Delta OHM HD 2013 Series User manual

HD 2013
Environmental analysis
EA-73
The HD2013 is a reliable and sturdy bucket rain gauge, built entirely from
corrosion resistant materials in order to guarantee its durability. So as to ensure
accurate measurement even with low temperature climatic conditions or during
and after precipitations of snow, a version with a heater which is automatically
activated around +4°C has been developed so that snow deposits and ice
formations are prevented.
The rain gauge is formed by a metal base on which a tipping bucket is set. The
rain collector cone, fixed to the aluminium cylinder, channels the water inside
the tipping bucket: once the predefined level is reached, the calibrated bucked
rotates under the action of its own weight, discharging the water. During the
rotation phase, the usually closed reed contact opens for a fraction of a second,
sending an impulse to the counter.
The quantity of rainfall measured is based on the count of the number of times
the bucket is emptied: the reed contacts, usually closed, open at the moment
of the rotation between one bucket’s section and the other. The number of
impulses can be detected and recorded by a datalogger such as the DeltaOhm
HD2013-DB or by a pulse counter.
A removable filter for periodic cleaning and maintenance is inserted in the water
collector cone so as to prevent leaves or other elements blocking the end of the
hole. For better water flow, the collector cone is treated with a non-stick paint.
The HD2013R, the version with a heater, operates using either 12Vdc or 24Vdc
voltage (to be specified in the order) and uses about 165W. Heating is activated
around +4°C.
When submitting your order, upon request a bird dissuader, made of 8 3mm-
diameter spikes, 60 mm in height, can be installed on the rain gauge.
HD2013
TIPPING BUCKET RAIN GAUGE
Fig. 2 Mechanical dimensions, installation systems
Electrical connectionsInside view
L = 0.5m, 1m, 2m
FLAT BASE BASE
WITH TIP
Fig. 1 Electrical connections
24Vdc 24Vdc12Vdc 12VdcJUMP JUMP
GND GND
4 43 32 2
1 1
12Vdc
24Vdc
123 4 5 6
COVER
FAIRLEAD

0,191
0,194
0,197
0,200
0,203
0,206
0,209
0,212
0 25 50 75 100 125 150 175 200
EA-74
INSTALLATION AND MAINTENANCE
Upon request the rain gauge can be supplied ready calibrated at 0.2mm of rain
per commutation of the bucke (upon request, 0.1 or 0.5 mm calibration can be
provided ): the calibration value is shown on the instrument’s label.
The instrument must be installed in an open area, away from buildings, trees,
etc…, ensuring the space over it is free from all objects which could obstruct
rain measurements, and in an easily accessible position for the filter to be
cleaned periodically.
Avoid installation in areas exposed to gusts of wind, turbulence (for example the
top of a hill) as these may distort the measurements.
The rain gauge can be installed on the ground or raised 0.5 m, 1m or 2m above
the ground.
Three adjustable support feet have been provided for ground installation so that
the instrument can be levelled correctly, and the holes aligned so that it can be
fixed to the floor.
For raised installations a collar has been provided which fastens around the
base of the instrument on which the support staff must be inserted. The staff
may end with either a flange so that it can be fixed to the floor, or a tip to be
driven into the ground. The various fastening systems can be seen in fig. 2.
For the tipping device to function correctly and so for the measurement to be
correct, it is important that the instrument is placed perfectly level. The base of
the rain gauge is fitted with a bubble level.
For installation, unscrew the three screws at the sides of the cylinder that
supports the water collector cone.
Note: a heating resistor is fitted around the cone vertex in the HD2013R version.
To disconnect the power leads, the terminal block’s protection cover must be
removed and the connector plugged into the heater’s leads coming from the
cone needs disconnecting (see fig. 3).
Electrical connection
For the version without heating use a 2-wire cable with 0.5 mm2minimum wires
section, for the version with heating use a 4-wire cable with 2.5 mm2minimum
wires section. Use a shielded cable over long distances. Slide the cable through
the cable gland and fasten it with the cable fastener located near the entry hole
at the base of the rain gauge. Unscrew the terminal block protection cover and
perform the connections as shown in figure 3. The rain gauge output, indica-
ted at point 1 in the figure, must be connected to the input of the HD2013-
DB rain gauge data logger (please see the details in the manual of the data
logger) or to a pulse counter or to a data logger.
The heated version requires power (12 Vdc or 24 Vdc depending on the version
supplied) for the resistors: perform the connection as indicated at fig. 1.
If the connections are set correctly, the LED placed near the terminals will be
lit up.
+Vdc
GND
LED
Connector with
cone heater
Fig. 3 – Electrical connections (version with heating option)
Maintenance
Verify filter cleanliness periodically; check that there is no debris, leaves or
anything else that might obstruct the passage of water.
Check that the tipping bucket contains no dirt, sand, … deposits, or any other
obstruction.
If necessary, the surface can be cleaned with mild non aggressive detergent.
Technical characteristics
HD2013R HD2013
Power 12Vdc or 24Vdc ±10% / 165W
(to be specified in the order) ---
Type of output contact NC contact (opens during commutation)
Resolution 0.1 - 0.2 or 0.5 mm/commutation
(on request at the time of placing the order)
Precision
See normalized curve in fig.4. The curve is normalized at
0.2mm /commutation@50mm/h. If HD2013-DB data logger
is employed, the measure can be automatically normalized
according to this curve.
Operating temperature
range -20°C ... +60°C +4°C … +60°C
Heater intervention
temperature +4°C ---
Protection degree IP64
Collector area 400 cm2
Minimum sections
of the wires of the
connection cable
0,5mm² for the version without heating (HD2013)
2,5mm² for the version with heating (HD20123R)
Rain gauge with bird dissuader.Rain gauge installed on the ground.
Resolution (mm/commutation)
Rain intensity
Fig. 4 Resolution according to the rain intensity

