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Calibrate the Rain Gauge
The rain gauge on the 5-in-1 sensor can be calibrated to improve accuracy.
Items Needed
: 5-in-1 sensor, display, plastic cup, pin, screw driver
1. First, ensure 5-in-1 sensor is perfectly level using built-in bubble level.
2. Place display close so you can monitor it during calibration.
3. Make a pin hole in the bottom of a plastic cup. Hold the cup over the rain
gauge and fill it with exactly 1 cup (8oz) of water, allowing the water to drip
into the rain gauge. You should hear the internal buckets tip and see water
drain through the rain gauge.
4. A few seconds after each bucket tip, the display displays rainfall in
approximately 0.01” (.25 mm) or more increments.
5. The cup of water should take more than 20 minutes to empty; a quicker
period will result in inaccurate calibration. Try to simulate a normal steady
rainfall. When cup is empty of water, display should register 1.06” (27 mm).
Tips
• There should be nearly an equal number of water drops (about 25 water
drops) between bucket tips. If not, adjust the calibration screws on the
bottom of the 5-in-1 sensor until an equal number of water drops are tipping
the buckets. Then, restart the calibration procedure.
• If you don’t hear the buckets tipping and see water dripping alternately out
of each drain, there may be an issue with the rain gauge or it’s adjustment.
See Troubleshooting on page 22.
Adjustment
If the rain gauge doesn’t register close to 1.06” (27 mm), make an EQUAL
adjustment to the two calibration screws on the bottom of the 5-in-1 sensor.
Turning screws clockwise increases rainfall; counter clockwise decreases rainfall.
• To adjust the rainfall reading by 2% turn both screws 1/8 of a turn.
• To adjust the rainfall reading by 4% turn both screws 1/4 of a turn.
• To adjust the rainfall reading by 8% turn both screws 1/2 of a turn.
*Barometric pressure must be set to MANUAL mode to calibrate. To change
from AUTO to MANUAL pressure mode and vice versa, press and release the
“select” button until BAROMETER is shown on the Weather Ticker. Press and
release the “options” button and then cycle through the options using the “ “ or
“ “ button. Press and release “
SET
enter
” button once the mode you desire appears
on the Weather Ticker. The “ ” icon will appear next to the barometric
pressure to indicate that MANUAL mode has been activated.
After 5-10 seconds of inactivity, the display will save the adjustments and exit
calibration mode.
NOTE:
Calibrations will be erased if the display is reset or if
batteries are removed and the power adapter is unplugged.
Watch the video at www.acurite.com/5in1
