Operating Principles

A Drop Tube Assembly allows samples to be obtained from greater depths then the standard maximum 100 ft (30 m) below grade for PVC Bladder Pumps. The Drop Tube places the screened filter intake of the Pump as deep as necessary to access the sample zone desired.

The Drop Tube Assembly is easily installed on existing Pumps, even in the field. Pumps are operated in the same manner as those without a Drop Tube, which maintains high sample integrity.

Installation

Select and cut the appropriate length of 1/2" OD x 3/8" ID tubing. The most common type of tubing used is low density polyethylene (LDPE).

Unscrew and remove the Filter Retainer (with the white Vyon filter) from the Bottom Platen of the Pump. Keep the Check Ball.

Remove the white Vyon filter from the Filter Retainer and slide it over the new Filter Retainer with the 7/8" thread.

Insert the Check Ball into the stem of the Top Drop Tube Extension.

Ensure there is a #V116 O-ring over the groove at the shoulder of the Top Drop Tube Extension, and tighten by hand into the Bottom Platen of the pump until the O-ring properly seats.

Push one end of the 1/2" OD x 3/8" ID tubing into the compression fitting on the bottom of the Top Drop Tube Extension.

Take the Bottom Drop Tube Extension and connect it to the other end of the tubing using the compression fitting.

Thread the Filter Retainer (with the white Vyon filter) into the bottom of the Bottom Drop Tube Extension, ensuring the O-ring on the Filter Retainer properly seats.

• Thread a weight, if required, into the thread on the bottom of the Filter Retainer to complete the installation.

• The Bladder Pump is operated in the same manner as those without a Drop Tube. See separate operating and pumping instructions. The entire Pump Body must be submerged when operating using a Drop Tube.