OTT Pluvio 2 S - Orifice Ring Rim Heater

3.4 Orifice ring rim heater
For the OTT Pluvio
2
S, an optional orifice rim heater is available. This heater
reliably keeps the orifice rim free of snow and ice at low ambient temperatures
(e.g. no snow or ice build-up). No snow will accumulate at the orifice rim.
The orifice rim heater consists of a ring-shaped heating element within the pipe
housing with temperature sensor and an electronic heater control module for con-
t
rolling and monitoring the heating function. The heater cable electrical connection
is established automatically via two plug contacts and a connector block once the
pipe housing is placed onto the base plate.
Only the orifice rim is heated to avoid unwanted losses caused by evaporation.
Therefore, the orifice rim heater does not prevent the contents of the collecting
container from freezing! The heater control unit reliably prevents a stack effect
(errors in precipitation measurement caused by thermal effects) by using a low
and continuously monitored orifice rim temperature.
Orifice rim
Pipe housing
Cable
Orifice rim heater
Plug contacts
Connector block
Fig. 4: Schematic diagram of
the OTT Pluvio
2
S orifice rim heater.
The surface shown in grey (orifice rim)
is the heated part of the pipe housing.
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