Campbell CS106 User Manual

CS106

Barometric

Pressure Sensor

User Manual

Issued 5.12.12

Copyright
Printed under licence by Campbell Scientific Ltd.

1995-2012 Campbell Scientific Inc.

©

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. T he 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 Num ber 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: [e-mail]

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 in

Length: 1 in. (inch) = 25.4 mm

1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km

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, digita l 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 alter n a tives 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.

2

(square inch) = 645 mm2

Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg

Pressure: 1 psi (lb/in

Volume: 1 UK pint = 568.3 ml

1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres

2

) = 68.95 mb

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: [e-mail]

www.campbellsci.co.uk

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: CR10 00 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

i

Figures

Tables

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

7-1. Signal and Ground Connectors for CS106 .......................................... 10

7-2. Conversion Factors for Alternative Pressure Units ............................. 11

ii

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 CS1 06 is compa tible
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 beyon d 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 sup port 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 pr eclude 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 com pany.

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 t he 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.

1

CS106 Barometric Pressure Sensor

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 P rogra m Gene rator.

1. Open Short Cut and click on New Program.

2. Select a datalogger and scan interval.

2

User Manual

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.

3

CS106 Barometric Pressure Sensor

5. Choose the outputs for the barometric pressure and then select finish.

6. Remove the yellow warning label from the pigtails and wire accordi ng to the

wiring diagram generated by SCWin Short Cut.

WARNING

4

Improper wiring may damage the CS106 beyond repair.

5. Overview

User Manual

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 shippe d wit h 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

• Compatible with all Campbell Scientific dataloggers (including the

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

cycle

CR200(X) series)

Temperature: -40° to +60°C

Humidity: non-condensing

5

CS106 Barometric Pressure Sensor

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

** Defined as ±2 standard deviation limits of inaccuracy of the working standard

*** Defined as the root sum of the squares (RSS) of end-point non-linearity,

error, or repeatability error

at 1000 mb in comparison to international standards (NIS T)

hysteresis error, repeatability error and c alibration 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

6

NOTE

r

The black outer jacket of the cable is Santoprene
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 insta lled, 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.

®

rubber. This

User Manual

NOTE

CS106s shipped from Campbell Scientific are configured for
shutdown mode (jumper open).

The location of the jumper is shown in Figure 7-1.

Jumpe

Figure 7-1. CS106 jumper set to shutdown mode

7

CS106 Barometric Pressure Sensor

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.

CAUTION

Failure to protect th e sensor fr om condens ation may r esult 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 w ith t he atmosphere, a backplate for mounting
the CS106, and hardware for mounting the ENC100 to a tripod, tower, or pole.

8

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.

User Manual

d

NOTE

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 m ust 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)

Control Port or Excitation Channel

Ground or Analogue Groun

Ground or Analog Ground Clear – Shield (G or AGND)

See Table 7-1

See Table 7-1

Continuous 12 Vdc

See

Table 7-1

Figure 7-3. CS106 wiring diagram

9

CS106 Barometric Pressure Sensor

Table 7-1. Signal and Ground Connectors for CS106

Wire

Blue VOUT S.E. Input High Side of Diff Input
Yellow AGND

Black GND

Green EXT TRIG

Red SUPPLY 12 VDC 12 VDC
Shield Shield

CS106 Terminal

WARNING

Single-Ended Measurement

AG (CR10(X), CR500, CR510)

G (Other Dataloggers)
Control port (use to turn power

on/off)

G (CR10(X), CR500, CR510)

Improper wiring may damage the CS106 beyond repair.

Datalogger

(Other Dataloggers)
(21X, CR7, CR9000(X))

(Other Dataloggers)

Differential Measurement

Low Side of Diff. Input

(21X, CR7, CR9000(X))

G (Other Dataloggers)
Control port (use to turn power

on/off)

G (CR10(X), CR500, CR510)

(Other Dataloggers)

Datalogger

7.3.2 5-pin Screw Terminal Plug Connector

The datalogger connects to the CS106 via a 5-pin screw term inal 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 si de up (see Figure 7-4). When the connector is
right side up, it will easily plug into the barom eter.

