DAVIS UV Sensor User Manual

Product # 7841, 7843, 6490
UV S
ENSOR
F OR S TANDARD ,
I
NDUSTRIAL
, & V
ANTAGE
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EATHER
S
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.

DAVIS UV Sensor Specifications

General

Brand	DAVIS
Model	UV Sensor
Category	Accessories
Language	English

Summary

Mounting Hardware

Tools and Materials Needed

Specifications Are Available

Standard and Industrial Versions: Installation

Testing the Sensor

Verifies UV sensor operation by connecting it to the system and checking readings.

Installing the Sensor

Provides general guidance on sensor mounting, recommending alignment for optimal UV measurement.

Typical Standard Installation

Illustrates the standard installation procedure, including cable connection to the SIM.

Typical Industrial Installation

Details the typical installation process for industrial UV sensor applications.

Mounting on the Sensor Mounting Arm

Step-by-step instructions for attaching the UV sensor to a standard mounting arm.

Mounting on the Sensor Tilting Bracket

Guide for mounting the UV sensor using a specialized tilting bracket for specific angles.

FINAL SENSOR POSITIONING

Instructions for precise sensor alignment using leveling screws and alignment fins.

Mounting on a Wood Surface

Procedures for securely mounting the UV sensor onto a wooden surface using provided hardware.

Routing Sensor Cable

Best practices for securing and routing sensor cables outdoors to prevent damage from wind.

Vantage Pro Version: Installation on the Mounting Shelf

Testing the Sensor

How to test the UV sensor's functionality with the Vantage Pro Integrated Sensor Suite (ISS).

Accessing the SIM

Steps to remove radiation shield plates to access the Sensor Interface Module (SIM).

Securing the Sensor on the Shelf

Instructions for firmly attaching the UV sensor to the ISS mounting shelf.

Routing the Sensor Cable

Guide for managing the sensor cable within the rain collector base to avoid interference.

If You Are Going to Install the Solar Radiation Sensor

Advice on installing a solar radiation sensor concurrently with the UV sensor.

Reassembling Radiation Shield

Detailed steps for reassembling the radiation shield after sensor installation.

Maintaining the Sensor

Procedures for cleaning the sensor's diffuser and guidelines for calibration.

Technical Support