UM-155-290-Limpet User Manual
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V2.0
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P a g e
2.
Introduction
The EML Limpet logger provides an efficient and economical method of logging rainfall at a remote
location without external power. The Limpet fits inside all EML rain gauges and works for all tipping
bucket rain gauges with simple contact closure/pulse output. It records
rainfall in ‘event’
mode, and
provides the option to post-process the data to different timed intervals, from 1min to 24 hours. For
initial configuration or data collection, the logger is connected to the USB port of a computer. Using
the ‘EML Rain Logger
GUI’ software the user can collects data and configures the logger.
The EML Limpet Logger GUI has been designed to offer full control of the Limpet. Using the
software, you can configure your logger, download, convert and save the data in Text or CSV file
formats.
The Limpet logger contains a microcontroller, a real-time clock, 2Mbytes of non-volatile memory, a
contact input and a USB port for communication with a computer. The Limpet is powered using a
2/3 A 3.6V lithium battery. Measurements from a tipping bucket rain gauge are logged.
3.
Technical specification
Operating Range
-40° to 60°C (-40° to 140°F)
Logging Interval
Event based logging triggered by a contact closure switch,
with timed data conversion after downloading: 1min
–
24 hr
Data sample
Day-Month-Year,Hour:Min:Sec,CF,Count
Memory Mode
Two memory modes:
-
Stop when full,
-
Loop memory
No. of Channels
1
Time Accuracy
±8 seconds per month in 0° to 40°C (32°F to 104°F) range;
±30 seconds per month in -40° to 60°C (-40° to 140°F) range
Battery Type / Power Source
2/3 A 3.6V Lithium Battery
Battery Service Life
6-12 months
Memory details
256 Kb of Non-volatile EEPROM memory. (retains recorded
data even after loss of power). Max: 8513 readings. E.g. The
logger stores 8513 events at 1 count per event.
Size
Limpet
–
75mm(w) x 50mm(d) x 80mm(h)
Limpet-XL - 120mm(w) x 55mm(d) x 95mm(h)
Weight
110g (Limpet) and 220g (Limpet-XL)
Environmental Rating
IP65