High Technology, Inc.
109 Production Road,
Walpole MA USA 02081
Document Number
OM-E-FC-360-30
Revision Level
Rev. 3
Prepared By
J.S. Bolio
Approved By
S. Titov
Effective date
8/15/2016
Operator’s Manual: HTI BioChem FC-360
Page 132 of 217
HIGH TECHNOLOGY, INC. PROPRIETARY AND CONFIDENTIAL
Stray Light
Stray light
is any electromagnetic radiation of a different wavelength from that selected wavelength
reached by the detector and which is registered by the instrument.
This test is based on the absorbance measurement of a Sodium Nitrite solution. The solutions of this
substance absorb all wavelength radiation lower than 390 nm, that is why they are called optically
opaque to UV light.
Required materials:
Sodium Nitrite Solution 50 g/l
Automatic pipette
Procedure:
1. Dispense manually 300 µl of the solution in cuvette 1 or in any cuvette, indicating it on the
screen (Figure 12-25)
2. Wait for 5 minutes to reach thermal stability of the solution in the cuvette
3. Select
Maintenance
Validations
Stray Light
Cuvette number
OK
Filter
OK
4. The instrument reads at the selected wavelength, informing the value in absorbance units AU.
5. Perform the reading in duplicates.
Figure 12-26
Figure 12-27
Acceptable stray light: Abs. Higher tan 3AU