{"id":363569,"date":"2024-10-20T01:46:20","date_gmt":"2024-10-20T01:46:20","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-34552021\/"},"modified":"2024-10-26T02:46:38","modified_gmt":"2024-10-26T02:46:38","slug":"bs-iso-34552021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-34552021\/","title":{"rendered":"BS ISO 3455:2021"},"content":{"rendered":"<p>This document specifies a calibration method for mechanical type, electromagnetic type and acoustic type hydrometric current-meters used for point velocity measurement of flowing water. The method requires towing the instrument through still water in a straight open tank. It includes measuring apparatus, the calibration procedure, the method of presenting the results and the uncertainties associated with the method.<\/p>\n<h4>PDF Catalog<\/h4>\n<table border=\"1px\" class=\"des-table\">\n<tr>\n<th>PDF Pages<\/th>\n<th>PDF Title<\/th>\n<\/tr>\n<tr>\n<td><b>2<b><\/td>\n<td>National foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>6<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>1 Scope <br \/> 2 Normative references <br \/> 3 Terms and definitions <br \/> 4 Principle of calibration <br \/> 4.1 Statement of the principle  <\/td>\n<\/tr>\n<tr>\n<td><b>8<b><\/td>\n<td>4.2 Accuracy of the method <br \/> 4.2.1 Overall uncertainty on the velocity measurement <br \/> 4.2.2 Requirements for accurate measurements <br \/> 5 Infrastructure <br \/> 5.1 Dimensions of the towing tank <br \/> 5.1.1 General <br \/> 5.1.2 Length <br \/> 5.1.3 Depth and width  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>5.2 Towing cart <br \/> 5.2.1 General <br \/> 5.2.2 Cart track system <br \/> 5.2.3 Types of towing carts <br \/> 5.2.4 Cart operation  <\/td>\n<\/tr>\n<tr>\n<td><b>10<b><\/td>\n<td>5.2.5 Cart control <br \/> 5.3 Measuring equipment <br \/> 5.3.1 General <br \/> 5.3.2 Distance measurement <br \/> 5.3.3 Time measurement <br \/> 5.3.4 Current-meter velocity measurement  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>5.3.5 Sources of error related to infrastructure  <\/td>\n<\/tr>\n<tr>\n<td><b>12<b><\/td>\n<td>5.4 Data acquisition <br \/> 5.5 Data processing <br \/> 5.6 Other requirements <br \/> 6 Calculation of uncertainty  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>7 Calibration procedure <br \/> 7.1 Calibration of rotating element current-meters <br \/> 7.1.1 Suspension of the current-meter <br \/> 7.1.2 Performance of calibration  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>7.1.3 Data analysis  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>7.1.4 Presentation of results  <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>7.2 Calibration of electromagnetic current-meters <br \/> 7.2.1 Instructions for calibration <br \/> 7.2.2 Mounting the electromagnetic current-meter <br \/> 7.2.3 Number of calibration points  <\/td>\n<\/tr>\n<tr>\n<td><b>17<b><\/td>\n<td>7.2.4 Performance of calibration <br \/> 7.2.5 Data analysis <br \/> 7.2.6 Presentation of results <br \/> 7.3 Calibration of acoustic current-meters for point velocity measurement <br \/> 7.3.1 Instructions for calibration  <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>7.3.2 Mounting the acoustic current-meter <br \/> 7.3.3 Performance of calibration <br \/> 7.3.4 Data analysis <br \/> 7.3.5 Presentation of results  <\/td>\n<\/tr>\n<tr>\n<td><b>19<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Hydrometry. Calibration of current-meters in straight open tanks<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2021<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":363579,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[265,2641],"product_tag":[],"class_list":{"0":"post-363569","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-120-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/363569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/363579"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=363569"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=363569"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=363569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}