Campbell CS106 User manual

CS106
Barometric
Pressure Sensor
User Manual
Issued 5.12.12
Copyright ©1995-2012 Campbell Scientific Inc.
Printed under licence by Campbell Scientific Ltd.
CSL 713

Guarantee
This equipment is guaranteed against defects in materials and workmanship.
This guarantee applies for twelve months from date of delivery. We will
repair or replace products which prove to be defective during the guarantee
period provided they are returned to us prepaid. The guarantee will not apply
to:
•Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific
•Batteries
•Any product which has been subjected to misuse, neglect, acts of God or
damage in transit.
Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred
in removing and/or reinstalling equipment. This guarantee and the Company’s
obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.
Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a
“Declaration of Hazardous Material and Decontamination” form will be
issued for completion.
When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.
Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.
Campbell Scientific Ltd,
Campbell Park, 80 Hathern Road,
Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.campbellsci.co.uk

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the
North American market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.
Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please
note, however, that when a power supply adapter is ordered it will be suitable for use in your country.
Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.
Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.
Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse
but sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, Campbell Park, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone] Fax: [phone]
Email: [email protected]
www.campbellsci.co.uk

i
Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction.................................................................1
2. Cautionary Statements...............................................1
3. Initial Inspection .........................................................1
4. Quickstart....................................................................1
4.1 Step 1 — Mount Sensor to an Enclosure Backplate .............................1
4.2 Step 2 — Use SCWin Short Cut to Program Datalogger and
Generate Wiring Diagram..................................................................2
5. Overview......................................................................5
6. Specifications .............................................................5
6.1 Operating Range.....................................................................................5
6.2 Accuracy.................................................................................................6
6.3 General ...................................................................................................6
7. Installation...................................................................7
7.1 Jumper Settings......................................................................................7
7.2 Enclosure Considerations.......................................................................8
7.3 Wiring.....................................................................................................9
7.3.1 Datalogger Connection...................................................................9
7.3.2 5-pin Screw Terminal Plug Connector.........................................10
7.4 Programming........................................................................................11
7.4.1 Conversion Factors.......................................................................11
7.4.2 Program Examples........................................................................11
7.4.2.1 CRBasic Example 1: CR1000 Program Using
Sequential Mode.............................................................11
7.4.2.2 CRBasic Example 2: CR1000 Program Using
Pipeline Mode ................................................................12
7.4.2.3 Edlog Example: CR10X Program.....................................13
7.4.3 Long Lead Lengths.......................................................................14
7.4.4 Output Resolution.........................................................................14
7.5 Correcting Pressure to Sea Level.........................................................15
8. Maintenance and Calibration...................................15

ii
Figures
7-1. CS106 jumper set to shutdown mode....................................................7
7-2. ENC100 is a very small enclosure that can house one CS106..............8
7-3. CS106 wiring diagram...........................................................................9
7-4. Connector key attached to 5-pin screw terminal plug connector........10
Tables
7-1. Signal and Ground Connectors for CS106..........................................10
7-2. Conversion Factors for Alternative Pressure Units.............................11

1
CS106 Barometric Pressure Sensor
1. Introduction
The CS106 measures barometric pressure for the range of 500 to 1100 mb. This
range equates to from below sea level (as in a mine) to over 15,000 feet above sea
level. Designed for use in environmental applications, the CS106 is compatible
with all Campbell Scientific dataloggers.
Before using the CS106, please study
•Section 2, Cautionary Statements
•Section 3, Initial Inspection
•Section 4, Quickstart
More details are available in the remaining sections.
2. Cautionary Statements
•Warning: Failure to protect the sensor from condensation may result in
permanent damage.
•Warning: Improper wiring may damage the CS106 beyond repair.
•Care should be taken when opening the shipping package to not damage or
cut the cable jacket. If damage to the cable is suspected, consult with a
Campbell Scientific applications engineer.
•Although the CS106 is rugged, it should be handled as a precision scientific
instrument.
•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.
3. Initial Inspection
•Upon receipt of the CS106, inspect the packaging and contents for damage.
File damage claims with the shipping company.
4. Quickstart
4.1 Step 1 — Mount Sensor to an Enclosure Backplate
The mounting holes for the sensor are one-inch-centred (three inches apart), and
will mount directly onto the holes on the backplate of 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.

