Delta OHM HD 2013.2 Manual Del Usuario página 3

HD2013.2 RAIN DETECTOR
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 "Rain ON/OFF" 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 "rain over" condition with a 2 minute delay, so that the "rain over"
condition is distinguished from the "light rain" 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 figure 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 figure 1.
The HD2013.2 is part of a weather station data logger system: the voltage output
of the different devices has to be connected to the data logger (and/or controller)
analogue input, in order to be processed. Figure 2 shows the example of a weather
station using Delta Ohm instruments with voltage inputs, specific for weather.
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 fixed
to a post having a diameter from 30 to 50mm; the post can be either horizontal
or vertical thanks to the bracket double drilling. Figure 3 shows dimensions and
position of the bracket fixing holes.
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 specifications. 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 flock 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!
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Fig.3
Technical Data/Specifications
Sensor
Type
Sensor
Angle
Sensitivity
Min. sensitive area
ON delay/Trip delay (OFF>>ON)
OFF delay/Shut-off delay (ON>>OFF)
Dimensions
Diam. x height
Weight
Cable length
Material
Electrical Features
Power Supply
Supply Voltage
Current Consumption
Sensor Power Consumption
Outputs
Rain ON/OFF
Max. Voltage
Max. Current
Analogue Output
Frequency Output
Inputs
Heater OFF
Closing Contact Capacity
Ambient Conditions
Operating Temperature
Storage Temperature
Electrical Connection – Colour Codes
Power supply (+)
Rain ON/OFF
Heater OFF
Analogue Output
Frequency Output
Electronics Earth
Heater Earth
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Capacitive, with integrated heater
6.6cm2
30°
0.05cm2
< 0.1ms
< 5min
ø107 x 70 mm
450g
5m (other lengths available on request)
BASF LURAN S777K
12Vdc ± 10%
130mA (typical)
230mA (max)
10mA (with heater disabled)
0.5 ... 2.3W
Open collector, closed in case of rain.
15V
50mA
0...1V (0V = rain, 1V = dry sensor)
1500 ... 6000Hz (rain ... dry sensor) Not
calibrated
OFF = connected to GND
15Vdc, 2mA
-15 ... +55°C
-40 ... +65°C
Red
Blue
Green
Yellow
White
Black
Grey
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