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

 

Advantages:
Disadvantages:Main applications:
Simple methodBreakable glasswareQuick control of a "rough" density value, mainly for process control

Quick measurement (*)Long and difficult thermostatingSuitable for the measurement of the same kind of sample (wine, beer) due to the limited measuring range
Inexpensive instrumentVery small measuring range (requires several hydrometers to cover a wider range, typically 20 units)

Not suitable for expensive samples (large volume required).
Special instruments with direct readings in Alcohol%, Sugar% (BRIX) or other density related values available

Operator dependent readings, therefore limited accuracy 
(*) if no thermostating requiredNo measurement protocol (not suitable for GLP)

 
 Large sample volume required

 
 Difficult to clean and dry 
Advantages:
Disadvantages:Main applications:
Simple methodBreakable glasswareEducational: what is density, how to measure density

Relatively inexpensive instrumentLong and difficult thermostatingProduction control: where more precision is required
Inexpensive instrumentDensity must be calculated (some balances include this calculation)

Analytical labs: where GLP is not required
Special instruments with direct readings in Alcohol%, Sugar% (BRIX) or other density related values available

Operator dependent readings, therefore limited accuracyNot suitable for expensive samples (large volume required).
(*) if no thermostating requiredNo measurement protocol (not suitable for GLP)

 
 Large sample volume required

 
Advantages:
Disadvantages:Main applications:
No manual readingLong and difficult thermostating

Density of solids
GLP printoutLarge sample volume required

Density of porous materials
Just an accessory to a balance, therefore relatively inexpensive Density of viscous material (using a gamma sphere)
Advantages:
Disadvantages:Main applications:
Build-in user management with optional finger print readerExpensiveQuality control of final products
Build-in product management with automatic quality control  
Build-in SOP  
Automation (sample changer, computer)  
Extension with other instruments for multiparameter measurement  
Advantages:
Disadvantages:Main applications:
Simple methodSmall measuring range(requires several refractometers to cover a wide range)

Quick control of a "rough" density value, especially for BRIX measurements
 No thermostating

 
Inexpensive instrumentOperator dependent readings, therefore limited accuracy

Sugar control in wine production
Special instruments with direct readings in BRIX┬░ or salinity

No measurement protocol 
Advantages:
Disadvantages:Main applications:
Relatively inexpensive instrumentLong and difficult thermostating (requires external water bath)

Production control
 Operator dependent readings, therefore limited accuracy

Raw material control
 No measurement protocol (not suitable for GLP/GMP)

 
 Tedious calibration 
Advantages:
Disadvantages:Main applications:
Build-in user management with optional finger print readerExpensiveQuality control of final products

Build-in product management with automatic quality control 

Build-in SOP
  
Extension with other instruments for multiparameter measurement
  

Multiparameter

Advantages:
Disadvantages:Main applications:
Simultaneous measurement of all parameters saves time and prevents changes in the sampleExpensiveFlavors and Fragrances
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