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The SpaceLogger A10 Analogue is a versatile 2 channel 4 to 20 mA data logger.
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Data is stored on a removable memory card (included), enabling remote data logging without the need for direct connection to a PC. After logging, the memory card can be simply inserted in a card reader, to view and analyse the data on a PC; no special software is required.
Each data record can be date and time-stamped when it is stored. A new file is generated for each day's data. The default file format is .CSV; other file extensions may be specified.
Data is stored as ASCII text with each record on a new line with comma separated fields. The available fields are: record prefix text, time & date, channel 1 reading, channel 1 units text, channel 2 reading, channel 2 units text, switch state.
Analogue values can be linearly scaled to convert to the units of the parameter being measured. Readings are sampled at 75 Hz and averaged over 1 sec.
In addition to the two analogue channels, the status of a switch input and data received on the logger's RS232 input can be recorded. A comprehensive range of conditions for logging may be specified, which can be conditional on the analogue inputs, switch status or RS232 data.
RS232 data can be output and loggers daisy chained to increase the number of channels.
Customised versions and quantity discounts are available - please contact our sales team for a quote.
The SpaceLogger A10 may be set to output a data string with measured values in any required units. The user may specify the units to appear in the logged data record with command UNITS1="degrees", for example.
It is necessary to set up the scaling factors to achieve readings in the required units over the measurement range from the measured current in mA.
A typical string of data for each sample logged by the SpaceLogger A10 would be as follows:
Prefix, Date, Time, Channel 1, Units for Channel 1, Channel 2, Units for Channel 2, Switch State<CR><LF>
Where:
Prefix: | text set by user - may be up to 10 characters long |
Date: | format is DD/MM/YYYY (10 characters) |
Time: | format is hh:mm:ss (8 characters) |
Channel 1: | recorded value could be up to 16 characters max, including decimal point |
Units 1: | text set by user - may be up to 10 characters long |
Channel 2: | recorded value could be up to 16 characters max, including decimal point |
Units 2: | text set by user - may be up to 10 characters long |
Switch Sate: | logged as 0 or 1 (1 character) |
<CR><LF>: | end of line is 2 characters |
Therefore, max number of characters in one sample is 90, i.e. 90 bytes (including the comma delimiters).
If logging a sample once per second, for one month this would be approximately 250 MB of data in total.
The following table gives the approximate capacity of the SD card, depending on the logging interval selected and the actual size of the data sample recorded:
SpaceLogger A10Data capacity by sample size and logging rate |
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Memory Card Size | 90bytes @ 1 per sec |
90bytes @ 1 per 5 sec |
45bytes @ 1 per sec |
45bytes @ 1 per 5 sec |
2 GB | 8 months | >3 years | 16 months | >6 years |
In this example we will use the low cost Devantech SRF06 ultrasonic ranger with 4-20mA output. It has an output current specified as 4mA + 31.37uA/cm
For channel 1 the value output by the logger is given by
Where
A1 is the measured value in mA x 100
OFFSET1 is the offset in mA x 100
SCALE1 is the scaling factor
POWER1 is the exponent for the power of 10 multiplier
So if we wish to record d the distance from the sensor to the water surface in metres OFFSET1 = - 4 x 100 = - 400
The scale value we require is the number of meters per 1/100th of a mA
SCALE1 x 10POWER1 = 0.01/3.137 meters per 1/100th of a mA
= 0.0031878 meters per 1/100th of a mA
The logger uses integer maths and requires a value in the range +/- 32767 for SCALE1 so we can use 31878 with a multiplier of 10-7 to position the decimal point correctly.
SCALE1 x 10POWER1 = 31878 x 10-7
As 1/100th of a mA represents just over 3mm it is adequate to record 2 decimal places so
DP1 = 2
The following commands could therefore be used to setup the logger
SCALE1= 31878
OFFSET1= -400
POWER1= -7
DP1= 2
RATE= 10
MODE= NORMAL
FORMAT= P T C1 U1
TRIGGER= SO
PREFIX="Tank1"
UNITS1="m"
The recorded data would look similar to:
Tank1,15/03/12,12:44:40,0.22,m
Tank1,15/03/12,12:44:50,0.22,m
Tank1,15/03/12,12:45:00,0.22,m
Tank1,15/03/12,12:45:10,0.22,m
If it is required to synchronise readings from a number of loggers in different locations, eliminate any issues with real time clock drift or just know the location of the reading then the ability to connect a GPS to the logger is really useful.
