Calibrate The Rain Gauge; Specifications - AcuRite Iris Instruction Manual

Calibrate the Rain Gauge

The rain gauge on the AcuRite Iris sensor can be calibrated to improve accuracy.
Items Needed: AcuRite Iris sensor, companion unit, plastic cup, pin, screw driver
1. First, ensure AcuRite Iris sensor is perfectly level using built-in bubble level.
2. Use compatible companion unit or AcuRite software to monitor during calibration.
3. Make a pin hole in the bottom of a plastic cup. Hold the cup over the rain gauge and
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 companion unit displays rainfall in approximately 0.01" 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, companion unit
should register 1.06"
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 AcuRite Iris sensor until an equal number of
water drops are tipping the buckets.
Adjustment
If the rain gauge doesn't register close to 1.06", make an EQUAL adjustment to the two calibration screws
on the bottom of the AcuRite Iris 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.

Specifications

TEMPERATURE RANGE
HUMIDITY RANGE
WIND SPEED
WIND DIRECTION INDICATORS
RAINFALL
WIRELESS RANGE
OPERATING FREQUENCY
POWER
DATA REPORTING
Outdoor: -40ºF to 158ºF; -40ºC to 70ºC
Outdoor: 1% to 99%
0 to 99 mph; 0 to 159 kph; 0 to 86 knots
16 points
0.01 inches (0.25 mm) and up
330 ft / 100 m
depending on home construction materials
433 MHz
4 x AA alkaline or lithium batteries
Wind Speed: 18 second updates; Direction: 36 second updates
Outdoor temperature & humidity: 36 second updates
6
fill it with