Product # 7841, 7843, 6490
UV S
ENSOR
F
OR STANDARD
,
I
NDUSTRIAL
, & V
ANTAGE
P
RO
W
EATHER STATIONS
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 provides 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 har d-oxide coatings, the filter pr ovides 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.
Page 2 UV Sensor
M
OUNTING
H
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
T
OOLS
AND
M
ATERIALS
N
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 Page 3
C
ONTENTS
S
PECIFICATIONS
ARE
A
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/
S
TANDARD
AND
I
NDUSTRIAL
V
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.............................. 3
Testing the Sensor.......................................................................... 3
Installing the Sensor....................................................................... 4
Typical Standard Installation......................................................... 4
Typical Industrial Installation........................................................ 5
Mounting on the Sensor Mounting Arm......................................... 6
Mounting on the Sensor Tilting Bracket........................................ 7
Mounting on a Wood Surface.......................................................... 10
Routing Sensor Cable..................................................................... 10
Vantage Pro Version: Installation on the Sensor Mounting Shelf.. 12
Testing the Sensor.......................................................................... 12
Accessing the SIM........................................................................... 12
Securing the Sensor on the Shelf.................................................... 13
Routing Sensor Cable..................................................................... 14
If You Are Going to Install the Solar Radiation Sensor................. 15
Maintaining the Sensor.................................................................. 15
Technical Support.......................................................................... 16
Page 4 UV Sensor
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 sensor 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).
T
YPICAL
S
TANDARD
I
NSTALLATION
Standard and Industrial Versions: Installation Page 5
Typical Industrial Installation
The illustration below shows typical industrial UV installation. The sensor
cable attaches to connector S3 on the sensor interface module (SIM).
T
YPICAL
I
NDUSTRIAL
I
NSTALLATION