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WMR300/200/89/86 Installing your Weather Station

Wind, air temperature, and water vapour pressure measurements are affected by surface type and roughness, soil moisture, regional topography, and obstructions.

Sites selected for their applicability to a broader area should be free from obstructions such as buildings, trees, and steep slopes. Ten-meter towers are often used to raise measurement heights above low-lying obstructions. The following table lists the suggested measurement heights and exposure (distance to an obstruction) for each type of sensor.

Suggested Measurement Heights and Exposure

Sensor Type

Measurement Height or Depth

Exposure Considerations

Wind

3 m ± 0.1 m recommended (AASC) 2 m ± 0.1 m, 10 m ± 0.5 m, optional (AASC) 10 m (WMO & EPA)

No closer than ten times the obstruction's height

Air Temperature & Relative Humidity

1.5 m ± 1 m (AASC) 1.25-2.0 m (WMO) 2.0 m for temperature only (EPA) 2 m & 10 m for temperature difference (EPA)

The sensor must be housed in a ventilated radiation shield to protect the sensor from thermal radiation. The EPA recommends the sensor be no closer than four times the obstruction's height and at least 30 m from large paved areas. If no shield is available then the sensor should be mounted in a shaded south facing location.

Solar Radiation

Height should be consistent with the exposure standard (AASC, WMO, EPA). To facilitate levelling/cleaning, CSI recommends installing at a height of 3 m or less.

Any surrounding object should not block the sky. However, objects

Precipitation

1.0 m ± 0.2 m (AASC) 30 cm minimum (WMO)

AASC & EPA suggest the sensor be no closer than four times the obstruction's height. The orifice of the gage must be in a horizontal plane, open to the sky, and above the level of in-splashing and snow accumulation.

 

What is the maximum transmission distance between the console and the remote sensors?

100 metres for a clear line of site. This distance varies as a function of obstructions (water, concrete and metal can shorten this distance), but is dependent on your particular installation.

How long do the batteries last in the remote solar transmitters?

It depends on the installation and environmental factors, but 1year is normal. Lithium batteries are recommended for colder climates. Please note the solar panel on the WMR200 does not provide “full power to the sensor and only assists in extending battery life therefore all sensors must have viable batteries installed to transmit data.

Where should I place my sensors?

Place the anemometer in the highest location possible. This will eliminate any obstructions. Remember that you will need to change the batteries once per year, so make it accessible.

The temperature and humidity sensor requires a shaded, well-ventilated location. Radiant heat transfer from your house can raise the temperature as much as 6 deg F, so keep away from walls that receive a lot of sunshine.

The rain gauge should be in an accessible location (near the ground), free of obstructions. The gauge can freeze in cold climates, and debris must be cleared on occasion.

Optional sensors THGR810 and UVN800 provide measurements for temperature and Humidity in extra locations and UV radiation.

How should I mount the anemometer?

You will need a metal pole. In some environments, you can use PVC pipe. Mount the brackets to the pole.

My barometer is reading too low. Shouldn't it read between 29.00 and 31.00 in Hg? How do I correct the barometer to sea level?

To compare pressure conditions from one location to another, meteorologists correct pressure to sea level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected pressure (the pressure your location would be at if located at sea-level) is generally higher than your measured pressure. Thus, your pressure may read 28.62 in Hg (969 mb) at an altitude of 1000 feet (305 m), but the corrected pressure is 30.00 in Hg (1016 mb).

The standard sea-level pressure is 29.92 in Hg (1013 mb). Pressure conditions greater than 29.92 in Hg (1013 mb) are considered high pressure and less than are considered low pressure.

Can I turn the touch screen beep sound off?

No

One of the sensors read "---". How do I troubleshoot this problem?

Make sure that the sensor transmitter light is flashing read once every minute. If not, replace the batteries. If the problem remains with the sensor, replace the sensor.