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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Standex Electronics / Meder |
| Manufacturer Product Number | MFM7-37ADQO-5KP21 |
| Description | Gear Tooth Speed Sensor; Near zero speed; NPN, 5k pull-up |
| Datasheet | Download Datasheet |
The Standex Electronics MFM7-37ADQO-5KP21 is a Hall effect quadrature gear tooth speed and direction sensor for ferrous gear teeth, 4 to 32 pitch.
It has 2 digital outputs per tooth, 90° out of phase, so one sensor reads both shaft speed and direction of rotation. Near zero speed operation.
Output NPN, 5k pull-up; supply 4.1 to 25 V DC; supply current 3 to 15 mA (output off, Vcc 24 V); frequency range 0.1 Hz to 15 kHz; output low 0.6 V max (I sink 20 mA); internal pull-up 4.95 to 5.05 kΩ (Vcc to Vout); rise time 3.0 µs max; fall time 1.0 µs max.
Glass-filled nylon flange mount housing; connection: free-end PVC 22 AWG wires; max air gap .190 in (4 pitch gear) to .025 in (32 pitch gear), typical.
It operates from -40 to +110 °C (150 °C available, contact factory); ESD protection 2000 V; EMI immunity 20 V/m (20 kHz to 1 GHz).
| Category | |
| Manufacturer | Standex Electronics / Meder |
| Sensor Type | Quadrature gear tooth speed and direction sensor |
| Sensing Technology | Hall effect |
| Target | Ferrous gear teeth, 4 to 32 pitch |
| Speed Detection | Near zero speed |
| Outputs | 2 digital outputs per tooth, 90° out of phase (speed and direction) |
| Output Type | NPN, 5k pull-up |
| Supply Voltage | 4.1 to 25 V DC |
| Supply Current | 3 to 15 mA (output off, Vcc 24 V) |
| Frequency Range | 0.1 Hz to 15 kHz |
| Output Low Voltage | 0.6 V max (I sink 20 mA) |
| Internal Pull-Up / Pull-Down | Pull-up 4.95 to 5.05 kΩ (Vcc to Vout) |
| Output Rise Time | 3.0 µs max |
| Output Fall Time | 1.0 µs max |
| Duty Cycle | 40 to 60% |
| Max Air Gap | .190 in (4 pitch gear) to .025 in (32 pitch gear), typical |
| Housing Material | Glass-filled nylon |
| Mounting Type | Flange mount |
| Connection Type | Wire leads |
| Connection | Free-end PVC 22 AWG wires |
| Operating Temperature | -40 to +110 °C (150 °C available, contact factory) |
| ESD Protection | 2000 V |
| EMI Immunity | 20 V/m (20 kHz to 1 GHz) |