当被测介质使用流量计的丈量管线传送到变送器时，由于空气中的冷分子太凶猛常常会把丈量管线冻住、分出结晶等表象直接影响到外表丈量显现的准确性。外表工查看应调查外表保温情况，查看安装在工艺设备与管线上的外表，如椭圆齿轮流量计、电磁流量计、磁翻板液位计（涡街流量计）、涡轮流量计、质量流量计、法兰式差压变送器、浮筒液位计和调节阀阀等保温情况，调查保温材料有否掉落，有否被雨水打湿形成保温材料不起作用。
when measured media the flowmeter measurement line sent to the transmitter, due to the cold air molecules too ferocious will often dd pipeline frozen separation of crystalline appearance directly affect the accuracy of the apparent appearance in dd.instrument workers view the appearance of insulation should investigate the situation, the view in the process equipment and pipelines on the appearance, such as oval gear flow meter, electromagnetic flow meters, magnetic level gauge （vortex flowmeter）, turbine flowmeter, mass flow meterflange differential pressure transmitter, float level gauge and adjust valve insulation to investigate thermal insulation material has to drop, whether rain formation of insulation material does not work.（责任编辑：）