US3842669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring quantities of heat used in hot-water heating installations
Assignee: Danfoss AS
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Filing: 1973-03-08
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Granted: 1974-10-22
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Expires: 1993-03-08
Abstract
Abstract The invention relates to apparatus for measuring quantities of heat used in hot water heating installations. The product of (1) the flow rate and (2) the difference between the supply and return temperatures is integrated. The apparatus includes a flow meter which provides an electrical output signal, two temperature sensors associated respectively with the supply and return pipes of the system, a differential amplifier and an integrator. An output signal from the flow meter is tapped off across an electrode gap extending substantially at right angles to the flow and to the magnetic field.
Inventors
- 👤 P Iversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/06; G01K17/08; G01K17/10; G01K17/12; G01K17/16; G01F; G01F1/00; G01F1/56; G01F1/58; G01P; G01P5/00; G01P5/08; G01P5/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
Apparatus for measuring quantities of heat used in hot water heating installations comprising a unit for receiving heated water having an inlet and an outlet, inlet and outlet pipes connected to said inlet and outlet of said unit, a differential amplifier having an input and an output, two temperature sensors respectively in said pipes in the vicinities of said inlet and outlet and being electrically connected to said input of said amplifier, an inductive flow meter having an input coil and output means for providing an electrical output signal which comprises an electrode gap disposed at right angles to the fluid flow and magnetic field, said input coil of said flow meter being electrically connected to said output of said amplifier to provide a field strength for said meter proportional to the output current of said amplifier, and an integrator connected to said output means of said flow meter.
Claim 2
Dependent Claim
149 words
Apparatus for measuring quantities of heat used in hot water heating installations comprising a unit for receiving heated water having an inlet and an outlet, inlet and outlet pipes connected to said inlet and outlet of said unit, a differential amplifier having an input and an output, two temperature sensors respectively in said pipes in the vicinities of said inlet and outlet and being electrically connected to said input of said amplifier, an inductive flow meter having an input coil and output means for providing an electrical output signal which comprises an electrode gap disposed at right angles to the fluid flow and magnetic field, said input coil of said flow meter being electrically connected to said output of said amplifier to provide a field strength for said meter proportional to the output current of said amplifier, and an integrator connected to said output means of said flow meter.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 wherein said output current of said differential amplifier is an alternating energizing current which is supplied to said flow meter.
Claim 4
Dependent Claim
13 words
Apparatus according to claim 1 wherein said temperature sensors are temperature responsive resistors.
Claim 5
Dependent Claim
12 words
Apparatus according to claim 1 wherein said temperature sensors are thermocouple elements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |