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CO2 TIME CHARGE GRAPHS
These guides will save you hundreds of dollars in wasted CO2.
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Use This Chart To Determine Tank Cycle Capacity
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CO2 Flow
In Cubic Feet
Per Hour |
Release Time In Minutes Per Hour
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1 Min
|
2 Min
|
4 Min
|
6 Min
|
8 Min
|
10 Min
|
12 Min |
| 10 CFH |
52.45
|
26.22
|
13.11
|
8.74
|
6.56
|
5.24
|
4.37
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| 15 CFH |
34.96
|
17.48
|
8.74
|
5.83
|
4.37
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3.50
|
2.91
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| 20 CFH |
26.22
|
13.11
|
6.56
|
4.37
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3.28
|
2.62
|
2.19
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| 25 CFH |
20.98
|
10.49
|
5.24
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3.50
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2.62
|
2.10
|
1.75
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| 30 CFH |
17.48
|
8.74
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4.37
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2.91
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2.19
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1.75
|
1.46
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Select the CO2 flow rate and minutes of operation that will give you the proper ppm of CO2 for your growing area. Next, find the value that corresponds to these two settings in the Carbon Dioxide Tank Cycles Chart and multiply that number by your tank size.
Example: From the Carbon Dioxide Flow Chart for Emitter Systems you determine that you need 15 cubic feet per hour of Co2 at 6 minutes of “on” time. From the chart above the cross reference for these settings is a factor of 5.83. To determine the maximum number of cycles your tank will accommodate, multiply your tank weight* by 5.83. If you have a 20lb tank the total number of cycles possible from a full tank would be 117 (20 x 5.83).
* Tank weight refers to the actual weight of liquid Co2 in the cylinder and not the weight of the empty tank. A standard 20lb. tank therefore, has 20 pounds of liquid Co2 in the cylinder. 20 lbs is equal to 180 cu. ft. of CO2. Some standard tank sizes are 10, 20, 35 and 50 pounds. Even, if you do not have a standard size tank, this method will work to determine the maximum number of cycles possible.
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To Raise Ambiant Carbon Dioxide Levels
to a Level of 1000 Parts Per Million (PPM)
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10 CFH |
15 CFH |
20 CFH |
25 CFH |
30 CFH |
Cubic Feet
of Growing
Area |
CO2 Flow In Cubic Feet Per Hour
Release Time In Minutes
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| 400 |
2.4
|
1.6
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1.2
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0.9
|
0.8
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| 600 |
3.6
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2.4
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1.8
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1.4
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1.2
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| 800 |
4.8
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3.2
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2.4
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1.9
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1.6
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| 1000 |
6.0
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4.0
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3.0
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2.4
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2.0
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| 1200 |
7.2
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4.8
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3.6
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2.9
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2.4
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| 1400 |
8.4
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5.6
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4.2
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3.4
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2.8
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| 1600 |
9.6
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6.4
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4.8
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3.8
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3.2
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| 1800 |
10.8
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7.2
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5.4
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4.3
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3.6
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| 2000 |
13.0
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8.0
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6.0
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4.8
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4.0
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A. Total cubic ft. of the enclosure as determined by the formula (L x W x H)
B. Rate of flow as started on the emitter regulator
C. The time it takes to charge the enclosure expressed in minutes. |
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To Raise Ambiant Carbon Dioxide Levels
to a Level of 1500 Parts Per Million (PPM)
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10 CFH |
15 CFH |
20 CFH |
25 CFH |
30 CFH |
Cubic Feet
of Growing
Area |
CO2 Flow In Cubic Feet Per Hour
Release Time In Minutes
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| 400 |
3.6
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2.4
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1.8
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1.4
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1.2
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| 600 |
5.4
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3.6
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2.7
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2.1
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1.8
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| 800 |
7.2
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4.8
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3.6
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2.9
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2.4
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| 1000 |
9.0
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6.0
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4.5
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3.6
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3.0
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| 1200 |
10.8
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7.2
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5.4
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4.4
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3.6
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| 1400 |
12.6
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8.4
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6.3
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5.1
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4.2
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| 1600 |
14.4
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9.6
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7.2
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5.7
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4.8
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| 1800 |
16.2
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10.8
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8.1
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6.5
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5.4
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| 2000 |
19.5
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12.0
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9.0
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7.2
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6.0
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A. Total cubic ft. of the enclosure as determined by the formula (L x W x H)
B. Rate of flow as started on the emitter regulator
C. The time it takes to charge the enclosure expressed in minutes. |
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Tank Sizes
CO2 tanks come in 10 and 20 lb sizes. The tank is rated by the weight of the gas the tank will hold. There is approximately 9 cu.ft. in a pound of CO2, so a 10 lb tank holds 90 cu.ft. of CO2.
Equivalents
1% CO2 equals 10,000 ppm |
