BS ISO 15727:2020 pdf download

BS ISO 15727:2020 pdf download.UV-C devices — Measurement of the output of a UV-C lamp
1 Scope
This document specifies the measurement of the output of a UV-C lamp, types of UV-C lamp, lamp ballast, and safety issues. It is applicable to the output measurement of linear UV-C disinfection lamps. This document specifies a measurement method for evaluating output power of UV-C lamps installed in heating, ventilation and air conditioning (HVAC) systems. The method includes the simulation measurement of UV-C output power of UV-C lamps under various temperatures and various air velocities, and under conditions that the axial direction of the lamp is parallel or perpendicular to the air flow direction. It can reliably evaluate and compare the UV-C output power of UV-C lamps in the ultraviolet germicidal irradiation (UVGI) device based on the testing results. If the microbial inactivation rate of a particular UVGI device equipped with the same type of UV-C lamp is known, the microbial inactivation rate of the UVGI device at various temperatures and at various air velocities can be evaluated.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15858, UV-C Devices — Safety information — Permissible human exposure
ISO 29464:2017, Cleaning of air and other gases — Terminology
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
CIE S 017, International Lighting Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 29464, CIE S 017 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 ultraviolet radiation
UV radiation
wavelength of the electromagnetic spectrum of radiation from 10 nm to 400 nm
Note 1 to entry: The range between 100 nm and 400 nm is commonly subdivided into:
— UV-A: 315 nm to 400 nm;
— UV-B: 280 nm to 315 nm;
— UV-C (3.2): 200 nm to 280 nm;
4.2 Types of UV-C lamps
4.2.1 General
UV-C lamps are divided into medium pressure UV-C lamps and low pressure UV-C lamps; air disinfection devices usually use low pressure UV-C lamps. The low pressure UV-C lamps are made of liquid mercury or amalgam that controls mercury vapour pressure in the UV-C lamp to provide mercury atoms required for discharge. Mercury atoms produce 253,7 nm UV-C photons through electron bombardment. Figure 1 shows the spectrum of low pressure UV-C lamps.