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Technical Center

"FX-1000p-B

 Mixer Gap Adjustment"

Foxcroft Equipment and Service Co., Inc.

2101 Creek Road

Glen Moore, PA  19343  USA

610-942-2888

FAX 610-942-2769

email sales@foxcroft.com

Mixer Gap Adjustment

The gap between the bottom tips of the mixer (striker), and the floor of the sample cell must be checked and adjusted whenever any integral part of the sample cell has been replaced, such as the mixer motor, the copper ring, or the o-rings. Setting the gap must be done to prevent the mixing balls from getting jammed under the tips of the mixer, and/or coming out of the top of the cell through the sample water exit gap.  Intermittent mixer motor stopping or reversal can be a symptom of this problem.  These same symptoms can also be caused by a worn copper ring, where the wall thickness has diminished such that the mixing balls get jammed between the side of the mixer and the inside wall of the copper ring.  This latter condition would require replacement of the copper ring, in addition to the gap adjustment described here.

The easiest way to set the gap properly is to re-assemble the sample cell without the PVC balls.  Be sure to include the o-rings on the top and bottom of the copper ring when re-assembling.  Once assembled turn the mixer by hand until you can see the allen-head set-screw.  Loosen the set-screw, and push the mixer down until it touches the bottom of the cell.  Then lift it enough so that it no longer rubs the bottom of the cell when turned, and tighten the set-screw.  If the mixer is tight on the shaft, you may need to remove the mixer and motor assembly from the cell block, to get a better grip on the mixer, or you may be able to use a small flat-blade screwdriver to move the mixer up or down.  When the gap is set, you may re-assemble the cell with the mixing balls in place.