A leak detector's specification sheet gives a sensitivity figure stated as a weight of refrigerant per year. What does that figure describe about the instrument?
Correct Answer
B) The smallest continuous leak the instrument is able to sense
Sensitivity for a leak detector is expressed as the smallest leak rate it can pick up, written as a weight of refrigerant lost over a year, such as a fraction of an ounce per year. A smaller number means a more sensitive instrument. It is the figure to compare when choosing a detector for a job where a slow loss over a season is the problem, since a detector that cannot sense that rate will report a system tight.
Why This Is the Correct Answer
The rating states the smallest continuous leak the detector can detect, expressed as a weight of refrigerant escaping per year. A lower figure is better because it means the instrument responds to a smaller loss. Comparing instruments on that number is what tells a technician whether a detector is capable of finding the slow seasonal loss that is actually being investigated.
Why the Other Options Are Wrong
Option A: The largest leak the instrument can measure before it saturates
Detectors are not chosen by how large a leak they can handle. A large leak is found by almost any method, including soap solution and an oil trace.
Option C: The amount of refrigerant the instrument consumes while sampling
Sampling instruments draw only a trace of air across the sensor. Nothing in the rating describes refrigerant consumed by the instrument itself.
Option D: The rate at which the sensing element must be replaced each year
Element life is a separate specification given in hours of operation. The sensitivity figure describes detection capability, not maintenance intervals.
Memory Technique
Think of it as hearing. A smaller number means the instrument hears a quieter leak.
Reference Hint
Leak detector sensitivity is stated as the smallest leak rate detectable, in weight of refrigerant per year.
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