A professional who tends machine that freezes blood plasma preparatory to hydration or storage. Respnsibilities include:

• Starts machine that circulates solution of dry ice and alcohol over rollers to chill them.
• Moves blood plasma from walk-in freezer to freezing machine, using handtruck.
• Places bottles of blood plasma onto rotating rollers submerged in cold alcohol in machine.
• Taps revolving bottles with metal wand to accelerate and ensure uniform freezing of plasma, increasing speed of tapping on bottles when crystallization does not occur uniformly.
• Places bottles of plasma that do not freeze uniformly into reject container and frozen plasma on trays for further processing.
• Reads thermometer to ascertain that temperature of solution remains constant, according to specifications.
• May place bottles on rack to drain off alcohol before packing.
• May tend centrifuge machine that separates plasma from red corpuscles present in whole blood.
• May tend fractionator machine that breaks down plasma into proteins by centrifugal action.