Halmi Nozzle

HN Halmi Nozzle

+/- 2.00% Uncalibrated Uncertainty
Low Cost, Open Channel Application

  • Line size: 6 to 48 inches
  • Head loss: Low
  • Service life: 25 years plus depending on materials


The Halmi Nozzle is an open channel device and was developed for free discharge into tanks or lagoons. It’s ideally used for open channel sewage or sludge. Basic accuracy of +/-2.0%. Calibrated accuracy of +/-1.0%. Lower head loss compared to other free discharge devices.


Line Size
Standard sizes are 6” to 48”
Head loss
Basic Accuracy (%)
+/- 1.0 of max rate (Calibrated) +/- 2.00 of max rate (Uncalibrated)
Upstream Piping
Level, but can be designed for higher velocity flows
Useful Service Life
25 years plus depending on material
Service Functional Limits
Dirty liquids, sewage or sludge, clean liquids
Open channel free discharge of liquids, sewage, sludge
Common Materials
Carbon Steel, Stainless Steel, Fiberglass
Other Available Materials not limited to

Support and Service

In addition to a wide range of differential producing Venturi flow meters, orifice plates, WedgeType™ flow meters, and open channel flow elements, PFS provides comprehensive, specialized services for new and existing flow meters, including rehabilitation, hydraulic analysis, and full engineering support.


ISO 9001, ASME S&U, PED Certified, CRN.

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