User Manual

ISP-074-575-P1D 69

5. To close the gas bag valve, turn the knurled plastic knob counter-

clockwise to unlock it. Gently pull the valve tube up to close the valve.

Turn the knurled plastic knob clockwise to tighten it against the valve

tube.

Once the bag has been filled, use the bag and sample as soon as possible.

NOTE: Do not use gas bags to sample unstable or highly reactive compounds. Do not use

Tedlar® bags for storage of hazardous materials.

Figure 24. Using the Gas Bag

Calibrating the 2020ComboPRO with a Gas Bag

1. Ensure the short sample probe is connected to the 2020ComboPRO inlet. If

you are using the long probe for sampling, then ensure the long probe is

connected to the 2020ComboPRO.

NOTE: Ensure the sample probe is free of any contamination as this will affect the

calibration

2. Press the CAL key.

3. Follow the instructions on the display and connect the 2020ComboPRO to

zero air sample bag or leave the instrument unconnected so it can sample

clean ambient air. Then press the “Next” key. The 2020ComboPRO will

take 60-90 seconds to set the zero point for calibration.

Locking Ring

Tube Stub

Gas Bag Valve

Injection Port

Septum Retainer

Replacing the Septum

Remove retainer and

replace silicone septum.

Place septum with

Teflon side down.

Replace retainer

Do not overtighten.

Overtightening may result

in needle blocakge

Replace septum after

5-10 injections.To replace

septum, turn retainer counter-

clockwise. For replacement

septa order Teflon bonded to

Silcone, diameter = .375" (9.5 mm)