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Texas Weather Instruments, Inc. 19 WRL Instruction Manual
When the clear button is depressed and held, the unit will display the date and time the
instrument's memory was last cleared. In order to clear the memories, the clear and
minimum button must be pushed at the same time. The items cleared are as follow:
minimum and maximum, wind speed, temperature (indoor, outdoor, and aux), barometric
pressure and humidity. Daily rainfall is cleared automatically at midnight every night.
Monthly rainfall is cleared automatically at midnight on the last day of the month. Term
rainfall may be cleared at any time by the user by depressing clear and last rain at the
same time. The term rainfall register may be used for any term desired by the user, but is
most commonly used to account for yearly rainfall. The memories can also be changed by
using TWICAL.
Rainfall history mode
If the information is available, the actual daily, monthly and term rainfall amounts that
occurred before the installation of the weather station may be manually entered. To do so
enter the rain history mode, by pressing select and last at the same time. The first item to
appear will be the dally rainfall total. Press minimum or maximum to input the correct
amount. Press select again and the monthly rainfall amount will appear. Press select
again and the unit will display term rainfall, change as desired. Press select again and the
unit will return to normal mode.