Campbell CS100 Instruction Manual

CS100 Barometric
Pressure Sensor
Revision: 2/10
Copyright © 2002-2010
Campbell Scientific, Inc.

Warranty and Assistance

The CS100 BAROMETRIC PRESSURE SENSOR is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer shall assume all costs of removing, reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. The following contact information is for US and International customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____ 815 West 1800 North Logan, Utah 84321-1784
For all returns, the customer must fill out a “Declaration of Hazardous Material and Decontamination” form and comply with the requirements specified in it. The form is available from our website at completed form must be either emailed to repair@campbellsci.com 435-750-9579. Campbell Scientific will not process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense. Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.
www.campbellsci.com/repair
. A
or faxed to
CS100 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
2.1.1 Performance for “Standard” Range Option ....................................2
2.1.2 Performance for “500 to 1100 mb” Range Option .........................2
2.1.3 Performance for “800 to 1100 mb” Range Option .........................2
2.2 Electrical...................................................................................................3
2.3 Physical..................................................................................................... 3
3. Installation....................................................................3
3.1 Venting and Condensation........................................................................3
3.2 Mounting ..................................................................................................3
4. Wiring............................................................................4
4.1 Datalogger Connection.............................................................................4
4.2 5-pin Screw Terminal Plug Connector.....................................................5
5. Programming ...............................................................5
5.1 Conversion Factors...................................................................................6
5.2 Multipliers and Offsets for Different Measurement Range Options.........6
5.3 Program Examples....................................................................................7
5.4 Output Resolution.....................................................................................9
6. Correcting Pressure to Sea Level ..............................9
7. Maintenance and Calibration....................................10
Figures
1. CS100 Barometric Pressure Sensor............................................................1
2. CS100 as removed from the box and closeup of yellow warning label......4
3. Connector Key Attached to 5-pin Screw Terminal Plug Connector...........5
Tables
1. Signal and Ground Connectors for CS100 .................................................4
2. Conversion Factors for Alternative Pressure Units ....................................6
3. Multipliers and Offsets...............................................................................6
4. Wiring for Example Programs....................................................................7
i

CS100 Barometric Pressure Sensor

1. Introduction

The CS100 is a capacitive pressure transducer that uses the Setra's electrical capacitor technology for barometric pressure measurements over the 600 to 1100 millibar range. The transducer’s compact and rugged polyester housing with stainless blackplate contains two closely-spaced, parallel, electrically­isolated metallic surfaces. One of the surfaces is essentially a diaphragm constructed of a Setra’s proprietary compound of fused glass and ceramic (Setraceram™) or a low-hysteresis material, such as 17-4 PH SS. The diaphragm is capable of detecting a slight change in the applied pressure, which is then converted to an analog voltage signal by Setra’s custom Application Specific Integrated Circuit (ASIC). The analog signal generated by the barometer can be directly measured by a Campbell Scientific datalogger, such as 21X, CR7, CR500, CR510, CR10(X), CR23X, CR200(X) series, CR1000, CR3000, CR800, CR850, CR5000, and CR9000(X).
The CS100 is supplied in the triggered mode, in which 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.
Other measurement range options such as 500 to 1100 millibar, an d 800 to 1100 millibar are also available. Please contact Campbell Scientific, Inc. for ordering these special versions.
FIGURE 1. CS100 Barometric Pressure Sensor
1
CS100 Barometric Pressure Sensor

