<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">求助:温湿度传感器的困惑</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">在做一个工厂温控项目,用到</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">S</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">牌的温湿度变送器</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">QFA65</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">测量室内温湿度,信号电缆为</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">4</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">×</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">0.5mm2</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">屏蔽质优品牌,测量距离约</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">150m</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">,电缆与其他工业电缆同行。在</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">150mm</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">外测量温度信号为</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">6</font></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">.22</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">VDC</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">(对应温度</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">31</font></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">.1</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">℃<span lang="EN-US">,</span>明显超大),湿度信号<span lang="EN-US">3.3VDC</span>(对应湿度<span lang="EN-US">33%</span>,晕了!);在现场断开外接线后测量温度信号</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">5</font></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">.58VDC</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">(对应温度</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">27</font></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">.9</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">℃)<span lang="EN-US">, </span>湿度信号<span lang="EN-US">4.2VDC</span>(对应湿度<span lang="EN-US">42%</span>);但实际温度为<span lang="EN-US">27.6</span>℃<span lang="EN-US">,</span>湿度<span lang="EN-US">70%;</span>最后改为输出为电流信号的温湿度变送器,测量温度为<span lang="EN-US">27.8</span>℃<span lang="EN-US">,</span>湿度<span lang="EN-US">71.5%,</span>准!<span lang="EN-US"><p></p></span></span></p><p></p><p></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt;">我晕了!!</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><p></p></span></p><p></p><p></p><p></p><p></p><p></p></span>
[此贴子已经被作者于2007-4-27 10:58:38编辑过]
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