SLIA097 March   2022 DRV5011 , DRV5011 , DRV5012 , DRV5012 , DRV5013 , DRV5013 , DRV5015 , DRV5015 , DRV5021 , DRV5021 , DRV5023 , DRV5023 , DRV5032 , DRV5032 , DRV5033 , DRV5033 , TMAG5110 , TMAG5110 , TMAG5111 , TMAG5111 , TMAG5123 , TMAG5123 , TMAG5231 , TMAG5231 , TMAG5328 , TMAG5328

 

  1.   Trademarks
  2. 1Introduction
  3. 2Flow Meter Design
    1. 2.1 Mechanical Considerations
    2. 2.2 Magnetic Considerations
      1. 2.2.1 Material
      2. 2.2.2 Geometry
      3. 2.2.3 Magnetic Deign Tools
    3. 2.3 Hall-Effect Sensor Considerations
      1. 2.3.1 Device Sensitivity
      2. 2.3.2 Unipolar Switch
      3. 2.3.3 Omnipolar Switch
      4. 2.3.4 1D Latch
      5. 2.3.5 2D Integrated Latch
      6. 2.3.6 Bandwidth
      7. 2.3.7 Package
      8. 2.3.8 Power Consumption
  4. 3Flow Meter Development
    1. 3.1 3D-Print Recommendations
    2. 3.2 Flow Meter Assembly Considerations
    3. 3.3 Flow Meter Assembly Guide
      1. 3.3.1 Shaft Installation
      2. 3.3.2 Bearing Installation
      3. 3.3.3 Magnet Installation
      4. 3.3.4 Impeller Installation
      5. 3.3.5 O-ring Installation
      6. 3.3.6 Flow Meter Top Installation
      7. 3.3.7 PCB Mounting
      8. 3.3.8 Cover Installation
  5. 4Flow Meter Evaluation
    1. 4.1 Flow Meter Testing
  6. 5Error Sources
    1. 5.1 Mechanical Error
    2. 5.2 Sampling Error
    3. 5.3 Magnetic Error
  7. 6Flow Meter PCB
    1. 6.1 PCB Schematic
    2. 6.2 PCB Layout
  8. 7Bill of Materials (BOM)
  9. 8References

7 Bill of Materials (BOM)

Table 7-1 shows the BOM.

Table 7-1 Bill of Materials
Designator Quantity Value Description Package Part Number Manufacturer
PCB 1 Flow Meter PCB, 2 Layer board
C1 1 10 μF 10 μF Capacitor, 20%, 10 V, 0603

0603

 LMK107BC6106MA-T Taiyo Yuden
R1, R2

2

10 kΩ

 10-k Resistor, 5%, 0.1 W, 0603

0603

 RC0603JR-0710KL YAGEO
J1 1 Header, 2.54 mm, 4 × 1, Gold, TH 2.54 mm, 4 × 1 BHS-104-G-A Samtec
U1 1 DRV5013, SOT-23 SOT-23 DRV5013FAQDBZR Texas Instruments
O-Ring 1 Nitrile Rubber 1.5-mm width O-Ring 40-mm ID, 43-mm OD
Shaft

1

 4-mm dia. x 25-mm Stainless Steel Rod

Bearing

2

 Sealed Bearing: 4-mm ID, 10-mm OD, 4-mm Thickness MR104-2RS Bearings Direct

Ring Magnet

 1 8 Pole Radial Multipole Magnet, 8 mm Bore, 1/2in OD G8-H-315-50-8 Phoenix America

Disc Magnet

8

 1/4in dia. × 1/16in Thick N52 Axially Magnetized Disc Magnet D41-N52 K&J Magnetics

PTFE Tape

 1 PTFE Tape, ½ in width 21TF19 Grainger

Screw

4

 Coarse Screw, ¾ in length #6 32MT17 Grainger

Nylon Screw

2

 2-56 Nylon Screw, 1/8” length, Pan Head Philips 94735A705 McMaster-Carr

Flow Top

1

 Flow Meter Top, 3D-Printed, 2 Versions: Vertical and Horizontal

Flow Body

1

 Flow Meter Body, 3D-Printed ABS, 1 Version

Impeller

 1 Impeller, 3D-Printed, 3 Versions: Horizontal, Alternate, Ring Mag

Flow Cover

1

 Flow Cover, 3D-Printed, 2 Versions: Horizontal, Vertical