Campbell Hausfeld Marine Instruments CS115 User Manual

CS115  
Barometric Pressure Sensor  
3/03  
C o p y r i g h t ( c ) 2 0 0 2 - 2 0 0 3  
C a m p b e l l S c i e n t i f i c , I n c .  
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CS115 Table of Contents  
PDF viewers note: These page numbers refer to the printed version of this document. Use  
the Adobe Acrobat® bookmarks tab for links to specific sections.  
1. Introduction.................................................................1  
2. Specifications .............................................................2  
2.1 Performance..............................................................................................2  
2.2 Electrical...................................................................................................2  
2.3 Physical.....................................................................................................2  
3. Installation...................................................................3  
3.1 Venting and Condensation........................................................................3  
3.2 Mounting...................................................................................................3  
3.3 Jumper Settings.........................................................................................4  
4. Wiring ..........................................................................5  
5. Programming ..............................................................5  
5.1 Period Averaging Measurement Examples ...............................................7  
5.1.1 Period Averaging Measurement Example for CR10(X)..................7  
5.1.2 Period Averaging Measurement Example for CR10(X) in a Slow  
Executing Program ....................................................................8  
5.1.3 Period Averaging Measurement Example for CR23X ....................9  
5.1.4 Period Averaging Measurement Example for CR5000 in a Fast  
Executing Program at 10 Hz....................................................11  
5.2 Pulse Count Measurement Example........................................................12  
5.21 Pulse Count Measurement Example for 21X .................................12  
5.3 Output Resolution...................................................................................13  
6. Correcting Pressure to Sea Level............................13  
7. Maintenance and Calibration ...................................14  
Figures  
3-1 Mounting CS115.......................................................................................3  
3-2 Jumper Settings on CS115........................................................................4  
Tables  
4-1 Wiring for Example Programs..................................................................5  
5-1 Conversion Factors for Alternative Pressure Units...................................6  
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CS115 Barometric Pressure Sensor  
The CS115 Barometric Pressure Sensor uses the resonant silicon technology pressure  
sensor developed by Druck. The sensor outputs a variable frequency which can be  
measured using the datalogger's period averaging instruction or pulse count instruction.  
The entire process is essentially digital from sensor element to datalogger, ensuring the  
highest precision and most accurate reading possible.  
1. Introduction  
The sensor comprises two elements, one acting as a pressure sensitive  
diaphragm and the other acting as a resonator. Pressure variations deflect the  
sensitive diaphragm and change the sensor’s resonant frequency. The resonant  
frequency is measured, corrected for the effects of temperature and non-  
linearity, and then output as a frequency signal. The sensor is characterized  
over the full temperature and pressure range, and the corrections are stored in  
the sensor's non-volatile memory. It can be operated in a triggered or  
continuous mode. In the triggered mode the datalogger switches 12 VDC  
power to the barometer before the measurement. The datalogger then powers  
down the barometer after the measurements to conserve power.  
1
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CS115 Barometric Pressure Sensor  
2. Specifications  
2.1 Performance  
Measurement Range:  
600 mb to 1100 mb (hPa)  
Operating Temperature Range: -40°C to +60°C  
Humidity Range:  
Media Compatibility:  
Total Accuracy1:  
at 20°C  
non-condensing  
non-corrosive gas  
±0.3 mb  
-10°C to +50°C  
-20°C to +60°C  
-40°C to +60°C  
Long-term Stability:  
Overpressure Limit:  
±0.5 mb  
±1.5 mb  
±2.0 mb  
<0.11 mb per year (100 ppm)  
1375 mb  
2.2 Electrical  
Supply Voltage:  
9.5 V to 24 VDC  
Current Consumption:  
Output Frequency:  
Frequency Output:  
External Trigger Voltages:  
8 mA nominal  
600 Hz to 1100 Hz  
-2.5 to +2.5 VDC zero-crossing square wave  
ON 1 to 24 VDC  
OFF 0 VDC  
Warm-up Time:  
EMC Compatibility:  
<2 seconds (-40°C to +60°C)  
Emissions – BS EN50081-1  
Immunity – BS EN61000-6-2  
2.3 Physical  
Dimensions (Main Box):  
2.36” x 2.36” x 1.15”  
(6.0 cm x 6.0 cm x 2.9 cm)  
4.4 oz (125 g)  
Weight:  
Mounting Hole Centers:  
Pressure Connector:  
3 inches (7.62 cm)  
0.16” (0.4 cm) barbed hose  
The black outer jacket of the cable is Santoprene® rubber. This  
compound was chosen for its resistance to temperature extremes,  
moisture, and UV degradation. However, this jacket will support  
combustion in air. It is rated as slow burning when tested  
according to U.L. 94 H.B. and will pass FMVSS302. Local fire  
codes may preclude its use inside buildings.  