CS106 Barometric Pressure Sensor
2
4.2 Step 2 — Use SCWin Short Cut to Program Datalogger and
Generate Wiring Diagram
The simplest method for programming the datalogger to measure the CS106 is to
use Campbell Scientific's SCWin Short Cut Program Generator.
1. Open Short Cut and click on New Program.
2. Select a datalogger and scan interval.

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3. Select CS106 Barometric Pressure Sensor then click the right arrow in the
middle of the page to add the sensor to the list of sensors to be measured.
4. Define the name of the public variables. Variable defaults to BP_mmHg that
holds the barometric pressure measurements. Select the desired units of
measure, sea level elevation correction, elevation correction units, and
whether the sensor should be measured hourly.

CS106 Barometric Pressure Sensor
4
5. Choose the outputs for the barometric pressure and then select finish.
6. Remove the yellow warning label from the pigtails and wire according to the
wiring diagram generated by SCWin Short Cut.
Improper wiring may damage the CS106 beyond repair.
WARNING

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5
5. Overview
The CS106 uses Vaisala’s Barocap®silicon capacitive pressure sensor, which has
been designed for accurate and stable measurement of barometric pressure. This
barometer is encased in a plastic shell (ABS/PC blend) fitted with an intake valve
for pressure equalization.
The CS106 outputs a linear 0 to 2.5 VDC signal that corresponds to 500 to 1100
mb. It can be operated in a shutdown or normal mode (see Section 7.1, Jumper
Settings). In the shutdown mode the datalogger switches 12 VDC power to the
barometer during the measurement. The datalogger then powers down the
barometer between measurements to conserve power.
If the CS106 and datalogger will be housed in different enclosures, the
CABLE5CBL should be used instead of the cable that is shipped with the CS106.
The CABLE5CBL can terminate in:
•Pigtails that connect directly to a Campbell Scientific datalogger (option
–PT).
•Connector that attaches to a prewired enclosure (option –PW). Refer to
www.campbellsci.com/prewired-enclosures for more information.
6. Specifications
Features:
•Integral switching circuit limits power consumption to measurement
cycle
•Compatible with all Campbell Scientific dataloggers (including the
CR200(X) series)
Compatibility
Dataloggers: CR200(X) series
CR800 series
CR1000
CR3000
CR5000
CR9000(X)
CR7X
CR510
CR10(X)
CR23X
21X
6.1 Operating Range
Pressure: 500 mb to 1100 mb
Temperature: -40°to +60°C
Humidity: non-condensing

CS106 Barometric Pressure Sensor
6
6.2 Accuracy
Total Accuracy***: ±0.3 mb @ +20°C
±0.6 mb @ 0°to +40°C
±1 mb @ -20°to +45°C
±1.5 mb @ -40°to +60°C
Linearity*: ±0.25 mb @ 20°C
Hysteresis*: ±0.03 mb @ 20°C
Repeatability*: ±0.03 mb @ 20°C
Calibration Uncertainty**: ±0.15 mb @ 20°C
Long-Term Stability: ±0.1 mb per year
* Defined as ±2 standard deviation limits of end-point non-linearity, hysteresis
error, or repeatability error
** Defined as ±2 standard deviation limits of inaccuracy of the working standard
at 1000 mb in comparison to international standards (NIST)
*** Defined as the root sum of the squares (RSS) of end-point non-linearity,
hysteresis error, repeatability error and calibration uncertainty at room
temperature
6.3 General
Dimensions: 9.7 x 6.8 x 2.8 cm (3.8 x 2.7 x 1.1 in)
Weight: 90 g (3.2 oz)
Housing Material: ABS/PC blend
Supply Voltage: 10 to 30 Vdc
Supply Voltage Control: When the internal jumper is closed, the CS106 is
on continually. When the jumper is open, the
CS106 can be turned on/off with 5 Vdc/
0 Vdc.
Supply Voltage Sensitivity: negligible
Current Consumption: <4 mA (active); <1 μA (quiescent)
Output Voltage: 0 to 2.5 Vdc
Warm Up Time: 1 s
Pressure Fitting: barbed fitting for 1/8 in I.D. tubing
Overpressure Limit: 2000 mb

