McCrometer | News Releases

Dependable StormWater Flow Meter Delivers High Accuracy In Widely Variable Conditions
Ideal For Airports and Bases, Building Roof-Tops, Construction Sites, Industrial Plants, Public Parking Structures & Lots, Roadways & Bridges and School Districts

Facility and infrastructure engineers responsible for pollution and flood control will find the advanced Marsh Multi-Mag™ Flow Meter from McCrometer provides a reliable, scalable and economical solution to measuring and monitoring highly variable flows of stormwater run-off.

Stormwater and snowmelt run-off are a public environmental concern subject to state and federal agency clean water regulations designed to protect the nation’s streams, rivers and lakes. Run-off that comes into contact with impervious surfaces such as buildings, parking lots or roads causes both pollution and flood control problems. These liquid flows are widely variable and unpredictable, which makes measuring and monitoring them a challenge for conventional single-point flow meters.

The innovative Multi-Mag Flow Meter is an advanced multi-point measurement solution that provides unprecedented accuracy in the most difficult flow conditions -- such as low flows, wide flow ranges, and flows containing sand and grit. It measures liquid volumetric flow rates in pipes sized from 4 to 120 inches (100 mm to 3000 mm) with a streamlined multi-point technology that creates only negligible pressure loss.

Using a unique insertable electromagnetic averaging design, the Multi-Mag measures volumetric flow with accuracy up to ±1% of reading (from 0 to +20 feet / second + zero stability) and repeatability at 0.20 percent of the flow range. In addition to stormwater management, the Multi-Mag is ideal for many other applications that include custody transfer, filter balancing, filter backwash, water treatment processes, distribution management, and well head flows. The Multi-Mag constantly profiles the flow, ensuring unsurpassed accuracy. Other benefits include a high turndown ratio, automatic sensing and correction for shifting profiles, and reduced operating costs due to its lower energy requirements compared to most flow meters.

The Multi-Mag features a 4-20 mA analog output that is galvanically isolated and fully programmable for zero and full scale. Dual alarms (2 separate outputs) are provided and fully programmable for high/low flow rates, percent of range, empty pipe, forward / reverse, polarity (normally opened/closed) and more.

The Multi-Mag is a breeze to install and use. Facility and municipal water system engineers find the unit installs in minutes without shutting down the system and removes easily through standard valves.

A rugged transmitter enclosure that is NEMA 4X/IP65 approved for harsh operating environments is available for the Multi-Mag. Separate termination and electronics compartments are provided for superior reliability and safety. A clear window is available for local field readings and inspection.

Until recently, expensive spool-piece magmeters, turbine meters, and other insertable flowmeters that only provide a single point measurement were utilized in many water and waste facilities. After years of extensive testing and thousands of installations worldwide, the Multi-Mag Flow Meter provides multiple measuring points precisely positioned according to pipe size to make it the most accurate flow meter available.