In this example every 10 seconds we will record the RMC sentence from a GPS receiver which provides date, time, position, speed and course over ground information and readings from two 4 – 20mA sensors.
There are a number of GPS receivers that have RS232 outputs that are suitable for connecting to the logger, Garmin produce the GPS 35 HVS or GPS35 PC for example.
The logger needs to operate in slave mode and set to capture the RMC sentence every 10 seconds which is done by specifying a start string that requires the least significant digit of the time (UTC) field must to be 0
STX="$??RMC,?????0"
Question marks represent characters that can have any value.
The carriage return character can be used to identify the end of the RMC sentence and will be replaced by the analogue readings when data is recorded.
The following commands could be used to setup the logger
SCALE1=1
OFFSET1=0
POWER1= -2
DP1=2
UNITS1="mA"
SCALE2=1
OFFSET2=0
POWER2= -2
DP1=2
UNITS2="mA"
FORMAT= P C1 U1 C2 U2
PREFIX="A10"
MODE= SLAVE
STX="$??RMC,?????0"
ETX=13 // decimal value of ASCII carriage return
character
BAUD=4800 //NMEA standard baud rate
OUTPUT= C
Example of the recorded data:
$GPRMC,110150.739,A,5045.2096,N,00131.6903,W,0.00,,020412,,*05,A10,8.89,mA,9.90,mA
$GPRMC,110200.739,A,5045.2087,N,00131.6868,W,0.00,,020412,,*0F,A10,8.89,mA,9.90,mA
$GPRMC,110210.738,A,5045.2084,N,00131.6883,W,0.00,,020412,,*09,A10,8.89,mA,10.20,mA
$GPRMC,110220.738,A,5045.2085,N,00131.6892,W,0.00,,020412,,*0B,A10,8.89,mA,10.20,mA
$GPRMC,110230.737,A,5045.2088,N,00131.6886,W,0.00,,020412,,*0D,A10,8.89,mA,10.20,mA
$GPRMC,110240.736,A,5045.2102,N,00131.6912,W,0.00,,020412,,*04,A10,8.89,mA,10.20,mA
The logger can operate without a memory card just to provide an analogue to RS232 converter function.
To do this the output should be set to continuous.
For example the following commands in the SETUP.TXT file would give the output shown above
SCALE1=1
OFFSET1=0
POWER1= -2
DP1=2
RATE=1
MODE= NORMAL
FORMAT= P T C1 U1
OUTPUT= C
PREFIX="#A10"
UNITS1="mA"
The SpaceLogger can be setup to record a single reading each time a switch is closed.
The switch could be a simple push button or for example some kind of position/object detection switch.
If required there can also be a programmable delay after the switch is closed to allow the sensor to stabilise before recording the reading.
The SpaceLogger MODE must be SINGLE so repeated readings are not recorded if the button is held closed.
The RATE setting has no effect when in single mode. The logger takes a reading every second but only records the single required reading. It will not record readings at more than once a second.
As an example the following commands in the SETUP.TXT file would record a reading 5 seconds after the push button is pressed.
SCALE1=1
OFFSET1=0
POWER1= -2
DP1=2
RATE=1
MODE= SINGLE
FORMAT= P T C1 U1
TRIGGER= SC
DELAY=5
PREFIX="#A10"
UNITS1="mA"
If an indication that a reading has been taken is required a high efficiency led (Avago HLMP-K155 RS 826-521 Farnell 100-3210) can be connected to the alarm output and the alarm condition set to logging by including the following command in the SETUP.TXT file.
ALARM=L
The LED will come on shortly after the switch is pressed and remain on during the delay until the reading is recorded.
Often it is useful to record the supply voltage this can be done with a simple resistor between the supply and one of the analogue inputs.
The choice of resistor value will depend on the accuracy required, acceptable current draw and supply voltage range.
The current through the resistors is
I = V/( R + 47 + 130 )
To record the reading in volts we require the volts per 0.01 mA
SCALE1 x 10POWER1 = 0.00001 x ( R + 177 )
For R = 4700 ohms this would give
SCALE1 x 10POWER1 = 0.04877
So we can use
SCALE1 = 4877
POWER1 = -5
The maximum voltage V is limited by the maximum allowable voltage across the 130 ohm resistor of 3 volts. Note V must always be positive.
SCALE1= 4877
OFFSET1= 0
POWER1= -5
DP1= 1
RATE= 10
MODE= NORMAL
FORMAT= P T C1 U1
TRIGGER= SO
PREFIX="V1"
UNITS1="volts"
V1,15/03/12,12:44:40,13.4,volts
V1,15/03/12,12:44:50,13.4,volts
V1,15/03/12,12:45:00,13.5,volts
V1,15/03/12,12:45:10,13.5,volts
If two 4 to 20mA channels is not enough, the number of channels can be extended by daisy chaining SpaceLogger A10s together.
