Tetra Flow sampling
Pumped instruments
Tetra’s inbuilt pump draws sample air in through the inlet nozzle of the flow
adaptor plate and out through the outlet nozzle. When using sampling equip-
ment, if the inlet should become blocked with dirt, water or a kink in the line,
the pump will automatically stop. Tetra will emit a rapid series of beeps and dis-
play a warning message. To restart the pump, clear the blockage and press the
operator button.
Diffusion instruments
When using the manual aspirator kit, adopt a consistent style whilst using the
hand aspirator. Crowcon recommend squeezing once per second to achieve a
flow rate of approximately 0.5 - 1 litre/min. At least 10 pumps per sample are
recommended.
17
Extension probes, drop lines
and water traps are available.
See accessories section XI.
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