Sewer Billing Meters are the cash registers of wastewater treatment plants. Just like in any business transaction, the customer (in this case the municipality) does not want to be overcharged for the service and the service provider (in this case the treatment facility) cannot undercharge and remain in business profitably. This is why it is so important to both parties that when the cash register rings, the charge for the service provided is unquestionably accurate. A 10% error in flow measurement at a 1MGD treatment facility will result in over- charges or under billings of more than $100,000 per year.
The Accuron CrossFire (pat. pend.) couples WinFlume computer aided Hydraulic Structure design with high accuracy Custody Transfer technology. Today, multipath transit-time flow meters are the first choice for custody transfer applications in the oil and natural gas industry.
Measurement of minimal flows is accomplished through Bureau of Reclamation WinFlume Hydraulic Structure technology supported by NIST traceable Flow Lab design confirmation.
Measurement of average to maximum flows is accomplished through dual path transit- time technology specifically developed for custody transfer of hydrocarbons.
Measurement of non-uniform flows is accomplished through crossed path transit-time technology specifically developed for the custody transfer of natural gas.
Open Channel Flow Monitoring
UNDER ALL CONDITIONS
During periods of minimal flow (Zero to 1/3 pipe I.D.), measurements are achieved through a highly efficient combination of a trapezoidal flume and ultrasonic level sensor. (see detail at right >)
During periods of maximum flow (1/3 to full pipe I.D.), measurements are achieved through proven area-velocity methods that combine an ultrasonic level sensor with transit-time velocity sensors.
Dual Path Cartridge Meters provide for highly accurate measurement of average velocity under asymmetrical, surcharged, and backflow conditions.
An optional non-contact Surcharge Monitor provides for continuous measurement of accurate flow data during intermittent periods of surcharged conditions.
Reverse flows, during abnormal or surcharge conditions, are measured by the bi-directional transit-time velocity sensors in combination with a single or dual level sensor.
In the event of a blockage or stoppage of flow, the velocity sensors will report a “zero flow” condition.
LOW FLOW MEASUREMENT
A casual investigation of collection system flow studies conducted by municipalities, government agencies and private engineering groups will quickly confirm that in 95% of the cases, the average flow in a sanitary sewer is only 30% - 40% of the pipe diameter with nighttime flows hovering around 5% - 10% of pipe I.D. This fact alone provides indisputable proof of the current need for a highly accurate Flow Meter capable of measuring flows under extremely low conditions.
LOW FLOW CAPABILITY
The low flow capability of the trapezoidal flume/level sensor design was proven within Eastech’s in-house NIST traceable Flow Metrology Lab when technicians were able to accurately (±2-3%) ascertain flows of 3 GPM within an 8” I.D. pipe.
|6 inch||2 gpm|
|8 inch||3 gpm|
|10 inch||2 gpm|
|12 inch||5 gpm|
|15 inch||12 gpm|
|18 inch||16 gpm|
Eastech combines two highly accurate and proven technologies within a single dual range unit. Low flows are consistently measured by an extremely reliable stainless steel trapezoidal flume/Teflon® level sensor combination. Higher flows are accurately ascertained by combining the same Teflon level sensor with a dual pair of non-fouling transit-time velocity sensors.
DUAL RANGE FLOW CAPABILITY
LOW RANGE (Hydraulic Structure)
Below the Crossover Point (1/3 pipe), the volume of flow is measured by a trapezoidal flume and level sensor utilizing U.S. Bureau of Reclamation flume equations.
HIGH RANGE (Area-Velocity)
Above the Crossover Point (1/3 pipe), the volume of flow is measured by a pair of transit-time velocity sensors and level sensor utilizing proven area-velocity measurement methods.
FACTORY PROGRAMMED FLOWMETERS
Pre-programmed at the factory for specific customer applications, the Accuron flowmeter is a highly advanced microprocessor-based ultrasonic flow transmitter for extremely precise measurement of flow in open channels.
The Accuron has a built-in datalogger with eight distinct channels for logging flow and totals.
Daily Averages: Daily summary allows viewing of the previous eight days.
Logger Graph: In addition, a bar graph may be visually displayed on the Accuron.
Data Retrieval: Logger data can be collected by using a laptop computer or an optional modem installed within the Accuron enclosure.
FLOW DATA GRAPHING PACKAGE
QTrend is an Excel Workbook Flow Data Graphing Package specifically designed to interface with every meter offered within the Eastech product line.
NIST Flow Lab Traceability
Prior to field shipment, each Cartridge Meter is NIST traceable tested, calibrated and certified at Eastech's Flow Metrology Laboratory under the identical size and flow conditions specified for its ultimate application.
A stainless Cartridge, pre-sized for its specific application, arrives at the job site as a fully integrated unit. Every component is factory precision aligned, calibrated and programmed in strict accordance to customer supplied operating specifications.
By utilizing “above the flow” ultrasonic level sensors and non-fouling velocity sensors, the Cartridge Meter remains free from the ongoing problems of sediment build-up, fouled sensors and accumulated debris.
Qtrend is an Excel Workbook Flow Data Graphing Package specifically designed to interface with every Cartridge Meter. It incorporates specific formulas capable of charting and displaying all of the data collected by the meter's onboard logger.
Flume with Level Sensor vs Cartridge Meter
Fully Operational in 20 Minutes
Eastech guarantees accuracy and cost efficiency by providing the end user with a pre-engineered field ready system designed for "out of the box" installation. A single cartridge, pre-sized for its specific application, arrives at the job site as a fully integrated unit, requiring only 30 minutes for installation. Every component is factory precision aligned, calibrated and programmed in strict accordance to customer supplied operating specifications.
Brochures / Tech Briefs / IOM’s / Forms
Permanent: Billing Meter
WHY THE CARTRIDGE METER
A Comparative Analysis
PROTECTING THE MONEY STREAM
Sewer Billing Meters
THE ECONOMICS OF WASTEWATER FLOW MONITORING