Modular utility meter

• US 6,952,970 B1
• Filed: 05/26/2000
• Issued: 10/11/2005
• Est. Priority Date: 05/28/1999
• Status: Expired due to Fees

• Current Assignee: Fusion Meters Limited
• Original Assignee: Fusion Meters Limited
• Inventors: Hallows, Stuart, Fairman, Mark, Furmidge, Neil
• Primary Examiner(s): PATEL, HARSHAD R
• Application Number:
  US09/979,799
• Time in Patent Office: 1,964 Days
• Field of Search: 738/611.9, 732/73, 738/618.8, 738/619.3
• US Class Current: 73/861.19
• CPC Class Codes: G01F 1/075 with magnetic or electromagnetic coupling to the indicating device
• CPC Class Codes: G01F 1/3227 using fluidic oscillators fluidic oscillators per se F15C1/00
• CPC Class Codes: G01F 1/3287 circuits therefor
• CPC Class Codes: G01F 15/14 Casings, e.g. of special material

Abstract

A modular utility meter (1), for example, a water meter, is provided which comprises a meter base (2) and a meter head (3). The output signal from a transducer in the meter base (2) it processed in the meter head (3) to calculate the utility supply. The processing includes linearization of the signal using calibration data stored in the meter base (2). Therefore, any meter head may be combined with a meter base containing any different type of transducer.

Claims

1. A meter, comprising:

first and second detachably connected portions, wherein the first portion includes;

a flow measuring transducer that produces a flow measurement signal that varies non-linearly with flow rate; and

storage means containing data specific to the transducer that represents a relationship between the flow measurement signal generated by the transducer and the flow rate measured by the transducer, and the second portion includes;

processing means for processing the flow measurement signal from the transducer and the transducer specific data to produce an output signal representative of flow but independent of transducer characteristics represented in the transducer specific data, such that the output signal varies substantially linearly with flow rate.

2. A meter according to claim 1, wherein the meter comprises a water meter.

3. A meter according to claim 1, wherein the transducer comprises a fluidic oscillator.

4. A meter according to claim 1, wherein the first portion of the meter includes an amplifier and filter for amplifying and filtering the flow measurement signal from the transducer.

5. A meter according to claim 1, wherein the second portion of the meter includes a power supply for the first and second portions of the meter.

6. A meter according to claim 1, wherein the second portion of the meter includes a display for displaying the meter reading.

7. A meter comprising:

first and second detachably connected portions, wherein the first portion includes;

a flow measuring transducer for producing a pulsed output responsive to fluid flow, wherein the frequency of the pulsed output varies non-linearly with the flow rate; and

storage means containing data specific to the transducer that represents the relationship between the flow measurement signal generated by the transducer and the flow rate measured by the transducer; and

the second portion includes;

processing means for processing the flow measurement signal from the transducer and the transducer specific data using a linearization algorithm to produce an output signal representative of flow but independent of the transducer characteristics represented in the transducer specific data, such that the output signal varies substantially linearly with the flow rate.

8. The meter according to claim 7, wherein the meter comprises a water meter.

9. The meter according to claim 7, wherein the transducer comprises a fluidic oscillator.

10. The meter according to claim 7, wherein the first portion of the meter includes an amplifier and filter for amplifying and filtering the flow measurement signal from the transducer.

11. The meter according to claim 7, wherein the second portion of the meter includes a power supply for the first and second portions of the meter.

12. The meter according to claim 7, wherein the second portion of the meter includes a display for displaying the meter reading.