Nitrox mixes

Here are the maximum operational depths (MOD) in metres for various Nitrox mixes and oxygen allowances.

fO2	1.3	1.4	1.5	1.6
21%	52	57	61	66
22%	49	54	58	63
23%	47	51	55	60
24%	44	48	53	57
25%	42	46	50	54
26%	40	44	48	52
27%	38	42	46	49
28%	36	40	44	47
29%	35	38	42	45
30%	33	37	40	43
31%	32	35	38	42
32%	31	34	37	40
33%	29	32	35	38
34%	28	31	34	37
35%	27	30	33	36
36%	26	29	32	34
37%	25	28	31	33
38%	24	27	29	32
39%	23	26	28	31
40%	23	25	28	30

A rough formula is given by:

Depth = ( ( Oxygen Allowance * 10) / Oxygen ratio ) - 10

eg. for Allowance of 1.4 and a Oxygen conc of 32%

Depth = ( (1.4 * 10) / 0.32) - 10

Depth = (14 / 0.32) - 10

Depth = 43.75 - 10

Depth = 33.75m