Installation of Mags

• What details need to be planned out?• Manufacture requirements• IDWR requirements• Site selection for installation• Examples of good and bad installations

Application Considerations• Size?• Piping Configurations?• Meter Mounting or Remote?• Available power supply?• Grounding !!

Details• Electronics

– Can be direct mount or remote mounted– Generally have a NEMA 4 (IP 66)or better rating for enclosure

and protection of the electronics from dust, and spray down• DC operated verses AC operation

– DC operation runs 3-6 years on a battery pack– Hard wired to 110 AC voltage

• The use of dry transformers to get voltage down from 480 to 110

• Remote mount– LCD and sunlight– A little care will go a long way

Manufacture requirements

• Most require 3 diameters of straight unobstructed pipe above and 2 diameters below.– The meter its self acts as a portion of those

lengths due to unobstructed flow through the flow tube

– Example- 10 inch diameter meter would require 30 inches upstream of the meter and 20 inches below the meter

Manufacture requirements

• Grounding!!!• If stray voltage is present in the system (generally

electrically derived not mechanically) the mag sensors will pick up any change in voltage due to strays and give erroneous readings.– Grounding rings are easier to install initially rather

than after the fact– Must have grounding rings as part of the installation

if: • Meter is installed in PVC• A VFD drive operates the system

Manufacture Requirements

• Meter orientation– May have some specific

requirements.

– Meter must be installed at a 10 or 2 in the pipe

• Ask questions if you are unsure of how to proceed.

IDWR Requirements

• Clamp on Ultrasonic measurements• Need 10 diameters upstream and 5

downstream to achieve 1% accuracy• The more straight run of unobstructed pipe

the better

Site Selection

Good installations

Good installations

Good installations

Not so good installations

Not so good installations

Not so good installations

Wrap up

• Measurement plans for each well will help to insure installation is done right the first time

• If you have questions ask someone • Accurate measurements begin with a good

meters and better installation• Water users are ultimately responsible for

install and maintenance of flow meters