Array
(
    [name] => HeatDetectorClasses
    [title] => BS EN 54-5 Heat Detector Classifications
    [content] => <p>
  BS EN 54-5 – Fire detection and fire alarm systems. Heat detectors. Point heat detectors. – classifies the response temperature ranges and times in which heat detectors must respond. The most common classes are A1, A2, B, and C, though there are other classes available for specialist applications in high-temperature environments. Optionally, manufacturers can use the 'S' suffix if their detector only responds according to the table below:
</p>
<table class="technical-data" width="100%" cellspacing="0" cellpadding="0">
  <thead>
    <tr>
      <th style="20%">Detector Classification</th>
      <th style="20%">Typical Application Temperature °C</th>
      <th style="20%">Maximum Application Temperature °C</th>
      <th style="20%">Minimum Static Response Temperature °C</th>
      <th style="20%">Maximum Static Response Temperature °C</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th>A1</th>
      <td>25</td>
      <td>50</td>
      <td>54</td>
      <td>65</td>
    </tr>
    <tr>
      <th>A2</th>
      <td>25</td>
      <td>50</td>
      <td>54</td>
      <td>70</td>
    </tr>
    <tr>
      <th>B</th>
      <td>40</td>
      <td>65</td>
      <td>69</td>
      <td>85</td>
    </tr>
    <tr>
      <th>C</th>
      <td>55</td>
      <td>80</td>
      <td>84</td>
      <td>100</td>
    </tr>
    <tr>
      <th>D</th>
      <td>70</td>
      <td>95</td>
      <td>99</td>
      <td>115</td>
    </tr>
    <tr>
      <th>E</th>
      <td>85</td>
      <td>110</td>
      <td>114</td>
      <td>130</td>
    </tr>
    <tr>
      <th>F</th>
      <td>100</td>
      <td>125</td>
      <td>129</td>
      <td>145</td>
    </tr>
    <tr>
      <th>G</th>
      <td>115</td>
      <td>140</td>
      <td>144</td>
      <td>160</td>
    </tr>
  </tbody>
</table>

<br />
<p>
  However, it is quite common for heat detectors to also have a rate-of-rise detection method. Detectors employing rate-of-rise detection conforming to the table below can, optionally, use the 'R' suffix with their classification, for example A1R.
</p>
<table class="technical-data" width="100%" cellspacing="0" cellpadding="0">
  <thead>
    <tr>
      <th rowspan="3" width="20%">Rate of rise of air temperature K min<sup>-1</sup> (from typical application temperature)</th>
      <th colspan="4">Class A1 Detectors</th>
      <th colspan="4">Class A2, B, C, D, E, F & G</th>
    </tr>
    <tr>
      <th colspan="2">Lower limit of response time</th>
      <th colspan="2">Upper limit of response time</th>
      <th colspan="2">Lower limit of response time</th>
      <th colspan="2">Upper limit of response time</th>
    </tr>
    <tr>
      <th>min</th>
      <th width="10%">s</th>
      <th>min</th>
      <th width="10%">s</th>
      <th>min</th>
      <th width="10%">s</th>
      <th>min</th>
      <th width="10%">s</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th>1</th>
      <td>29</td>
      <td>0</td>
      <td>40</td>
      <td>20</td>
      <td>29</td>
      <td>0</td>
      <td>46</td>
      <td>0</td>
    </tr>
    <tr>
      <th>3</th>
      <td>7</td>
      <td>13</td>
      <td>13</td>
      <td>40</td>
      <td>7</td>
      <td>13</td>
      <td>16</td>
      <td>0</td>
    </tr>
    <tr>
      <th>5</th>
      <td>4</td>
      <td>9</td>
      <td>8</td>
      <td>20</td>
      <td>4</td>
      <td>9</td>
      <td>10</td>
      <td>0</td>
    </tr>
    <tr>
      <th>10</th>
      <td>1</td>
      <td>0</td>
      <td>4</td>
      <td>20</td>
      <td>2</td>
      <td>0</td>
      <td>5</td>
      <td>30</td>
    </tr>
    <tr>
      <th>20</th>
      <td>–</td>
      <td>30</td>
      <td>2</td>
      <td>20</td>
      <td>1</td>
      <td>0</td>
      <td>3</td>
      <td>13</td>
    </tr>
    <tr>
      <th>30</th>
      <td>–</td>
      <td>20</td>
      <td>1</td>
      <td>40</td>
      <td>–</td>
      <td>40</td>
      <td>2</td>
      <td>25</td>
    </tr>
  </tbody>
</table>

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