GHM Delta OHM HD215 User manual

Operating manual
Tipping bucket rain gauge
HD2015
www.deltaohm.com
English
Keep for future reference.
Companies / Brands of GHM
Miernik opadów atmosferycznych (deszczomierz) HD215 (Delta Ohm) - http://acse.pl

HD2015 - 2 - V1.2
TABLE OF CONTENTS
1 INTRODUCTION .................................................................................................... 3
2 TECHNICAL CHARACTERISTICS ............................................................................ 4
3 INSTALLATION .....................................................................................................
3.1 E LECTR CAL CONNECT ONS ..................................................................................... 6
3.2 T PP NG BUCKET .................................................................................................. 7
3.3 NSTALLAT ON MODES ........................................................................................... 8
4 MAINTENANCE .................................................................................................... 11
5 INSTRUMENT STORAGE ...................................................................................... 13
SAFETY INSTRUCTIONS ...................................................................................... 13
7 ORDERING CODES .............................................................................................. 14

HD2015 - 3 - V1.2
1INTRODUCTION
HD2015 is a reliable and sturdy bucket rain gauge, entirely constructed of corrosion
resistant materials in order to guarantee its durability. To ensure accurate measure-
ments even with low temperature climatic conditions or during and after precipitations
of snow, a version with heating system, automatically activated around +4 °C has
been developed to prevent snow deposits and ice formations.
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 nor-
mally 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, normally closed, open at the moment of the rota-
tion between one bucket’s section and the other. The number of impulses can be de-
tected and recorded by a data logger such as the HD2013-DB or by a pulse counter.
A removable filter for periodic cleaning and maintenance is inserted in the water col-
lector cone so as to prevent leaves or other elements blocking the end of the hole.
For a better water flow, the collecting cone is treated with a non-stick coating.
The version with heating option HD2015R works with 12 Vdc or 24 Vdc direct voltage
(to be specified at the time of order) and absorbs about 50 W. The heating system
is activated around +4 °C.
When submitting your order, it is possible to request a bird dissuader, made of
eight 3 mm diameter spikes, 60 mm in height, to be installed on the rain gauge.

HD2015 - 4 - V1.2
2TECHNICAL CHARACTERISTICS
HD2015R HD2015
Power supply 12 Vdc or 24 Vdc ± 10% / 50 W
(to be specified when ordering) ---
Type of output contact NC contact (opens during tipping)
Resolution 0.1 – 0.2 or 0.5 mm/tip
to be specified at the time of placing the order
Accuracy +2.5…-2.5% in the interval 0…100 mm/h
(version with 0.2 mm @ 50 mm/h nominal resolution)
+1.5…-1.5% in the interval 0…100 mm/h
(version with 0.5 mm @ 50 mm/h nominal resolution)
The error refers to the calculation of the amount of rain using
the resolution stated in the rain gauge label.
f the amount of rain is calculated using the correction curve as
a function of the rainfall rate (fig. 1 and 2), the error is typically
less than ± 2% in the interval 0…200 mm/h.
f the HD2013-DB data logger is used, the measurement can be
automatically corrected according to the graphs in fig. 1 and 2.
Maximum rainfall rate 600 mm/h (version with 0.2 mm nominal resolution)
1000 mm/h (version with 0.5 mm nominal resolution)
Operating temperature range -20 °C ...+70 °C 0 °C …+70 °C
Heating intervention
temperature +4
°C ---
Protection degree P 64
Collector area 200 cm
2
Minimum section of the wires
of the connecting cable
0.5 mm
2
for the version without heating system (HD2015)
2.5 mm
2
for the version with heating system (HD2015R)

HD2015 - 5 - V1.2
Fig. 1 – Normalized resolution (0.2 mm @ 50 mm/h) as a function of the rainfall rate
Fig. 2 – Normalized resolution (0.5 mm @ 50 mm/h) as a function of the rainfall rate
To correct the measurement depending on the rainfall rate, it is necessary to log, in
addition to the number of pulses, also the instants at which the pulses occur.
Example of measurement correction:
Let’s assume that a rain gauge with nominal resolution R
N
= 0.209 mm @ 50 mm/h
has generated 25 pulses at the frequency of 1 pulse every 50 seconds.
The rainfall rate can be estimated considering the nominal resolution R
N
and the inter-
val between two successive pulses: = 0.209 x 3600 / 50 ≈ 15 mm/h.
From the linear equation in fig. 1 we obtain the normalized corrected resolution: R
Cn
=
0.196 mm.
The corrected resolution of the rain gauge is: R
C
= R
Cn
x R
N
/ 0.2 = 0.205 mm.
The amount of rain detected is 25 x 0.205 = 5.125 mm.
Rainfall rate (mm/h)
Normalized resolution (mm)
Rainfall rate (mm/h)
Normalized resolution (mm)

HD2015 - 6 - V1.2
3INSTALLATION
The rain gauge is supplied already calibrated at 0.1 - 0.2 or 0.5 mm of rain per tip of
the bucket: the calibration value is shown on the instrument label.
The instrument must be installed in an open area, away from buildings, trees, etc.,
ensuring that the space above is free from objects which may obstruct the rain meas-
urements and placed in an easily accessible position for periodical cleaning of the fil-
ter.
Avoid installations in areas exposed to wind gusts, turbulences (for example on the
top of a hill) as they may distort the measurements.
The rain gauge can be installed on the ground or 500 mm off the ground. Other sizes
of the support for installation off the ground are available upon request.
For the installation on the floor, three adjustable support feet are supplied, so that the
instrument can be levelled correctly, and also proper holes for a possible fixing on a
floor.
For installations off the ground, a flange to be fixed to the base of the instrument,
where the support clamp must be inserted, is supplied; the clamp ends either with a
flange so that it can be fixed to the floor, or with a tip to be driven into the ground.
For the various fastening systems please refer to the figures 5, 6, 7 and 8.
n order to make the tipping device properly working and the measurements correct,
it is important that the instrument is placed perfectly levelled. The base of the rain
gauge is fitted with a bubble level.
For the installation, unscrew the three screws from the base of the cylinder that sup-
ports the water collector cone (see fig. 2). A heating resistor is placed around the
cone in the HD2015R version. The heater is automatically disconnected when the
cone is lifted up.
3.1 E LECTRICAL CONNECTIONS
For the version without heating system, use a 2-wire cable with 0.5 mm
2
minimum
wires section; for the version with heating system, use a 4-wire cable with 2.5 mm
2
minimum 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 2. The rain gauge output, indicated in point 1 of the drawing below,
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 for the resistors (12 Vdc or 24 Vdc depending on
the version supplied): perform the connection as indicated at point 2 of fig. 3.
f the connections are correctly set, the LED placed near the terminals will be lit up.

HD2015 - 7 - V1.2
Fig. 3 – Electrical connections (version with heating system)
3.2 T IPPING BUCKET
The tipping bucket is locked for the transport of the rain gauge. To unlock the bucket,
remove the holders as shown in fig.4.
Fig. 4 – Locking and unlocking the tipping bucket
The oscillation of the tipping bucket can be adjusted through the two threaded rods
located at the sides of the bucket, as illustrated in fig. 5.
For the
transport
For the
operating
mode

HD2015 - 8 - V1.2
Fig. 5 – Adjustment of the tipping bucket
3.3 I NSTALLATION MODES
274.5
BIRD DISSUADER
FASTENING KNOB
OF THE CASING
GROUND
FLOOR
HD2015.5K
WATER DRAIN
DATA LOGGER
HD2013-DB
COLLAR TO FASTEN
THE DATALOGGER TO
THE SUPPORT STAFF
HD2003.77/40
BASE
FASTENING AND LEVEL
ADJUSTING SCREWS
Æ189.5
Æ160
HD2003.75
HD2003.78
Fig. – Mechanical dimensions, installation modes

HD2015 - 9 - V1.2
120°
M8
M8
D8
M8
M6x25
120°
8.5 mm
(x3) 208 mm
Fig. 7 – Ground installation

HD2015 - 10 - V1.2
M6x12
HD 2003.77/40
M6 x 2 5
M6
M x 2
8 0
HD2003.75
M8
HD2003.78
HD2003.75
M8
D8
HD2015.5K
Fig. 8 – Installation raised above ground

HD2015 - 11 - V1.2
4MAINTENANCE
Verify filters cleanliness periodically; check that there is no debris, leaves, dirt or any-
thing else that might obstruct the flowing of water. Check that the tipping bucket con-
tains no deposits of dirt, sand or any other obstruction. f necessary, the surfaces can
be cleaned with non aggressive detergent.
Fig. 9 – Exploded view of the upper part (version with heating)
1: ring
2: funnel
3: heater
4: housing
5: screw
6: connector
7: contact
8: nut
9: washer
10: gasket
11: birds dissuader
12: nozzle
13: pin
14: tip
15: filter
16: filter support
17: screw

HD2015 - 12 - V1.2
Fig. 10 – Exploded view of the lower part (version with heating)
1: magnet
2: tipping bucket
3: bearing
4: bush
5: spacer
6: screw
7: cover
8: screw
9: nut
10: filter
11: conveyor
12: circuit
13: washer
14: screw
15: contact
16: connector
17: screw
18: cable
19: heater
20: lock nut
21: cable gland
22: junction
23: support
24: screw
25: base
26: bush
27: screw
28: screw
29: washer
30: knob
31: spirit level
32: screw
33: screw
34: support

HD2015 - 13 - V1.2
5INSTRUMENT STORAGE
nstrument storage conditions:
•Temperature: -30...+70 °C.
•Humidity: less than 90 %RH no condensation.
•n storage, avoid places where:
•humidity is high;
•the instrument is exposed to direct sun radiation;
•the instrument is exposed to a high temperature source;
•high vibration levels are present;
•the instrument may be exposed to vapor, salt and/or corrosive gas.
SAFETY INSTRUCTIONS
General safety instructions
The instrument has been manufactured and tested in accordance with the safety
standard EN61010-1:2010 “Safety requirements for electrical equipment for meas-
urement, control and laboratory use” and has left the factory in perfect safety tech-
nical conditions.
The instrument proper operation and operating safety can be ensured only if all
standard safety measures as well as the specific measures described in this manual
are followed.
The instrument proper operation and operating safety can be ensured only in the cli-
matic conditions specified in this manual.
Do not use the instruments in places where there are:
•Corrosive or flammable gases.
•Direct vibrations or shocks to the instrument.
•High-intensity electromagnetic fields, static electricity.
Do not remove the cylindrical cover of the instrument before unplugging the
power cable of the heater.
Ensure that there is the system ground (Protective Earth) and the connecting cable is
in good condition.
User obligations
The instrument operator shall follow the directives and regulations below that refer to
the treatment of dangerous materials:
•EEC directives on workplace safety.
•National law regulations on workplace safety.
•Accident prevention regulations.

HD2015 - 14 - V1.2
7ORDERING CODES
HD2015 Tipping bucket rain gauge, area 200 cm
2
, for temperatures from 0 °C
to +70 °C. Resolution to be specified upon request at the time
of placing the order: 0.1 – 0.2 or 0.5 mm. Output contact normally
closed.
HD2015R Tipping bucket rain gauge, area 200 cm
2
, with heating system for
temperatures from -20 °C to +70 °C. Resolution to be specified
upon request at the time of placing the order: 0.1 – 0.2 or 0.5
mm. Output contact normally closed. Power supply voltage: 12 Vdc
or 24 Vdc ± 10% (to be specified at the time of placing the or-
der) / absorbed power 50 W.
HD2013.18 Bird dissuader.
HD2015.5K Kit of accessories for the installation of the rain gauge raised 500 mm
off the ground and the levelling (mast + rain gauge support).
HD2015.5K.1 Kit of accessories for the installation of the rain gauge raised 1 m off
the ground and the levelling (mast + rain gauge support).
HD2015. 4K Kit of accessories for fixing the rain gauge on the top of the mast and
the levelling (mast + rain gauge support).
HD2003.75 Base with ground tip.
HD2003.78 Flat base for floor fixing.
DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by AC-
CREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acoustics and
Air Velocity. They can supply calibration certificates for the accredited quantities.

GUAR ANTEE
TERMS OF GUARANTEE
All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the
date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty
period, shall be deemed non efficient according to its own judgement. Complete replacement is excluded
and no damage claims are accepted. The DELTA OHM guarantee only covers instrument repair. The
guarantee is void in case of incidental breakage during transport, negligence, misuse, connection to a
different voltage than that required for the appliance by the operator. Finally, a product repaired or
tampered by unauthorized third parties is excluded from the guarantee. The instrument shall be returned
FREE OF SHIPMENT CHARGES to your dealer. The jurisdiction of Padua applies in any dispute.
The electrical and electronic equipment marked with this symbol cannot be disposed of in public
landfills. According to the Directive 2011/65/EU, the european users of electrical and electronic
equipment can return it to the dealer or manufacturer upon purchase of a new one. The illegal
disposal of electrical and electronic equipment is punished with an administrative fine.
This guarantee must be sent together with the instrument to our service centre.
IMPORTANT: Guarantee is valid only if coupon has been correctly filled in all details.
Instrument Code: 
HD2015  HD2015R
Serial Number
RENEWALS
Date Date
Inspector Inspector
Date Date
Inspector Inspector
Date Date
Inspector Inspector

GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone [phone] | Fax [phone]
www.deltaohm.com | [email protected]
The quality level of our instruments is the result of the constant development of the product. This may
produce some differences between the information written in this manual and the instrument you have
purchased. We cannot completely exclude the possibility of errors in the manual, for which we apologize.
The data, images and descriptions included in this manual cannot be legally asserted. We reserve the
right to make changes and corrections with no prior notice.

GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY
Phone [phone] | Fax [phone]
www.deltaohm.com | [email protected]
V1.2
01/04/2020