Influence of Temperature on the Inter-pressure of Soil Water Tension with Correcting Method

When the electronic temperature sensor was incorporated into a system of soil water tension and the insidetube temperature was monitored in real time, it is concluded that the inside temperature increased by 26.9 ℃ and the inside pressure changed about 14.6 Kpa, when the pottery soil was replaced by the sealing plug. When the soil water was relatively stable in the experimental salvers, the in-side pressure stil varied regularly with the temperature. When the inside temperature increased by 22.2 ℃, the inside pressure varied about 7.4 Kpa. Through com-pensation calculation of the inside tension, the temperature in the warming and cooling periods was compensated, which was useful to correct the tension measurement errors induced from the changing temperature. When the measuring interval was 4 hours and the temperature difference was 18.1 ℃, the tension difference of both points was only 0.278 Kpa, compared to the difference up to 6.5 Kpa before compensation.

介绍几种应用效果较好的仪器仪表(二)

YF100型旋涡流量计我们在氩气流量的测量中采用了一台,投运一年多,一直很稳定。最近又在空气流量测量中采用了三套,更显示出这种流量计的优越性。由于管网空气含水,含尘、含油量较大,加上维护管理不善,原来采用的孔板流量计没有一套能够准确、可靠计数,多年来一直估算分配。而旋涡流量计无取压系统,受外界条件变化影响小,计量准确稳定性好。由于我们装的流量系统没有压力补正,是根据使用中的平均压力修正的流量系数,如果采用压力补正系统,准确度将会更高。