastic flow tube, 0-6 SLPM* High common mode pressure (150 psi ceramic flow-tube only)* Operating temperature up to 125°C (unamplified only)* High stability at null and full-scale
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