Technical Information
Cryogen Gas Specifications
CryoTech cryoanalgesic devices are designed to work
only with medical grade nitrous oxide (N20) or medical
grade carbon dioxide (CO2). A “Certificate of
Conformance” is available from your medical gas
supplier. The gas cylinders must be fitted with
non-siphon valves.
The minimum recommended purity assay for medical
grade nitrous oxide is 99.0% with limits to other
contents as shown below in a typical “Certificate of
Conformance” format:
| Test |
 |
Nitrous Oxide USP Limits |
| Identification |
|
Passes test |
| Carbon Dioxide |
|
0.03% |
| Carbon Monoxide |
|
10 ppm |
| Halogens |
|
1 ppm |
| Nitric Oxide |
|
1 ppm |
| Nitrogen Dioxide |
|
1 ppm |
| Ammonia |
|
0.0025% |
| Water |
|
150 mg/M3 |
| Air |
|
1.0% |
| Assay |
|
99.0% |
|
