Process for making impedance measuring module

An injection molding process for making a plastic impedance module having a generally flat metal grid imbedded therein with a plurality of pairs of electrodes upstanding generally perpendicularly from said grid, one pair into each of a plurality of chambers, said electrodes being uncoated by plastic, comprising:

• placing said grid adjacent a first mold half of an injection mold with said electrodes inserted each within a respective one of a plurality of slots, each of said slots being within a top end of a rod movable within a hole generally perpendicularly to a first generally flat portion defining a top of a base of said module, said first mold half having a plurality of channels extending from said first portion into said first mold half defining said plurality of chambers;
• propelling together said first mold half and a second mold half having a second generally flat portion for forming said injection mold, pin means extending from said first and second generally flat portions of said first and second mold halves supportingly contacting said grid on both sides thereof;
• injecting plastic into said mold to form said module with all of said grid other than the points of contact of said pins on both sides of said grid and said electrodes thereby forming said module;
• and
• removing said module from said mold.