DAVIS UV Sensor Manual de usuario

Product#7841,7843,6490

UV S

ENSOR

TANDARD

NDUSTRIAL

, & V

ANTAGE

EATHER

TATIONS

The UV Sensor is a precision instrument that detects ultraviolet (UV) radiation

at wavelengths of 290 to 390 nanometers. The spectral response is closely

matched to the Erythema Action Spectrum, deﬁned by McKinlay and Diffey

(1987) and internationally recognized as the radiation that is most responsible

for causing redness of the human skin.

Avoid touching the small white diffuser at the top of the sensor.

Any skin oil

on this surface will degrade the sensitivity of the sensor. To remove any oil

present, clean the diffuser with a clean swab and ethyl (denatured) alcohol. Do

NOT use rubbing alcohol.

Note:

It should be noted that sunburn is not the only consequence of exposure to UV radiation. Skin cancers,

cataracts, and damage to the immune system are caused by UV. Exposure to UV should be minimized.

The sensor is made up of the following components:

✦

Shield

The outer shell shields the sensor body from thermal radiation and pro-

vides a path for convection cooling of the body, minimizing heating of

the sensor interior. It provides a cutoff ring for cosine response, a level

indicator, and ﬁns to aid in aligning the sensor with the sun’s rays.

✦

Body, housing the following components:

✦

Cap

Retains the diffuser and ﬁlter

✦

Diffuser

Provides (with gasket) a weather-tight seal and excellent cosine response.

✦

Filter

With multiple hard-oxide coatings, the ﬁlter provides the Erythema

Action spectral response. It is stable in the presence of heat and humidity.

✦

Detector

The semiconductor diode, with the ﬁlter, responds only to radiation in the

region of interest.

✦

Ampliﬁer

Converts the detector current into a 0 to +2.5V signal.

✦

Cable

The standard version of the sensor includes an attached standard 40'

(12 m) cable. The industrial version includes a 16' (5 m) shielded cable.

The Vantage Pro version includes a standard 3' (0.9 m) cable.

Page2 UVSensor

OUNTING

ARDWARE

Please make sure you have all components listed below before continuing.

✦

Shield

✦

Body with cable attached

✦

Mounting hardware

Enables installation and

leveling of the sensor.

✦

Three #6-32 x 1-1/2"

(38 mm) machine screws

✦

Three springs

✦

Three #6 ﬂat washers

✦

Three #6 screw retainers

✦

Three #4 screw retainers

✦

Three wood screws

✦

One #8-32 x 3/4" (19 mm)

machine screw

✦

One #8-32 hex nut

✦

One #8 ﬂat washer

✦

One 3/16" (5 mm) cable

clamp

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 beginning.

✦

Medium Phillips screwdriver

✦

Center punch or nail (if mounting on wood surface)

✦

Drill with 7/8" (22 mm) and #36 (2.7 mm) drill bits (if mounting on wood surface)

✦

Wire cutters and stripper (industrial version only)

Contents Page3

ONTENTS

PECIFICATIONS

ARE

VAILABLE

For detailed technical information on the UV sensor, call Technical Support

(510) 732-7814 to request a speciﬁcation sheet, or download it from our website:

http://www.davisnet.com/support/weather/

TANDARD

AND

NDUSTRIAL

ERSIONS

: I

NSTALLATION

Testing the Sensor

1. Attach the sensor cable to the connector S3 on the sensor interface module, or “SIM”.

Consult the System Installation manual for instructions.

2. Press UV on the Health EnviroMonitor to make sure you are getting a UV reading.

Consult the Health EnviroMonitor manual for instructions on displaying UV.

3. Shade the sensor and make sure the reading drops.

Standard and Industrial Versions: Installation..............................

Testing the Sensor..........................................................................

Installing the Sensor.......................................................................

Typical Standard Installation.........................................................

Typical Industrial Installation........................................................

Mounting on the Sensor Mounting Arm.........................................

Mounting on the Sensor Tilting Bracket........................................

Mounting on a Wood Surface..........................................................

Routing Sensor Cable.....................................................................

Vantage Pro Version: Installation on the Sensor Mounting Shelf..

Testing the Sensor..........................................................................

Accessing the SIM...........................................................................

Securing the Sensor on the Shelf....................................................

Routing Sensor Cable.....................................................................

If You Are Going to Install the Solar Radiation Sensor.................

Maintaining the Sensor..................................................................

Technical Support..........................................................................

