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SETTING MIN/MAX
FORM FEED
RAIN RATE
0 OFF OFF OFF
1 ON OFF OFF
2 OFF OFF OFF
3 ON ON OFF
4 OFF OFF ON
5 ON OFF ON
6 OFF OFF ON
7 ON ON ON
When rain rate is off, term rain is substituted.
Min/Max, when selected outputs at midnight the minimum and maximum value for the day. The
report function must be on in order for the output to occur. This function must also be on if you want
the minimum and maximum to be logged to memory.
Form Feed, when selected sends a form-feed character at midnight, which is normally desirable if a
printer is directly hook up to the RS-232 interface.
Rainfall rate, when selected outputs rainfall rate instead of term rain in the report function.
Special Key Functions
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Select + Report
= Time Set Function
Select + Scale
= Calibration Set Function
Select + Average
= Printer Set Function
Select + Humidity Hold
= Humidity Calibration Set
Clear + Last
= Clears Last Rain
Select + Last
= Enters Rainfall History Mode
Clear + Maximum
= Clears all Maximums and Minimums
Clear + Minimum
= Clears all Maximums and Minimums
Clear +Scale +Average
= Performs a cold boot
Windchill + Comfort
= Dewpoint
Keys must be pressed precisely at the same time to perform the desired function.
Lunar Tide Cycle
The lunar tide cycle function may be set to display the position of the moon in relation to its
revolution around the earth. The moon's position is the primary, although not the only, factor in
predicting high and low coastal tides. High tides are generally present when the moon is overhead
or when the moon is 180 degrees from overhead. Low tide is generally present when the moon is in
the 90 degree or the 270 degree position. This method of predicting tide works well on the West and
East coasts. On the Gulf coast, this method is not as successful.
To set the tide clock, follow the directions in the time set function. The first item to be entered is the
tide cycle duration. The tide cycle duration may be set from 1 to 99 hours. Twelve hours and fifty
one minutes is the normal number for a tide clock. The second item to be entered is the time of the
high tide. This information is generally found in the newspaper. If predicting the tide does not apply
WR-25 Instruction Manual
Texas Weather Instruments, Inc. WR-25 Instruction Manual