when the tested medium pressure P act to the film, the film bring dirtortion, the pressure of the seal liquid nearly same with medium pressure, whhen the rigidity of film too small to the medium. The film pressure meter main mainly petrol, alkali, chemical fiber, medicine, food process. It is composed by normal pressure meter and joint and separator.The test medium is strong corrupt, high temperature, high adhibit,easy crystal, easy freeze or have unsolved solid.
二、工作原理示意圖 Work functional picture
隔膜表液位差 尤其對于帶軟連接管的隔膜壓力表,由于受壓部與通用型壓力表安裝位置不同,會(huì)產(chǎn)生如下圖所示的液位差的影響量△P。 Film liquid potential difference Escpecially the film pressure meter with the tube,because the location to set,will have generrate the effect,the liquid potential difference is △P.
三、法蘭的選擇 Flange selection
根據(jù)GB(中國)、HGJ(化工部)、DIN(德國)、JIS(日本)、SNSI(美國)等法蘭標(biāo)準(zhǔn)以及國內(nèi)實(shí)際使用情況編制成常用的法蘭系列標(biāo)準(zhǔn),供用戶選擇。特殊規(guī)格可定制。 According GB(china)、HGJ(Chinese chemical department),DIN(German)、JIS(Japanese)、SNSI(America), the customer can be select any standard,and also order the special standard products.
四、隔膜式壓力表連接示意圖 The joint sketch for film pressure meter
五、型號表示 Model express
六、隔膜表的溫度影響 Film meter temperature infection
隔膜壓力表其溫度的影響量與密封液膨脹系數(shù)隔膜剛度及受壓部位的溫度有關(guān)。儀表在使用溫度偏離20±5℃時(shí),受溫度影響的示值變化率剛性不夫于0.1%℃,柔性(遠(yuǎn)接式)不大于0.1±0.25%℃(L-傳壓導(dǎo)管長度M,)隔膜式壓力表在制做時(shí)應(yīng)注意根據(jù)不同的使用環(huán)境,選擇相適應(yīng)的密封工作液。 The film pressure meter error by temperature must concern with seal liquid expand coefficient, film rigidity, and temperature of pressure body.When the temperature difference 20±5℃, the error will not high 0.1%℃ , flexible (long distance joint) will not pass 0.1±0.25%℃, the film pressure meter should select seal liquid by different work environment.
七、隔膜表的溫度影響 The infeetion in the temperature of film meter
為保證隔膜表使用可靠性和安全性,應(yīng)根據(jù)不同用途選擇合適的密封液。 To protect the security and stable of film meter, should select some kinds right airproof liquate.