LI-610 Operation

Air is bubbled through water reservoirs in two nickel-plated condensers to completely saturate the air stream with water vapor.  The temperature of each condenser is precisely controlled to the dew point target by Peltier thermoelectric coolers.  An internal radiator with a cooling fan dissipates heat from the coolers, providing a completely self-contained cooling system.

The water vapor stream exists the condensers via a port on the front panel (designed for 1/8 or 4 mm ID tubing) or can be split to a second port.  An internal pump provides typical flow rates of 0 to 2.0 liters per minute.

Instrument Calibrations

The high accuracy and stability of the LI-610 make it an excellent instrument to calibrate relative humidity sensors and to check the calibration of dew point hygrometers.  An equation is provided to convert dew point temperature to relative humidity, assuming that temperature is accurately measured.  A chart is also provided for quick conversions in the field (see LI-610 Reference Card on the Instruction Manual page).

The LI-610 can be used to calibrate CO2/H2O gas analyzers.  An air stream from the LI-610 is directed through a desiccant to set the analyzer's zero, and a second airstream is used to set the span.

LI-610 with the LI-7000 CO2/H2O Closed Path Analyzer

LI-610 with the LI-7500 CO2/H2O Open Path Analyzer

Continuous Operation

The LI-610 can provide a continuous air stream of known dew point to photosynthesis and stomatal conductance measurement chambers, or for other applications where a known supply of water vapor is required.

Under typical operating conditions, the LI-610 can provide 4 to 8 hours of continuous operation before the condenser needs to be refilled.