NOTE  
1 Non-linearity, hysteresis, and repeatability over calibrated temperature range  
2
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CS115 Barometric Pressure Sensor  
3. Installation  
3.1 Venting and Condensation  
To prevent condensation, install the sensor in an environmentally protected  
enclosure, complete with desiccant which should be changed at regular  
intervals. As the sensor must detect the external ambient pressure the enclosure  
must not be ‘hermetically sealed’.  
Failure to protect the sensor from condensation may result  
in permanent damage.  
CAUTION  
NOTE  
If it is necessary to make a vent hole on the outer wall of an  
enclosure, do not make the hole on one of the vertical side walls,  
as wind blowing around it can cause transient changes in  
pressure.  
3.2 Mounting  
The mounting holes for the sensor are one-inch-centered, and will mount  
directly onto the holes on the backplates of the Campbell Scientific enclosures.  
Mount the sensor with the pneumatic connector pointing vertically downwards  
to prevent condensation collecting in the pressure cavity, and also to ensure  
that water cannot enter the sensor.  
FIGURE 3-1. Mounting CS115  
3
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CS115 Barometric Pressure Sensor  
As you mount the sensor onto the backplate of the enclosure, place the fork lug  
under the mounting screw to accomplish the proper grounding of the sensor as  
shown in Figure 3-1.  
3.3 Jumper Settings  
The CS115 has two operating modes, ‘continuous’ and ‘triggered’. It is normally  
shipped in the ‘triggered’ mode, in which the unit is turned on and off by applying  
signal to the blue wire (EXT. TRIG.) using a datalogger’s control port. In this  
mode, power consumption is minimized, but the sensor is subject to a 2-second  
‘warm-up’ delay after it is turned on. You can also configure the unit for the  
‘continuous’ mode to avoid the need for the delay, in which the sensor is powered  
on continuously. This can be achieved either by connecting the blue wire (EXT.  
TRIG.) to a continuous 1 to 24 VDC supply (to 5 V or 12 V channel of the  
datalogger) or by changing the jumper position connecting the pins on the circuit  
board. See Figure 3-2 below.  
Jumper (blue link) –  
Position A = continuous mode  
Position B = triggered mode  
A
B
FIGURE 3-2. Jumper Settings on CS115  
4
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CS115 Barometric Pressure Sensor  
4. Wiring  
The CS115 wiring instructions for the example programs are shown in  
Table 4-1. For dataloggers CR500, CR510, CR10(X), CR23X, and CR5000,  
analog channel is used for period averaging measurement. For CR7, 21X and  
CR9000 pulse channel is used for pulse count measurement.  
TABLE 4-1. Wiring for Example Programs  
Wire Color  
Green  
Red  
Description  
CR10(X)  
SE6  
12V  
G
CR23X  
SE24  
12V  
21X  
P1  
CR5000  
SE33  
12V  
Frequency Out  
Supply (12Vdc)  
Power Ground  
Signal Ground  
External Trigger  
Shield  
12V  
Black  
G
G
Yellow  
Blue  
AG  
C8  
C1  
G
C6  
C1  
G
Clear  
G
5. Programming  
There are two ways to measure the output of the CS115. The preferred way is  
to use the period averaging instruction available with the CR500, CR510,  
CR10(X), CR23X and CR5000 dataloggers. This instruction determines the  
period of the output signal averaged over a user-specified number of cycles and  
outputs it in kHz.  
