Heated diode refrigerant leak detector

Does anyone know where to buy the sensing element for the heated diode refrigerant leak detectors?

These are sensors that triggers on CFCs, HFCs, HCFCs and blends. Thanks!

Googling "CFC detector" gives hits for various vendor sites.

I found a lot of portable detectors, but I'm looking around for just the sensing element - I want to play around with it a bit!

With a Google of refrigerant detector sensor I can turn a few sensors but I can't turn and data sheets. I did find these guys : https://www.bacharach-inc.com/index.htm who look to make sensors like this one: https://www.supplyhouse.com/Bacharach-3015-0486-Replacement-Refrigerant-Sensor but I can't find the sensor on their website. I figure it this way, they are located in PA so I would just give them a call, most refrigeration engineers are nice guys and if you can get one on the phone maybe they can point you to some sensors and data sheets.

Ron

Many gas detectors are not specific and you don;t need them for leak detection. I have a very old Matheson unit that detect just about anything.

In reality, you typically use the self-heating effect of a fast response thermister with a reasonably well controlled flow rate. You "calibrate" in the current environment so the beeping/blinking is just off.

Once you add a much higher conductivity gas to the air stream, the thermister heats up.

So, think of a constant power circuit to a thermister, and constant airflow. Now look at the small change in resistance when a higher conductivity gas is added.

This https://www.thermopedia.com/content/853/ might help, but you really want velocity to remain constant.

https://en.wikipedia.org/wiki/Thermal_conductivity_detector

This https://www.google.com/url?sa=t&rct...ATodBUOByPcTKBA&bvm=bv.83339334,d.eXY&cad=rja link does a better job.

You could flag down a Snap-On tool truck and order a replacement sensor for the unit they sell.