9 DEALER MANUAL FOR SR PA1XX.32.S

DEALER MANUAL FOR SENSOR

CONTENT

9.1 INTRODUCTION OF SENSOR

Name: BB speed sensor

Model: SR PA112.32.S, SR PA121.32.S, SR PA131.32.S, SR PA142.32.S, SR PA172.32.S

Image of the BAFANG SR PA1XX.32.S BB speed sensor, a compact, cylindrical component with visible gears and connectors.

Scope: It is applicable to standard 68mm BB. The material of locking cap is PA (nylon).

This is a speed sensor for the BB (bottom bracket). This high-quality and high-performance BB speed sensor is installed on electric bicycles or tricycles. The CPU processes the speed signals collected by the speed sensor by means of non-contact induction and analyzes the motor operating direction. As the speed sensor (including its PCBA) is integrated within the BB, it is protected from friction and boasts a longer service life.

9.2 SPECIFICATIONS

Model: SR PA 1XX.32.S

SpecificationValue
Rated current (mA)< 10
The thread standardBC1.37"*24
Outdoor Temperatures-20 °C~60 °C
Shaft Length (mm)127 / 119 / 124 / 136.5 / 132
Shaft standardJIS
BB width(mm)68
Rated voltage (V)4.5-5.5
Impulses per revolution32

9.2.1 Outline and geometric size

Technical diagram illustrating the BAFANG BB speed sensor's outline and geometric dimensions. It shows the sensor from the side, indicating the 'Chain wheel side' and 'Non-chain wheel side'. Key dimensions are labeled: 'X (Shaft Length)' with values for different models, and 'L±10'. Thread standards 'BC1.375*24LT' and 'BC1.375*24RT' are noted. A 'Labeling part' is also indicated. The overall BB width is specified as 68mm±0.5.
Model No.SR PA112.32.SSR PA121.32.SSR PA131.32.SSR PA142.32.SSR PA172.32.S
X (Shaft Length) /mm127119124136.5132

Connector Length(mm), Connector type: 150 G6.5.4 / 950 G6.5.4

9.2.2 Cautions

9.3 SENSOR INSTALLATION

9.3.1 List of Tools to be used

Use of the Tools: To fasten or remove lock cap on sensor

Tools: Special tools ⚙️ [tools icon]

9.3.2 Install Sensor

Assemble requirements:

  • The thread standard: BC1.37"*24
  • On Chain wheel side must be left hand thread.
  • On Non-chain wheel side must be right hand thread.
  • Bottom Bracket: 68mm±0.5
  1. Remove the nuts (A) and the left locking cap (B) of the sensor.

    Diagram illustrating the removal of nuts (A) and the left locking cap (B) from the BB speed sensor assembly.
  2. Check whether there are any iron chips, burrs or paint on the inner thread of the BB. If any, please check it up. Apply grease on the thread cap.

  3. Screw the left lock cap (B) clockwise from non-chain wheel side into the bottom bracket.

    Diagram showing the left lock cap (B) being screwed clockwise into the bottom bracket from the non-chain wheel side.
  4. Push cable (C) of sensor from chain wheel side through the hole in the bottom bracket. Make sure that the cable don't slide back into the bottom bracket.

    Diagram illustrating the sensor cable (C) being pushed through the hole in the bottom bracket from the chain wheel side.
  5. Place sensor into the BB of frame and screw the lock cap (from chain wheel side) anticlockwise into the BB.

    Diagram showing the sensor being placed into the BB of the frame and the lock cap (from the chain wheel side) being screwed anticlockwise into the BB.
  6. Screw the lock cap anticlockwise into the bottom bracket and fasten with special tools. Tightening torque requirement: 30 Nm(max).

    Diagram showing a lock cap being screwed anticlockwise into the bottom bracket and fastened with special tools. A torque wrench icon indicates a tightening torque requirement of 30 Nm(max).
  7. Fasten the lock cap on non chain wheel side clockwise with special tools. Tightening torque requirement: 30 Nm(max).

    Diagram showing a lock cap being fastened clockwise on the non-chain wheel side with special tools. A torque wrench icon indicates a tightening torque requirement of 30 Nm(max).
  8. Put onto the dust-proof plug (F) at both sides of the shaft.

    Diagram illustrating the placement of dust-proof plugs (F) on both sides of the shaft.
  9. Put the rubber ring (G) into the cable outlet hole.

    Diagram showing the rubber ring (G) being inserted into the cable outlet hole.

9.3.3 Remove Sensor

  1. Remove the rubber ring (G).

    Diagram showing the rubber ring (G) being removed.
  2. Screw Off the lock cap (H) with special tools (C).

    Diagram illustrating the lock cap (H) being unscrewed with special tools (C).
  3. Push back cable (D) from the hole and remove out the sensor from frame.

    Diagram showing the sensor cable (D) being pulled back from the hole, and the sensor being removed from the frame.
  4. Screw Off anticlockwise the lock cap (A) on non chain wheel side with special tools (C).

    Diagram showing the lock cap (A) on the non-chain wheel side being unscrewed anticlockwise with special tools (C).
  5. Finish the dismantlement.

    Diagram showing the disassembled components of the BB speed sensor after removal.
Models: SR PA Series Speed Sensor, SR PA Series, Speed Sensor, Sensor

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