Mechanical Counter with Back Run Stop ²⁶

Mechanical Flow Meter with Back-Run Stop: Scientific Precision for Hydraulic Monitoring

The industry standard for exact water flow quantification in plankton nets and stationary applications, ensuring rigorous data integrity through integrated back-run stop technology.

The Mechanical Flow Meter with back-run stop is a specialized precision instrument designed for the most demanding oceanographic and limnological research. Its primary application is the accurate determination of the volume of water passing through a plankton net, although its robust design also makes it ideal for stationary monitoring in rivers and outfalls. By utilizing a three-blade impeller directly coupled to a non-resetting five-digit counter, the device provides a reliable mechanical record of every revolution during deployment.

Engineered for vertical operations, the "back-run stop" feature is critical for maintaining sample integrity, as it prevents the counter from registering reverse movements that could skew results. Constructed from a high-performance combination of plastic and titanium, the flow meter offers exceptional durability and corrosion resistance in aquatic environments. With a constant hydraulic pitch of 0.3 meters per revolution, researchers can easily convert mechanical counts into precise towing distances and volumetric data, ensuring that every expedition yields high-quality scientific evidence.

Key Features

• Integrated Back-Run Stop: Specifically designed for vertical deployments to ensure the counter only records forward flow.
• Precision Engineering: Features a three-blade impeller coupled to a five-digit mechanical counter.
• Robust Materials: Built with titanium and technical plastics for maximum resistance in saline and freshwater environments.
• Versatile Deployment: Suitable for both towed equipment like plankton nets and stationary flow monitoring.
• High Accuracy: Delivers measurements within ± 5% in the primary range of 0.6 to 10 m/s.
• Easy Installation: Features a triple-point nose piece connection for secure mounting inside net rings.
• Simplified Calculations: Standardized 0.3 m hydraulic pitch allows for rapid determination of filtered water volume.

• Specifications
• In the Box
• Documents

• Product ID	438 115
  Length	205 mm
  Body Diameter	32 mm
  Impeller Diameter	75 mm
  Materials	Plastic, Titanium
  Measuring Range	0.3 to 10 m/s
  Accuracy (0.6 - 10 m/s)	± 5%
  Accuracy (0.3 - 0.6 m/s)	± 10%
  Hydraulic Pitch	0.3 m per revolution
  Counter Range	99,999 revolutions
  Weight in Air	145 g

• • 1x Mechanical Flow Meter with Back-Run Stop
  • 1x Towing Bridle
• • Technical Datasheet HYDR-438-115 (English)
  • User Manual HYDR-438-115 (English)