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.

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Elitech Freon Leak Detector Halogen Refrigerant Gas Leak Detector HVAC Tester AC Sniffer R22 R410A R134A 1234YF, WJL-6000S

Product ID: 25200165

Details

Alarm
Audible Visual
Brand
Elitech
Color
WJL-6000
Item Weight
7.2 ounces
Operating Humidity
95 percent
Power Source
Battery

🎯7 adjustable sensitivity levels down to 0.21oz/yr

🔔Dual audible & visual leak and battery indicators

🛠️7.9-inch flexible probe for hard-to-reach leaks

KD 12.50

Duties & taxes included

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Description

🔍 Elitech WJL-6000S: Leak detection that works as fast and smart as you do.

ACCESS THE IMPOSSIBLE - 7.9-inch flexible probe reaches tight, hidden spots other detectors can’t touch—never miss a leak again.
STAY INFORMED STAY AHEAD - Dual audible and visual alarms plus battery indicators keep you in control and confident on every inspection.
RAPID RESPONSE ZERO DOWNTIME - Starts detecting leaks within 3 seconds and warms up in just 6 seconds—get to work faster than ever.
CUSTOMIZABLE SENSITIVITY FOR EVERY JOB - 7 sensitivity settings let you pinpoint leaks as small as 0.21oz/year—perfect for professional HVAC diagnostics.
PRECISION LEAK DETECTION AT YOUR FINGERTIPS - Detects all halogenated refrigerants including R22, R410A, R134A, and 1234YF with unmatched accuracy.

The Elitech WJL-6000S is a professional-grade halogen refrigerant leak detector designed for HVAC technicians and managers who demand precision and speed. It supports all common refrigerants including R22, R410A, and 1234YF, offers 7 adjustable sensitivity levels down to 0.21oz/year, and features a 7.9-inch flexible probe for hard-to-reach areas. With rapid 3-second response time, dual audible and visual alarms, and battery status indicators, it ensures reliable, efficient leak detection to keep your systems running flawlessly.

Specifications

ASIN	B015FK1EH2
Alarm	Audible, Visual
Best Sellers Rank	#10,385 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Gas Detectors & Alarms
Brand	Elitech
Color	WJL-6000
Customer Reviews	4.2 4.2 out of 5 stars (5,340)
Enclosure Material	Metal, Plastic, Rubber
Item Dimensions D x W x H	1.37"D x 1.37"W x 5.9"H
Item Weight	7.2 ounces
Manufacturer	Elitech
Mfr Part Number	WJL-6000
Model Number	WJL-6000
Number of Items	1
Operating Humidity	95 percent
Power Source	Battery Powered
Product Style	modern
Sensor Type	Ionization
UPC	705911761681 841161102970 841161102918
Unit Count	1 Count
Upper Temperature Rating	52 °C

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