Smith Systems, Inc. - SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors
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SEPTEMBER 2005 Version
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SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors

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Our Bi- Directional Sensor provides dual phase related frequency and direction output logic for applications that require speed as well as gear rotation direction information. The sensor's internal circuitry also inhibits potential false direction output information due to gear vibration or back-lash motion. Other unique features and capabilities includes superior air gap, extensive operating temperature range, broad input voltage variation capability and high speed performance. As an added bonus, a small diameter enclosure is available in applications where mounting space is restricted.




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Maximum Speed

Operating Temperature

Output Impedance

Cable Assignment

Air Gap

280Z241 SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors 5/8-18 UNF 2A Inch 20 KHz -40 to 175 °F CMOS output, fan-out up to 2 74L or 1 74LS device ohm Red - Supply (+), Black - Common, Orange - Output A, Green - Output B, White - Direction output logic, Shield - Bare 0 to .040 typical with 20 pitch gear
0 to .150 typical with 8 pitch gear
280Z242 SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors 5/8-18 UNF 2A Inch 20 KHz -40 to 175 °F CMOS output, fan-out up to 2 74L or 1 74LS device ohm Red - Supply (+), Black - Common, Orange - Output A, Green - Output B, White - Direction output logic, Shield - Bare 0 to .040 typical with 20 pitch gear
0 to .150 typical with 8 pitch gear
280Z261 SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors 3/4-20 UNF-2A Inch 20 KHz -40 to 175 °F CMOS output, fan-out up to 2 74L or 1 74LS device ohm Red - Supply (+), Black - Common, Orange - Output A, Green - Output B, White - Direction output logic, Shield - Bare 0 to .040 typical with 20 pitch gear
0 to .150 typical with 8 pitch gear
280Z420 SMITH DIGI-TRAN® Bi-Directional Zero Speed Sensors 5/8-18 UNF 2A Inch 15 KHz -40 to +180 °F CMOS output ohm Red - +8 to 26 VDC, Black - Common, Blue - Output No. 1 (Pulse Train), Green - Output No.2 (Pulse train), White - Direction output logic, Bare - Shield (Floating) 0 to .030 typical with 20 pitch gear
0 to .100 typical with 8 pitch gear
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