Lambrecht rain[e]H3, User Manual

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User Manual
Precipitation Sensor rain[e]H3 with Ethernet
Id-No. 00.15184.540 020
rain[e]H3 Precipitation Sensor Manual
5 Introduction
The precipitation sensor rain[e]H3 measures precipitation amount and intensity. The rain[e]H3 combines the
advantages of the latest weighing technology and a self-emptying system, allowing a high resolution and high
precision at a very small total volume. Therefore the rain[e]H3 has a higher resolution and precision than common
tipping bucket sensors and at the same time is much smaller than common weighing sensors, since there is no
need for a collecting container.
The main sensor is a highly precise load cell with overload protection. Its temperature coefficient can be determined
using a temperature sensor in the interior space if necessary. The pulses from the reed contact generated by tipping
the collecting vessel are used for error correction during periods of high intensity precipitation. Furthermore, the
self-emptying system allows weighing without interruption.
The rain[e]H3 calculates the following values:
► Amount of precipitation
The rain[e]H3 gives the amount of precipitation in real time with a maximum resolution of 0.001 mm.
► Intensity within the last minute
The rain[e]H3 measures 6 times per minute and sums these values up in a moving sum - that is, every
time a new value is measured, it is summed to the previous 5 values and thus generates the new value for
the intensity within the last minute.
► Intensity since last retrieval
The difference in the amount of precipitation since the last retrieval is divided by the time since the last
retrieval. If the time is smaller than 30 s, the rain[e]H3 will use the “intensity within the last minute” value.
► Amount since last retrieval
The difference in the amount of precipitation between the current and the last retrieval.
► Minimum intensity within the last x minutes (RS485 interface)
Every minute the value of the intensity within the last minute is compared to the current minimum value. If
the new value is smaller, it replaces the former minimum value.
► Maximum intensity within the last x minutes (RS485 interface)
Every minute the value of the intensity within the last minute is compared to the current maximum value. If
the new value is bigger, it replaces the former maximum value.
► Variance
Variance of measured values over 4 s
The RS485 interface can be used in Talker or WL ASCII mode.
6 Heating
The rain[e]H3 is best suited to applications in regions with seasonal or permanent cold climate. The internal heating
is separated in into three parts: A 70 W heater which is installed on the inner side of the funnel, melts sublimate,
a 70 W ring heater heats the funnel opening and a 60 W heating foil under the protection grid and the collecting
funnel prevent complete icing of the outlet. Within its operating temperature of -40…+70 °C the target temperature
of the funnel surface of the heated rain[e]H3 is 2 °C. The operational readiness is checked continuously and can
be requested via the RS485 interface. The heating can be switched off via the configuration software rain[e]H3
Commander. In the factory settings the heating is switched on. The heating uses a separate power cable.
Funnel heating and drain heating can be very hot if the heating is operated with the housing open.
There is a risk of being burnt! It is therefore recommended that the connector of the heating
supply be disconnected during cleaning and maintenance work.
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