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UV-2 SERIES
FEATURES
• Spectral response: 185÷260 nm
• Peepsight connection: Ø 3/4” gas
• Discharge starting voltage: (with UV radiation) 280V
• Recommended oper. voltage: 325 ±25V
• Max. voltage: 400V
• Recommended discharge current: 100μA
• Average discharge current (note A): 1mA
• Max. peak current (note B): 30mA
• Operating temperature -20÷60°C
• Background (note C): max. 10 cpm
• Sensibility (note D) 5,000 cpm (> 1pW)
• Life service with continuous discharge > 10,000 hours
DESCRIPT
The UV2 is a flame detector for industrial use installed in a robust,
die-cast aluminium box, equipped with plug in connection and
threaded connection for the peepsight. It contains a gas filled UVtube.
UV-rays (not daylight or artificial light from discharge or
filament lamps) ionise the gas in the tube. Figure 1 shows the curb of
the spectral response. The UV2 may be used either with all the
electronic systems ESA produces or with any other system provided
the tube is operated within its limits.
CAUTIONS AND WARNINGS
• The housing of the photo-tube should be covered. During flame
detection the tube itself produces ultra-violet radiation which could
be captured by others photo-tubes.
• The detector is also sensible to ultra-violet radiation produced by
the crown effect.
• The UV2 is built in accordance with MIL-STD-202F (method
240DO.06" or 10g, 10-500Hz, 15 minutes, 1 cycle) and MIL-STD-
202F (method 213B/100g, 11ms, semiwave, 3 events).
A strong mechanical stress (fall) could damage the quartz bulb of
the detector, empairing its performances or causing it to be
useless. Take care when holding the UV2.
• Humidity within the housing, as well as dust or dirt within the field
of vision of the photo-tube could cause losses of signal.
• Use only unipolar cables.
NOTES
A If the detector is operated with the recommended current for long,
its service life is noticeably reduced. Use the detector within the
recommanded current values.
B This is the maximum momentary current that can be handled if its
full width at half maximum is less than 10 μs.
C Measured under room illuminations (approximalety 500 lux) and
recommanded operating conditions. Note that these values may
increase if the following factors are present:
mercury lamps, sterilizing lamps or halogen lamps located nearby;
electrical sparks (also from ignition transformer); radiation
sources; intense electric fields (including static fields) generated
across the probe. It is advisable to ground the housing of the
detector (not only for greater safety and because the regulations
prescribes it) via the plug in connection.
D These are rapresentative values for a wavelenght of 200 nm and
a light input of 10 pW/cm2. In actual use, the sensibility will vary
with the wavelenght of the ultraviolet radiation and the drive
circuitry employed.
ELECTRICAL WIRING IS MARKED ON THE HOUSING, REVERSED POLE
CONNECTION DOES NOT DAMAGE THE DETECTOR BUT DOES NOT EMIT
A USEFUL SIGNAL EITHER.