OTT ecoLog 500, Руководство по эксплуатации

Страница: 8 / 56

4 Introduction
The OTT ecoLog 500 (3G) groundwater datalogger is designed to precisely mea-
sure and store groundwater levels and temperature and to transmit these mea-
sured values through a GSM cellular network.
The pressure probe equipped with a relative pressure probe cell uses the hydro-
static pressure of the water column to determine the water level. As a reference, a
pressure compensation capillary in the pressure probe cable provides the measur-
ing cell with the current ambient air pressure. Erroneous measurement results due
to atmospheric air pressure fluctuations are thus eliminated.
The OTT ecoLog 500 (3G) is available in five measuring ranges:
0 … 4 m water column (0 ... 0.4 bar)
0 … 10 m water column (0 ... 1 bar)
0 … 20 m water column (0 ... 2 bar)
0 … 40 m water column (0 ... 4 bar)
0 … 100 m water column (0 ... 10 bar)
Based on a reference value that is input during startup, the OTT ecoLog 500 (3G)
default setting provides measurement results in the form of depth values. Alterna-
tively, levels or pressure values are possible. The measurement intervals (sample
intervals) can be preselected as necessary.
The operating parameters are set using the "OTT Water Logger Operating Pro-
gram" PC software. This software allows the system to be conveniently and flexibly
tailored to a wide range of measurement requirements of a station. The software
can be set to provide a basic or an advanced user interface. The basic user inter-
face allows all settings to be adjusted within a single program window. In the
advanced user interface, the sample interval can be controlled e.g. by means of
limit events. The software also supports the execution of pumping tests.
The stored measured values are made available through an infrared interface
(IrDA) for wireless readout using PC on which the OTT Water Logger Operating
Program is executed.
The OTT ecoLog 500 (3G) includes a built-in cellular modem (with SMA antenna
connector) that is used for remote data transfer and remote parameterizing
1)
via
the cellular network. The remote data transfer can be optionally carried out by
SMS text messages or transmission services GSM, GPRS, UMTS
2)
or HSPA+
2)
.
If necessary – e.g. when the signal strength of the cellular network is low at the
installation site – the factory installed radio antenna may be replaced by an exter-
nal one.
The OTT ecoLog 500 (3G) is installed by simply hanging it into observation wells
of 2" in diameter and above. For this purpose, various adapters/universal suspen-
sion brackets are available as accessories. For power supply, three options are
available: lithium battery, DD type, 26 Ah capacity; lithium battery, D type, 13 Ah
capacity; or commercial alkaline batteries (only OTT ecoLog 500 with dedicated
battery holder). When using the DD type lithium battery, battery lifetime is
(depending on additional parameters) at least 10 years, taking into account one
single remote data transfer per day.
The communication unit of the OTT ecoLog 500 (3G) can withstand temporary
flooding (for details, refer to Chapter 23, "Technical data").
1)
only OTT ecoLog 500
2)
only OTT ecoLog 500 3G
8