EML Limpet Bedienungsanleitung

UM-155-290-Limpet User Manual –V2.0

Limpet

User Manual

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PUBLISHED BY

Environmental Measurements Limited (EML)

7 Jupiter Court

Orion Business Park

North Shields NE29 7SE

United Kingdom

Visit our internet pages at http://www.emltd.net

©EML 2017

No part of this manual may be reproduced without any form or by any means, electronic or

mechanical (including photocopying), nor may its contents be communicated to a third party

without prior written permission of the copyright holder.

The contents are subject to change without prior notice.

Please observe that this manual does not create any legally binding obligation for EML

towards the customer or end user. All legally binding commitments and agreements are

included exclusively in the applicable supply contract or Conditions of Sale.

 
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Table of Contents 
1. General Information.......................................................................................................................4 
About this Manual ..............................................................................................................................4 
Version Information........................................................................................................................4 
2. Introduction....................................................................................................................................5 
3. Technical specification ...................................................................................................................5 
4. Installing the software ...................................................................................................................6 
5. Configuring the logger....................................................................................................................6 
Connect logger to a PC........................................................................................................................6 
Run the ‘Configuration wizard’...........................................................................................................6 
Manually configure the logger............................................................................................................6 
Clear logger memory: .....................................................................................................................6 
Set date-time: .................................................................................................................................6 
Select measurement unit:...............................................................................................................7 
Select calibration factor:.................................................................................................................7 
Select memory mode:.....................................................................................................................7 
6. Event-based memory......................................................................................................................7 
7. Deploying the logger.......................................................................................................................7 
8. Data collection ................................................................................................................................8 
Downloading the data.........................................................................................................................8 
Saving the event data .........................................................................................................................8 
9. Data Conversion..............................................................................................................................9 
10. Troubleshooting........................................................................................................................11 
Appendix A - Frequently ask questions...............................................................................................12 
Installer to run EML Limpet Logger GUI Application ........................................................................12 
FTDI driver auto installation..............................................................................................................13 
 
 
 

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1. General Information

About this Manual

This manual is intended as a general guide for installing, wiring and using a Limpet and LimpetXL data

loggers (from here on, both referred to as Limpet). The information contained in this manual may not

cover all aspects of Limpet applications. Please refer to associated equipment manuals or consult

papers and technical notes on the EML website (www.emltd.net).

Version Information

Table 1 - Document Revisions

EML Document Number:

Description:

UM-155-290-Limpet User Manual

Version 1.0 –21st September 2017

Version 1.1 –13th March 2019

UM-155-290-Limpet User Manual

Version 2.0 –31st May 2019

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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

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

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4. Installing the software

•Insert the EML USB stick received with the EML Limpet Logger (or download from the EML

website –www.emltd.net).

•Run the ‘.exe’ file contained on the device or the download.

•Follow the instructions to install the software.

•After installation, run the ‘EML Limpet Logger GUI.exe’ to open the software.

5. Configuring the logger

Connect logger to a PC

•Connect one end of the serial cable to the Limpet Logger and the other end to a free serial

USB port on the Computer.

•Select ‘Auto detect’ on the Port combo box then Press the ‘Connect’ button. This will

automatically select the appropriate COM port and connect the logger GUI to it.

Run the ‘Configuration wizard’

Press the ‘Config Wizard’ button. This guides the user through the main requirements for configuring

the logger. These are summarised below:

•Clear logger memory

•Set date-time

•Select measurement unit

•Select calibration factor

•Select memory mode

Manually configure the logger

This section describes in more detail the steps carried out in the Configuration Wizard. For manual

configuration of the logger, it is recommended that the user carries out the following tasks in order:

Clear logger memory:

Press ‘Clear memory’ button on the main screen of the software and, if you are sure, press ‘Yes’ when

prompted.

This ensures that the new logger configuration makes use of the whole logger memory. Note that the

memory must be cleared before a new configuration is loaded. Therefore, if there are data on the

logger which are needed, exit the configuration wizard at this point, download the data, and then

return to the configuration wizard.

Set date-time:

Automatically set the date-time: Press ‘Auto set date-time’ button on the main screen of the

software. This will set the logger’s time to the PC time.

Manually set the date-time: Go to ‘Options’ then ‘Set Date and Time Manually’. Use the drop-down

menus to set the logger’s time manually.

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Select measurement unit:

Go to ‘Options’ then ‘Select Measurement Unit’. Select either millimetres or inches.

Select calibration factor:

Go to ‘Options’ then ‘Select Calibration Factor’. This is the precipitation multiplier and is known as

the ‘resolution’. It can be set to any value, but it must be matched up with the appropriate rain gauge.