Page4 UVSensor

Installing the Sensor

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

consult the System Installation manual for instructions on labeling the UV sen-

sor cable.

✦

For scientiﬁc measurements you may mount the sensor on the Sensor Mounting

Arm (SMA) or any level surface.

✦

For measurements where the immediate effect on human health is of interest, we

recommend that you mount the sensor such that its axis is aligned with the sun’s

rays at solar noon.

This maximizes the mid-day readings and provides what is probably a

more accurate measure of the UV that people are exposed to. The Sensor

Tilting Bracket #7706 is designed for this purpose.

Typical Standard Installation

The illustration below shows typical standard UV installation. The sensor cable

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

YPICAL

TANDARD

NSTALLATION

StandardandIndustrialVersions:Installation Page5

Typical Industrial Installation

The illustration below shows typical industrial UV installation. The sensor

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

YPICAL

NDUSTRIAL

NSTALLATION

Page6 UVSensor

Mounting on the Sensor Mounting Arm

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

Arm (SMA).

1. Route the sensor cable through the large hole in the mounting arm if desired.

2. Place the shield onto the body as shown below.

LACING

HIELD

ONTO

ODY

3. Place a ﬂat washer over the end of each screw and insert it into the body.

4. Place a spring over the end of each screw and hold the springs in place using a #6

screw retainer.

5. Secure the sensor to the mounting arm by driving the screws into the appropriate

holes as shown below.

OUNTING

THE

UV S

ENSOR

THE

SMA

StandardandIndustrialVersions:Installation Page7

6. Using the bubble level on the sensor as a guide, adjust the sensor until it is level by

tightening or loosening the screws as necessary.

7. Secure the sensor cable to the underside of the mounting arm using the 3/16" cable

clamp, #8-32 x 3/4" screw, #8 hex nut, and #8 ﬂat washer as shown below.

ECURING

ENSOR

ABLE

Mounting on the Sensor Tilting Bracket

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

Bracket. Do not install the bracket onto the mounting arm until instructed to do

so below.

1. Route the sensor cable through the large hole in the bracket if desired.

2. Place the shield onto the body as shown below.

LACING

HIELD

ONTO

ODY

Page8 UVSensor

3. Place a ﬂat washer over the end of each screw and insert it into the body.

4. Place a spring over the end of each screw and hold the springs in place using a #6

screw retainer.

5. Secure the sensor to the sensor tilt bracket by driving the screws into the appropriate

holes as shown below.

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. Con-

sult the Sensor Tilting Bracket manual for details.

OUNTING

THE

UV S

ENSOR

THE

ENSOR

ILTING

RACKET

6. Position the Sensor Mounting Arm so it is pointed in the direction of 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 sensor’s screw posi-

tions on the mounting arm and rotate the arm until the shadow from the screw

is parallel to the edge of the sensor arm at solar noon.

7. Attach the bracket to the mounting arm as described in the Sensor Tilting Bracket

instruction manual.

If you are installing both the solar radiation and the UV sensor on the sensor

tilting bracket, make sure you mount the solar radiation sensor on the sen-

sor tilting bracket before attaching to the sensor mounting arm.

StandardandIndustrialVersions:Installation Page9

8. If necessary, adjust the position of the sensor by tightening or loosening the levelling

screws.

When pointed directly at the sun, the shadows from the alignment ﬁns

should appear as shown in the illustration below.

INAL

SENSOR

OSITIONING

9. Secure the sensor cable to the underside of the mounting arm using the 3/16" cable

clamp, #8-32 x 3/4" screw, #8 hex nut, and #8 ﬂat washer as shown below.

ECURING

ENSOR

ABLE

Page10 UVSensor

Mounting on a Wood Surface

Follow the instructions below to mount the sensor on a wood surface.

1. Using the template printed at the bottom of this page, mark the location of the neces-

sary pilot holes.

2. Using a drill with a #36 (2.7 mm) drill bit, drill pilot hole in the marked locations. If

necessary, bore a hole through the mounting surface using a 7/8" (22 mm) drill bit so

the bottom of the sensor can sit inside of it and the sensor cable can run to the other

side.

3. Route the sensor cable through the hole in the wood if desired.

4. Place the shield onto the body as shown below.

PLACING SHIELD ONTO BODY

5. Place a ﬂat washer over the end of each screw and insert it into the body.

6. Place a spring over the end of each screw and hold the springs in place using a #4

screw retainer.

Use the template below to center-punch or mark pilot holes before drilling.

UV SENSOR MOUNTING HOLES TEMPLATE

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