Environmental analysis
EA-75
ORDER CODES
HD 2013: Rain gauge with tipping bucket, area 400cm2, for temperature range
+4°C… +60°C. Resolutions to be specified at order 0.1, 0.2 or 0.5 mm.
Output contact normally closed.
HD 2013 R: Rain gauge with tipping bucket, area 400cm2, equipped with heater
for temperature range –20°C…+60°C. Resolutions to be specified at order
0.1, 0.2 or 0.5 mm. Output contact normally closed. Power voltage 12Vdc
or 24Vdc ± 10% / power absorption 165W.
HD 2013.18: Bird spike.
HD 2003.5K: Accessory kit for the installation of the rain gauge raised 500 mm
from ground, formed by water collection cup with threaded shaft for sup-
port bar L = 500 mm.
HD 2003.5K1: Accessory kit for the installation of the rain gauge raised 1 m
from ground, formed by water collection cup for the rain gauge, support
bar L = 1 m.
HD 2003.5K2: Accessory kit for the installation of the rain gauge raised 2 m from
ground, formed by water collection cup for the rain gauge, support bar L
= 2 m, accessories HD2003.75K for bracing the mast for installation with
pegs on the ground.
HD 2003.5K3: Accessory kit for the installation of the rain gauge raised 2 m
from ground, formed by water collection cup for the rain gauge, support
bar L = 2 m, accessories HD2003.78K for bracing the mast for installation
on the floor.
HD 2013L: Device for levelling the rain gauge when it is installed on a support
bar. The adjustment is performed by means of fine pitch screws.
HD 2003.75: Flange with tip for the ground to support the raised from the ground
rain gauge (to add to the accessory kits HD2003.5K…).
HD 2003.78: Level base for fastening the raised from the ground rain gauge (to
add to the accessory kits HD2003.5K…).
HD 2003.77/40: Clamping to fasten the data logger HD2013-DB to the support
staff
Bubble level
Support plate for rain gauge raised from
ground
Base for ground fastening HD2013.78
Tip for ground for rain gauge raised from
ground
130
180
80
180 140
55
Ø
9 (X3)