ACU-RITE 00875 Gebruiksaanwijzing - Pagina 11

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Calibration

Calibrate the Rain Gauge

The rain gauge can be calibrated to improve accuracy.

Items Needed: rain collector, display unit, plastic cup, pin, screw driver

1. First, place the rain collector on a level surface.

2. Place the display unit close by 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 (8 oz.) of water, allowing the water to

slowly drip into the rain gauge. You should hear the internal cups tipping

and see the water drain through the rain gauge.

4. A few seconds after each cup tip, the display unit will display rainfall in

approximately 0.01" (0.2 mm) or more increments.

5. The cup of water should take more than 20 minutes to empty; a quicker

period will result in an inaccurate calibration. Try to simulate a normal

steady rainfall. When the cup is empty of water, the display unit

should register 2.20" (55.88 mm).

Tips

• There should be nearly an equal number of water drops between cup tips.

If not, then adjust the calibration screws beneath the tipping lever until

an equal number of water drops are tipping the cups. Then, restart the

calibration procedure.

• If you don't hear the cups tipping and see water dripping alternately out of

each drain, there may be an issue with the rain gauge or it's adjustment.

Adjustment

If the rain gauge doesn't register close to

2.20" (55.88 mm) after the cup is empty,

make an EQUAL adjustment to the two

calibration screws, located beneath the

tipping cups. Turn screws counter-clockwise

to increase rainfall. Turn screws clockwise to

decrease rainfall.

• To adjust the rainfall reading by 2%

turn both screws 1/4 of a turn.

• To adjust the rainfall reading by 4%

turn both screws 1/2 of a turn.

• To adjust the rainfall reading by 8%

turn both screws 1 full turn.

Increase

Decrease

Rainfall

2 CALIBRATION SCREWS

COLLECTING CUP

Increase

Decrease

Rainfall