Davis Instruments Leaf Wetness Sensor Manual de usuario

Product#7846&7848

EAF

ETNESS

ENSOR

TANDARD

& I

NDUSTRIAL

NSTALLATION

ANUAL

The leaf wetness sensor enables the GroWeather™ to detect the presence of

surface moisture on foliage and calculate the duration of wetness. When mois-

ture is present, the sensor detects an electrical resistance change between the

gold-plated elements of the grid. This is displayed by the GroWeather console

as a value between 0 (dry) and 15 (wet). Using the GroWeatherLink

software,

you may select your own wetness threshold; the software will then calculate

leaf-wet hours.

OMPONENTS

The leaf wetness sensor includes the following components. Please make sure

you have all listed components before continuing.

✦

Leaf Wetness Sensor with

attached mounting bracket

The standard version of

the sensor includes an

attached 40’ (12 m) cable.

The industrial version

includes a 16’ (5 m) cable.

✦

Installation Hardware Kit

✦

One 1-1/2" U-Bolt

✦

Two 1/4" Flat Washers

✦

Two 1/4" Hex Nuts

✦

Two #8 Wood Screws

✦

Two #8 x 3/4"

Machine Screws

✦

Four # 8 Flat Washers

✦

Two # 8 Lock Washers

✦

Two # 8 Hex Nuts

Page2 LeafWetnessSensor

OOLS

AND

ATERIALS

EEDED

You may need some of the following tools and materials in order to complete

your installation. Please be sure you have everything you need before begin-

ning.

✦

Medium Phillips Screwdriver

✦

Wrench

✦

Drill with 7/32" (5.5 mm) Drill Bit

To drill holes in the Sensor Mounting Arm (SMA) if installing on an

older version of the SMA.

✦

7/16" Wrench or Adjustable Wrench

To tighten hex nuts if installing on a pipe.

ESTING

THE

ENSOR

You may test the sensor before you install it or you may test it after installing it.

The instructions below provide a quick description of the suggested test proce-

dure.

1. Attach the sensor cable to the connector S3 on the sensor interface module (SIM).

Consult the installation manual for instructions

2. Press the appropriate key(s) to make sure you are getting a leaf wetness reading on

the console.

Consult the GroWeather manual for instructions on displaying leaf wetness.

3. Drop or spray water onto the sensor and make sure the reading changes.

InstallingtheSensor Page3

NSTALLING

THE

ENSOR

Follow the instructions in this section to install your sensor. Before you begin,

consult the System Installation manual for instructions on labeling the leaf wet-

ness sensor cable.

Typical Standard Installation

The illustration below shows typical standard leaf wetness installation. The

sensor cable attaches to connector S3 on the sensor interface module (SIM).

YPICAL

TANDARD

NSTALLATION

Page4 LeafWetnessSensor

Typical Industrial Installation

The illustration below shows typical industrial leaf wetness installation. The

sensor cable attaches to connector S3 on the sensor interface module (SIM).

YPICAL

NDUSTRIAL

NSTALLATION

InstallingtheSensor Page5

Mounting the Sensor on the Sensor Mounting Arm

Follow the instructions below to mount the sensor on the Sensor Mounting

Arm (SMA).

1. If no holes exist on the side of the mounting arm, you need to mark the location of the

two holes on the mounting bracket and drill holes through the SMA in these locations

using a 7/32" (5.5 mm) drill bit. If you are not using the Sensor Tilting Bracket, you

may use one of the holes designated for the bracket for the leaf wetness sensor.

Early versions of the SMA did not include holes for the leaf wetness sensor.

If your SMA includes holes for the leaf wetness sensor, you may skip this

step.

2. Attach the leaf wetness sensor to the SMA using the #8 x 3/4" machine screws, # 8

ﬂat washers, # 8 lock washers, and # 8 hex nuts as shown below.

OUNTING

THE

ENSOR

OUNTING

Page6 LeafWetnessSensor

Mounting the Sensor Against a Wooden Surface

To mount the sensor against a wooden surface, secure the sensor to the surface

using the #8 wood screws as shown below.

OUNTING

OODEN

URFACE

Mounting the Sensor on a Pipe

To mount the sensor on a pipe, stake, or pole with outside diameter between

1" and 1-1/4" (25 mm and 31 mm), secure the sensor to the pipe using the 1-1/

2" U-bolts, 1/4" ﬂat washers, and 1/4" hex nuts as shown below. Use a 7/16"

wrench or adjustable wrench to tighten the hex nuts.

OUNTING

IPE

TechnicalSupport Page7

ECHNICAL

UPPORT

Before calling Technical Support (1-510-732-7814), carefully check all cable con-

nections from the sensor to the console. Cable connections account for a large

portion of the potential problems. Connections should be ﬁrmly seated in the

jacks and plugged in straight. If you think a connection may be faulty, try jig-

gling the cable while looking at the display. If a reading appears intermittently

on the display as you jiggle the cable, the connection is faulty.

Product Numbers: 7846 & 7848

Davis Instruments Part Number: 7395-110

Leaf Wetness Sensor, Standard and Industrial

Rev. D Manual (7/7/99)

This product complies with the essential protection requirements of the EC EMC

Directive 89/336/EC.

Este manual sirve para los siguientes modelos

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