DAVIS Sensor Tilting Bracket Manuel utilisateur

Product#7706

ENSOR

ILTING

RACKET

The Sensor Tilting Bracket (STB) enables you to adjust the position of the solar

radiation sensor and/or the UV sensor to match the angle of the sun’s rays.

Use the STB with the Energy EnviroMonitor™ to match the angle of the solar

radiation sensor to the angle of your solar panels. Use the STB with the Heath

EnviroMonitor™ for maximum temperature-humidity-sun-wind index and/or

UV readings. Do not use the STB when mounting the solar radiation sensor for

use with the GroWeather™. The GroWeather’s ET calculations assume that the

solar radiation sensor is mounted horizontally.

OMPONENTS

The Sensor Tilting Bracket includes the following components. Please make

sure you have all listed components before continuing.

ENSOR

ILTING

RACKET

OMPONENTS

Page2 SensorTiltingBracket

OOLS

AND

ATERIALS

EEDED

In addition to the components listed above, you will need some of the follow-

ing tools and materials. Please be sure you have everything you need before

beginning the installation.

✦

Solar Radiation and/or UV Sensor

You will also need the #6-32 x 1-1/2" (38 mm) machine screws, #6 wash-

ers, #6 screws retainers, and springs included with the sensor.

✦

Medium Phillips Screwdriver

✦

Wrench or Pliers

✦

Drill with 7/32" (.219", 5.5 mm) Drill Bit

✦

Cable Clips or Weather-Resistant Cable Ties with screw holes or other means for

mounting

SING

TANDOFFS

TTACH

ENSOR

Consult the sensor manual for instructions on attaching the sensor to the

STB. However, if mounting the sensor on the tilting bracket in a location

under 46˚ latitude or in a situation which requires the angle of the tilting

bracket to be less than 28˚, you will need to use the standoffs supplied with

the tilting bracket as shown below. (The standoffs allow enough room

between the bottom of the sensor and the SMA.) The standoffs are made of

aluminum; take care not to overtighten when screwing into the bracket.

Consult the sensor manual for the remaining instructions on attaching the

sensor to the STB.

SING

TANDOFFS

OUNT

THE

ENSOR

MountingtheSensorTiltingBracket Page3

OUNTING

THE

ENSOR

ILTING

RACKET

The instructions below explain how to select the correct tilt angle for the STB

and how to mount STB on the Sensor Mounting Arm or on another surface.

The Tilt Angle

The STB allows you to angle the sensors between 0˚ and 66˚, depending on

which hole in the STB arms you use when mounting the bracket. The illustra-

tion below shows the orientation of the holes (from 1 to 16).

ENSOR

ILT

RACKET

OLE

ESIGNATIONS

The table below shows the tilt angle achieved by using any given hole.

OLE

# S

ENSOR

NGLE

OLE

# S

ENSOR

NGLE

1 66.0˚ 9 32.6˚

2 61.5˚ 10 28.5˚

3 57.3˚ 11 24.4˚

4 53.0˚ 12 20.3˚

5 48.9˚ 13 15.7˚

6 44.7˚ 14 11.4˚

7 40.6˚ 15 6.4˚

8 36.6˚ 16 0.0˚

Page4 SensorTiltingBracket

Determining the Correct Tilt Angle

If you know the angle at which you want to mount the sensor (to match the

angle of a solar panel, for example), use the table in “The Tilt Angle” on page 3

to determine which hole on the STB arms best matches that angle.

To maximize solar radiation or UV readings (and all related readings), start by

determining your latitude. Determine the correct angle (depending on the sea-

son during which you want maximum readings) as described below. Finally,

use the table in “The Tilt Angle” on page 3 to determine which hole on the STB

arms best matches that angle.

Note:

If desired, you may change the angle of the STB every four months to maximize your readings

year round.

✦

Maximum Readings During Spring or Fall

If you want maximum readings in the Spring or Fall, use your latitude as

the angle (that is, at 45˚ latitude, use an angle of 45˚).

✦

Maximum Readings During Summer

If you want maximum readings in the Summer, subtract 18˚ from your

latitude to determine the correct angle (that is, at 45˚ latitude, use an

angle of 27˚).

✦

Maximum Readings During Winter

If you want to maximize readings in the Winter, add 18˚ to your latitude

to determine the correct angle (that is, at 45˚ latitude, use an angle of

63˚).

For greater accuracy in determining the correct angle, consult a table of the

sun’s declination over the desired time span. The best tilt angle is derived by

subtracting declination from latitude. You may then use the table in “The Tilt

Angle” on page 3 to determine which hole on the STB arms best matches that

angle.

MountingtheSensorTiltingBracket Page5

Mounting on the Sensor Mounting Arm

Follow the instructions below to mount the STB on the Sensor Mounting Arm

(SMA).

1. Make sure that you mount the SMA (or plan to mount the SMA) so the sensor(s) on the

STB point towards the sun at solar noon.

Solar noon occurs halfway between sunrise and sunset; consult your local paper

or the WeatherLink

software for sunrise and sunset times. To correctly align

the arm, screw a mounting screw part way into any of the screw positions on

the mounting arm and rotate the arm until the shadow from the screw is paral-

lel to the edge of the sensor arm at solar noon.

2. Attach the STB to the SMA as shown below using the #8-32 screws, #8 washers, #8

lock washers, and #8-32 hex nuts. See “The Tilt Angle” on page 3 to determine which

hole to use on the arms.

Make sure you place three #8 washers between the arms and the SMA. For

clarity, the sensor is not shown in the drawing below.

OUNTING

THE

ENSOR

OUNTING

3. Make sure you secure the sensor cable below the SMA as shown in the sensor manual.

Page6 SensorTiltingBracket

Mounting on Alternate Surfaces

You may also mount the STB on a block of wood or a metal bracket.

1. Prepare the mounting surface by drilling two holes using a 7/32" (.219", 5.5 mm) drill

bit in the locations shown below.

REPARING

OUNTING

URFACE

2. Make sure that you position the alternate surface (or plan to position it) so the sen-

sor(s) on the STB point towards the sun at solar noon.

Solar noon occurs halfway between sunrise and sunset; consult your local paper

or the WeatherLink

software for sunrise and sunset times.

MountingtheSensorTiltingBracket Page7

3. Attach the STB to the surface as shown below using the #8-32 screws, #8 washers,

#8 lock washers, and #8-32 hex nuts. See “The Tilt Angle” on page 3 to determine

which hole to use on the arms.

Make sure you place three #8 washers between the arms and the mounting

surface. For clarity, the sensor is not shown in the drawing below.

OUNTING

LTERNATE

URFACE

4. Secure the sensor cable to the mounting surface using cable clips or weather resistant

cable ties with screw holes or other means for mounting.

ECURING

ENSOR

ABLE

Product Numbers: 7706

Davis Instruments Part Number: 7395-108

Sensor Tilting Bracket

Rev. B Manual (10/14/99)

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

Directive 89/336/EC.

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