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5tN[ by tMCo'v 11-24-98 3 01PM EMCON SACRAMENTO- # 6/ 6 1-209-226-7280 PTS Hr'G 8 9 IPF'-Y 2?4 POG NOV 24 '98 16 10 a IF I fII 1 AMS Dual Valve Liquid Sampler The AMS Dual valve DisCret�3 Liquid Sampler is designed to retrieve subsurface liquid samplesith a mini-mal amount of contact between rluld sample and gas orf t inside of the sample chamber_ The discrete liquid sampler csists of a Cylinder that is capped off on both ends. The iasidvolume of the cylinder :s the sample chamber. The top and thbottom caps hava valves that open and C1030 in unison. The valv s are activated by a electric solenoid. The operation of the AMS IDiscxete Liquid Sampler Is as follows. The sampler is lowered tothedepth at which a samDle is desired and the soleaold to activIted opening the top and bottom valves. Fluid enters the sample chamber through the button valy& which displaces any gas or air i side of the sample chamber. The gas or air inside Of the samplechamber exits through the upper valve. When the sample chamber is 1full the solenoid is deactivated and the sampler is returned to tte surface. When the 2ampl.er has been returned to the surface an emptying valve is attached to the lower end Of the sampler and the liquid sample is transferred to u $hipping or storage container. The use of the dual valves *tem minimlzes the possibility that the fluid being sampled will lie mixed with the gag or air inside the sample chamber. $ince the gas or air is allowed to escape through the upper valve �nd the fluid enters through the bottom only the upper aurface of the fluid inside of the sample chamber is exposed tko the gas or air inside of the sample Chamber. The amount of ai.r exposed liquid inside th chamber can be further reduced by allowing the valves to re in open for a period of time after the chamber is full of liquid. Durinq the tin® Interval that the valves are open thv expOsel fluid will diffuse out of the chamber through the upper valve because a velocity gratdiont has already been initiated toward the Aper valve port. In the accompanying figure ' (a) is the sampler in sampling position with the valves closed, and in (b) the valves are oven and fluid iS entering the chamber through the bottom valve While gas or air 0X1tS the chamber through the top port. In (c) the valves have been closed and in (d) the ampler has been retrieved, the emptying valve attached to the lower end and the fluid is being discharged. 1 I i i f i f i