Using the UL101, I found the major leak in less than an hour... I was able to check more than 60 or 70 sprinkler heads in one hour. Now I’m a hero, saving the school money and aggravation, due to the high cost and maintenance of our dry sprinkler system.
I checked and our compressor cycles are now 1 Hour 46 minutes compared to 5 minutes before finding the leaks with the UL101 and verifying repairs.