Danfoss A/s

Bertel Birker

Mogens T Paulsen

Henning M Hansen

Poul Christian Iversen

Mogens Bech Laursen

Gunnar Ernst Olsen

Mass flowmeter with bidirectionally wound oscillation detector

The invention relates to ultrasonic apparatus for measuring flow quantities and related parameters of a liquid flowing with a free surface in a channel. Two transducers are provided with one being mounted in the channel below the level of the flowing liquid. The other transducer is mounted on a float member which is floatable on the surface of the liquid. The transducers are effectively positioned from each other and a measuring path is formed therebetween which has components in the vertical direction and in the direction of flow. There is a measuring circuit for determining the transit times of the ultrasonic waves in both directions and an evaluating circuit for determining the desired quantities with regard to the transit times.

Apparatus for measuring the flow quantity or associated parameters of a

The invention relates to ultrasonic apparatus for measuring flow quantities and related parameters of a liquid flowing with a free surface in a channel. Two transducers are mounted in longitudinally spaced relation to each other in the channel and below the level of the flowing liquid. The transducers are positioned and directed so that the effective measuring path therebetween is reflected from the underside of the liquid surface level and has components in the vertical direction and in the direction of flow. There is a measuring circuit for determining the transit times of the ultrasonic waves in both directions and an evaluating circuit for determining the desired quantities with regard to the transit times.

An electric storage heater assembly which includes a core and a resistance heater for the core. A charging switch is in series with the resistance heater and an electric comparator for operating the switch has two inputs connected to first and second controls which are responsive to the instantaneous temperature of the core and the final temperature of the core for the preceding charging period. The first comparator input is also connected to auxiliary controls which sense indoor and outdoor temperatures and provide signals which are summed with the signal which represents the core temperature.

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Sonderborg, Denmark

Bertel Birker