The AFM3000 is a digital mass flow meter from Aosong Electronics, specifically designed for ventilator applications. It accurately measures the flow of air, oxygen, and other non-corrosive gases. Featuring a specialized duct design for very low pressure loss, the AFM3000 is suitable for demanding applications such as medical ventilation and respiratory care. It operates on a 5V power supply and features a digital I2C interface, with internally calibrated and temperature-compensated output measurements. The sensor's performance is based on Aosong's sensor technology, integrating a thermal sensing chip with a high-performance 24-bit AD acquisition CMOS microprocessor for fast signal processing, high accuracy, and bidirectional measurement capabilities.
| Parameter | Conditions | Value | Unit | Notes |
| Sensor Performance (Table 1) |
| Flow Range (Air/N2/O2) | | -200 to +200 | slm | AFM3000-200 model. Other models in Table 10. |
| Accuracy (Span) | Typical | 1.5 | % of reading | Includes offset, nonlinearity, hysteresis. |
| Accuracy (Offset) | Typical | 0.05 | slm | Includes offset, nonlinearity, hysteresis. |
| Repeatability (Span) | Typical | 0.5 | % of reading | |
| Repeatability (Offset) | Typical | 0.02 | slm | |
| Noise Level (Span) | Typical | 0.5 | % of reading | |
| Noise Level (Offset) | Typical | 0.05 | slm | |
| Accuracy Offset Drift due to Temp Change (Span) | per 10 | 0.25 | % of reading/10 | |
| Accuracy Offset Drift due to Temp Change (Offset) | per 10 | 0.0 | slm/10 | |
| Position Sensitivity (Non-horizontal) | | <0.05 | slm | |
| Pressure Drop @ 60 slm | | <100 / <0.4 | Pa / inH2O | |
| Pressure Drop @ 200 slm | | <600 / <2.4 | Pa / inH2O | |
| Media Compatibility and Materials (Table 2) |
| Calibrated Media | | Air, N2, O2 | | |
| Media Compatibility | | Air (non-condensing), N2, O2, non-corrosive gases | | |
| Electrical Characteristics (Table 3) |
| Communication Mode | | I2C | | |
| Supply Voltage (VDD) | | 4.75 - 5.25 | V | |
| I2C Operating Level (High) | | 4 - VDD | V | |
| I2C Operating Level (Low) | | GND - 0.8 | V | |
| Sampling Period | | 10 | ms | |
| Power Consumption (Measuring) | | 7.5 - 10 | mA | |
| I2C Communication Speed | | 100 - 400 | Kb/s | |
| Operating Temperature | | 0 - +50 | | |
| Storage Temperature | | 0 - +50 | | |
| Operating Pressure Range (Absolute) | | 0.7 - 1.3 | bar | |
| Operating Overpressure (Measuring) | | +0.2 | bar | |
| Burst Overpressure (Measuring) | | >1 | bar | |
| Flow Coefficient (Air/N2) | | 140 | 1/slm | |
| Flow Coefficient (O2) | | 142.8 | 1/slm | |
| Offset | | 32000 | | |
| I2C Communication Parameters (Table 4) |
| I2C Clock Frequency (fSCL) | | 10 - 400 | KHz | |
| Start Condition Hold Time (tHDSTA) | | 0.8 | s | |
| SCL Clock High Period (tHIGH) | | 0.6 | s | |
| SCL Clock Low Period (tLOW) | | 0.6 | s | |
| Setup Time for Start Condition (tSUSTA) | | 0.1 | s | |
| Data Hold Time (tHDDAT) | | 0 - 0.5 | s | Relative to SCL edge |
| Data Setup Time (tSUDAT) | | 1 | s | Relative to SCL edge |
| Setup Time for Stop Condition (tSUSTO) | | 0.1 | s | |
| Bus Idle Time between Stop and Start (tBUS) | | 1 | s | |
| Pin Definitions (Table 9) |
| SDA | IN/OUT | I2C Digital Communication Data Pin | | |
| GND | / | Power Ground | | |
| VDD | +5V | Power Supply Pin | | |
| SCL | IN | I2C Digital Communication Clock Pin | | |
| Outer Dimensions (mm) (Figure 4) |
| Overall Dimensions | | See Figure 4 | mm | |
| Flow Meter Model List (Table 10) |
| Model | Flow Range | Unit | | |
| AFM3000-20 | 0-20 | slm | | |
| AFM3000-50 | 0-50 | slm | | |
| AFM3000-100 | 0-100 | slm | | |
| AFM3000-150 | 0-150 | slm | | |
| AFM3000-200 | 0-200 | slm | | |
Medical, Process Automation, Burner Control, Fuel Cell Control, Spectroscopy, Environmental Monitoring, Laboratories.
Aosong Electronics is dedicated to the research and development of various sensors, possessing professional R&D laboratories and equipment, supported by diverse simulation environment experimental conditions, to create high-quality product manufacturing and inspection processes. Flow sensor chips are among the chips independently developed and manufactured by our company. Flow ranges and independent duct structures can be customized according to application sites and customer needs, providing customers with complete application solutions.
