Calibrate CO₂ flow

The regulatorDrops the cylinder's pressure (about 60 bar when full) to a working pressure, about 1 bar here. Its flathead screw fully anti-clockwise is closed. was checked at 1 bar in Set up the CO₂ flow test.

1. Record how long the CO₂ takes to fill the measuring cylinder.
2. Calculate the flow rate.
3. Adjust the needle valveA fine-adjustment valve on the solenoid's front port. It sets how fast CO₂ flows; turn clockwise to close., and repeat until you reach the target flow rate.

Shutting the gas off after a session

1. Turn the regulator anti-clockwise until its screw hangs loose: it is then fully off.
2. Close the adapter’s pin.
3. Turn the solenoid overrideThe dial on the front of the solenoid. 0 is normal (closed without power); 1 holds the valve open. to 1 to vent the line to zero, then back to 0.

Parts

• 1×CO₂ needle valveearlier step

Check your work

1. How does the measured flow rate compare with your target?

   • On target, within your tolerance
   • Above target, beyond your tolerance
   • Below target, beyond your tolerance
   Show the answer

   Answer: On target, within your tolerance

   • If you see Above target, beyond your tolerance: Close the needle valveA fine-adjustment valve on the solenoid's front port. It sets how fast CO₂ flows; turn clockwise to close. a little (clockwise), and repeat the measurement until it matches.
   • If you see Below target, beyond your tolerance: Open the needle valve a little (anti-clockwise), and repeat the measurement until it matches.

≈ 0.02 g CO₂e per view