The first logger in the chain determines the frequency and/or conditions for measurements, the rest of the units operate in slave mode appending their data to the received data. The last unit in the chain stores the data on to the SD card.
SCALE1=1
OFFSET1=0
POWER1= -2
DP1=2
UNITS1="mA"
SCALE2=1
OFFSET2=0
POWER2= -2
DP2=2
UNITS2="mA"
RATE=10
MODE= NORMAL
FORMAT= P T C1 U1 C2 U2
OUTPUT= C
TRIGGER= SO
PREFIX="Ch1-8" //will be used to identify the start of the reading by
subsequent loggers
SCALE1=1
OFFSET1=0
POWER1= -2
DP1=2
UNITS1="mA"
SCALE2=1
OFFSET2=0
POWER2= -2
DP2=2
UNITS2="mA"
MODE= SLAVE
FORMAT= C1 U1 C2 U2
OUTPUT= C
STX="Ch1-8" // start of string output by logger 1
ETX=13 // decimal value of ASCII carriage
return character
Ch1-8,15/03/12,12:44:40,8.89,mA,9.90,mA,5.85,mA,9.10,mA,15.19,mA,7.90,mA,8.82,mA,13.64,mA
Ch1-8,15/03/12,12:44:50,8.89,mA,9.90,mA,5.85,mA,9.10,mA,15.19,mA,7.90,mA,8.82,mA,13.64,mA
Ch1-8,15/03/12,12:45:00,8.89,mA,9.90,mA,5.85,mA,9.10,mA,15.19,mA,7.90,mA,8.82,mA,13.64,mA
Ch1-8,15/03/12,12:45:10,8.89,mA,9.90,mA,5.85,mA,9.10,mA,15.19,mA,7.90,mA,8.82,mA,13.64,mA
Physical | Enclosure dimensions | Width: 67 mm Depth: 67 mm Height: 28 mm (excluding optional rubber feet) |
Weight | 75g | |
Enclosure material | GP ABS (UL94-HB) plastic and acrylic | |
Connections | Type | Screwless terminals capable of accepting wire 0.32 to 0.65mm diameter (AWG 28 to 22) |
Analogue Input | Number of Channels | 2 |
Range | 4 to 20 mA (0 to 23 mA maximum) | |
Sampling | Readings are sampled at 75 Hz and averaged over 1 sec | |
Maximum logging rate | 1 Hz | |
Input impedance | 177 ohms | |
Accuracy | ±1% or 0.1 mA at 20 °C over range 4 to 20 mA | |
Drift with temperature | 100 ppm / °C over range -40 °C to +40 °C | |
Analogue to digital converter | 10-bit resolution | |
Switch Input | Digital channel | Input for logging control switch |
Max input voltage | Must not exceed 3V | |
Current out | 7μA max | |
RS232 Input | Number of channels | 1 |
Transmission standard | RS232 compatible, 8 bits and no parity | |
Transmission speed | 9600 Baud (default) or selectable from 115200, 57600, 38400, 19200, 4800, 2400, 1200, 300 or 110 Baud | |
Data sample | Records only the data between specified start (STX) and end (ETX) characters | |
RS232 Output | Transmission standard | RS232 compatible, 8 bits and no parity |
Transmission speed | 9600 Baud (default) or selectable from 115200, 57600, 38400, 19200, 4800, 2400, 1200, 300 or 110 Baud | |
Output rate |
Normal Mode: 1 data record per 1 to 60 seconds - selectable Single sample Mode: single data record output in response to event defined by command TRIGGER Slave Mode: rate determined by input of RS232 data sample defined by STX and ETX |
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Alarm Output | Min output voltage | VOH=1.7V Typ @ 1mA output current |
Data Storage | Data storage card | Removable SD, MMC or MMC mobile card |
Data capacity | 2 GByte (max) | |
File system |
FAT16 or FAT32 with 8.3 file names Sector size 512 Bytes |
|
Data logging interval |
Normal Mode: 1 data record per 1 to 60 seconds - selectable Single sample Mode: single data record logged in response to event defined by command TRIGGER with time delay defined by command DELAY Slave Mode: rate determined by input of RS232 data sample defined by STX and ETX |
|
Audible / Visual Indicators |
LED indicators |
Green: Ready to record data Red: Power on, Writing data to SD card |
Audio bleeper |
Two tone signal on correct card insertion Single tone when data purge button depressed Four bleeps per minute when time and date not set |
|
Real Time Clock | Accuracy | ±40 ppm at 25°C |
Backup battery | CR2032 | |
Power | Power requirement | 7 to 30 V DC |
Current at 12 VDC | 10 mA typical | |
Supply input protection | Polarity reversal protected and internal resettable 140 mA fuse | |
Connection options (both included) | 1.3 mm centre pin DC connector, or Screwless terminals (0.32 to 0.64 mm diameter, AWG 28 to 22 conductors) | |
Environmental | Temperature range |
Operating: -25°C to +70°C [or dependent on card conditions] Storage: -40°C to +70°C |
Enclosure protection | IP203 | |
EMC |
EMC Directive 89/336/EEC - CE marked (Emissions: EN61326:1997 inc A1/A2/A3:2003, EN60945:1997 Immunity: EN61326:1997) FCC/CFR 47: Part 15:2004 |
The manufacturer reserves the right to amend the specification and therefore the information in this document may be subject to change.
