Campbell LWS-L Návod k obsluze stáhnout pdf (Strana 55)

Campbell Scientific LWS-L Leaf Wetness Sensor

RM72004,000015E -19-07MAY13-1/1

RM72004,0000168 -19-07MAY13-1/1

RM72004,000015F -19-07MAY13-1/1

RM72004,0000160 -19-07MAY13-1/1

RM72004,00001A0 -19-07MAY13-1/1

Theory of Operation

The Leaf Wetness Sensor imitates leaf characteristics and

is used in the plant canopy or on a weather station mast.

The sensor detects moisture or frost on the upper surface

by measuring the dielectric constant of the surface.

PC15763 —UN—24AUG12

Specifications

Measurement Time: 10 ms

Power: 2.5 VDC @ 2 mA, to 5 VDC @ 7 mA

Output: 320—1000 mV @ 3 V excitation

Operating Environment: -20—60 °C (-4—140 °F)

Dimensions: 11.2 cm x 5.8 cm x 0.075 cm (4.4 in. x 2.3

in. x 0.03 in.)

Cable Length: 6 m (20 ft.)

Connector Type: Molex MX150

Mounting Location

The Leaf Wetness Sensor is mounted either in crop

canopy or with other sensors being used.

Maintenance

NOTE: Contact your John Deere dealer for

replacement parts.

Accumulation of dust and debris on Leaf Wetness Sensor

causes dry output to increase. Clean sensing surface with

a moist cloth periodically or when elevated dry output is

detected. Sensors exposed to high levels of UV radiation

develop a chalky residue on sensor surface. Chalky

residue causes surface to lose its sheen over time. A

small amount of chalky residue can be rubbed off sensor

during aggressive cleaning.

External Cleaning Of Probe, Sensors, and

Gateway

IMPORTANT: Field Connect components and

connections may not be weatherproof. Properly

close and latch enclosure cover after any

procedure completed inside enclosure.

Do not use pressure washer or common solvents such

as automotive brake cleaning fluid to clean soil moisture

probe, sensors, or gateway. To remove soil from plastic

components, use a solution of soap and water.

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