Comparision of different measuring techniques for density and refractometry - METTLER TOLEDO
Know How

Comparision of different measuring techniques for density and refractometry

Know How

What are the advantages and disadvantages of the different measuring techniques for density and refractometry?

What are the major applications?

Please find the answers below:

Advantages:

  • Simple method
  • Quick measurement (*)
  • Inexpensive instrument
  • Special instruments with direct readings in Alcohol%, Sugar% (BRIX) or other density related values available

 

(*) if no thermostating required

Disadvantages:

  • Breakable glassware
  • Long and difficult thermostating
  • Very small measuring range (requires several hydrometers to cover a wider range, typically 20 units)
  • Operator dependent readings, therefore limited accuracy
  • No measurement protocol (not suitable for GLP)
  • Large sample volume required
  • Difficult to clean and dry

Main applications:

  • Quick control of a "rough" density value, mainly for process control
  • Suitable for the measurement of the same kind of sample (wine, beer) due to the limited measuring range
  • Not suitable for expensive samples (large volume required).

Advantages:

  • Simple method
  • Relatively inexpensive instrument
  • Inexpensive instrument
  • Special instruments with direct readings in Alcohol%, Sugar% (BRIX) or other density related values available

 

(*) if no thermostating required

Disadvantages:

  • Breakable glassware
  • Long and difficult thermostating
  • Density must be calculated (some balances include this calculation)
  • Operator dependent readings, therefore limited accuracy
  • No measurement protocol (not suitable for GLP)
  • Large sample volume required

Main applications:

  • Educational: what is density, how to measure density
  • Production control: where more precision is required
  • Analytical labs: where GLP is not required
  • Not suitable for expensive samples (large volume required).

Advantages:

  • No manual reading
  • GLP printout
  • Just an accessory to a balance, therefore relatively inexpensive

Disadvantages:

  • Long and difficult thermostating
  • Large sample volume required

Main applications:

  • Density of solids
  • Density of porous materials
  • Density of viscous material (using a gamma sphere)

Advantages:

  • Build-in user management with optional finger print reader
  • Build-in product management with automatic quality control
  • Build-in SOP
  • Automation (sample changer, computer)
  • Extension with other instruments for multiparameter measurement

Disadvantages:

  • Expensive

Main applications:

  • Quality control of final products

Advantages:

  • Simple method
  • Inexpensive instrument
  • Special instruments with direct readings in BRIX° or salinity

Disadvantages:

  • Small measuring range(requires several refractometers to cover a wide range)
  • No thermostating
  • Operator dependent readings, therefore limited accuracy
  • No measurement protocol

Main applications:

  • Quick control of a "rough" density value, especially for BRIX measurements
  • Sugar control in wine production

Advantages:

  • Relatively inexpensive instrument

Disadvantages:

  • Long and difficult thermostating (requires external water bath)
  • Operator dependent readings, therefore limited accuracy
  • No measurement protocol (not suitable for GLP/GMP)
  • Tedious calibration

Main applications:

  • Production control
  • Raw material control

Advantages:

  • Build-in user management with optional finger print reader
  • Build-in product management with automatic quality control
  • Build-in SOP
  • Extension with other instruments for multiparameter measurement

Disadvantages:

  • Expensive

Main applications:

  • Quality control of final products

Advantages:

  • Simultaneous measurement of all parameters saves time and prevents changes in the sample
  • All results are displayed on the touch panel and can be transferred to a PC, LIMS or ERP
  • Can be used with a sample changer and barcode reader for further automation

Disadvantages:

  • Expensive

Main applications:

  • Flavors and Fragrances
 
 
 
 
 
 
 
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