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一、引言椭圆齿轮流量计是一种高精度的容积式计量仪表。由于其使用现场一般都存在可燃性气体、蒸汽与空气的爆炸性混合物,因此要求流量计应具有防爆的性能。椭圆齿轮流量计通常采用电脉冲发信器,因而必须采取相应的防爆措施,当与二次仪表联接时,还要采用齐纳安全栅进行隔离。这样的防爆型流量检测系统是比较复杂的。本文介绍两种新型的光纤脉冲发信器,由于具有光纤传感器的电绝缘特性,用于现场不会产生引爆的电火花,其防爆性能十分良好。
I. Introduction Oval gear flowmeter is a high-precision volumetric meter. Because of its use of the scene are generally flammable gas, steam and air explosive mixture, it is required that the flow meter should have explosion-proof performance. Elliptic gear flowmeter usually using pulse transmitter, and therefore must take the appropriate explosion-proof measures, when coupled with the secondary instrument, but also the use of zener isolation barrier. This explosion-proof flow detection system is more complicated. This article describes two new types of fiber-optic pulse transmitter, due to the optical fiber sensor with electrical insulation properties for the scene will not produce a detonation spark, its explosion-proof performance is very good.