User Manual & Data Sheet | |
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SpaceLogger A10 - User Manual |
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SpaceLogger A10 - Data Sheet |
Mapping Conditions & Life on the Sea Bed | |
The SpaceLogger S10 data loggers were part of the equipment on three 3000 metre depth rated 'pods' along with batteries, video processing equipment and control electronics. Marcus Shirley of Mr ROV, a member of the research team, confirmed back to us: "The loggers worked great and allowed us to reliably record accurate data which we were able to easily import into our scienfic modelling software. The time stamping feature allowed us to sync up all the data with the logged data from the ship's GPS and vehicle USBL position transponder, creating a very comprehensive data set. Many thanks for your help. The SpaceLogger S10 data loggers were great and 100% reliable, which is very important when you're on a ship far from land!" |
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New Zealand Lamb Weighing System | |
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Straits of Malacca & Singapore Shipping Data | |
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Vehicle Activated Signs Data | |
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Bombardier Transportation Rail Vehicle Data | |
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Load Cells with 4-20mA Output | |
The SpaceLogger A10 may take up to two 4-20mA analogue output. Readings are sampled at 75Hz, averaged over 1 second and time and date stamped when stored. The SpaceLogger A10 can be daisy chained for multiple load cell monitoring. Data is captured in a daily .csv file for easy analysis within a spreadsheet. If required conditional logging can be utilised. |
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Outside Webcasting Services | |
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Manufacturing Quality Control For Water Softener Filters | |
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Gwennap Head National Coastwatch Weather Station | |
Richard Paul Russell has provided a complete internet connected weather station utilising a SpaceLogger W50 for the National Coastwatch Institution at Gwennap Head in Cornwall. The Gill Metpak weather sensor data is captured by the W50 data logger enclosed in the WeatherFile Connection Unit (WCU) and then transferred via the W50's Wi-Fi module to the Local area network and the internet. The live and historic wind speed, wind direction, pressure, temperature and humidity data can then be viewed on any internet connected device via the WeatherFile website. Richard Paul Russell have over 70 weather systems all using SpaceLogger W50s viewable on the WeatherFile website. |
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Ryde Pier, Isle of Wight, Wind Data | |
This takes the Solent WeatherFile network to five sites and is an essential resource for sailors, water sport enthusiasts, sailing event organisers and others wishing to have live and accurate wind speed and direction measurements. One of the main challenges faced when fitting this unit was to overcome the lack of a local power supply and Wi-Fi internet access. Our newly developed WeatherFile Mobile Unit (WMU) containing a W50 and associated 4G router allows data to be gathered directly from the Gill MaxiMet GMX200 sensor and sent to our WeatherFile website. This was locally powered through a deep cycle leisure battery (70Ahr) connected to a solar panel. The result is cable free live data through WeatherFile completely independent of mains power and local internet. |
Industrial Emissions Monitoring Data | |
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Milk Pasteurizer Machine Data Back-up | |
Why this logger is so critical is that the normal method of recording the data requires a degree of manual interaction, and if this does not occur for some reason, the entire batch cannot be sold due to the lack of pasteurization data. |
Warehouse Loading Bay Wind Data | |
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Industrial Emissions Monitoring Data | |
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Gwennap Head National Coastwatch Weather Station | |
Richard Paul Russell has provided a complete internet connected weather station utilising a SpaceLogger W50 for the National Coastwatch Institution at Gwennap Head in Cornwall. The Gill Metpak weather sensor data is captured by the W50 data logger enclosed in the Weatherfile Connection Unit (WCU) and then transferred via the W50's Wi-Fi module to the Local area network and the internet. The live and historic wind speed, wind direction, pressure, temperature and humidity data can then be viewed on any internet connected device via the WeatherFile website. Richard Paul Russell have over 50 weather systems all using SpaceLogger W50s viewable on the WeatherFile website. |
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Ryde Pier, Isle of Wight, Wind Data | |
