22B-D012N104
22B-D012N104
22B-D012N104
为了保证电磁流量计在故障修复后以及长期使用后的精度和可靠性,而又不影响日常生产,下面介绍几点在线校准方法。
1.对电磁流量计励磁线圈进行安全绝缘测试,应大于20MΩ。
2.对电磁流量计励磁线圈进行铜电阻测试,应与原出厂值相同(环境温度相同时)。
3.对电磁流量计传感器电极对地电阻进行测试,若电阻值在2一20kf之间,并伴有充放电现象,两只电极的电阻相近,则认为好的。
4.对电磁流量计转换器励磁电流进行测试,观察其输出与转换器原电流的值,误差不过士0. 25mA 。
5.对电磁流量计转换器模拟量输出及频率输出进行测试,观察其线性变化情况,并计算其大线性误差,应不过士0.5%。
6.对DN 1200mm以上的电磁流量计,应测试推动级NB,电流误差不过12mA。
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