Calibration and Services – Refractometer Calibration

Calibration Oils are one of the most commonly used materials for calibrating refractometers as they have good traceability, particularly to NIST. Having a high temperature co-efficient, calibration oils are used where strict temperature control is adopted, either by Peltier or external waterbath between 20 and 75 °C. Calibration Oils are batch manufactured and so values may differ slightly from published data. Oils are supplied in multipacks of 5 x 5ml bottles with a certificate of calibration, MSDS and pipettes and have an expiry date 12-months from date of dispatch.

For refractometers operating at high temperatures where water starts to evaporate, an oil may be used as a zero calibration medium. Typical applications include those in the confectionery, edible oil and mineral oil marketplaces.

Order Code Description Specification Multi-pack of 5 x 5ml Bottles   Refractive Index* °Brix** 90-525 Calibration Oil 1.46737 70.78 90-530 Calibration Oil 1.51822 90.17 Maximum Uncertainty: ±0.000074 RI    ±0.030 °Brix Traceable to NIST. Note: * Typical Refractive Index @ 589.3nm & 20.0°C. **Equivalent °Brix value @ 589.3nm & 20.0°C. All quoted values for calibration oils are subject to minor batch to batch variations.

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.

Calibration Fluids – Calibration Oils at temperatures other than 20°C. FAQ-GRP-049 (pdf)
Calibration Fluids – Use in glass free environment. FAQ-GRP-051 (pdf)