當被測介質使用流量計的丈量管線傳送到變送器時，由于空氣中的冷分子太兇猛常常會把丈量管線凍住、分出結晶等表象直接影響到外表丈量顯現的準確性。外表工查看應調查外表保溫情況，查看安裝在工藝設備與管線上的外表，如橢圓齒輪流量計、電磁流量計、磁翻板液位計（渦街流量計）、渦輪流量計、質量流量計、法蘭式差壓變送器、浮筒液位計和調節閥閥等保溫情況，調查保溫材料有否掉落，有否被雨水打濕形成保溫材料不起作用。
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 meter flange 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.
（責任編輯：）