If you have a datalogger that does not support the period averaging instruction  
(e.g., 21X, CR7 or CR9000), a pulse count instruction can be used to measure  
the CS115.  
Atmospheric pressure changes little with time. In most weather station  
applications measuring pressure once an hour is adequate.  
In Example 1, the datalogger turns on the CS115 one minute before the top of  
the hour with a control port. As in the example, the execution interval must be  
one minute or less. The datalogger measures the CS115 on the hour, and then it  
turns the CS115 off.  
In Example 2, the CS115 is measured every execution interval. The datalogger  
turns the CS115 on and waits two seconds for it to warm up before the  
measurement is made. The execution interval must be long enough to  
accommodate the two-second warm-up delay plus all the other measurements  
and processing instructions in the program.  
Example 3 resembles Example 1 in every way, but it is for the CR23X.  
In Example 4, the CR5000 measures the CS115 once an hour in a program that  
runs at 10 Hz. With the CR5000, the period averaging instruction has to be  
executed every scan and cannot be inside the “If” statement. The measured  
value, therefore, is first written into a temporary variable called "CS115_Freq".  
5
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CS115 Barometric Pressure Sensor  
Once the CS115 is turned on one minute before every hour, and the correct  
measurement is made, it is then copied into the current variable called  
"Pressure". The sensor is then turned off immediately following the  
measurement. In this example, the CR5000 measures the CS115 once every  
hour while measuring other sensors at 10 Hz.  
In Example 5, the 21X turns on the CS115 one minute before the top of the  
hour, and on the hour it measures the CS115 using the pulse count instruction.  
The execution interval should be set at 1 second, and the configuration code for  
Pulse instruction (P3) should be set at 24, Low Level AC, 16-bit, Output in Hz.  
When this option is selected, two adjacent 8-bit pulse counters (Pulse Input  
channels 1 and 2) are combined into one input channel (Pulse Input channel 1)  
to form a 16-bit accumulator. Therefore, Pulse Input channel 2 cannot be used.  
You can also choose to use Pulse Input channel 3, in which case Pulse Input  
channels 4 will be combined with Pulse Input channel 3 to form a 16-bit  
accumulator. In this mode, the 21X’s execution interval must be less than one  
minute. If the execution interval is longer than one minute, you will get an  
error, because the 16-bit pulse accumulator will overflow counting the signal  
from the CS115 when it outputs close to 1100 Hz (1100 mb of barometric  
pressure).  
In the example programs above, the pressure is reported in millibars (mb). To  
report pressure in different units, multiply the measured pressure by the  
appropriate conversion factor using the P37 (Z=X*F) instruction for the  
CR500, CR510, CR10(X), CR23X, 21X and CR7, or by adding an expression  
for the CR5000 and CR9000. See Table 5-1 below for conversion factors.  
TABLE 5-1. Conversion Factors for  
Alternative Pressure Units  
To Find  
hPa  
Multiply by  
1.0  
kPa  
0.1  
mm of Hg  
in of Hg  
psi  
0.75006  
0.02953  
0.0145  
0.00099  
0.75006  
atm  
torr  
6
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CS115 Barometric Pressure Sensor  
5.1 Period Averaging Measurement Examples  
5.1.1 Period Averaging Measurement Example for CR10(X)  
EXAMPLE 1. Sample Program for CR10(X)  
;{CR10X}  
;
*Table 1 Program  
01: 1  
Execution Interval (seconds)  
;Turn on CS115 one minute before the hour  
;
1: If time is (P92)  
1: 59  
2: 60  
3: 48*  
Minutes (Seconds --) into a  
Interval (same units as above)  
Set Port 8* High  
;Measure CS115 at the top of the hour  
;
2: If time is (P92)  
1:  
2: 60  
3: 30  
0
Minutes (Seconds --) into a  
Interval (same units as above)  
Then Do  
3: Period Average (SE) (P27)  
1:  
1
Reps  
2: 14  
3: 6*  
4: 10  
200 kHz Max Freq @ 2 V Peak to Peak, Freq Output  
SE Channel  
No. of Cycles  
5:  
5
Timeout (units = 0.01 seconds)  
6: 1*  
7: 1000  
8: 0.0  
Loc [ P_mb  
Mult  
Offset  
]
;Turn off CS115  
;
4: Do (P86)  
1: 58*  
Set Port 8* Low  
5: End (P95)  
6: If time is (P92)  
1:  
2: 60  
3: 10  
0
Minutes (Seconds --) into a  
Interval (same units as above)  
Set Output Flag High (Flag 0)  
7: Real Time (P77)  
1: 0110  
Day,Hour/Minute (midnight = 0000)  
7
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CS115 Barometric Pressure Sensor  
8: Sample (P70)  
1:  
1
Reps  
2: 1*  
Loc [ P_mb  
]
*Table 2 Program  
02: 0.0000  
Execution Interval (seconds)  
*Table 3 Subroutines  
End Program  
-Input Locations-  
1 P_mb  
* Proper entries will vary with program and datalogger channel, and input location assignments.  
