We have a number of Matheson 3420 Series high-purity type gas regulators. These are model 3423, rated for 400 psi inlet and 0-125 psi outlet. We used them in our laboratory for nitrogen, oxygen, etc. They've only been used indoors. We have them mounted to 8 x 13 inch aluminum panels with on/off valves, as shown in the photos.
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Matheson says they're suitable for chromatography with FID, FPD, PID, and others, with any detection limit, and ECD, ELCD/Hall down to 50 ppm.
Here's some more specs from Matheson:
Maximum flow rate (at 400 psig, N2): 2,400 scfh (1,175 liters/min)
Operating temperature: -15°F to 140°F
Porting: 1/4" NPT female
Porting configuration: 2 High, 2 Low
Made in USA
Matheson catalog price is $360. We'd like to get $120 each. Less if you buy more. I will ship them to you if you're not in the area.
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