Operation - Extech Instruments RHT20 User Manual

Operation:

The display and front panel buttons provide a means to view the status of the
datalogger, observe the current Temperature or Relative Humidity and to view
the MAX and MIN values recorded during a recording session. The datalogger
setup conditions such as sample rate, temperature units and alarm values are
programmed via the provided software. Refer to the software Help File on the
disk for those procedures.
1. Press the MAX/MIN button to view the recorded Max and Min values with
the time they were recorded. If, while in this mode, no button is pressed
for 40 seconds the display will automatically return to the real time display.
2. The Time and Date display will automatically toggle every 10 seconds
3. When downloading the data to the PC, "-PC-" will be displayed on the
LCD. After the download is complete, the datalogger will display the last
value recorded, but it will stop recording. The logger needs to be re-set
from the software to begin a new recording session.
4. The "REC" LED will flash at the programmed rate when the unit is
datalogging.
5. Alarm function: When the measured value exceeds the programmed
upper or lower limit and the LED function is selected in the software, the
ALM LED will flash one time per minute.
6. If "-LO-" is displayed, the temperature and humidity sensors need
attention.
7. The datalogger should be placed upright when in use.
8. If used in low temperature, high humidity environment, the datalogger
should be placed upright in a dry area to remove any condensation before
downloading the data.
9. Battery life can be extended by leaving the datalogger connected to a pc.
10. Disabling the REC and ALM LED's will extend battery life.
RHT20 V1.0 8/09
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