5.1.2 Period Averaging Measurement Example for CR10(X) in a Slow  
Executing Program  
EXAMPLE 2. Sample Program for CR10(X)  
;{CR10X}  
;
*Table 1 Program  
01: 10  
Execution Interval (seconds)  
Set Port 8* High  
;Turn on CS115  
;
1: Do (P86)  
1: 48*  
;Give 2 second delay for CS115 to settle  
;
2: Excitation with Delay (P22)  
1:  
2:  
1
0
Ex Channel  
Delay W/Ex (0.01 sec units)  
Delay After Ex (0.01 sec units)  
mV Excitation  
3: 200  
4:  
0
3: Period Average (SE) (P27)  
1:  
1
Reps  
2: 14  
3: 6*  
4: 10  
200 kHz Max Freq @ 2 V Peak to Peak, Freq Output  
SE Channel  
No. of Cycles  
5:  
5
Timeout (units = 0.01 seconds)  
6: 1*  
7: 1000  
8: 0.0  
Loc [ P_mb  
Mult  
Offset  
]
8
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CS115 Barometric Pressure Sensor  
;Turn off CS115  
;
4: Do (P86)  
1: 58*  
Set Port 8* Low  
5: If time is (P92)  
1:  
2: 60  
3: 10  
0
Minutes (Seconds --) into a  
Interval (same units as above)  
Set Output Flag High (Flag 0)  
6: Real Time (P77)  
1: 0110  
Day,Hour/Minute (midnight = 0000)  
Reps  
7: Sample (P70)  
1:  
1
2: 1*  
Loc [ P_mb  
]
*Table 2 Program  
02: 0.0000  
Execution Interval (seconds)  
*Table 3 Subroutines  
End Program  
-Input Locations-  
1 P_mb  
* Proper entries will vary with program and datalogger channel, and input location assignments.  
5.1.3 Period Averaging Measurement Example for CR23X  
EXAMPLE 3. Sample Program for CR23X  
;{CR23X}  
;
*Table 1 Program  
01: 1  
Execution Interval (seconds)  
;Turn on CS115 one minute before the hour  
;
1: If time is (P92)  
1: 59  
2: 60  
3: 41*  
Minutes (Seconds --) into a  
Interval (same units as above)  
Set Port 1* High  
;Measure CS115 at the top of the hour  
;
2: If time is (P92)  
1:  
2: 60  
3: 30  
0
Minutes (Seconds --) into a  
Interval (same units as above)  
Then Do  
9
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CS115 Barometric Pressure Sensor  
3: Period Average (SE) (P27)  
1:  
1
Reps  
2: 14  
3: 24*  
4: 10  
200 kHz Max Freq @ 500 mV Peak to Peak, Freq Output  
SE Channel  
No. of Cycles  
5:  
5
Timeout (units = 0.01 seconds)  
6: 1*  
7: 1000  
8: 0.0  
Loc [ P_mb  
Mult  
Offset  
]
;Turn off CS115  
;
4: Do (P86)  
1: 51*  
Set Port 1* Low  
5: End (P95)  
6: If time is (P92)  
1:  
2: 60  
3: 10  
0
Minutes (Seconds --) into a  
Interval (same units as above)  
Set Output Flag High (Flag 0)  
7: Real Time (P77)  
1: 0110  
Day,Hour/Minute (midnight = 0000)  
Reps  
8: Sample (P70)  
1:  
1
2: 1*  
Loc [ P_mb  
]
*Table 2 Program  
02: 0.0000  
Execution Interval (seconds)  
*Table 3 Subroutines  
End Program  
-Input Locations-  
1 P_mb  
1 1 1  
* Proper entries will vary with program and datalogger channel, and input location assignments.  
