chart.js 2.1

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.0/Chart.bundle.min.js"></script>
<canvas id="chart"></canvas>

JavaScript

var ctx = document.getElementById("chart").getContext("2d");
var myChart = new Chart(ctx, {
  type: "line",
  data: {
    "labels": [
      "01.12.2015",
      "02.12.2015",
      "03.12.2015",
      "04.12.2015",
      "30.12.2015"
    ],
    "datasets": [{
      "label": "DEA Burrweiler Druck Abgabe",
      "fill": "false",
      yAxisID: "y-axis-0",
      "data": [
        8.7913,
        8.6985,
        8.7914,
        8.7948,
        8.7882
      ]
    }, {
      "label": "DEA Burrweiler Druck Zulauf",
      "fill": "false",
      yAxisID: "y-axis-0",
      "data": [
        4.5997,
        4.5526,
        4.5915,
        4.5937,
        4.5795
      ]
    }, {
      "label": "DMS Flemlingen Durchfluss",
      "fill": "false",
      yAxisID: "y-axis-1",
      "data": [
        1.9588,
        2.4226,
        2.1392,
        2.223,
        1.9048
      ]
    }]
  },
  options: {
    scales: {
      yAxes: [{
        position: "left",
        "id": "y-axis-0"
      }, {
        position: "right",
        "id": "y-axis-1"
      }]
    }
  }
});