Data Sheet

HD2021T...
The series of transmitters HD 2021T… allow to convert photometric and
radiometric quantities, such as illuminance (Lux) and irradiance (W/m
2
) in the
UVA, UVB, UVC spectral regions and in the 400 ... 1050nm band, into a 0 ...10Vdc
voltage signal. The 0 ... 10 V output voltage (0...1V, 0...5V, 4...20mA available
upon request for orders of minimum 5 units) is factory calibrated according to
the full scale range specifi ed at the time of order. The wide range of applications
of the HD2012T… transmitters include:
• Control of illuminance (HD 2021T…) in offi ces, manufacturing plants and
production areas, commercial sites, theatres, museums, sports facilities,
roadway lighting, tunnels and nursery-gardening systems.
• Control of solar radiation in the 400nm...1050nm spectral band (HD 2021T1).
• Control of the irradiance emitted by the tanning lamps in the UVA (HD 2021T2)
and UVB (HD2021T3) spectral regions, as well as control of the effi ciency of
fi lters in devices using high pressure lamps.
• Control of the effi ciency of the lamps used in sewage treatment plants, where
UVC (HD2021T4) band irradiance has to be constantly monitored.
The series of transmitters HD2021T... is suitable to be installed either
indoor and outdoor (Protection: IP66). In case of measurements of extremely
intense light sources, the transmitter sensitivity can be reduced upon request.
The HD 2021T… series use fi lters and photodiodes especially studied to adjust
spectral response to a specifi c region of interest.
INSTALLATION OF THE TRANSMITTERS
Once identifi ed the installation location, provide the electric connections inside
the transmitter. Unscrew the four screws on the transmitter cover, lift the cover,
the inside of the transmitter is as in Figure 1.
The terminal, easily identifi able, is equipped with three terminals with the
following letters:
GND ➔ is the mass to which the power supply and the output signal are referred
+Vdc ➔ is the head connected to the positive pole (if a DC power supply is used)
Vlux (output) ➔ is the output of the system to be connected to the positive pole
of a multimeter or to a data acquisition system.
The sample below shows the installation of illuminance HD2021T transmitter for
monitoring lamps intensity. For this kind of applications, the HD2021T transmitters
are generally installed on ceilings, close to the area where illuminance needs to
be monitored (fi gure 2). By means of a reference Luxmeter (ex. HD2102.1 o
HD2102.2 with the probe LP471PHOT) previously placed in the operating area,
act on the HD2021T potentiometer up to obtain the reference value desired. The
output of the HD2021T is suitable to control several adjustable power supply
units at the same time.
HD2021T…
TRANSMITTERS FOR ILLUMINANCE AND IRRADIANCE
MEASUREMENTS.
+
-
+
V out
V lux (W/m
2
)
GND
+Vcc
+Vcc
V lux
GND
Sensitivity potentiometer.
Connect the cable shield to GND
Output signal
Vac/dc
Power supply
HD2021T
LAMPADE
LAMPS
LAMPES
LAMPEN
LÁMPARAS
Access hole for sensitivity adjustment.
fi g . 1
fi g . 2
+
-
+
V out
V lux (W/m
2
)
GND
+V cc
+Vcc
V lux
GND
- Potenziometro di regolazione della
sensibilità.
- Sensitivity potentiometer.
- Potentiomètre de réglage de la sensibilité.
- Potentiometer zur Empndlichkeitsreglung.
- Potenciómetro de regulación de la
sensibilidad.
Connettere lo schermo del cavo a GND
Connect the cable shield to GND
Relier la protection du câble à CND
Kabelschirm ist mit GND zu verbinden
Conectar la armadura del cable a GND
Segnale di uscita
Output signal
Signal de sortie
Ausgangssignal
Señal de salida
Vac/dc
Power
Supply
H D 2 021T
LAMPADE
LAMPS
LAMPES
LAMPEN
LÁMPARAS
- Foro di accesso per la regolazione della
sensibilità.
- Access hole for sensitivity adjustment.
- Ouverture d’accès pour le réglage de la
sensibilité.
- Zugang zur Empndlichkeitsregelung
- Oricio de acceso para la regulación de la
sensibilidad.