TAHMO

Technical Information

TAHMO MicroEnvironment Monitor (MEM)

Station specifications:
Provided with solar charger for self-powered operation with 6-month backup battery
Hourly GPRS reporting with 5 minute readings

Soil moisture and groundwater sensors available upon request.


SensorOperating temperature rangeNotes
Anemometer-40 to 50 C

Maximum sampling speed: 1 Hz.

Output: Avarage speed, gust speed, direction, or vector.

Rain gauge0 to 60 CNot suitable for snowfall measurement.
Pyronometer-40 to 60 C

Spectral range: 380 to 1120 nm.

Field of view: hemisperical, 180 C.

Barometer-40 to 85 C-500 m to 9,000 m above sea level.

Parameter
RangeResolutionAccuracy
Wind speed0 to 40 m/s0.01 m/s 3 %
Wind direction0 to 359 degrees1 degrees 5 degrees
Temperature-40 to 50 C0.1 C 1.0 C
Relative humidity0 to 100% RH0.1% RH 3%
Vapor pressure0 to 47 kPa0.01 kPa 0.2 kPa
Precipitation0 to 400 mm/hr0.017 mm 5%
Solar radiation0 to 1,750 W/m21 W/m2 5%
Barometric pressure50 to 110 kPa0.01 kPa 0.1 kPa

Use the specs from here for the sensor suite and here for the data logger. 

School 2 School Variables

1. The Sensors

3. Pole Installation

5. Station Installation

2. Site Selection

4. How to make a slip knot

Relative Humidity
This variable is retrieved from the API as a fraction, please multiply by 100 to get percentages.
Small timespan: Hourly averages
Larger timespan: Daily averages

Individual value range: 0 – 150%

Precipitation
Small timespan: Hourly cumulative
Larger timespan: Daily cumulative

Individual value range: 0 – 50 mm

Pressure
Small timespan: Hourly averages
Larger timespan: Daily averages

Individual value range: 50 -150 kPa

Radiation
Small timespan: Hourly averages
Larger timespan: Averages per 3 hours

Individual value range: 0 – 1500 W/m2

Temperature
Small timespan: Hourly averages
Larger timespan: Averages per 3 hours

Individual value range: (-50) – (+100) C

Wind direction
Classify each measurement into a direction (N, NE, E, SE, S, SW, W, NW),
Direction North are values above 337.5 and below 22.5, North-east values between 22.5 and 67.5 etc….
The direction with most occurrences within the specified timeframe will be the representing value.

Small timespan: Hourly dominant direction
Larger timespan: Daily dominant direction

Individual value range: 0 – 360 degrees

Wind speed
The TAHMO_VAR009 is the measurement data, please use this one.

Small timespan: Hourly averages
Larger timespan: Averages per 3 hours

Individual value range: 0 – 100 m/s