Our flow meters are generally designed and constructed according to ISO 5167, which describes in detail the geometry, construction, requirements, and calculations of various types of flow meters.
It is an empirical method of finding the discharge coefficient1. The calibration institute sets up our meter in their pipeline, where they have a way of knowing the exact flow, usually by the way of one or more calibrated coriolis meters. The standard only has a few requirements regarding calibration. The main one is that the meter must be calibrated to the full range of operational Reynolds numbers2.
There are a few reasons to calibrate flowmeters.
All the calibration facilities used by EMCO Controls are certified. This, as a bare minimum, means they are accredited to ISO17025, which is the requirements for the competence of testing and calibration laboratories. This is certified by both DANAK and ILAC MRA. They often have numerous additional certifications as well. Browse our , with a variety of options to suit every taste and budget, available to buy online.
Generally, meters are calibrated on the phase medium as the operational use, even though this is not a requirement. This is usually for practical reasons; a meter meant for gas will usually require extremely high flow of water to reach the same Reynolds numbers. As most of the meters, EMCO products are meant for hydrocarbon gas applications, the logical solution is a gas calibration. This choice is only helped by the fact that we have one of the most capable calibration institutes in the world, FORCE Technology, just a short drive away, and with the opening of their MEGA Loop in May 2023, they will double both their flow and size capacity.
It is a corrective factor, which tells how close to the theoretical that the meter performs. For example, a venturi has a discharge coefficient of 0,995, where as a cone meter has one of 0,82. This is due to the difference in geometries and the placement of the pressure tappings.
Reynolds number is essentially an indicator of the behaviour of the flow. In very rudimentary terms, it describes if the flow is laminar or turbulent. However, a requirement of the standard is that all flow is turbulent, in other words, a Reynolds number of over 5,000 to 200,000, depending on the type of flow meter. Reynolds number is calculated as:
where Re is the Reynolds number, ρ is the fluid density, V is the velocity in the pipeline, D is the pipe inner diameter, and μ is the dynamic viscosity of the fluid.
Cookie | Duration | Description |
---|---|---|
cookielawinfo-checkbox-advertisement | 1 year | Set by the GDPR Cookie Consent plugin, this cookie is used to record the user consent for the cookies in the "Advertisement" category . |
cookielawinfo-checkbox-analytics | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". |
cookielawinfo-checkbox-functional | 11 months | The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". |
cookielawinfo-checkbox-necessary | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". |
cookielawinfo-checkbox-others | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. |
cookielawinfo-checkbox-performance | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance". |
elementor | never | This cookie is used by the website's WordPress theme. It allows the website owner to implement or change the website's content in real-time. |
viewed_cookie_policy | 11 months | The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data. |
Cookie | Duration | Description |
---|---|---|
_ga | 2 years | The _ga cookie, installed by Google Analytics, calculates visitor, session and campaign data and also keeps track of site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognize unique visitors. |
_ga_* | 1 year 1 month 4 days | Google Analytics sets this cookie to store and count page views. |
_gat_UA-* | 1 minute | Google Analytics sets this cookie for user behaviour tracking. |
_gat_UA-151202324-1 | 1 minute | A variation of the _gat cookie set by Google Analytics and Google Tag Manager to allow website owners to track visitor behaviour and measure site performance. The pattern element in the name contains the unique identity number of the account or website it relates to. |
_gid | 1 day | Installed by Google Analytics, _gid cookie stores information on how visitors use a website, while also creating an analytics report of the website's performance. Some of the data that are collected include the number of visitors, their source, and the pages they visit anonymously. |
CONSENT | 2 years | YouTube sets this cookie via embedded YouTube videos and registers anonymous statistical data. |
VISITOR_INFO1_LIVE | 5 months 27 days | YouTube sets this cookie to measure bandwidth, determining whether the user gets the new or old player interface. |
YSC | session | Youtube sets this cookie to track the views of embedded videos on Youtube pages. |
yt-remote-connected-devices | never | YouTube sets this cookie to store the user's video preferences using embedded YouTube videos. |
yt-remote-device-id | never | YouTube sets this cookie to store the user's video preferences using embedded YouTube videos. |
yt.innertube::nextId | never | YouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen. |
yt.innertube::requests | never | YouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen. |