- 1
- Indigo80 indicator
- 2
- Adapter for sampling tube (Vaisala item code 279473SP)
- 3
- Sampling tube (polyurethane or silicone), OD 6 mm (approx. 15/64 in)
- 4
- Section of Nafion membrane tube (moisture exchanger) for optimal condensation prevention. Recommended minimum length approx. 25 cm (10 in).
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- Short section of silicone or polyurethane tube. Nafion membrane tube is not recommended to be inserted through the incubator sampling port.
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- Incubator sampling port
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- Tube inserted into the measurement environment by approx. 5 cm (2 in)
- Position GMP80P higher than the incubator sampling port and leave a loose length of tube hanging between the probe and the incubator (see the figure above).
- Make sure the tube is inserted fully (by approx. 5 cm (2 in)) into the measurement environment.
- Vaisala recommends using a Nafion membrane tube for sampling to maximize transfer of water vapor from the sample to ambient air. For more information about the tube, see Nafion membrane tube in sampling.
- There is no specific time limit for sampling, but you need to remove condensed water from the tube from time to time. Condensation will start to form inside the tube within 5 minutes, actual droplets of water within hours.
To remove condensed water from the sampling tube:
- Stop the measurement by switching off Indigo80 or by disconnecting GMP80P from Indigo80.
- Detach the tube from GMP80P and the incubator.
- Shake the tube to remove any condensed water from inside. Alternatively, you can use compressed air to blow moisture out from the tube.
- Leave the tube to dry in room temperature.
- Reattach the tube to GMP80P and the incubator sampling port and continue the measurement.