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一、結構與用途 Structure and Use

當測量介質的壓力P作用于隔膜，則隔膜產生變形，壓縮壓力儀表測壓力系統(tǒng)的密封液，使其形成P-△P的壓力。當隔膜的剛性足夠小時，則△P也很小，壓力儀表測壓力系統(tǒng)形成的壓山就近于測量介質的壓力。
隔膜壓力表主要應用于石油化工、制堿、化纖、制藥、食品等上藝流程中，它是通用型壓力表與連接體和隔膜隔離器組成。在測量介質是強腐蝕、高溫、高粘度、易結晶，易凝固、有固體浮游物的情況下使用。

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，會產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)等法蘭標準以及國內實際使用情況編制成常用的法蘭系列標準，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。儀表在使用溫度偏離20±5℃時，受溫度影響的示值變化率剛性不夫于0.1%℃，柔性(遠接式)不大于0.1±0.25%℃(L-傳壓導管長度M，)隔膜式壓力表在制做時應注意根據(jù)不同的使用環(huán)境，選擇相適應的密封工作液。
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.

密封液 airproof liquate	受壓部溫度范圍 the temperature range in press	比重量 ratio weight (g/m3)	體膨脹系數(shù) ratio expａnd coefficient (1/℃)	用途 Use
高粘度硅油 high adhibit silicon oil	-10～200	1.07	0.95×10-3	高溫用 For high temperature
低粘度硅油 low adhibit silicon oil	-30～100	0.94	1.08×10-3	一般用 normal use
甘油水溶液 glycerin water liquate	-5～100	1.27	0.61×10-3	食用品 edible things
植物油 plant oil	-5～100	0.93	1.03×10-3	食用品 edible things
氟油 fuorin oil	-30～150	1.93	0.75×10-3	氫、氧 hydrogen,oxygen