2. Specifications

2.1 Performance

2.1.1 Performance for “Standard” Range Option
Measurement Range: 600 mb to 1100 mb (hPa) Operating Temperature Range: -40°C to +60°C (-40°F to +140°F) Storage Temperature Range: -60°C to +120°C (-76°F to +248°F) Proof Pressure: 1500 mb Burst Pressure: 2000 mb Humidity Range: non-condensing (up to 95% RH) Media Compatibility: non-corrosive, non-condensing air or gas Resolution: 0.01 mb Total Accuracy ±1.0 mb @ 0°C to +40°C ±1.5 mb @ -20°C to +50°C ±2.0 mb @ -40°C to +60°C Linearity: ±0.4 mb Hysteresis: ±0.05 mb Repeatability: ±0.03 mb Long-term Stability: ±0.1 mb per year
1
: ±0.5 mb @ 20°C
2.1.2 Performance for “500 to 1100 mb” Range Option
Measurement Range: 500 to 1100 mb Total Accuracy ±1.2 mb @ 0°C to +40°C ±2.0 mb @ -20°C to +50°C ±2.5 mb @ -40°C to +60°C Linearity: ±0.5 mb Hysteresis: ±0.06 mb Repeatability: ±0.04 mb
2
: ±0.6 mb @ 20°C
2.1.3 Performance for “800 to 1100 mb” Range Option
Measurement Range: 800 to 1100 mb Total Accuracy ±0.6 mb @ 0°C to +40°C ±1.0 mb @ -20°C to +50°C ±1.5 mb @ -40°C to +60°C Linearity: ±0.25 mb Hysteresis: ±0.03 mb Repeatability: ±0.02 mb
1
The root sum squared (RSS) of end point non-l inearity, hysteresis, non-
repeatability and calibration uncertainty.
2
The root sum squared (RSS) of end point non-linearity, hysteresis, non-
repeatability and calibration uncertainty.
3
The root sum squared (RSS) of end point non-l inearity, hysteresis, non-
repeatability and calibration uncertainty.
3
: ±0.3 mb @ 20°C
2

2.2 Electrical

2.3 Physical

NOTE
CS100 Barometric Pressure Sensor
Supply Voltage: 9.5 V to 28 Vdc Current Consumption: 3 mA nominal (operating mode) 1 µA quiescent (sleep mode) Signal Output 0 to 2.5 Vdc Warm-up Time: <1 second from shutdown mode Response Time: <100 msec Benefits: Calibration NIST traceable Meets CE conformance standards
Dimensions (Main Box): 3.6” x 2.4” x 1.0” (9.1 x 6.1 x 2.5 cm) Weight: 4.8 oz (135 g) Mounting Hole Centers: 3 inches (7.62 cm) Pressure Connector: 1/8” ID barbed fitting
®
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 building.
rubber. This

3. Installation

3.1 Venting and Condensation

CAUTION
NOTE

3.2 Mounting

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.
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.
The mounting holes for the sensor are one-inch-centered (three inches apart), 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.
3
CS100 Barometric Pressure Sensor

4. Wiring

4.1 Datalogger Connection

Before connecting the barometer to the datalogger, a yellow warning label must be removed from the pigtails (see Figure 2). The warning label reminds the user of the importance of properly connecting the barometer to the datalogger. Proper wiring is shown in Table 1.
Yellow Warning Label
FIGURE 2. CS100 as Removed from the Box
TABLE 1. Signal and Ground Connectors for CS100
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
4
CS100 Terminal
Single-Ended Measurement
AG (CR10(X), CR500, CR510)
(Other Dataloggers) (21X, CR7, CR9000(X))
G (Other Dataloggers) Control port (use to turn power
on/off)
G (CR10(X), CR500, CR510)
(Other Dataloggers)
Datalogger
Datalogger
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)
CS100 Barometric Pressure Sensor
WARNING
Improper wiring may damage the CS100 beyond repair.

4.2 5-pin Screw Terminal Plug Connector

The datalogger connects to the CS100 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 CS100 right side up (see Figure 3). When the connector is right side up, it will easily plug into the barometer.
WARNING

5. Programming

FIGURE 3. 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.
The CS100 sensor is measured using the singled-ended voltage measurement instruction.
Atmospheric pressure changes little with time. In most weather station applications measuring pressure once an hour is adequate.
Program Example 1 is for the dataloggers that use the CRBasic language, such as CR200(X), CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X). In the example, the CR1000 measures the CS100 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 "CS100_temp". Once the CS100 is turned on one minute before the hour, the CS100 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.
5
CS100 Barometric Pressure Sensor
In Program Example 2, the CR10X datalogger (Edlog datalogger) turns on the CS100 one minute before the top of the hour using a control port. On the hour the datalogger measures the CS100, and then it turns the CS100 off.

