Specifications

Page 23

Attach the calibration gas bag 1/4” ID hose to the 1/4” Bloodhound inlet connector hose for at least 30 seconds

then connect the ½” ID hose from the bag to the 1/2” exhaust port The calibration gas is now being

recirculated from the exhaust port, through the bag, and into the sample port in a closed loop system. This

technique conserves calibration gas.

Monitor the chromatograph output using the gas charting software. The output should look something like the

CG output picture on page 24. Adjust the column temperature until the desired performance of the

chromatograph is achieved. Keep in mind that natural gas is mostly methane. If you increase the column

temperature too much, the C1 and C2 peaks will merge when raw natural gas is present. Set the injection

timing to capture the 5 or 7 part calibration gas peaks.

The Bloodhound can be calibrated using 5 part or 7 part calibration gas. The parts must be at least 0.75% in a

nitrogen balance. If the Bloodhound sees 5 peaks, it will calibrate using 5 parts. If the Bloodhound sees 7

peaks, it will be calibrated for 7 parts. The example on page 24 is for 7 part calibration gas.