[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-227609-en":3,"doc-seo-227609-105":30,"detail-sidebar-cat-0-en-105":91},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},227609,1374391974564,"Clementine","https://ap-avatar.wpscdn.com/avatar/14000253aa45c000a9e?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779874745381141002",6,"Technology","HDI Hail Sensor - Overview, Specifications, Accessories","HDI hail sensor is a very low-power, fully sealed and mechanically robust acoustic instrument designed to detect hailstones with diameters from 0.5 cm to 7.5 cm. It measures impacts by detecting changes in internal acoustic pressure and provides continuous or pulse analog outputs. The sensor supports SDI-12, serial RS-232, and Modbus RTU over RS-485 with an optional adapter. Configurations can be customized via Plug-and-Play PC connection or remotely using serial commands, with selection of versions, accessories, and mounting kit items.","HDI  \nHail sensor  \nThe HDI is a very low-power, maintenance-free, totally sealed and mechanically ultra-robust acoustic instrument with no mobile parts. It is able to detect hailstones between 0 .5 and 7.5 cm diameter and will survive the most extreme hail episodes. The sensing part of the instrument is a three layer polished stainless disc supported by an unbreakable stainlesssteel arm. Impacts of hailstones (or any other lithometeors in the same range of kinetic energy) induce a measurable change in internal acoustic pressure.  \nIt features continuous or pulse analog voltage outputs and supports SDI-12 communication, serial RS-232, and Modbus RTURS485 (using an optional adapter) . The full configuration of the sensor can be customized at any time with a Plug-and-Play PC connection or remotely, using serial commands.  \nVersions  \n Art  Version   \n21437  Hail sensor with mounting kit and 3m signal cable   \nScope of delivery  \n\n| Ref. | Description | Quantity |\n| --- | --- | --- |\n| HDI | Hail detection sensor | 1 |\n| - | Mounting arm | 1 |\n\nAccessories  \n\n| \u003Cbr>Art\u003Cbr>21423 |  |\n| --- | --- |\n|  | Signal converter 0-10 VDC to 4-20 mA |\n| 21431 | RS-232-ModbusRTU adapter |\n| 21521 | Extension cable in custom length per meter, min.\u003Cbr>10 m |\n\n\n| \u003Cbr>Art\u003Cbr>\u003Cbr>21520 |  |\n| --- | --- |\n|  | Junction box for cable extension |\n| 21921 | USB Dongle for acoustic sensors |\n\nSpecifications  \nMeasurement characteristics  \n\n| Measuring surface | 200 mm outer diameter disc |\n| --- | --- |\n| Precipitation detected by the sensor | Solid only (hail) .\u003Cbr>15 classes, from 0 .5 cm (minimal detectable diameter) to ≥ 7 .5 cm (possible saturation of the instrument) .\u003Cbr>Counting of the number of hailstone impacts up to 25 impacts per second. |\n| Measurement accuracy | For a given controlled elastic momentum impact (such as spheres of equal diameter, density, Young modulus, falling speed and incidence angle) , the response of the sensor varies typically by ± 10%, depending on the spatial position of the impact on the disc and on the sensor (± 10% variability between two sensors) . |\n| Particle velocity | Not measured. |\n\nDatasheet HDI  \n[SOMMER GmbH | www.sommer.at | office@sommer.at |](SOMMER GmbH | www.sommer.at | office@sommer.at |)提沃克科技 | [www.china-twk.com | twk@china-twk.com](www.china-twk.com | twk@china-twk.com)  \n| Power supply | Ratings |\n| --- | --- |\n| Voltage | 6 V to 30 V DC (9.6 V and 16 V DC in case of powering through the SDI-12 terminals) |\n| Current | \u003C 1 mA in stand-by mode and 20 mA max in acquisition mode.\u003Cbr>For a typical nominal duty-cycle of 10%: 2.1 mA (20 mA for duty-cycle of 100%) . |\n\n\n| Interfaces | Description |\n| --- | --- |\n| Analog | Pulse and continuous (and persistent) voltages, 0-2.5V or 0-5V |\n| SDI-12 | Yes, V1.3 (distrometer output via extended SDI-12 commands) |\n| RS-232 TTL | Yes |\n| Modbus RTU (RS485) | Yes (Note: requires the Modbus adapter accessory) |\n\nDatasheet HDI  \n[SOMMER GmbH | www.sommer.at | office@sommer.at |](SOMMER GmbH | www.sommer.at | office@sommer.at |)提沃克科技 | [www.china-twk.com | twk@china-twk.com](www.china-twk.com | twk@china-twk.com)","cbCaimO01vL3ttGl","https://ap.wps.com/l/cbCaimO01vL3ttGl","pdf",244410,1,2,"English","en",105,"# HDI Hail Sensor\n## Key Features\n## Versions and Scope of Delivery\n## Accessories\n## Measurement Characteristics\n## Electrical and Interface Specifications","[{\"question\":\"What hail size range can the HDI hail sensor detect?\",\"answer\":\"It detects solid hailstones between 0.5 cm and 7.5 cm diameter. Sizes beyond this range may cause possible saturation at the upper limit.\"},{\"question\":\"How does the HDI sensor detect hail impacts?\",\"answer\":\"Hailstone impacts induce a measurable change in internal acoustic pressure within the instrument. The design uses a three-layer polished stainless disc supported by an unbreakable stainless-steel arm.\"},{\"question\":\"Which communication interfaces and outputs are supported?\",\"answer\":\"The sensor supports continuous or pulse analog voltage outputs and supports SDI-12, serial RS-232, and Modbus RTU (RS-485) using an optional adapter. SDI-12 is listed as V1.3.\"}]","HDI Hail Sensor - Overview, Specifications, Accessories | PDF",1789010844,5,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":86,"head_meta":88,"extra_data":90,"updated_unix":28},"hdi-hail-sensor-overview-specifications-accessories","",{"@graph":36,"@context":85},[37,53,68],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,47,50],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":21},"https://docshare.wps.com/document/","Document",{"item":48,"name":12,"@type":43,"position":49},"https://docshare.wps.com/document/technology/",3,{"item":51,"name":13,"@type":43,"position":52},"https://docshare.wps.com/document/hdi-hail-sensor-overview-specifications-accessories/227609/",4,{"url":51,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":62,"encodingFormat":60,"isAccessibleForFree":63,"interactionStatistic":64},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-11","2026-09-10",true,{"@type":65,"interactionType":66,"userInteractionCount":20},"InteractionCounter",{"@type":67},"ViewAction",{"@type":69,"mainEntity":70},"FAQPage",[71,77,81],{"name":72,"@type":73,"acceptedAnswer":74},"What hail size range can the HDI hail sensor detect?","Question",{"text":75,"@type":76},"It detects solid hailstones between 0.5 cm and 7.5 cm diameter. Sizes beyond this range may cause possible saturation at the upper limit.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"How does the HDI sensor detect hail impacts?",{"text":80,"@type":76},"Hailstone impacts induce a measurable change in internal acoustic pressure within the instrument. The design uses a three-layer polished stainless disc supported by an unbreakable stainless-steel arm.",{"name":82,"@type":73,"acceptedAnswer":83},"Which communication interfaces and outputs are supported?",{"text":84,"@type":76},"The sensor supports continuous or pulse analog voltage outputs and supports SDI-12, serial RS-232, and Modbus RTU (RS-485) using an optional adapter. 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