Medidores y Sensores UV
	MEDIDOR ULTRAVIOLETA (modelo UVM) This meter measures the UV radiation between 250 and 400 nanometers, and is measured in µmol m^-2 s^-1 (micromoles of photons per square meter second). ESPECIFICACIONES
	SENSOR ULTRAVIOLETA (modelo UVS) UV sensor in PVC body with 2 meters of cable ending in pigtail leads.  For use in data acquisition device.   Calibration certificate provided. ESPECIFICACIONES
	MEDIDOR ULTRAVIOLETA CON SENSOR SEPARADO (modelo UVM-SS) UV sensor attached to hand-held meter with 2 meters of cable. ESPECIFICACIONES

CALIBRACION

The photon flux of UV radiation (250 to 400 nm) can be expressed as a percentage of the Photosynthetic Photon Flux (PPF; 400 to 700 nm). The unit for both UV and PPF is µmol m^-2 s^-1. The total photon flux of UV radiation from sunlight is close to 8.5 % of the PPF in sunlight. The photosynthetic photon flux at noon in full sunlight is about 2000 µmol m^-2 s^-1 and the photon flux of UV radiation is about 170 µmol m^-2 s^-1. UV meters and sensors are calibrated in sunlight against a LI-COR spectroradiometer.

UTILIZACION DEL MEDIDOR UV

1.  Turn the dial to the "ON" position.
2.  Hold the meter so that the sensor surface on the top is horizontal.
3.  Hold the meter at eye level to avoid shading the sensor with your head.
4.  The number in the display is the UV radiation in units of µmol m^-2 s^-1.
5.  Turn the meter off after use to conserve battery power.

TOMA DE MEDIDAS
Our meters offer good accuracy at a low cost, but the user should be aware of potential sources of error. The biggest error is often caused by small changes in the position of the meter. The sensor on the top of the meter must be exactly horizontal for the most accurate measurement.  The correct position for making a measurement is shown at right.

SENSIBILIDAD DEL SENSOR UV

PORQUÉ ESTE SENSOR NO PUEDE MEDIR RADIACION UV-B SELECTIVA Our spectroradiometer measurements confirm those of other people and indicate that less than 0.4 % of the photon flux in sunlight falls below 320 nm; 2.3 % falls between 320 and 350 nm, and 6% falls between 350 and 400 nm. Although the UV radiation between 250 and 320 nm is critically important in photochemical and photobiological reactions, only about 5% of the UV photons nm are in this range. Because only a small fraction of the photons are in the UV-B range, this meter thus cannot be used to selectively measure UV-B radiation (280-320 nm). The meter is sensitive to UV-B radiation, but it is included with the UV-A radiation to provide a total measurement of UV radiation.

FACTORES DE CONVERSION
Los modelos de medidor de mano muestran la Radiación UV en µmol m-2 s-1. Los Sensores se conectan a un multímetro o registrador de datos. The sensor uses a photodiode to yield a millivolt output. This output is multiplied by a conversion factor to yield UV radiation in units of µmol m-2 s-1. The calibration factor is approximately 6.5 (0.15 mV per µmol m-2 s-1), but is sensor specific.

RESPUESTA DEL COSENO

Parte de la radiación que entra en un sensor a bajos ángulos se refleja, lo cual causa que la lectura sea menor de lo que debiera. Para corregir parcialmente este problema, los sensores a menudo se encapsulan dentro de un cilindro negro con un pequeño disco transparente que sobresale. Esta cabeza corregida en coseno permite capturar la radiación que entra en ángulos bajos.

El sensor UV queda corregido en los medidores de mano por su particular construcción, al disponer de una junta en el borde del sensor lo cual permite capturar la cantidad adecuada de luz angular.

El error de coseno para aplicaciones típicas es menor del 1%.

RESPUESTA DE TEMPERATURA

Increasing temperature increases the output of most radiation sensors. This meter was calibrated at 20°C. Our measurements indicate that the temperature error is less than 3% between 10 and 30°C. The temperature error is insignificant for most applications.

ESTABILIDAD A LARGO PLAZO

The output of all radiation sensors tends to decrease over time as the detector ages. We recommend returning the meter or sensor for recalibration every 3 years.

CALIBRACION Both models UVM and UVM-SS include a potentiometer that can be used to change the calibration. Please contact EIC if you would like the meter recalibrated. Do not attempt recalibration without a radiation standard.  Model UVS (sensor only version) is calibrated to provide approximately 0.1 mV per µmol m^-2 s^-1.  Calibration certificate provided.

ESPECIFICACIONES DEL MEDIDOR

DISPLAY	3 1/2 digit LCD, 1.2 cm height.
OPERATING ENVIRONMENT	0 to 50 °C. Less than 80% relative humidity up to 30 °C; Less than 70% RH from 30 to 50 °C
ALIMENTACION	Standard 9V battery. Battery life is typically 100 hours with the carbon-zinc battery (included) and 200 hours with an alkaline battery. The letters "BAT" appear in the display when the battery needs to be replaced. To replace the battery, remove the 2 screws in the back of the case and carefully lift off the back. Observe polarity of the battery contacts.
DIMENSIONES	126 x 70 x 24 mm
PESO	140 g
RANGO	0 to 199.9 µmol m^-2 s^-1 (amount of UV in full sunlight = 170.0 µmol m^-2 s^-1)
WARRANTY	1 year parts and labor

ESPECIFICACIONES DEL SENSOR

ENTORNO OPERATIVO	-40 to 55 °C;  0 to 100% relative humidity.  Designed for continuous outdoor use.  Can be submerged underwater.
SALIDA	Approximately 0.1 mV per µmol m^-2 s^-1 (calibration certificate provided).
DIMENSIONES	24 mm diameter, 25 mm tall.
LONGITUD DEL CABLE	Standard: 2 m cable with pigtail leads Additional cable can be built in.
RANGO	0 to 400.0 µmol m^-2 s^-1 (amount of UV in full sunlight = 170.0 µmol m^-2 s^-1)
GARANTIA	1 year parts and labor.

Equipos  Instrumentación  y  Control  S.L.

Urbanización Prado Norte, c/ Fresno  1 – bis  28110 Algete – MADRID

Telf.: 91 628 0817  Fax: 91 628 0453  Email: info@eiccontrol.com

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