5 Installing the OTT Pluvio
2
S
The installation of the OTT Pluvio
2
S is carried out on a 2" pedestal made of gal-
vanized steel (possible external diameter of pedestal 50 to 60.3 mm). The pedestal
must be securely attached to a concrete foundation having the appropriate dimen-
sions. The pedestals that are available from OTT as accessories are fitted with a
bottom plate designed for this purpose.
The standard installation height recommended by the World Meteorological
Organization, WMO, for precipitation gauges is 1 meter (height of bucket
orifice). Alternatively, an installation height of 1.2 or 1.5 m is allowed.
Carefully choose your setup location according to your meteorological require-
ments. At the same time, ensure the location is free of vibration. For example,
traffic on a nearby road can affect the measurement results through vibration.
T
he maximum distance to the data collection device and the power supply to
which the OTT Pluvio
2
S is to be connected depends on the interface used:
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SDI-12 interface: 70 meters
䊳
RS-485 interface: 1000 meters
䊳
Pulse output: 1000 meters
For an OTT Pluvio
2
S with orifice rim heater, the maximum distance to the mains
adapter of the orifice rim heater is 125 meters.
Please note: The OTT Pluvio
2
S precipitation gauge is equipped with a highly
sensitive electronic weighing mechanism! Install the unit only as described in these
Operating Instructions. To avoid damage to the OTT Pluvio
2
S weighing mecha-
nism during installation: Avoid heavy shocks and large forces acting on the load
cell and the bracket for the bucket support (for these items, please refer to Fig. 8)!
5.1 Recommended cable types/maximum cable lengths
For operating the OTT Pluvio
2
S, the following connections have to be made:
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power supply for the precipitation gauge,
䊳
power supply of the orifice rim heater (optional),
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data collection device (SDI-12/RS-485 interface, pulse output),
䊳
ground terminal.
For the precipitation gauge power supply and the connection of the data collec-
tion device, a common connection cable can be used.
For an OTT Pluvio
2
S with orifice rim heater, an additional connection cable may
be used (alternatively two additional wires in the common connection cable).
Benefit: The orifice rim heater can be switched on and off separately from the pre-
cipitation gauge. In addition, power consumption of the orifice rim heater requires
a larger wire cross-section to be used for longer connection cables.
In total, the connection area of the OTT Pluvio
2
S has two cable entrances (rubber
grommets).
Please note: The protection concept of the OTT Pluvio
2
S against overloads
is designed such that all overvoltages occurring are discharged via a ground
connection. For this, the proper and functional installation of a grounding cable is
absolutely necessary! This is connected to the OTT Pluvio
2
S at the ground terminal
and at the other end in the area of the data collection device or directly at the
OTT Pluvio
2
S to a concrete footing ground or ground rod.
16
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