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function GetSingleBytes(sWert: Single): string;
type
 PByteArray = ^TByteArray;
 TByteArray = array[0..3] of Byte;

var
 pByte:   PByteArray;
 tByte:   ^Byte;
 Counter: Integer;

begin
        tByte:=@sWert;
        result:='';

        for counter:=0 to SizeOf(Single)-1 do
        begin
         result:=result+IntToHex(tByte^,2)+' ';
         Inc(tByte,sizeof(Byte));
        end;

        // oder so :

        pByte:=@sWert;
        result:='';
        for counter:=Low(pByte^) to High(pByte^) do
        result:=result+IntToHex(pByte^[counter],2)+' ';
end;