The resolutions EML tipping bucket rain gauges are shown in the table below:

Rain Gauge Model

Calibration Factor

Kalyx

0.2

SBS-314/0.2

0.2

SBS-314/0.5

0.5

SBS-500/0.2

0.2

SBS-1000

0.1

UPG-1000

0.1

Select memory mode:

Go to ‘Options’ then ‘Select Memory Mode’. There are two options for configuring the logger’s

memory mode. These are described as follows:

Loop memory (overwrite oldest data): This option means that the logger will continue indefinitely.

However, whenever the memory capacity is full, the oldest data will begin to be overwritten. A unique

feature of this logger is that if this happens, a record of the total rainfall including the ‘old data’ is kept,

even after the memory has been erased.

Stop when full: This option stops the logger from recording any more data when the memory

becomes full.

6. Event-based memory

The time of the contact closure (e.g. one tip of a tipping bucket rain gauge) is recorded to the nearest

second. The logger ‘wakes up’ to record each rain gauge tip before returning to a sleep state. This

mode is ideal for precipitation intensity measurements, and is also the lowest power mode.

7. Deploying the logger

The logger has now been configured. Now it must be connected to the rain gauge and made ready

for field deployment.

Disconnect the serial cable from the logger and replace the blue cap on the end of the connection

point. Any tips of the gauge that occur after this point will be recorded.

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Attach the two wires to the connection points on the rain gauge and fit the logger into place. On the

Kalyx this process involves pushing the base of the logger onto the raised bar of the gauge until the

logger clicks into place and a firm attachment is achieved.

The logger is now fully set up and the gauge is ready for field deployment. For details of how to carry

out this task refer to the individual rain gauge manual.

8. Data collection

Data can be downloaded from the logger and saved as .txt or .csv file. The data format is simple and

easily accessible. The data is separated by a comma by default. When saved as a .csv it will therefore

look like the following:

Date

Time

Calibration Factor

Count

07-10-2016

12:03:56

0.200

001

07-10-2016

12:05:02

0.200

001

07-10-2016

12:07:06

0.200

001

Downloading the data

Connect the datalogger to the PC using the method outlined in Section 4.1.

Press ‘Download Data’ button on the main screen of the software.

The data will appear in the output box in the centre of the main software screen

Saving the event data

When downloading is complete, the data should be visible in the output screen on the main page of

the software. These data can now be saved as one of two file types.

On the main toolbar, press ‘File’. There will be two options, ‘Save As txt’ or ‘Save As csv’.

Select the preferable file type.

A Windows Explorer box will appear, requesting the user to navigate to the location in which they

wish to save the file.

Select a suitable location and choose an appropriate file name and click ‘Save’.

See Figure 1 for a screen grab of the software when saving the event data.

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Figure 1: Saving the event data

9. Data Conversion

The event data can be converted to any aggregation interval between 1 minute and 24 hours. This

means that all the events recorded within a specified interval are aggregated and recorded as a total

number of events within the specified time period.

Select the “Data Conversion” tab on the software screen.

Select the data file you wish to perform the conversion for. The file name data file is as follows:

{Logger name}_{Date downloaded}_{Time downloaded}_Event

The screen grab in Figure 2 shows the file being selected for data conversion.

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Figure 2: Select the event data file to perform the data conversion on

The next step is to select the interval to which the event data should be aggregated. This can be

anywhere between 1 minute and 24 hours.

After this has been done, it is necessary to select the timing interval to which the user would like to

round to. For example, in Figure 3 below a time interval of 5 minutes has been selected and the

“Round up by” tool is set to 3 minutes. This is calculated by looking at the time of the first data point

(highlighted in blue below) and rounding up to the time interval at which the user would like to start

the aggregations.

For example, the first event in the figure below is recorded at 09:47:28. To aggregate the data to a 5

minute interval, starting at 09:50:00 would be a typical approach. Rounding 09:47:28 up to 09:50:00

requires a “Round up by” value of 3 minutes to be entered.

Once the “Convert” button has been pressed, the newly aggregated data appears in the window at

the bottom of the screen entitled “Converted File”.

Don’t worry, if you get this interval wrong initially, it is simple and quick to amend the “Round up by”

value and reconvert the data correctly.

Then, the data can be saved in the usual way (as described in Section 8 of this manual), as shown on

the right-hand side of Figure 3 below.

It is good practice to save the data with the interval at the end of the file, instead of “Event”. E.g.

{Logger name}_{Date downloaded}_{Time downloaded}_5mins

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