Omega WMS-16 User Manual download pdf (Page 3)

WMS-16 Weather Station Operator’s Manual 2

Barometric Pressure

Barometric pressure is sensed using a piezoresistive sensing

element. This element responds to changes in barometric

pressure with a corresponding change in resistance. This

resistance is converted to a voltage from which the

microprocessor calculates the barometric pressure at the

elevation at which the barometer is located.

Since air pressure varies with elevation, the barometric

pressure must be set for the elevation at which the barometer

is installed. This value is set simply using a screwdriver.

Instructions are provided in the Installation Section of this

manual.

Temperature and Relative Humidity

The WMS-16 is designed to accommodate a combination

temperature/ relative humidity sensor. For maximum

accuracy, the sensor should be isolated from the effects of

sunlight a factor that can cause misleading temperature and

humidity measurements. The Model WMS-16-THS Naturally

Aspirated solar shield is provided to give this protection.

Temperature is sensed using a thermistor element whose

resistance changes in response to temperature fluctuations.

Relative humidity is sensed by changes in the dielectric

constant of a thin polymer film as it absorbs moisture or sheds

it to the surrounding air.

Rain

The rain gauge used with the WMS-16 is a traditional tipping

bucket design. Resolution is 0.01 inches.

Using the Data

Once the weather data generated by the WMS-16 has been

logged and saved-either within the control module or on an

external media-it can easily be manipulated by a number of

commercially available software packages. The format of the

columnar, coma-delimited data was carefully designed to

make it compatible with the most widely used spreadsheet

programs. The data can be imported easily into these programs

and from there analyzed or manipulated, making the

information generated by the WMS-16 much more than

simply a collection of numbers.

A number of enhancements to the WMS-16 are planned for

the future that will make the WMS-16 even more responsive

to your needs. The EEPROM in which the operating firmware

is stored can be electronically updated to simplify future

firmware upgrades.

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Omega WMS-16 User Manual Page 3

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