Ammonium nitrate analysis and control

Claim 1

APPARATUS FOR CONTINUOUSLY DETECTING THE CONCENTRATION OF A CONSTITUENT IN A SAMPLE OF A SOLUTION HAVING A CLOUD OF FUDGE POINT THATIS CHARACTERISTIC OF SAID CONCENTRATON, SAID POINT THAT IS CHARACTERISTIC OF SAID CONCENTIES ONE OF WHICH IS A TEMPERATURE THAT IS CHARACTERISTIC OF SAID POINT FOR A CONCENTRATION WHEN AT LEAST ONE OTHER PROPERTY REPRESENTATIVE OF SAID POINT IS KNOWN, AND COMPRISING: A CELL FOR CONTAINING SAID SAMPLE, MEANS TO CONTINUOUSLY WITHDRAW FROM A BODY OF SAID SOLUTION A SAMPLE HAVING AN UNKNOWN CONCENTRATION OF SAID CONSTITUENT AND TO CONTINUOUSLY PASS SAID SAMPLE THROUGH SAID CELL, MEANS TO EXCHANGE HEAT WITH THE FLUID PASSED THROUGH SAID CELL, MEANS TO CONTINUOUSLY PASS A BEAM OF RADIATION THROUGH SAID CELL, MEANS TO CONTINUOUSLY MEASURE THE RADIATION TRANSMITTED THROUGH SAID CELL, MEANS CONTINUOUSLY RESPONSIVE TO SAID BEAM TO ADJUST SAID MEANS TO EXCHANGE HEAT SO THAT THE SAMPLE STREAM PASSED THROUGH SAID CELL IS MAINTAINED AT APPROXIMATELY THE FUDGE POINT THEREOF, AND MEANS TO MEASURE THE TEMPERATURE OF SAID SAMPLE STREAM IN SAID CELL WHEREBY THE CONCENTRATION OF AQUEOUS AMMONIUM NITRATE IS DETERMINED BY THE TEMPERATURE MEASURED.