Understanding Conveyor Belt Scales

All information and photos courtesy of our friends at Weigh Shark.

Understanding The Belt Scale System

An Overview Of:

  • Components of a scale
  • Types of scales
  • Calibration and installation of scales

Components Of A Scale

3 Main Components

1. Control Box

control box

2a. Speed Sensor

speed sensor

2b. Shaft Encoder

shaft encoder

3. Weighbridge

troughing idler scale

Types of Weighbridges

Channel Insert Scale

channel insert scale

 

Wing Idler Scale

wing idler scale

 

 

 

 

 

 

Troughing Idler Scale

troughing idler scale

 

 

 

 

 

 

HD Troughing Idler Scale

hd troughing idler scale

 

 

 

 

 

 

Installation Of A Scale

  1. Select an Existing Idler location & Remove Idler
  2. Mount Weighbridges to Conveyor Frame
  3. Mount Idler on Scale Weighbridges
  4. String Line Idlers before and after & Shim if required
  5. Bolt Speed Sensor to a Different Idler or Mount Magnetic Encoder on Head Pulley or Tail Pulley
  6. Mount Integrator on Conveyor Frame near scale
  7. Run Wires From Load Cells & Speed Sensor to Integrator
  8. Provide Power Source (110/220VAC or 12/24 VDC)

Calibration of Scale

Using the graphical display provided with most belt scales

Step 1: ZERO TEST

  • One Revolution with Belt Running Empty

Step 2: SPAN TEST

  1. Enter in Idler span distance
  2. Enter in Calibration Weight Value for the Weights you will be installing
  3. Install weights and Perform SPAN TEST

Basic Scale Information Required to Size a Scale for a Conveyor

  • Type of Idler: CEMA, Wing, or Channel Insert
  • Maximum and Minimum Tons Per Hour (TPH) Expected
  • Belt Speed in Feet Per Minute (FPM)
  • Belt Width & Length of Conveyor
  • Idler Center Distance