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            <h1 id="inside_rnewtil">数显差压变送器的定期校准与零点/量程校验方法</h1>
            <div class="inside_rnewtime">更新时间：2025-08-26  &nbsp;&nbsp;点击次数：306次</div>
            <div class="inside_rnewcon"><div>　　<strong><a href="http://www.wohuayiqi.com/Products-25699821.html" target="_blank">数显差压变送器</a></strong>的定期校准与零点/量程校验是确保其测量准确性和可靠性的重要步骤。以下将详细介绍这些步骤和方法：</div><div>　　一、定期校准</div><div>　　1.校准频率：</div><div>　　根据厂商建议和实际使用情况，一般建议每6个月至1年进行一次校准。</div><div>　　校准频率也可根据使用环境和重要性来确定。</div><div>　　2.校准准备：</div><div>　　确认变送器处于&ldquo;状态在线&rdquo;，检查接线是否正确，确保设备性能稳定。</div><div>　　准备校准所需的工具和设备，如高精度标准压力源、万用表等。</div><div>　　选择一个稳定、无振动、无温度波动的环境进行校准。</div><div>　　3.校准步骤：</div><div>　　零点校准：在无差压输入（&Delta;P=0）时，调整零点调节螺钉或按钮，使输出信号为下限值（如4mA DC）。确保压力表的稳定性和准确性，并在调整时监测读数。</div><div>　　量程校准：施加满量程差压信号，调整量程调节螺钉或按钮，使输出信号为上限值（如20mA DC）。同样，需要确保压力表的稳定性和准确性，并在调整时监测读数。</div><div>　　线性度校验：施加25%、50%、75%量程差压信号，记录输出值，确保误差在允许范围内。</div><div>　　回差校验：缓慢增减差压至各校验点，记录输出值，确保回差符合要求。</div><div>　　4.校准后操作：</div><div>　　恢复工况，按顺序关闭标准压力源，打开平衡阀等，避免压力冲击，保护变送器。</div><div>　　保存校准参数，确保数据不会丢失。</div><div>　　记录校准时间、环境温度、压力源读数等信息。<br />&nbsp;</div><p align="center"><img src="https://img72.chem17.com/gxhpic_b78ce82c29/8975028d8e14767f18d78b6f70be0028e95bf968ebbaaf509d7a5b89367812db6a7215eb3d136178_800_800_5.png" width="400" height="400" align="middle" alt="" /></p><p>&nbsp;</p><div>　　二、零点/量程校验方法</div><div>　　1.零点校验：</div><div>　　关闭高低压侧截止阀，打开平衡阀，让两侧压力相等。</div><div>　　如果低压侧通大气（如测液位时），确保低压侧通风顺畅，高压侧也保持和大气一致的压力。</div><div>　　连接校准设备，进入校准菜单，选择零点校准，确认当前差压为0后执行校准。</div><div>　　校准完成后，使用万用表测量输出电流，确保稳定在4.00&plusmn;0.01mA（或根据具体设备要求确定）。</div><div>　　2.量程校验：</div><div>　　关闭平衡阀，打开高压侧截止阀，使用高精度压力源向高压侧加压至满量程值。</div><div>　　等压力稳定后，连接校准设备，进入校准菜单，选择量程校准，输入满量程值后执行校准。</div><div>　　校准完成后，检查变送器的输出是否与期望的满量程压力值相匹配。</div><div>　　三、注意事项</div><div>　　1.在进行校准和校验前，确保<strong>数显差压变送器</strong>处于稳定状态，避免影响结果。</div><div>　　2.使用高精度的校准设备和工具，以保证校准结果的准确性。</div><div>　　3.在调整零点校准和满量程校准时，需要缓慢调整旋钮或按钮，并等待读数稳定后再进行下一步操作。</div><div>　　4.遵循相关安全操作规程，确保个人安全和设备完整性。</div><div>　　数显差压变送器的定期校准与零点/量程校验是确保其准确性和可靠性的关键步骤。通过正确的校准和校验方法，可以保证变送器输出信号与实际压差值相匹配，提供可靠的流体系统监测和控制。</div><div id="imt-webext">&nbsp;</div></div>
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