10  
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CS115 Barometric Pressure Sensor  
5.1.4 Period Averaging Measurement Example for CR5000 in a Fast  
Executing Program at 10Hz  
EXAMPLE 4. Sample Program for CR5000  
‘CR5000  
'
'Sample Program to Measure CS115 Barometric Pressure Sensor  
'
'
Public CS115_Freq, Pressure  
Units Pressure = mb  
BeginProg  
Scan (100,mSec,3,0)  
'Turn CS115 ON one minute before every hour  
'
If (IfTime (59,60,min)) Then WriteIO (1,1)  
'Period Avgeraging instruction must be executed every scan, and  
'cannot be inside the "If" statement. The measured value, therefore, is  
'first written into a temporary variable called "CS115_Freq".  
PeriodAvg (CS115_Freq,1,mV5000,33,0,1,10,20,1.0,0)  
'Once CS115 is turned on one minute before every hour, and  
'the correct measurement is made, it is copied into the current variable  
'called "Pressure". The sensor is, then, turned off.  
'
If IfTime(0,60,min) Then  
Pressure = CS115_Freq  
'Turns CS115 OFF  
'
WriteIO (1,0)  
EndIf  
NextScan  
EndProg  
11  
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CS115 Barometric Pressure Sensor  
5.2 Pulse Count Measurement Example  
5.2.1 Pulse Count Measurement Example for 21X  
EXAMPLE 5. Sample Program for 21X  
;{21X}  
;
*Table 1 Program  
01: 1  
Execution Interval (seconds)  
1: If time is (P92)  
1: 59  
2: 60  
Minutes into a  
Minute Interval  
Set Port 6* High  
3: 46*  
2: If time is (P92)  
1:  
2: 60  
3: 30  
0
Minutes into a  
Minute Interval  
Then Do  
3: Pulse (P3)  
1:  
1
Reps  
2: 1*  
3: 24  
4: 1*  
Pulse Input Channel  
Low Level AC, 16 Bit, Output Hz  
Loc [ P_mb  
Mult  
]
5:  
1
6: 0.0  
Offset  
4: Do (P86)  
1: 56*  
Set Port 6* Low  
5: End (P95)  
6: If time is (P92)  
1:  
0
Minutes into a  
2: 60  
3: 10  
Minute Interval  
Set Output Flag High  
7: Real Time (P77)  
1: 0110  
Day,Hour/Minute (midnight = 0000)  
8: Resolution (P78)  
1:  
1
High Resolution  
Reps  
9: Sample (P70)  
1:  
2:  
1
1
Loc [ P_mb  
]
*Table 2 Program  
02: 0.0000  
Execution Interval (seconds)  
12  
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CS115 Barometric Pressure Sensor  
*Table 3 Subroutines  
End Program  
-Input Locations-  
1 P_mb  
1 1 1  
* Proper entries will vary with program and datalogger channel, and input location assignments.  
5.3 Output Resolution  
When storing the values from the CS115 to a datalogger’s final storage  
location, or to a data table, care must be taken to choose suitable scaling of the  
reading or to store the value with adequate resolution to avoid losing useful  
resolution of the pressure measurement. The default resolution (Low  
Resolution) for the Campbell Scientific dataloggers is limited to a maximum of  
four digits. Even then the maximum digit value that can be displayed is 6999  
(7999 for the CR5000/9000 dataloggers). If you use this option with  
barometric data scaled in millibars (hPa), a reading above 699.9 mb (799.9 mb  
for CR5000/9000) will lose one digit of resolution, e.g. at 900mb, the  
resolution is limited to 1 mb.  
