Wis. Admin. Code Public Service Commission PSC 185.65

Current through November 25, 2024

Section PSC 185.65 - Accuracy requirements for meters

(1) The test flow limits for positive displacement, compound, and turbine meters shall be as follows:

Meter Size (inches)	Minimum Test Flow (g.p.m.)	Normal test flow limits (g.p.m.)
5/8	1/4	1-20
3/4	1/2	2-30
1	3/4	3-50
1 1/2	1 1/2	5-100
2	2	8-160
Compound Meters
2	1/2	2-160
3	1	4-320
4	1 1/2	6-500
6	3	10-1,000
8	4	16-1,600
10	8	32-2,300
12	14	32-3,100
Turbine Meters*
2	10	16-160
3	15	24-350
4	20	40-600
6	30	80-1400
8	50	144-2,500
10	75	224-3,800
12	100	320-5,800
16	150	400-11,500

Note: See AWWA Standards C-700 (Positive Displacement Meters), C-702 (Compound Meters), and C-701 (Turbine Meters).

Note: * See s. PSC 185.61(1).

(2) Positive displacement meters shall have a percent registration betwee n 98.5 and 101.5 within the range of normal test flow limits before being placed in service. In addition, new meters shall have a percent registration at the minimum test flow between 90 [95] and 101.5. In all other cases, the percent registration shall be between 90 and 101.5 before being placed in service. These requirements, in addition to flow, are shown in the table below.

Note: It is the intent of the commission that new meters have an accuracy limits percent between 95 and 101.5.

Summary of Test Conditions and Accuracy Requirements for Positive Displacement Meters

Maximum Rate				Intermediate Rate				Minimum Rate
Size in.	Rate of Flow	Test Quantity		Accuracy Limits	Rate of Flow	Test Quantity		Accuracy Limits	Rate of Flow	Test Quantity*		Accuracy Limits Percent
	gpm	Gal.	Cu. Ft.	Percent	gpm	Gal.	Cu. Ft.	Percent	gpm	Gal.	Cu. Ft.	New Meters	Repaired Meters
5/8	15	100	10	98.5-101.5	2	10	1	98.5-101.5	1/4	10	1	95-101.5	90-101.5
3/4	25	100	10	98.5-101.5	3	10	1	98.5-101.5	1/2	10	1	95-101.5	90-101.5
1	40	100	10	98.5-101.5	4	10	1	98.5-101.5	3/4	10	1	95-101.5	90-101.5
11/2	80	1.000	100	98.5-101.5	8	100	10	98.5-101.5	11/2	100	10	95-101.5	90-101.5
2	120	1.000	100	98.5-101.5	15	100	10	98.5-101.5	2	100	10	95-101.5	90-101.5

* Section PSC 185.73(3) provides that at this flow rate the test quantity may be reduced to that equivalent to one-half revolution of the test dial. For the typical 5/8-inch meter the minimum test quantity would, therefore, be 5 gal. or 1/2 cu. ft.

(3) Compound meters shall have a percent registration between 97 and 103 throughout the range of normal test flow limits. At flows within the change-over flow range, the percent registration shall not be less than 90%.

(4) Turbine meters shall have a percent registration between 97 and 103 throughout the range of normal test flow limits and a percent registration of at least 95% at the minimum test flow.

(5) For meter installations with remote reading devices the above accuracy requirements apply to the metering accuracy of the complete installation.

Wis. Admin. Code Public Service Commission PSC 185.65

CR Register, January, 1997, No. 493, eff. 2-1-97.