How Does NSG’s Premium Calibration Kits Compare to Thermo Fisher Scientifics 333150 Spectrophotometer Calibration Kit?September 21, 2011
How Does NSG’s Premium Calibration Kits Compare to Thermo Fisher Scientific 333150 Spectrophotometer Calibration Kit?
|Manufacturer||NSG Precision Cells||Thermo Fisher|
|Part Number||Premium Calibration Kit NSGND1||333150-000 (14-385-335)|
|No. of Filters Required in Kit||4||10|
|Core technology||Solid-State Nano-Deposition||Liquid|
|Features offered:||NIST compliance:||NIST compliance:|
|Yes||Limited to: 200, 300 and 400 nm||N/A|
|ND Calibration in UV range||Yes||Yes||No|
|NIST compliance for the entire kit**||Yes||No|
*NIST Traceable means that NIST requires having a record of performance of a calibration standard at certain wavelengths of incident light and other parameters, where necessary, for which a calibration standard was developed and manufactured.
**NIST Compliance means that a calibration standard (or the entire calibration standards’ kit, where applicable) meets ALL the requirements of the corresponding NIST guidelines
Thermo Fishers Spectrophotometer Calibration Kit
- photometric accuracy at 10%T and 50%T
- wavelength accuracy at 515 nm
- stray-light at 200, 340, and 400 nm.
- As per NIST, the proper verification of wavelength accuracy of a spectrophotometer requires testing 14 wavelength points. Therefore the Thermo Fisher calibration standard is insufficient for appropriate spectrophotometer wavelength accuracy verification.
- As per NIST, the proper verification of photometric accuracy in VIS light spectrum requires testing at 3 ND points. Therefore the Thermo Fisher calibration standard is insufficient for appropriate spectrophotometers photometric accuracy verification.
- This kit does not allow testing stray light performance in VIS range at “fixed” wavelengths above 400 nm and dynamically through both UV and VIS ranges, which is the fundamental disadvantage of this kit. For example, it is not possible to be confident in any work with fluorescent spectrophotometry samples without being sure in stray light performance of a spectrophotometer.
- The price of the said kit (Thermo Fisher Scientifics part number 333150 www.fishersci.com) is about $922 which would seem very reasonable for a total of 10 Standards if these standards could allow complete verification of performance of a spectrophotometer, which is not the case as this kit has certain major disadvantages described herein.
Disadvantages of The Thermo Fisher Spectrophotometer Calibration Kit
- Does not meet NIST requirements for neutral density (ND) calibration standards in regards to variety of types of ND filters in both: VIS and UV spectrum needed for appropriate verification of performance of spectrophotometers
- Large amount of filters in this Thermo Fisher Scientific kit makes it difficult and time consuming to operate, to keep track of, and require additional substantial expenses for mandatory periodic recalibration of all these standards
- Unable to properly calibrate wavelength accuracy as per NIST guidelines
- Taking in consideration all the above, the Thermo Fisher Scientifics kit is not NIST Compatible
When compared to NSG Precision Cells Premium Calibration Kits NSGND1 and NSGND1-OP, the Thermo Fisher kit is highly inferior. Customers must be very careful when they purchase the Thermo Fisher kit because it is not NIST compatible, as described herein, and therefore the Thermo Fisher kit cannot be used for proper complete spectrophotometer calibration in accordance with NIST guidelines.
NSG Precision Cells Premium Spectrophotometer Calibration Kits NSGND1 and NSGND1-OP
NSG’s kits are 100% NIST traceable and NIST compatible meaning that all the calibration standards are not only NIST Traceable but also meet all the guidelines set forth by NIST.
NSG Precision Cells Premium Calibration Kit NSGND1
NSGND1 kit includes a total of 4 universal nano-deposition wide-range traceable standards and is able to test photometric accuracy and stray light performance of spectrophotometers in the UV and Visible ranges.
The NSGND1 costs about $1764. The upside of this is that this kit is a one-time purchase and if the calibration standards are taken care of properly, they will last forever.
NSG’s kit NSGND1-OP
NSGND1-OP includes all the calibration standards of the NSG’s kit NSGND1 mentioned above while also offering optional (based on customers’ needs) NIST traceable and NIST compatible wavelength accuracy standards. This kit is also a one-time purchase and if the calibration standards are taken care of properly, they will last forever.
While usual average lifetime of calibration standards of other manufacturers does not exceed 3 years (mostly, due to material aging), NSG’s kits never has to be replaced or recalibrated due to materials aging, so scientists and lab staff can save time, money, and headaches of having to work with the manufacturer to repair or recalibrate their filters for this reason.