Note:     The above comparisons are based upon the following premises:

1. A 58 liter cylinder of four gas mixture containing hydrogen sulfide at a cost of $265.00 (with the initial cost to also include $126.00 regulator).
2. A 103 liter cylinder of three gas mixture which does not contain hydrgoen sulfide at a cost of $144.00 (with the initial cost to also include $126.00 regulator).
3. An ACD Cal 2000 generator and hydrogen sulfide cell at a cost of $2200.00 (0.5 LPM flow) with a cell replacement cost of $600.00.
4. The "Total cost per minute of calibration (with all new equipment)" is based on the cost of a four gas cylinder and regulator compared to the cost of a three gas cylinder and regulator plus the cost of a Cal 2000 generator and a Cal 2000 hydrogen sulfide cell.
5. The "Total cost per minute of calibration (with existing regulator or Cal 2000 instrument)" is based on the cost of a replacement four gas cylinder compared to the replacement cost of a Cal 2000 hydrgoen sulfide cell.  This total assumes the user is either using a previously purchased regulator and/or is using a previously purchased Cal 2000 instrument.