For use in the Denver Water Service Area |
Material Specifications – 14
for
Magnetic Drive Displacement Type Water Meters
5/8 Inch Through One Inch
Frost Proof
1. General:
All magnetic drive displacement type water meters, 5/8 inch through one 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.
2. Main Cases:
Main cases shall comply with NSF/ANSI 61 requirements.
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. Wire lengths and type of wire will be clearly indicated on Denver Water’s purchase order. 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 require 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 or 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 will 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 numbers on the register 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 also be attached to the meter in 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.
The 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. Bottom Plates:
Breakable bottom plates shall be of cast iron or a copper alloy not containing less than 75% copper. Cast iron bottom plates shall be coated with baked enamel, to an extent adequate to protect the cast iron from corrosion and shall be provided with a plastic liner. The plastic liner shall not prevent the bottom plate from breaking as designed.
6. Piston/Disc Spindles, Thrust Rollers, and 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.
7. Chambers:
Chambers shall be made of copper alloy containing not less than 85% or suitable engineering plastic.
8. Measuring Chamber Diaphragms:
Measuring chamber diaphragms shall be of monel or stainless steel in accordance to AWWA C700 or suitable engineering plastic.
9. 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.
10. External Fasteners:
All external fasteners shall be stainless steel as described in AWWA C700.
11. Test Certifications:
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 form 39 representation of the Denver Water meter number.
12. 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: 400 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
* In special circumstances as approved by Denver Water Sales Administration and Customer Service Field Sections, a Double Check T-10 Meter with ProRead or AutoDetect absolute encoder register may be used in lieu of a standard meter and an RPZ backflow preventer. This meter is available in 5/8 inch size only.