Calibration and Services – Refractometer Calibration

Users of refractometers for the testing of Diesel Exhaust Fluids require some specific calibration materials. Manufacturers need an extremely high accuracy CRM to comply with ISO22241-2, whilst users in the field need longevity of product.

Bellingham + Stanley offer two product types based on existing fluids that have an equivalent refractive index to 32.5% Urea.

Manufactured in accordance EN ISO/IEC 17025:2005, these CRM’s are supplied with a UKAS Certificate showing traceability to NIST and ICUMSA at 20°C and 589nm.

Due to its relatively short shelf life and limited application, ss-aus may only be purchased on a Supply Contract basis, where a single purchase order commits to the supply on a bi-weekly, monthly or quarterly basis over a 12-month period. 

Order Code Type Value (RI) Vessel Volume Uncertainty (RI: k=2) Shelf Life 18-50 SS-AUS 1.38290 Plastic 15ml ±0.000011 6-weeks 90-421 BS-AUS 1.38290 Glass 1 x 5ml ±0.000034 12-months 90-521 BS-AUS 1.38290 Glass 5 x 5ml ±0.000034 12-months

Uncertainties:
The reported expanded uncertainty of measurement is stated as the standard uncertainty of measurement in units of °Brix (equivalent to weight % sucrose in water) multiplied by the coverage factor k=2, which for a normal distribution corresponds to a coverage probability of approximately 95%. The standard uncertainty of measurement has been determined in accordance with publication EA-4/02.