Some basic principles:

Unlike gravimetric feeders where control is based on mass measurement, volumetric feeding is achieved without any instrument control. Feeding control is based on time setting (in batch mode the feeder is operated during afixed periode of time), and performance depends on feeders technology and settings.

Volumetric feeders are more economical than gravimetric feeders and allow shorter cycle times, however, it's not possible to check dosing values and to get feeding traceability.

Feeding stability:

Feeding stability depends on feeder extraction efficiency (extraction technology) and material properties. A powder with good flowability (low bonding strenght between particles), will give good results.  Feeders based on MCPI Fine dosing® principle, create inside the material shear forces charasterised by low amplitude but high density, able to separate particles bonded together and to break agglomerates. It results in a stable flow, giving a repeatable volumetric feeding.

 Hygienic

   : Option

Spherical shape powder (80 µm) 

Set point: 45 mg - Dosing time : 1.8"

Standard deviation: 1.1 mg

Small ball (Ø 0.5 mm) 

Set point: 1.0 g - Dosing time : 0.18"

Standard deviation: 0.044 mg

Milk powder -

Set point: 15 g - Dosing time : 0.8"   

Standard deviation: 0.16 g

Cement powder (40 µm)

Set point: 115 mg -Dosing time : 1.1"

- Standard deviation: 8.0 mg

Cosmetic powder (70 µm)

Standard deviation: 0.01 g

Set point: 0.2 g - Dosing time: 0.8"   

Cosmetic powder 80 µm

Set point : 1.55g - Dosing time : 0.8"

 Standard deviation: 0.036 g

Pharma powder (100µm) 

Set point: 0.04g - Dosing time : 0.6"

Standard deviation: 0.05 g

Pieces of hot red pepper

Set Point: 0.65g - dosing time : 0.7"

  - Standard deviation: 0.05 g