Thel-mar Weir

The Thel-Mar Volumetric Weir is a practical and economical calibrated measuring device used to determine infiltration in newly installed sewer lines, as well as substantial flows in existing pipes. The weirs offer the advantage of a 90-degree v-notch for measuring small infiltration flow where accuracy is paramount. The rectangular portion of the compound weir measures larger volume flow rates. The faceplates are laser engraved and cut for easy viewing.

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Advantages

  • The faceplate is engraved with both level and flow measurements so you can easily see and record the flow rate of water in a pipe or channel
  • As the water level in a pipe increases so does the flow rate
  • Multiple sizes available. From 150mm to 400mm diameters
  • Compatible with Van Walt’s Data Collection systems
  • Easy to install and maintain
  • Made from durable materials – Lexan, stainless steel and reinforced composites
  • Designed for durability and reliability, they ensure consistent performance in industrial, municipal, and environmental applications.

Thel-mar Weir

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+44 (0) 1428 661 660 Call Van Walt
+64 (0)3443 5326 Call Van Walt
+27 21 518 1347

Thel-mar Weir Equipment Options:

Applications

  • Edge of field monitoring
  • Wastewater Collection
  • Toe drain monitoring
  • Hydroelectric power stations
  • Stormwater Management
  • Process Monitoring

Specifications

Wetted Material
304 Stainless Steel, Rubber, Acrylic
Flow Range
Up to 430GPM/27LPS
Sized for
DN150, DN200, DN250, DN300, DN350 and DN400 with adapters up to DN1200 for ultra-low flow in larger diameter pipes.
Accuracy
5% within V-Notch, 2% within rectangular section
Standard Parts
Standard Part Numbers
Size
Flow Range
TMW-6
6″ (DN150)
0-32GPM
TMW-8
8″(DN200)
0-86GPM
TMW-10
10″(DN250)
0-162GPM
TMW-12
12″(DN300)
0-251GPM
TMW-14
14″(DN350)
0-251GPM
TMW-15
15″
0-430GPM
TMW-16
16″ (DN400)
0-430GPM
Bubbler Tube Parts
Bubbler Tube Part Numbers
Size
Flow Range
TMW-6B
6″ (DN150)
0-32GPM
TMW-8B
8″(DN200)
0-86GPM
TMW-10B
10″(DN250)
0-162GPM
TMW-12B
12″(DN300)
0-251GPM
TMW-14B
14″(DN350)
0-251GPM
TMW-15B
15″
0-430GPM
TMW-16B
16″ (DN400)
0-430GPM
Adapters for pipes up to 42” are available

Resources

Manuals & Downloads

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+44 (0) 1428 661 660 +64 (0)3443 5326 +27 21 518 1347