For use in the Denver Water Service Area |
Material Specifications – 15
for
Magnetic Drive Displacement Type Water Meters
1-1/2 inch And 2 inch
1. General:
All magnetic drive displacement type water meters, 1-1/2–inch and 2–inch, furnished under this standard, shall be manufactured in strict accordance with the latest edition of AWWA C700, C707 and C702 with the following additional requirements. The meter may be of a nutating disc or oscillating piston type. Meters shall be designed for easy removal of internal parts without disturbing the connections to the pipeline or removal of the meter. Stainless steel mounting bolts and flange gaskets shall be furnished with each meter.
2. Main Cases/Flanges:
Main cases shall comply with NSF/ANSI 61 requirements. Flanges shall be two hole, oval type and shall not have slotted holes. The flanges shall be an integral part of the main case and shall be of the same material. Flanges shall not be removable from the main case.
3. Registers/Register Boxes:
Registers shall comply with AWWA C707 and shall be electronic digital encoder or mechanical encoder registers, with a permanent "potted" wire connection for Itron Encoder-Receiver-Transmitter (ERT) unit. Meters intended for pit installation shall be factory wired and potted to a wiring harness attached to a water tight quick connect terminal approved by Itron. Meters intended for indoor installation shall be factory wired and potted to a length of wire for later connection to an Itron remote ERT. Only meter brands and models with registers certified or approved by Itron, Inc., as compatible with its ERTs shall be acceptable. If the encoder registers require programming to properly operate with the Itron remote and pit ERTs, each register shall be delivered pre-programmed to provide electronic readings for 6 dials or 3 boards as appropriate for the brand of meter. Register must be compatible with Itron ERTs using standard Itron ROCLs. Registers that requires the ERT to use WYSISYG-ROCLs are not acceptable. Registers shall be straight reading, magnetic drive, U.S. gallons, permanently sealed and protected from the environment and tampering by a formed joint that can be unsealed only by destroying one or more of the components forming the joint. Registers shall comply with AWWA C700, Table 4. Number wheels or stationary zeros used for billing purposes (1,000 gallons and up) shall have black numbers against white background. All digits under 1,000 gallons (whether stationary or movable) shall be white numbers with black background. The register shall be equipped with a test hand and test index circle or test hand and graduated test number wheel.
Register boxes shall be equipped with a register cap and shall completely cover the register lens. The register cap shall be capable of being moved to another register to preserve a match between the stamped meter number on the register cap and on the meter main case. The register box shall attach to the outer case of the meter by use of an interior or exterior locking device.
4. Meter Numbers:
The Denver Water meter number shall be plainly chisel stamped on the meter main case and on brass register caps. This meter number shall be heat stamped in a contrasting color on plastic register caps. The Denver Water meter number shall be attached to the meter in a bar code form 39 using a separate tag. Dimple type stamping methods and paper or plastic number labels affixed to the register are not acceptable.
Manufacturer’s serial numbers shall run consecutively for each meter in the group ordered and shall be stamped on the top of the register cap.
5. Piston/Disc Spindles, Thrust Rollers, and Thrust Roller Bearing Plates:
Piston/disc spindles, thrust rollers, and thrust roller bearing plates shall be of monel or stainless steel in accordance with AWWA C700 or suitable engineering plastic.
6. Chambers:
Chambers shall be made of copper alloy containing not less than 85% copper or suitable engineering plastic.
7. Measuring Champer Diaphragms:
Measuring chamber diaphragms shall be of monel, stainless steel or suitable engineering plastic.
8. Drive Spindle:
Up shaft or drive spindle shall be stainless steel or suitable engineering plastic. Driving pawl and magnet shall be securely fastened to drive spindle in a manner preventing loss of pawl during normal operation of the water meter.
9. External Fasteners:
All external fasteners shall be stainless steel as described in AWWA C700.
10. Tests:
All meters shall comply with American Water Works Association test requirements for new coldwater displacement type water meters. Each meter shall be furnished with a tag attached to the meter displaying the results of the certified accuracy tests performed by the manufacturer. This tag shall identify the meter by the manufacturer’s meter number, the Denver Water meter number, and a bar code representation in form 39 of the Denver Water meter number.
11.Acceptable Manufacturers:
AMCO Water Metering Systems, Inc.: C700 with Pulser Digital Register
Badger Meters, Inc.: Recordall Disc Series Meter with RTR Pulser Register
Hersey Meters/Mueller Group: 500 Series IIS with ER electronic register and Itron reed switch assembly
Neptune Technology Group: T-10 Meter with ProRead or AutoDetect absolute encoder register
Sensus Metering Systems: SR or SRII Sealed Register Meter with ECR or ICE encoder register programmed to Denver Water’s specific requirements