Description
| Description & Traceability | Metal on Quartz filter for absorbance/linearity in the NIR area of the spectrum. NIST/NRC (Canada)Traceable, complete with UKAS ISO/IEC 17025 accredited certificate of calibration. |
| Certified Wavelengths | 250.0, 360.0, 465.0, 546.1, 635.0, 1100, 1700, 2210, 2500, 2800 nm |
| Physical Configuration | Metal coated quartz filter with coated side protected by an optically contacted quartz window. The filters are mounted in protective aluminum holders that will fit a standard instrument cell holder. |
| ISO Accredited | ISO/IEC 17025, ISO Guide 34 by UKAS & ISO 9001 by BSI. |
Metal-on-Quartz NIR Filters:
| Part No. | %T Transmittance | Absorbance |
| 1NQ | 10% | 1.00 A |
| 3NQ | 30% | 0.52 A |
| 9NQ | 90% | 0.06 A |
Product Description:
A standard range of Metal on Quartz absorbance standards for the NIR area of the spectrum to facilitate full compliance with USP requirements.
All Starna Metal on Quartz Filters have an optically contacted quartz cover plate to protect the metalized surface and facilitate easy cleaning.
The filters allow absorbance and linearity at certified wavelengths across the range from 250 nm to 2800 nm and the relative values are shown on the table to the right. They can be certified at wavelengths other than those shown above, on request.
The filters are produced in our ISO 9001 accredited production facility under ISO Guide 34 as a reference material producer and calibrated in our ISO/IEC 17025 accredited calibration laboratory.
Suggestions for Use:
The NIR Metal on Quartz Filters are intended for use across a broad spectrum including the NIR with a relatively flat transmission profile across all wavelengths. Normally three representative absorption filters would be chosen for any given application but, the filters may be bought individually, in sets as shown below, or any combination from the standard range.
Compare the spectrophotometer absorbance values to the certified absorbance values. Taking the expanded uncertainty budget† of the certified references into consideration, if the absorbance values fall within the expected parameters† of the instrument then the instrument is working correctly.
It is important to confirm that Metal on Quartz filters are suitable for use with the instrument under test as they have a highly reflective surface and some instruments are sensitive to the positioning of such materials in the sample holder.
† Expected Parameters and Expanded Uncertainty Budget
The expanded uncertainty budget (k=2) is the tolerance that we could expect to measure in the assigned value on any one of our reference spectrophotometers during the 2 year period of certification.
When used to verify the performance of any given spectrophotometer this certificate tolerance must be added in a simple linear manner to the stated appropriate specification accuracy of the instrument on the test, see following example:
| Wavelength | Absorbance | |
| Certificate | ±0.10 nm | ±0.0049 A |
| Instrument | ±0.30 nm | ±0.0050 A |
| Total | ±0.40 nm | ±0.0099 A |
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