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Hellma calibration standard set UV857V4 for checking the photometer according to USP 857
Verification of the wavelength accuracy with UV5 holmium oxide liquid filter, calibrated at wavelengths 241, 250, 278, 287, 333, 345, 361, 385, 416, 452, 468, 485, 536, 640 nm, slit width 1 nm, measured against air.
Checking the photometric accuracy in the Vis range with the neutral density glass filters F2 (0.25 Abs), F203 (2.0 Abs), calibrated at wavelengths 440, 465, 546.1, 590, 635 nm, slit width 1 nm, measured against air.
Checking the photometric accuracy and linearity in the UV range with UV20 potassium dichromate 20 mg/l, UV0140 potassium dichromate 140 mg/l, calibrated at wavelengths 235, 257, 313, 350 nm, slit width 2 nm, measured against UV14 perchloric acid (blank).
Checking stray light with UV19 acetone, calibrated at 300 nm with slit width 1 nm, cut-off approx. at 385 nm, measured against air.
Checking the spectral resolution with UV6 toluene in hexane and UV9 hexane reference filter (blank), calibrated at wavelengths 265 - 270 nm, slit widths 0.5, 1.0, 1.5, 2.0, 3.0 nm.
All filters with serial number, packed in high-quality storage box with DAkkS calibration certificates, for UV6/UV9 Hellma Analytics calibration certificate. Note: Hellma Analytics calibration certificate (factory calibration, not covered by accreditation!)
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