AWM5102VN

Airflow Sensors High Flow Mass Airflow/Amplified AWM5000 Series FEATURES 1 Linear voltage output 1 Venturi design 1 Remote mounting capability 1 Active laser trimming improves interchange ability 1 Separate gas calibration types: – Ar (argon) – N2 (nitrogen) or – CO2 (carbon dioxide) In-Line Flow Measurement AWM5000 Series Microbridge Mass Airflow Sensors feature a venturi type flow housing. They measure flow as high as 20 standard liters per minute (SLPM) while inducing a maximum pressure drop of 2.25N H2O. The microbridge chip is in direct contact with the flow stream, greatly reducing error possibilities due to orifice or bypass channel clogging. Figure 1 Rugged, Versatile Package The rugged plastic package has been designed to withstand common mode pressures up to 50 psi, and the small sensing element allows 100 gs of shock without compromising performance. The included ‘‘AMP’’ compatible connector provides reliable connection in demanding applications. Figure 2 Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada Airflow On-board Signal Conditioning Each AWM5000 sensor contains circuitry which performs amplification, linearization, temperature compensation, and gas calibration. Figure 1 (Heater Control Circuit) and Figure 2 (Sensor Bridge Circuit and Amplification Linearization Circuit) illustrate the on-board electrical circuitry for the AWM5000 Series. A 1 to 5 VDC linear output is possible for all listings regardless of flow range (5, 10, 15, or 20 SLPM) or calibration gas (nitrogen, carbon dioxide, nitrous oxide, or argon). All calibration is performed by active laser trimming. 79 Airflow Sensors Highflow Mass Airflow/Amplified AWM5000 Series SPECIFICATIONS (Performance Characteristics @ 10.0 ±0.01 VDC, 25°C) Flow Range (Note 3) AWM5101 AWM5102 AWM5103 AWM5104 0-5 SLPM 0-10 SLPM 0-15 SLPM 0-20 SLPM Suffix - Calibration gas VA - Argon (Ar) Min. VC - Carbon dioxide (CO2) Typ. VN - Nitrogen (N2) Max. Excitation VDC 8 10±0.01 15 Power consumption (mW) — — 100 Response time (msec) — — 60 Null output VDC 0.95 1 1.05 Null output shift −20° to 70°C — ±0.050 VDC ±.200 VDC Common Mode Pressure (psi) — — 50 Temperature range Weight −20° to +70°C, (−4° to 158°F) 60 grams (2.12 oz.) Shock ratings Output @ laser trim point Output voltage shift +20° to −25°C, +20° to 70°C 100 g peak, 6 msec half-sine (3 drops, each direction of 3 axes) 5 VDC @ Full Scale Flow Suffix VA or VN ±7.0% Reading, Suffix VC ±10.0% Reading Linearity error (2) ±3.0% Reading (max.) Repeatability & Hysteresis ±0.5% Reading (max.) Connector (Included) —Four pin receptacle Leak rate, max MICRO SWITCH (SS12143)/AMP (103956-3) 0.1 psi/min. at static condition, (Note 2) Notes: 1. Linearity specification applies from 2 to 100% full scale of gas flow range, and does not apply to null output at 0 SLPM. 2. The AWM5000 series product has a leakage spec of less than 0.1 psi per minute at 50 psi common mode pressure. If during installation, the end adapters are twisted with respect to the flowtube, this may compromise the seal between the o-ring and the flowtube and may cause a temporary leak. This leak might be as high as 1 psi or might remain in specification. It will self-reseal as the o-ring takes a new set. Approximately 85% of the leakage will dissipate in 24 hours. Within 48 hours, complete recovery will take place. 3. SLPM denotes standard liters per minute, which is a flow measurement referenced to standard conditions of 0°C/1 bar (sea level), 50% RH. NOTICE AWM5000— Chimney Effect AWM microbridge mass airflow sensors detect mass airflow caused by heat transfer. The thermally isolated microbridge structure consists of a heater resistor positioned between two temperature sensing resistors. The heater resistor maintains a constant temperature, 160°C above ambient, during sensor operation. Airflow moving past the chip transfers heat from the heater resistor. This airflow warms the downstream resistor and cools the upstream resistor. The temperature change and the resulting change in resistance of the temperature resistors is proportional to the mass airflow across the sensing element. When the sensor is mounted in a vertical position, under zero flow conditions, the sensor may produce an output that is the result of thermally induced convection current. This occurrence is measurable in the AWM5000 Series, particularly in the 5 SLPM versions. When designing the sensor into applications where null stability is critical, avoid mounting the sensor in a vertical position. 80 Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada Airflow Sensors High Flow Mass Airflow/Amplified AWM5000 Series OUTPUT CURVES (Performance Characteristics @ 10.0 ±0.01 VDC, 25°C) Airflow Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada 81 Airflow Sensors Highflow Mass Airflow/Amplified AWM5000 Series AWM5000 ORDER GUIDE Catalog Listing Flow Range AWM5101VA 5 SLPM, Argon calibration AWM5101VC 5 SLPM, CO2 calibration (2) AWM5101VN 5 SLPM, N2 calibration (1) AWM5102VA 10 SLPM, Argon calibration AWM5102VC 10 SLPM, CO2 calibration (2) AWM5102VN 10 SLPM, N2 calibration (1) AWM5103VA 15 SLPM, Argon calibration AWM5103VC 15 SLPM, CO2 calibration (2) AWM5103VN 15 SLPM, N2 calibration (1) AWM5104VA 20 SLPM, Argon calibration AWM5104VC 20 SLPM, CO2 calibration (2) AWM5104VN 20 SLPM, N2 calibration (1) CONNECTOR ORDER GUIDE Catalog Listing SS12143 Description Four pin Electrical connector Connectors use Amp 103956-3 Note: All listings have 1 - 5 VDC linear output with 10 VDC supply over given flow range for a specific calibration gas. 1. N2 calibration is identical to 02 and air calibration. 2. CO2 calibration is identical to N2O calibration. 3. For additional gas correction factors, see Application Note 3. OUTPUT CONNECTIONS Pin 1 + Supply voltage Pin 2 Ground Pin 3 No connection Pin 4 Output voltage Arrow on bottom of housing indicates direction of flow. MOUNTING DIMENSIONS (for reference only) 82 Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada