GHM Delta OHM HD2013, Operating Manual, Page: 7 / 32

HD2013
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V1.6
3 INSTALLATION
The rain gauge is supplied already calibrated and the calibration value (resolution) is
shown on the instrument 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 measure-
ments, 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 requested in the version for ground installation or for installa-
tion raised above the ground.
For ground installation, three adjustable support feet, so that the instrument can be
levelled correctly, and holes for fixing to the floor have been provided.
For installation raised above the ground, insert the flange at the base of the instru-
ment in the support mast. At the opposite end, the mast 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 the figures 3.7, 3.8 and 3.9.
For the tipping device to function correctly and so for the measurement to be correct,
it is important that the instrument is placed perfectly levelled. The base of the rain
gauge is fitted with a bubble level.
For installation, unscrew the three screws at the base of the cylinder that supports the
water collector cone.
Attention
: a heating resistor is fitted around the cone in the heated version. To dis-
connect the cone heater, unplug the connector on the upper side of the terminal block
protection cover (see fig.3.1).
3.1 E
LECTRICAL CONNECTIONS
For the version without heating use a 2-wire cable with 0.5 mm
2
minimum wires sec-
tion , for the version with heating use a 4-wire cable with 2.5 mm
2
minimum wires sec-
tion .
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
the following figures.
Connection of heating:
The heated version requires power (12 Vdc or 24 Vdc depending on the version sup-
plied) for the resistors: perform the connection as indicated at point 2 of fig. 3.1.
If the connections are set correctly, the LED placed near the terminals will be lit up.
Connection of contact output:
The rain gauge contact output, indicated at point 1 in the figure 3.1, must be con-
nected 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 .
To use the contact output in the versions with analog or SDI-12 output option, set the