<\/div>\n
Lux meters<\/h2>
Lux meters use a silicon photodiode fitted with a V(\u03bb) filter – a correction filter that approximates the response of the human eye under photopic conditions – to measure illuminance expressed in lux (1 lux = 1 lumen\/m\u00b2). The typical range is 0.1 to 200,000 lux, with a resolution of 0.1 lux at low values and an accuracy of \u00b13-5% of the reading on professional models. The probe is generally separate from the readout unit and connected by a cable, to make measurement easier at precise working positions. Datalogger models record how illuminance varies over time, for analyzing daylight levels in buildings (including the contribution of natural light). <\/p>
Lighting standards<\/h2>
The UNI EN 12464-1 standard (lighting of indoor work places) prescribes the minimum illuminance values for each type of activity: 100-300 lux for circulation areas and warehouses; 300-500 lux for general offices; 500-750 lux for precision work; 1000-2000 lux for very high precision work (watchmaking, microelectronics). UNI EN 12464-2 governs outdoor lighting. Illuminance checks are an integral part of workplace safety inspections (Italian Legislative Decree 81\/2008) and of the commissioning of new lighting installations. Measurements are taken once the lamps have stabilized (at least 30 minutes after switch-on), with the sensor positioned at the height of the working plane. <\/p>
UV meters<\/h2>
UV meters use photodiodes with optical filters specific to each UV band: UVA (315-400 nm, the “black light” band used for fluorescence); UVB (280-315 nm, the sunburn band); UVC (100-280 nm, the germicidal band used for sterilization). The sensors are calibrated in units of intensity (mW\/cm\u00b2 or W\/m\u00b2) or of cumulative dose (mJ\/cm\u00b2 or J\/m\u00b2) – the latter being essential for sterilization applications, where the germicidal dose requires specific exposure times. Professional models come with interchangeable probes for the different UV bands, metrologically calibrated. <\/p>
UV applications<\/h2>
UV applications are wide-ranging: UV-C sterilization in hospitals, clinics and operating theaters (with verification of the germicidal dose actually applied); surface sterilization in the food industry; drinking water treatment (with verification of the UV dose); UV curing of industrial coatings, inks and adhesives (with monitoring of UV-A lamp intensity); the printing industry (for UV-curing inks); monitoring of work environments with UV exposure (arc welding, industrial processes); Wood’s lamp inspections (fluorescence) for NDT penetrant testing, identification of traces at crime scenes and document verification.<\/p>
Reference standards<\/h2>
The reference standards are: UNI EN 12464-1 and 12464-2 (lighting of work places); UNI 11142 (lighting measurements); ISO 8995 (lighting of indoor work places, international); IEC 62471 (photobiological safety of lamps); ICNIRP (UV radiation exposure limits for occupational safety). Periodic calibration of lux meters and UV meters is carried out with standard calibration sources certified to ISO 17025; the typical interval is annual. <\/p>
Selection criteria<\/h2>
The choice of lux meter or UV meter depends on the application: for illuminance checks in work places \u2192 a lux meter compliant with UNI EN 12464; for industrial UV curing \u2192 a dedicated UVA meter; for sterilization \u2192 a UVC meter with dose measurement; for safety applications \u2192 instruments with configurable alarms. Range, accuracy, portability, data connectivity and ISO 17025 calibration are decisive criteria for the choice. <\/p>","protected":false},"excerpt":{"rendered":"
Instruments for measuring illuminance (lux) and UV\/UVA\/UVC irradiance.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19505,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-20621","page","type-page","status-publish","hentry"],"yoast_head":"\n
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