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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.
7. Installation
7.1 Jumper Settings
The CS106 can be operated in one of two modes: shutdown and normal. The
mode is selected by a jumper located underneath the plastic cover of the
barometer. When the jumper is not installed, the CS106 is in shutdown mode and
the datalogger turns the CS106 on and off with a control port or excitation
channel; to use the excitation channel the datalogger must be able to provide an
excitation voltage of 5 VDC. When the jumper is installed the CS106 is in normal
mode and powered continuously.
CS106s shipped from Campbell Scientific are configured for
shutdown mode (jumper open).
The location of the jumper is shown in Figure 7-1.
Figure 7-1. CS106 jumper set to shutdown mode
NOTE
NOTE
Jumpe
r

CS106 Barometric Pressure Sensor
8
7.2 Enclosure Considerations
To prevent condensation, install the sensor in an environmentally protected
enclosure, complete with desiccant, which should be changed at regular intervals.
Failure to protect the sensor from condensation may result in
permanent damage.
The CS106 is typically mounted in a Campbell Scientific enclosure next to the
datalogger. Campbell Scientific also offers the ENC100 for situations where it is
desirable to house the CS106 in its own enclosure (see Figure 7-2). The ENC100
is a 6.7-in. x 5.5-in. x 3.7-in. enclosure that includes a compression fitting for
cable entry, a vent for equalization with the atmosphere, a backplate for mounting
the CS106, and hardware for mounting the ENC100 to a tripod, tower, or pole.
Figure 7-2. ENC100 is a very small enclosure that can house one CS106
Remember that for the sensor to detect the external ambient pressure, the
enclosure must vent to the atmosphere (i.e., not be ‘hermetically sealed’).
Enclosures purchased from Campbell Scientific properly vent to the atmosphere.
CAUTION

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For user-supplied enclosures, it may be necessary to make a vent hole
on the outer wall. In this situation, do not make the hole on one of the
vertical side walls, as wind blowing around it can cause transient
changes in pressure.
7.3 Wiring
7.3.1 Datalogger Connection
Before connecting the barometer to the datalogger, a yellow warning label must be
removed from the pigtails. The warning label reminds the user of the importance
of properly connecting the barometer to the datalogger. Wiring is shown in
FIGURE 7-3 and Table 7-1.
See Table 3-1 Blue – Pressure (VOUT)
See Table 3-1 Yellow – Signal Ground (AGND)
Continuous 12 VDC Red – 12 VDC (SUPPLY)
See Table 3-1 Black – Power Ground (GND)
Control Port or Excitation Channel Green – Control (EXT. TRIG)
Ground or Analog Ground Clear – Shield (G or AGND)
Figure 7-3. CS106 wiring diagram
NOTE
See Table 7-1
See Table 7-1
Continuous 12 Vdc
See Table 7-1
Control Port or Excitation Channel
Ground or Analogue Groun
d

CS106 Barometric Pressure Sensor
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Table 7-1. Signal and Ground Connectors for CS106
Wire CS106 Terminal Datalogger Single-Ended Measurement Datalogger Differential Measurement
Blue VOUT S.E. Input High Side of Diff Input
Yellow AGND AG (CR10(X), CR500, CR510)
(Other Dataloggers) Low Side of Diff. Input
Black GND (21X, CR7, CR9000(X))
G (Other Dataloggers) (21X, CR7, CR9000(X)) G (Other Dataloggers)
Green EXT TRIG Control port (use to turn power
on/off) Control port (use to turn power on/off)
Red SUPPLY 12 VDC 12 VDC
Shield Shield G (CR10(X), CR500, CR510)
(Other Dataloggers) G (CR10(X), CR500, CR510) (Other Dataloggers)
Improper wiring may damage the CS106 beyond repair.
7.3.2 5-pin Screw Terminal Plug Connector
The datalogger connects to the CS106 via a 5-pin screw terminal plug connector.
This connector is removable and may be replaced. The replacement connector
may come with a connector key attached to it to ensure that the connector is
plugged into the CS106 right side up (see Figure 7-4). When the connector is
right side up, it will easily plug into the barometer.
Figure 7-4. Connector key attached to 5-pin screw terminal plug connector
A 5-pin screw terminal that is plugged in upside down
will damage the sensor—perhaps beyond repair.
WARNING
WARNING

