sensors

1. atmosphere

precipitation

Lambrecht, tipping bucket Rain Gauge, Joss-Tognini type

• Measurement range:      0 … 8 mm/min

• Resolution:                   0.1 mm

• Collecting surface:         200 cm²/WMO standard

• Output:                        pulse (counter)

• Operating temperature: -20°C … +70°C heated

 

 
wind

Adcon Telemetry, Wind Sensor Set Pro10

 Adcon logo

wind speed

wind direction

 
• Measurement range:     1.44 ... 200km/h 0° - 360°
• Linearity:    < ± 0.5m/s < ± 2.5°
• Output:   0 ... 2.5V DC 0 ... 2.5V DC
• Standard:   VDI 3786, sheet 2 / WMO No.8
• Operating temperature: -40°C ... +70°C (non-icing)

 

 
air T & RH%

 Campbell CS215, air temperature & humidity probe

 

temperature

relative humidity

 
• Measurement range:     -40° to +70°C 0 to 100% RH (-20° to +60°C)
• Output Resolution 0.01°C 0.03% RH
• Accuracy  ±0.3°C at 25°C;
±0.4°C (+5° to +40°C);
±0.9°C (-40° to +70°C)
(at 25°C):
±2% (10% to 90% range),
±4% (0% to 100% range) 

naturally aspirated
radiation shield 41303-5A

• Short Term Hysteresis  < 1% RH

Met20 increases the temperature up to 0.75°C @ strong radiation & low wind speed <1 m s-1

• Temperature Dependence:  better than ±2%
(-20° to 60°C)
• Stability   ±1.0% per year
• response time < 120 s
(63% in air moving at 1 m s-1)
< 20 s
(63%
 in still air)
• Output:   digital, SDI12
• Operating temperature: -40°C ... +70°C (non-icing)

 

 
radiation

Li-Cor, photosyntheticallt active radiation (PAR) and global radiation

 

Li-190
PAR

Li-200
global

 
• Sensitivity
  (typical)
5µA per 1000 µmol s-1 m-2 90 µA per 1000 W m-2
• Linearity
  (Maximum deviation)
1% up to 10,000 µmol s-1 m-2. 1% up to 3000 W m-2
• Anzimuth < ± 1% error over 360° at 45° elevation
• Temperature Dependence:  0.15% per °C maximum
• Stability  < ± 2% change over a 1 year period
• response time  10 µs
• Output:   tension (using standardised millivolt adapter)
• Operating conditions: - 40 to 65 °C    0 to 100%

 

 
 

 

2. soil

T / H2O content / cond.

Stevens Water Monitoring Systems Inc., Soil Moisture, Hydra Probe II

 

temperature

° C

water content

m3 m-3

conductivity

S/m

dielectric constant

[ ]

• Measurement
  Range
-10° to +55° Completely dry to fully saturated 0.001 to 1.5 1 to 80 where 1 = air
80 = distilled water
• Accuracy +/- 0.1° ± 0.01 for most soils
± 0.03 max for fine textured soils
± 2.0% or 0.005 S/m
whichever is typically greater
± 1.5% or 0.2 whichever
is typically greater
• Precision   +/- 0.003    
• Intersensor
  variability
  ± 0.012    
• Resolution 0.2°  0.001    
• Output:     digital, SDI12
 

 

 
matric potential

Stevens Water Monitoring Systems Inc., Soil Moisture, Hydra Probe II

 

temperature

° C

matric potential

pf

• Measurement Range -40° to +80° 0 to 7
(0 up to 10,000,000 cm H2O)
• Resolution 0.1° 0.01
• Output:   digital, SDI12
 

 
 

 

3. biological

stemgrowth

Ecomatik, Dendrometer, DC2

 

stem circumference

 
• Measurement Range 15 mm
(8 -10 mm diameter)
• Resolution infinite
• Accuracy ±2 µm ± 0,12%
• Linearity 2%
• Temperature coefficient <1,4 ×10-6/K (cable)
<0,1 µm/K   (sensor)
• Output:   resistance
• Operating conditions -30° ... +40° C, humidity: 0-100%

 
leaf wetness

Adcon Telemetry, Leaf Wetness, WET

 

leaf wetness

Repeatability ±3 %