To retain 0.1 mb resolution, you either need to deduct a fixed offset from the  
reading before it is stored to avoid exceeding the 699.9 (or 799.9) threshold, or  
output the barometric reading in high resolution format. This can be done by  
using the Resolution (P78) instruction in the CR500, CR510, CR10(X),  
CR23X, CR7 and 21X dataloggers, or the IEEE4 format for the CR5000 and  
CR9000.  
6. Correcting Pressure to Sea Level  
The weather service, most airports, radio stations, and television stations reduce  
the atmospheric pressure to a common reference (sea level). Equation 1 can be  
used to find the difference in pressure between the sea level and the site. That  
value (dP) is then added to the offset (0.0 mb) in the measurement instruction.  
U. S. Standard Atmosphere and dry air were assumed when Equation 1 was  
derived (Wallace, J. M. and P. V. Hobbes, 1977: Atmospheric Science: An  
Introductory Survey, Academic Press, pp. 59-61).  
5.25328  
E
dP = 1013.25 11−  
(1)  
44307.69231  
The value dP is in millibars and the site elevation, E, is in meters. Add dP  
value to the offset in the measurement instruction.  
Use Equation (2) to convert feet to meters.  
E(ft)  
E(m) =  
(2)  
3.281ft m  
13  
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CS115 Barometric Pressure Sensor  
The corrections involved can be significant: e.g., at 1000 mb and 20°C,  
barometric pressure will decrease by 1.1 mb for every 10 meter increase in  
altitude.  
7. Maintenance and Calibration  
Since the sensor is semi-sealed, minimum maintenance is required.  
1. Visually inspect the cable connection to ensure it is clean and dry.  
2. Ensure that the ground connection (shield) is secure and clean.  
3. Visually inspect the casing for damage.  
4. Ensure that the pneumatic connection and pipe are secure and undamaged.  
The external case can be cleaned with a damp, lint-free cloth and a mild  
detergent solution.  
Druck recommends recalibrating the CS115 every year. Contact Campbell  
Scientific, Inc., phone (435) 753-2342, for an RMA number before returning  
the sensor for recalibration. You may also return the unit directly to Druck  
USA for recalibration.  
Should you lose the five terminal connector (p/n 16004), the replacement part  
can be purchased from Campbell Scientific, Inc. Contact Campbell Scientific,  
Inc. to purchase the part.  
The CS115 is sensitive to static when the backplate is  
removed. To avoid damage, take adequate anti-static  
measures when handling.  
CAUTION  
14  
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Campbell Scientific Companies  
Campbell Scientific, Inc. (CSI)  
815 West 1800 North  
Logan, Utah 84321  
UNITED STATES  
Campbell Scientific Africa Pty. Ltd. (CSAf)  
PO Box 2450  
Somerset West 7129  
SOUTH AFRICA  
Campbell Scientific Australia Pty. Ltd. (CSA)  
PO Box 444  
Thuringowa Central  
QLD 4812 AUSTRALIA  
Campbell Scientific do Brazil Ltda. (CSB)  
Rua Luisa Crapsi Orsi, 15 Butantã  
CEP: 005543-000 São Paulo SP BRAZIL  
Campbell Scientific Canada Corp. (CSC)  
11564 - 149th Street NW  
Edmonton, Alberta T5M 1W7  
CANADA  
Campbell Scientific Ltd. (CSL)  
Campbell Park  
80 Hathern Road  
Shepshed, Loughborough LE12 9GX  
UNITED KINGDOM  
Campbell Scientific Ltd. (France)  
Miniparc du Verger - Bat. H  
1, rue de Terre Neuve - Les Ulis  
91967 COURTABOEUF CEDEX  
FRANCE  
Campbell Scientific Spain, S. L.  
Psg. Font 14, local 8  
08013 Barcelona  
SPAIN  
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