This takes the Solent WeatherFile network to five sites and is an essential resource for sailors, water sport enthusiasts, sailing event organisers and others wishing to have live and accurate wind speed and direction measurements. One of the main challenges faced when fitting this unit was to overcome the lack of a local power supply and Wi-Fi internet access. Our newly developed WeatherFile Mobile Unit (WMU) containing a W50 and associated 4G router allows data to be gathered directly from the Gill MaxiMet GMX200 sensor and sent to our WeatherFile website. This was locally powered through a deep cycle leisure battery (70Ahr) connected to a solar panel. The result is cable free live data through WeatherFile completely independent of mains power and local internet. |
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Scottish Airport Cloud Ceilometer Data | |
This development has allowed Richard Paul Russell to enter the small airfield market with equipment system supply for comprehensive live wind, weather and visibility data. |
Eschmann Technologies Dental Autoclave Real-Time Cycle Data Management | |
The hardware customisation was in the areas of enclosure, brand labelling and over-moulded cable assembly. The software development was extensive to interpret the cycle data, allow manual input of additional tests and checks, facilitate user data analysis and present the combined data in the desired summary and detailed formats including Eschmann branded pdfs. This was a relatively complex project that has provided Eschmann customers with an on-going very successful product, that is still standing the test of time some 10 years after first use. |
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Prestige Medical's Dental Decontamination Autoclave Cycle Logging | |
The most recent customisation was for a re-designed PCB-only logger to be built-in to a new autoclave design, with particular requirements for the SD card interface with the autoclave control panel fascia. This involved a new PCB layout to accommodate several changes including a new push-push SD card connector. |
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MDS Medical's Dental & Veterinary Autoclave Data Management System | |
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Large Scale Plasma Sterilizer Data | |
The data logger is shipped to Renosem's manufacturing facility as PCB-only for internal fitting in their plasma sterilizers. The SD card, LED indicators and purge button are all accessible through a faceplate in the outer casing of the sterilizer. The data is saved in daily text files, replicating the format that would be seen on a traditional paper printer-out. |
Eschmann Technologies Dental Autoclave Real-Time Cycle Data Management | |
The hardware customisation was in the areas of enclosure, brand labelling and over-moulded cable assembly. The software development was extensive to interpret the cycle data, allow manual input of additional tests and checks, facilitate user data analysis and present the combined data in the desired summary and detailed formats including Eschmann branded pdfs. This was a relatively complex project that has provided Eschmann customers with an on-going very successful product, that is still standing the test of time some 10 years after first use. |
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Warehouse Loading Bay Wind Data | |
The W100 with a wired LAN connection is particularly valuable for safety critical applications such as this, and also where Wi-Fi is unreliable. |
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On-board Vehicle Bin Weighing Systems | |
Further developments in this area have included Wi-Fi connectivity to allow direct data transfer as soon as soon as refuse or grit/salt spreader vehicles return to base. |
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Mettler Toledo Laboratory Weigh Scales | |
The SpaceLogger T10 model is ideal for balances with a print command and RS232 output and will keep a text record identical to the paper print-out. Hence the requirement for a dedicated printer on the lab bench is removed. |
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Prestige Medical's Dental Decontamination Autoclave Cycle Logging | |
The most recent customisation was for a re-designed PCB-only logger to be built-in to a new autoclave design, with particular requirements for the SD card interface with the autoclave control panel fascia. This involved a new PCB layout to accommodate several changes including a new push-push SD card connector. |
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Scottish Airport Cloud Ceilometer Data | |
This development has allowed Richard Paul Russell to enter the small airfield market with equipment system supply for comprehensive live wind, weather and visibility data. |
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MDS Medical's Dental & Veterinary Autoclave Data Management System | |
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Large Scale Plasma Sterilizer Data | |
The data logger is shipped to Renosem's manufacturing facility as PCB-only for internal fitting in their plasma sterilizers. The SD card, LED indicators and purge button are all accessible through a faceplate in the outer casing of the sterilizer. The data is saved in daily text files, replicating the format that would be seen on a traditional paper printer-out. |