RAIN DETECTOR, Merk : DeltaOhm[11 Nov. 2009, 1:10:17]
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DESCRIPTION
The HD2013.2 is a rain detector based on the capacity principle. The capacity value of the
sensitive element, on an alumina rest, changes according to the surface dampened by
raindrops. An integrated heater keeps it dry, evaporates water and prevents false signals
caused by fog or dew. The heater also activates at low temperatures, melting the snow
and allowing to detect snow precipitations. The instrument external circular dome acts
as a windshield for the sensor, preventing false indications. The instrument is equipped
with three different outputs: a â Rain ON/ OFFâ output, which detects whether it is raining/
snowing ( ON) or not ( OFF) , also used to control a relay coil or similar devices; a 0⦠1V
voltage analogue output ( calibrated) and a 1, 5⦠6KHz frequency output ( not calibrated) ,
which provide an accurate indication of current precipitation intensity. The ON/ OFF output
comes with a delay circuit that indicates the â rain overâ condition with a 2 minute delay, so
that the â rain overâ condition is distinguished from the â light rainâ one. The heater can be
disabled when power consumption is critical. To do it, set the Heater OFF input on 0V.
If requested when ordering, a bird spike, consisting of a 6-spike ring ( spike height: 60mm,
diameter: 3 mm) , can be mounted.
Typical Applications
The rain detector can be used either as a separate device, or connected to a data logger
system ( for example: in a weather station) . In fi gure 1, the HD2013.2 ON/ OFF output is
connected to a relay coil that powers an engine: should it rain, the ON/ OFF output will
energize the relay coil, which will close the normally open contact ( in this case the rain
detector is employed as part of a control system, such as, for example, for closing windows) .
Warning: when the HD2013.2 is connected to a relay coil, use always a protection diode,
as shown in fi gure 1.
Installation and Maintenance
Place the detector far from buildings, trees, etc⦠, taking care that no object is over the
detector, as it might prevent rain detection. Use the supplied accessories to mount the
instrument; the bracket can be fi xed to a post having a diameter from 30 to 50mm; the post
can be either horizontal or vertical thanks to the bracket double drilling. A standard 5-m
cable is supplied for the electrical connection with an IP68 connector to be inserted at the
bottom of the instrument: the colours of the leads and the relating functions are to be found
in the technical specifi cations. To ensure good immunity from noises, it is recommended to
connect the cable braid to the earth and to keep the heater and the electronics earth leads
separate. Clean the sensor regularly with a cotton fl ock soaked in distilled water; in case of
ingrained dirt, mild cleansers can be used in moderation.
The sensor is fragile, as it is placed on an alumina rest, thus handle it with care!
Technical Data/ Specifi cations
Sensor
Type Capacitive, with integrated heater
Sensor 6.6cm2
Angle 30°
Sensitivity
Min. sensitive area 0.05cm2
ON delay/ Trip delay ( OFF> > ON) > OFF) < 5min
Dimensions
Diam. x height ø 107 x 70 mm
Weight 450g
Cable length 5m ( other lengths available on request)
Material BASF LURAN S777K
Electrical Features
Power Supply
Supply Voltage 12Vdc ± 10%
Current Consumption 130mA ( typical)
230mA ( max)
10mA ( with heater disabled)
Sensor Power Consumption 0.5 ⦠2.3W
Outputs
Rain ON/ OFF Open collector, closed in case of rain.
Max. Voltage 15V
Max. Current 50mA
Analogue Output 0⦠1V ( 0V = rain, 1V = dry sensor)
Frequency Output 1500 ⦠6000Hz ( rain ⦠dry sensor) Not
calibrated
Inputs
Heater OFF OFF = connected to GND
Closing Contact Capacity 15Vdc, 2mA
Ambient Conditions
Operating Temperature -15 ⦠+ 55° C
Storage Temperature -40 ⦠+ 65° C
Electrical Connection â Colour Codes
Power supply ( + ) Red
Rain ON/ OFF Blue
Heater OFF Green
Analogue Output Yellow
Frequency Output White
Electronics Earth Black
Heater Earth Grey
Ordering Codes
HD2013.2: Rain detector equipped with mounting bracket. 8-pole connector output
according to IEC 60130-9 IP68. Complete with fl ying female connector. Connection
cable has to be ordered separately.
CP2013.2.5: 5-m connection cable: 8-pole IEC 60130-9 IP68 female connector on one
end. Other lengths available on request.
HD2013.2D: â Bird spikeâ , consisting of a 6-spike ring ( spike height: 60mm, diameter: 3
mm) , to be expressly requested when ordering.
