Vaisala MAWS201 User's Guide Page 187

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Chapter 7 _____________________________________________________________ Technical Data
VAISALA _______________________________________________________________________ 185
Leaf Wetness Sensor
Table 60 QLW101 Leaf Wetness Sensor Specifications
Property Description/Value
Sensor Type Artificial leaf electrical resistance
Excitation Bipolar (5V nominal) built-in
Time Constant
1)
2 seconds
Current Output Variable resistance:>1MOhm (dry) to
<130KOhm (wet)
Supply Voltage 1mA (typical) at +5 VDC ±10%
Sensor Area 28 cm
2
Attached Cable Length 5 m
Cable Type 2-twisted pair, 24 AWG shielded cable with
UV-resistant jacket, wires stripped and
tinned
Recommended Max Cable
Length
1)
24 AWG Cable (3-
conductor)
22 AWG 2-Twisted Pair
Cable
18 AWG Cable (3-
conductor)
91 m
194 m
218 m
Substrate material
Grid material
Mounting Bracket
Glass-reinforced, ceramic-filled laminate
1 oz. copper, nickel, and 50 µin gold plate
White powder-coated aluminum
Dimensions (H x W x T) 51 mm x 38 mm x 6 mm
Weight 227 g
1) Increasing the cable length above the recommended maximum cable length causes
measurement error in the form of lower moisture readings.
Fuel Moisture Sensor
Table 61 QFM101 Fuel Moisture Sensor Specifications
Property Description/Value
Fuel moisture sensing
element
Dry ponderosa pine dowel with imbedded
wire electrodes
Fuel moisture measurement
principal
Capacitance of wood calibrated to read
percentage of moisture by weight.
Fuel moisture measurement
accuracy
0 ... 12 %FM
1)
: ±1.9 %FM RMSE
2)
(two-
week period)
12 ... 30 %FM: ±3.6 %FM RMSE
>30 %FM: ±16 %FM RMSE
Temperature sensor Single thermistor
Conversion table range -50 °C ... +50 °C
Temperature measurement
accuracy
±0.2°C, from -20 °C to +80 °C
Size Base diameter 28.6 mm
Over-all length 305 mm
Weight 125 g
1) %FM = measured fuel moisture units
2) RMSE = Root Mean Square Error
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