Harris HP742 CGA 320 CO2 Regulator
The Harris HP742 is a two-stage stainless steel regulator with a CGA 320 inlet for carbon dioxide (CO2). Its 316L stainless steel body and diaphragm suit grade 6.0 gases and applications where either the internal gas or the external environment is harsh or corrosive. See all models in our Stainless Steel Regulators.
Gas service: CGA 320
CGA 320 is the standard connection for carbon dioxide cylinders. It seals with a flat washer, so replace the washer at every cylinder change and leak-test with soap solution. CO2 cools sharply as it expands: below about 60 psig delivery it can form dry-ice snow inside the regulator, while frost on the outside is only moisture from the air. For high, continuous CO2 flow, ask us about the Harris HP705 electrically heated regulator.
Choose the Harris HP742 for CO2 in harsh conditions, around corrosive vapors, or for CO2 mixtures with corrosive components. Setting up a cell culture incubator? See our ready-to-connect CO2 incubator regulator and the two-cylinder CO2 manifold.
Specifications
- Two-stage design, 316L stainless steel barstock body and fittings
- Bonnet: nickel-plated brass barstock
- 1-11/16″ 316L stainless steel diaphragm
- High purity PTFE seals and valve seats; seat protected by a 10 micron sintered stainless steel inlet filter
- Inboard helium leak rate 1×10-9 cc/sec
- 2″ dual-scale stainless steel gauges (psi/bar)
- Outlet pressure: selectable 0-15, 0-50, 0-125 or 0-250 psig (choose above); the 0-125 psig range has a 30″Hg vacuum to 200 psi outlet gauge
- Maximum inlet pressure 3000 psig
- Flow coefficient Cv 0.06; delivery changes only about 0.05 psig per 100 psig drop in cylinder pressure
- Purity: grade 6.0 (99.9999%) and higher, plus corrosive gases
- Pipe thread outlet port (FNPT) with outlet valve included: 1/4″ FNPT diaphragm valve
- Relief valve is not standard on the HP742 (Harris option 4); ask us if your system needs one
Typical applications
- Corrosive gases, or corrosive and harsh external environments
- Grade 6.0 research gas, process analyzers and gas chromatography
- EPA protocol, laser gas and emissions monitoring
This high purity regulator can be used in lab settings or in harsh conditions.
What’s included
- Harris HP742 two-stage regulator with CGA 320 inlet
- 2″ dual-scale stainless steel gauges
- Outlet valve included: 1/4″ FNPT diaphragm valve
- Use a new CGA 320 washer at each cylinder change
Other ranges and models
Choose your outlet pressure from the Outlet Pressure dropdown above: 0-15, 0-50, 0-125 or 0-250 psig. The 0-125 psig range covers most laboratory delivery pressures. Need a different range? Contact us for a quote.
Compare the same CGA 320 connection in other Harris series:
- Harris GP402 (economy, up to grade 4.0), CGA 320
- Harris HP702 (high purity, up to grade 5.0), CGA 320
- Harris HP722C (ultra high purity, grade 5.0), CGA 320
Not sure this is the right regulator? Read our Regulator Buying Guide, check the CGA Charts, or call 1-888-641-2267 and our team will match the regulator to your application.
