Section 3. Configuring the gas analyzer
Other options
Enable heater: The heater should be enabled to maintain the optical bench tem-
perature. Normally the optical bench will be about 51.4 °C. If you disable the heater,
the instrument will not perform as specified.
Pressure compensation: Pressure compensation should be applied to ensure that
the instrument compensates for changes in pressure. Disabling pressure com-
pensation will lead to less accurate measurements.
Enable pump: If your instrument is equipped with a pump, this box will be inter-
active. Check it to turn the pump on. Clear it to turn the pump off.
Filter: The digital filter instructs the instrument to average the readings. A value of 0
means no averaging, whereas a value of 20 instructs the instrument to average the
previous 20 seconds of measurements. Increasing the averaging time will decrease
the variation in each reported value, but will also reduce the instrument response
time.
Using the pump
For instruments that are equipped with the LI-COR-installed pump, the pump is
activated through the interface.
Note: The pump will not run until the optical cell has reached the operating tem-
perature of about 50 °C, regardless of the setting. If the cell temperature drops
below 50 °C, the instrument will disable the pump temporarily until the cell
warms back up.
To turn on the pump from the main window, click the pump button so it reads
Pump: On. Or, click Settings > Instrument and check Enable pump.
3-8 Using the LI-830 and LI-850 Gas Analyzers
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