AWM3000

Airflow Sensors Microbridge Mass Airflow/Amplified Figure 1 Heater control circuit FEATURES ɀ Laser trimmed for improved sensor interchangeability ɀ Flow sensing up to 1.0 SLPM ɀ Low differential pressure sensing Like the AWM2000 Series, the dual Wheatstone bridges control airflow measurement. The AWM3000 Series is amplified; therefore, it can be used to increase the gain and to introduce voltage offsets to the sensor output. The schematic in Figure 3 depicts the amplification circuitry on board the sensor. Also, the heater control circuit (see Figure 1) and the sensing bridge supply circuit (see Figure 2) are on board the package. Figure 2 Sensing bridge supply circuit AWM3000 Series Figure 3 Differential instrumentation amplifier circuit Airflow Honeywell ɀ Sensing and Control ɀ 1-800-537-6945 USA ɀ ⍣1-815-235-6847 International ɀ 1-800-737-3360 Canada 71 Airflow Sensors Microbridge Mass Airflow/Amplified AWM3000 Series AWM3000 SERIES ORDER GUIDE (Performance Characteristics @ 10.01 ±0.01 VDC, 25°C) Catalog Listings AWM3100V AWM3150V AWM3200V AWM3300V Flow Range (Full Scale) +200 sccm +30 sccm +1000 sccm Pressure Range (See Application Note 1) Output Voltage @ Trim Point Null Voltage 5 VDC @ 200 sccm 1.00 ±0.05 VDC 3.4 VDC @ 25 sccm 1.00 ±0.10 VDC +2.0⍯ H2O (5 mBar) 5 VDC @ 2⍯ H2O 1.00 ±0.08 VDC 5 VDC @ 1000 sccm 1.00 ±0.10 VDC Null Voltage Shift, Typ. +25° to −25°C, 25° to +85°C ±25 mV ±100 mV ±25 mV ±25 mV Output Voltage Shift, Max. +25° to ...