Thin Plate Weirs

Our SIRIS thin plate weir range comes to fit standard sizes, including v-notch and rectangular weirs. We can also supply alternative size and specification weirs for applications where standard sizes cannot be used, such as large rectangular notch systems and compound weirs.

All SIRIS thin plate weirs are fabricated from marine-grade 316 stainless steel and machined by highly-accurate laser.

SIRIS thin plate weirs are guaranteed to meet MCERTS requirements and satisfy BS/ISO 1438.

Request info
Ideal for cleaner effluent

Thin plate weir devices are simple devices used for liquid flow measurement where high accuracy is required, and are ideal for testing cleaner effluent, such as industrial discharge and final effluent outfall applications.


Long term and reliable flow measurement

Most of the standard size thin plate weir range come with a solid built-in approach fabrication which significantly reduces the likelihood of head gauging errors in the completed structure.

When designed and installed properly SIRIS weirs provide accurate long term and reliable flow measurement.

Accurate & reliable data

SIRIS weirs carry MCERTS accreditation so you can be confident that the data provided will provide accurate and reliable long-term flow measurement.

Our thin plate weir range is designed in accordance with BS/ISO 1438 and BS/ISO 4359 and will meet with relevant regulatory discharge and MCERTS requirements.

All SIRIS products are compatible with our web-based data recording software, which allows quick and easy access to your data at any time – from any location.

Design & installation

We pride ourselves in offering a bespoke service to all of our clients. Our design and installation process ensures we provide you with a cost-effective solution tailored to suit your site’s individual requirements.When you first contact SIRIS, our friendly team will be on hand to take your enquiry and assess your needs. We know that every site has different requirements, so we’ll work closely with you to understand your individual needs.

What is the CSA Group? If you've been researching your trade effluent discharge requirements, you'll likely have come across the CSA Group. But what does the CSA Group actually do and how can it help you? CSA Group (formerly Canadian Standards Association) develops certification compliance standards in a range of areas. It provides a number of services worldwide and is… Read article
Guide to: Consent to discharge trade effluent Do you think your business might need consent to discharge trade effluent? Navigating your responsibilities can be confusing. Our guide answers some frequently asked questions about consent to discharge and the steps your business needs to take.  What is trade effluent? Trade effluent is any liquid waste your business discharges to the UK's water ways… Read article

Compatibility with site systems

Weir plates are generally simple to install and fit within your existing set-up.

All SIRIS products can be used with our data monitoring software, Palette, however they are also compatible with your existing SCADA system. Our expert team is committed to working in partnership with our customers to meet their individual requirements and ensure our products fit seamlessly into each site.

Nick Richardson says...

“SIRIS thin plate weirs come in a range of sizes, including v-notch and rectangular. We’ll work closely with you to provide the most cost-effective solution for your site and guarantee that it meets your requirements – as well as pass MCERTS inspections.”

Meet the team