WARNING

10

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.

7.4 Programming

d

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

User Manual

To Fin

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 CR10 00
measures the CS106 once an hour. To do thi s , 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

11

CS106 Barometric Pressure Sensor

'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 datalogger s, suc h as the
CR200(X), CR800, CR850, CR 3000, 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 _60H z.
However, for Eddy Covariance progra m s 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

12

User Manual

BeginProg
PipeLineMode
Scan (1,sec,3,0)

'Measurement is made every scan outside the "If" statement
VoltSE (CS106_temp,1,mV2500,1,False,0,_60Hz,0.240,500)

'Turn on CS106 one minute before the hour
If (IfTime (59,60,min)) Then WriteIO (&b1000,&b1000)

'Copy the correct value to a current variable called "pressure" at the top of the hour
'Turn off CS106 after the measurement
If (IfTime (0,60,min)) Then
pressure = CS106_temp
WriteIO (&b1000,&b0)
EndIf

CallTable met_data

NextScan
EndProg

7.4.2.3 Edlog Example: CR10X Program

Although this example is for the CR10X, other Edlog dataloggers, such as the
CR510, CR23X, 21X, and CR7, are programmed similarly. In the example, the
CR10X turns on the CS106 one minute before the top of the hour using a control
port. On the hour the datalogger measures the CS106, and then it turns the CS106
off.

;{CR10X}

*Table 1 Program
01: 1 Execution Interval (seconds)

;Turn on CS106 one minute before the hour
;

1: If time is (P92)
1: 59 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 41 Set Port 1 High

;Measure CS106 at the top of the hour
;

2: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 30 Then Do

3: Volt (SE) (P1)
1: 1 Reps
2: 25 2500 mV 60 Hz Rejection Range
3: 1 SE Channel
4: 1 Loc [ CS106 ]
5: 0.240 Multiplier
6: 500 Offset

;Turn off CS106
;

4: Do (P86)
1: 51 Set Port 1 Low

5: End (P95)

13

CS106 Barometric Pressure Sensor

;Store CS106 data once an hour
;

6: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)

7: Real Time (P77)
1: 0110 Day,Hour/Minute (midnight = 0000)

;Store in high resolution mode to retain 0.01mb resolution
;

8: Resolution (P78)
1: 1 High Resolution

9: Sample (P70)
1: 1 Reps
2: 1 Loc [ CS106 ]

*Table 2 Program
01: 0 Execution Interval (seconds)

*Table 3 Subroutines

End Program

-Input Locations­1 CS106 1 1 1

7.4.3 Long Lead Lengths

There is a 0.06 mV/foot voltage drop in the CS106 signal leads. This voltage
drop, in long lead lengths, will raise the barometric reading by approximately

1.44 mb per 100 feet.

For lead lengths greater than 20 feet, use the differential instruction (VoltDiff() in
CRBasic or Instruction 2 in Edlog) to mea s ure the CS106.

7.4.4 Output Resolution

When storing the values from the CS106 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 Campbell
Scientific dataloggers is limited to a maximum of four digits. Even then, the
maximum digit value that can be disp layed is 7999 for the CRBasic dataloggers
and 6999 for Edlog dataloggers. If you use this option with barometric data scaled
in millibars (hPa), a reading above 799.9 mb for CRBasic datalogger s (699.9 mb
for Edlog dataloggers) will lose one digit of resolution (e.g. at 900 mb, the
resolution is limited to 1 mb).

