Flow measurement

Simultaneous measurement and registration of incoming and overflowing water – Flow in open gutters and ski tables

  • Calculate mass balance and target values ​​by measuring and recording incoming and outgoing water flow. – Measure and document flooding of untreated or partially treated water.

Immersion sensor FLX for measuring the flow as a function of the level in open channels.


Good sampling without dirty sample cup – COW

Incoming wastewater contains dissolved and particulate matter. A representative sample assumes that the sampler is able to pick up both large and small, light and heavy particles. At high suction heights, 3-6 meters, there is a risk that heavier particles or flocks will settle in the suction hose and that the sample will therefore not be representative.

For pressure heights exceeding 3 meters, in pump pits, etc., the “pre-stressed vacuum” function is selected in the COW sampler menu. The sampling cup will then be evacuated before the valve to the urging hose is opened. The residence time in the hose is minimized and sedimentation is avoided.

The built-in automatic cleaning in COW prevents bioskin and fat deposits from building up and facilitates manual cleaning.

Sample storage

Safe cold storage of samples in demanding environments with refrigerators WS 312 and WS 316

The rules for sampling and sample storage stipulate that the sample collection vessel is stored at a maximum of +4 degrees during the sampling period. Refrigerators WS 312/WS 316 are completely made of stainless steel SS 2333, which makes the cabinet resistant to hydrogen sulphide and moisture. The refrigerators have enclosure class IP 54 and meet the requirements set by the Swedish Electrical Safety Authority for enclosure on equipment located in wet areas.

In the past, standard white refrigerators were usually used. They do not meet today’s requirements regarding components and are attacked by hydrogen sulphide and corrosion, which endangers function and personal safety.

Diurnal variations or heavy leaks

Control and optimize dosage by measuring susphalt.

The chemical dose during precipitation is usually controlled by incoming flow. It is assumed that the load in terms of total phosphorus, etc., is proportional to the flow. This is not always true. With normal diurnal variations or heavy infiltration due to precipitation or snowmelt, situations arise when precipitation chemicals are overdosed. In such situations, the dose is usually adjusted manually.

By measuring the susphalt with the susphalt meter CTX20/25 on incoming water on-line together with the flow, the dosage can be optimized. A basic dose, which can be kept low, is controlled solely by flow, while the susphalt meter orders a supplemental dose if necessary. Savings of up to 20-25% have been achieved through this procedure.