An online form must be submitted with your request and mole fraction per tank request.
CO2 tanks can be filled and calibrated in the range of 300 to 800 ppm.
The number of cylinders requested must be equivalent to those returned empty.
The target CO2 is usually within 5 umol/mol near ambient concentration. Values will vary at either end of the range as well as with the addition of another gas like methane.
Turnaround time for CO2 cylinder fills and calibration is 4 to 6 weeks. Cylinders with CO2 and CH4 may require additional time for filling and calibration. Please consider this lead-time when making request for tank fills.