To retain 0.01 mb resolution, you either need to subtract a fixed offset from the
reading before it is stored to avoid exceeding the 799.9 for CRBasic datal ogger s
(699.9 for Edlog dataloggers) threshold, or output the barometric reading in high
resolution format. This can be done by using the IEEE4 format for CRBasic
dataloggers or the Resolution (P78) instruc tion in the Edlog dataloggers. The
default data output format for CR200(X) series datalogger is IEEE4.

14

7.5 Correcting Pressure to Sea Level

⎧

The weather service, most airports, radio stations, and television stations adjus t 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 (500 mb in our example programs) 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 Surv ey, Academic Press,
pp. 59-61).

⎪

⎛

.

Eft

.=3 281

⎨

⎜
⎝

⎪

⎩

()

ft m

44307 69231

.

(2)

1013 25 1 1

dPE=−−

The value dP is in millibars and the site elevation, E, is in metres. Add dP value
to the offset in the measurement instruction.

Use Equation (2) to convert feet to metres.

Em

()

5.25328

⎞
⎟

⎠

User Manual

⎫

⎪
⎬

(1)

⎪

⎭

The corrections involved can be significant: e.g. at 1000 mb and 20°C, bar ome tric
pressure will decrease by 1.1 mb for every 10 m etre increase in altitude.

8. 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.
Visually inspect the casing for damage.

2.

3.

Ensure that the pneumatic connection and pipe are secure and undam aged.

The external case can be cleaned with a damp, lint-free cloth and a mild detergent
solution.

Vaisala recommends recalibration every two years under norm al use. In areas
where a lot of contaminants are present, recalibration every year is recommended.

Contact Campbell Scientific for an RMA number before returning the sensor for
recalibration.

Should you lose the five terminal connector (p/n #16004), the replacement part
can be purchased from Campbell Scientific. Contact Campbell Scientific to
purchase the part.

CAUTION

The CS106 is sensitive to static when the backplate is
removed. To avoid damage, take adequate anti-static
measures when handling.

15

CAMPBELL SCIENTIFIC COMPANIES

Campbell Scientific, Inc. (CSI)

815 West 1800 North

Logan, Utah 84321
UNITED STATES

www.campbellsci.com

Campbell Scientific Africa Pty. Ltd. (CSAf)

Somerset West 7129

www.csafrica.co.za

Campbell Scientific Australia Pty. Ltd. (CSA)

QLD 4814 AUSTRALIA

www.campbellsci.com.au

Campbell Scientific do Brazil Ltda. (CSB)

Rua Luisa Crapsi Orsi, 15 Butantã

CEP: 005543-000 São Paulo SP BRAZIL

www.campbellsci.com.br

Campbell Scientific Canada Corp. (CSC)

11564 - 149th Street NW

Edmonton, Alberta T5M 1W7

www.campbellsci.ca

Campbell Scientific Centro Caribe S.A. (CSCC)

300N Cementerio, Edificio Breller

Santo Domingo, Heredia 40305

www.campbellsci.cc • [e-mail]

Campbell Scientific Ltd. (CSL)

Shepshed, Loughborough LE12 9GX

UNITED KINGDOM

www.campbellsci.co.uk

Campbell Scientific Ltd. (France)

3 Avenue de la Division Leclerc

www.campbellsci.fr

Campbell Scientific Spain, S. L.

Avda. Pompeu Fabra 7-9

Local 1 - 08024 BARCELONA

www.campbellsci.es

Campbell Scientific Ltd. (Germany)

Fahrenheitstrasse13, D-28359 Bremen

www.campbellsci.de

Please visit www.campbellsci.com to obtain contact information for your local US or Int ernational representative.

• [e-mail]

PO Box 2450

SOUTH AFRICA

• [e-mail]

PO Box 8108

Garbutt Post Shop

• [e-mail]

• [e-mail]

CANADA

• [e-mail]

COSTA RICA

Campbell Park

80 Hathern Road

• [e-mail]

92160 ANTONY

FRANCE

• [e-mail]

SPAIN

• [e-mail]

GERMANY

• [e-mail]