The sensor seems not to work, how can I detect by myself?

Second application, first time it worked well, but now it beeps two times a second, yet doesn’t detect even a direct stream of r-22 vapor. ??

Does this detect the smell of Freon refrigerant etc.? Or does it alert you for a leak if it feels air blowing on the sensor? Thank you

I am currently a student at a local college working on my last semester of refrigeration and air conditioning technology, I have used this sensor to detect R-22 and R-134a leaks and verified it with a much more expensive sensor. It works for these two refrigerants and yes, it detects the gas not just air. I also use soap bubbles once I have verified the location of the leaks. Best $20.00 I ever spent.

Will this unit detect R421a?

The product packaging specifically indicates it will detect R134a, R410a, R12, R22 and R600a (and I've only used mine for R134a), but I'm guessing it'll work with pretty much any commonly used CFC-based refrigerant.

Brand	Elitech
Style	modern
Power Source	Battery Powered
Color	WJL-6000
Product Dimensions	1.37"D x 1.37"W x 5.9"H
Item Weight	7.2 ounces
Alarm	Audible, Visual
Operating Humidity	95 percent
Upper Temperature Rating	52 Degrees Celsius
Sensor Type	Ionization
Number of Items	1
Manufacturer	Elitech
UPC	705911761681 841161102970 841161102918
Item model number	WJL-6000
Batteries	4 Lithium Metal batteries required.
Is Discontinued By Manufacturer	No
Manufacturer Part Number	WJL-6000
OEM Part Number	WJL-6000
Voltage	220 Volts
Wattage	1.5 watts

WJL-6000

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