| 摘要 |
<p>The invention relates to a monitoring method according to which changes in external conditions, such as temperature, humidity and existance of gases, particles and water, are detected and monitored by at least two detectors (10) connected to a central unit (21), said detectors (10) comprising measuring units (18, 19, 20), and an alarm is triggered in said central unit (21) when adjustable levels of said changes have been recorded in said central unit (21). Said measuring units (18, 19, 20) are connected in parallel to said central unit (21), and said measuring units (18, 19, 20) transmit to said central unit (21) voltage signals of pre-determined strengths when pre-determined levels of changes have occurred.</p> |
