Patent ID: 8056360

Claim:
An automatic protective controller circuit for a single pressure absorption refrigeration cooling unit, comprising: (a) one or more temperature sensors in thermal contact with a portable single pressure absorption cooling unit containing an absorption cycle using a pump tube with a percolator effect for transport of refrigerant fluids, wherein the pump tube is surrounded by a weak solution of refrigerant, wherein the weak solution comprises water and an inhibitor depleted of ammonia, wherein each temperature sensor is located at a point along the weak solution flow, wherein the weak solution has a temperature, and wherein each temperature sensor measures the temperature of the weak solution along the weak solution flow at the point on the cooling unit at which the sensor is located; (b) electrical circuitry that compares the measured temperature of the weak solution at each point to a predetermined value for that point; and (c) one or more actuators that reduce heat input to the single pressure absorption refrigeration cooling unit; wherein the electrical circuitry activates the one or more actuators based on the comparison between the measured temperatures and the predetermined values, and if the measured temperature at any point along the weak solution flow is greater than the predetermined value for that point, then the one or more actuators is activated; wherein heat input to the cooling unit is adjusted based on measured temperature increase of the weak solution due to off-level tilting condition resulting cessation of refrigerant flow, to protect the cooling unit from excessive thermal stress caused by off-level tilting.