User Manual
11
7.4 Programming
The CS106 sensor is measured using the singled-ended voltage measurement
instruction (VoltSE() in CRBasic or Instruction 1 in Edlog).
Atmospheric pressure changes little with time. In most weather station
applications measuring pressure once an hour is adequate.
7.4.1 Conversion Factors
In the example programs, the pressure is reported in millibars (mb). To report
pressure in different units, multiply the measured pressure by the appropriate
conversion factor. This is done by including an expression in a CRBasic program
or using Instruction 37 (P37) in an Edlog program. See Table 7-2 below for
conversion factors.
Table 7-2. Conversion Factors for
Alternative Pressure Units
To Fin
d
Multiply by
hPa 1.0
kPa 0.1
mm of Hg 0.75006
in of Hg 0.02953
Psi 0.0145
Atm 0.00099
Torr 0.75006
7.4.2 Program Examples
7.4.2.1 CRBasic Example 1: CR1000 Program Using Sequential Mode
This CR1000 program uses the sequential mode, which is the simplest mode and
can be used for most meteorological applications. Although the example is for the
CR1000, other CRBasic dataloggers, such as the CR200(X), CR800, CR850,
CR3000, and CR9000(X) are programmed similarly. In the example, the CR1000
measures the CS106 once an hour. To do this, the CR1000 uses a control port to
turn on the CS106 one minute before the top of the hour. On the hour, the
datalogger measures the CS106, and then turns the CS106 off. This example
assumes that the jumper is in the default position (open).
'CR1000
'Declare Variables and Units
Public BattV
Public PTemp_C
Public BP_mmHg
Units BattV=Volts
Units PTemp_C=Deg C
Units BP_mmHg=mmHg

CS106 Barometric Pressure Sensor
12
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,10)
Sample(1,BP_mmHg,FP2)
EndTable
DataTable(Table2,True,-1)
DataInterval(0,1440,Min,10)
Minimum(1,BattV,FP2,False,False)
EndTable
'Main Program
BeginProg
'Main Scan
Scan(5,Sec,1,0)
'Default Datalogger Battery Voltage measurement 'BattV'
Battery(BattV)
'Default Wiring Panel Temperature measurement 'PTemp_C'
PanelTemp(PTemp_C,_60Hz)
'CS106 Barometric Pressure Sensor measurement 'BP_mmHg'
If IfTime(59,60,Min) Then PortSet(1,1)
If IfTime(0,60,Min) Then
VoltSE(BP_mmHg,1,mV2500,1,1,0,_60Hz,0.240,500)
BP_mmHg=BP_mmHg*0.75006
PortSet(1,0)
EndIf
'Call Data Tables and Store Data
CallTable(Table1)
CallTable(Table2)
NextScan
EndProg
7.4.2.2 CRBasic Example 2: CR1000 Program Using Pipeline Mode
Although this example is for the CR1000, other CRBasic dataloggers, such as the
CR200(X), CR800, CR850, CR3000, and CR9000(X) are programmed similarly.
In the example, the CR1000 measures the CS106 once an hour in a program that
runs at 1 Hz. In order to keep the CR1000 running in a pipeline mode, the
measurement instruction is placed outside the “If” statement. The measurement is
made every scan, and the measured value is first written into a temporary variable
called "CS106_temp". Once the CS106 is turned on one minute before the hour,
the CS106 starts to make the correct pressure measurements. At the top of the
hour, the correct value is copied into the current variable called "pressure", and the
sensor is turned off immediately.
The program’s integration parameter for the VoltSE() instruction is _60Hz.
However, for Eddy Covariance programs or other datalogger programs that are
executed at a higher frequency, the integration parameter should be 250 µs instead
of _60Hz or _50Hz. This prevents skipped scans.
'CR1000 Datalogger
Public CS106_temp, pressure
Units pressure = mbar
DataTable (met_data,True,-1)
DataInterval (0,60,min,10)
Sample (1,pressure,IEEE4)
EndTable