Besam Ab

Alfa Laval Corporate Ab

Nils Bjelk

Klas Bertilsson

Anders Nyander

Bo Norrgren

The invention refers to a heat exchanger plate and a plate heat exchanger. The heat exchanger plates are arranged beside each other in the plate heat exchanger to define several first plate interspaces for a first medium and several second plate interspaces for a second medium. Each heat exchanger plate comprises a heat transfer area, an edge area, which extends around and outside the heat transfer area, and a functional device, which is configured to receive or produce a signal. The heat exchanger plate also comprises a communication module provided on the heat exchanger plate. The communication module comprises an electronic circuit connected to the functional device and a module antenna. The communication module is configured to permit wireless communication of the signal with a master unit via the module antenna.

Heat exchanger plate and a plate heat exchanger

An arrangement for controlling operation of a motor operated door is provided with doppler radar sensors facing the approach to the door from both sides. The doppler signals from the sensors are analyzed to determine the presence of motion toward or away from the door and the door is controlled to open upon motion toward the door and close upon motion away from the door.

Apparatus for controlling the opening and closing of doors

The invention comprises a pulse transmitter (2,3) for infrared light, the reflected radiation from which is received by photo-diodes (5) converting the light pulses to electric pulses (FIG. 3), which are amplified (9) and applied to a balancing circuit (12), which operates digitally and with a given working or threshold level. Applied pulses give the output of the balancing circuit (12) a low state, which is supplied to a first integration circuit (16) having relatively rapid integration time, and which is in series with a second integration circuit (18). The integration circuits each control an input (21,26) of a comparison circuit (22), which generates an operation signal on its output (27,28) when there is a difference in integration conditions, the slower integration circuit (18) controlling the working or threshold level of the balancing circuit (12).

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Landskrona, Sweden

Nils Bjelk