5.1 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 using the P37 (Z=X*F) instruction for CR500, CR510, CR10(X), CR23X, 21X, and CR7, or by adding an expression for CR200(X), C800, CR850, CR1000, CR3000, CR5000, and CR9000(X) dataloggers. See Table 2 below for conversion factors.
To Find 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
TABLE 2. Conversion Factors for
Alternative Pressure Units

5.2 Multipliers and Offsets for Different Measurement Range Options

For CS100 barometric pressure transducers with measurement range options other than the standard 600 to 1100 mb option, please refer to the table below for proper multipliers and offsets.
TABLE 3. Multipliers and Offsets
Range Options Multiplier Offset 600 to 1100 mb
(Standard range) 500 to 1100 mb 0.24 500 800 to 1100 mb 0.12 800
0.2 600
6
CS100 Barometric Pressure Sensor

5.3 Program Examples

The CS100 wiring instructions for the example programs are shown in Table 4 below.
TABLE 4. Wiring for Example Programs
Wire Color Description CR10(X) CR1000
Blue VOUT – Pressure Signal Out SE6 SE15 Red SUPPLY – 12 Vdc Power In 12V 12V Black GND – Power Ground G G Yellow AGND – Signal Ground AG
Green ETX. TRIG. – External Trigger C8 C4 Clear Shield G G
Example 1. Sample Program for CR1000 (CRBasic) Datalogger
'CR1000 Datalogger
Public CS100_temp Public pressure Units pressure = mbar
DataTable (met_data,True,-1) DataInterval (0,60,min,10) Sample (1,pressure,IEEE4) EndTable
BeginProg Scan (1,sec,3,0)
‘Measurement is made every scan outside the “If” statement
VoltSe (CS100_temp,1,mV2500,15,False,200,250,0.2,600)
‘Turn on CS100 one minute before the hour
If (IfTime (59,60,min)) Then WriteIO (&b1000, &b1 00 0 )
‘Copy the correct value to a current variable called “pressure” at the top of the hour ‘Turn off CS100 after measurement
If (IfTime (0,60,min)) Then pressure = CS100_temp WriteIO (&b1000,&b0) EndIf
CallTable met_data
NextScan EndProg
7
CS100 Barometric Pressure Sensor
Example 2. Sample Program for CR10X (Edlog) Datalogger
;{CR10X} ;
*Table 1 Program 01: 1 Execution Interval (seconds)
;Turn on CS100 one minute before the hour ;
1: If time is (P92) 1: 59 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 48* Set Port 8* High
;Measure CS100 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: 15 2500 mV Fast Range 3: 6 SE Channel 4: 1 Loc [ P_mb ] 5: 0.2 Multiplier 6: 600 Offset
;Turn off CS100 ;
4: Do (P86) 1: 58* Set Port 8* Low
5: End (P95)
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 [ P_mb ]
*Table 2 Program 02: 0.0000 Execution Interval (seconds)
8
CS100 Barometric Pressure Sensor
*Table 3 Subroutines
End Program
-Input Locations­1 P_mb
* Proper entries will vary with program and datalogger channel, and input location assignments.

5.4 Output Resolution

When storing the values from the CS100 to a data table or to a datalogger’s final storage location, 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 displayed is 6999 for Edlog dataloggers, and 7999 for the CRBasic d a taloggers. If you use this option with barometric data scaled in millibars (hPa), a reading above
799.9 mb for CRBasic dataloggers or 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 deduct a fixed offset from the reading before it is stored to avoid exceeding the 799.9 for CRBasic dataloggers or 699.9 for Edlog dat a l og ge rs threshold, or output the barom e t ri c reading in high resolution format. This can be done by using the IEEE4 format for the CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X) dataloggers or using the Resolution (P78) instruction for our Edlog dataloggers. The default data output format for CR200(X) series datalogger is IEEE4.

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 (600 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 Survey, Academic Press, pp. 59-61).
1013 25 1 1
dP
=−
The value dP is in millibars and the site elevation, E, is in meters. Add dP value to the offset in the measurement instruction.
.
⎜ ⎝
E
44307 69231
.
5.25328
⎞ ⎟
⎪ ⎬
(1)
Use Equation (2) to convert feet to meters.
9
CS100 Barometric Pressure Sensor
Eft
Em
()
The corrections involved can be significant: e.g. at 1000mb and 20°C, barometric pressure will decrease by 1.1mb for every 10 meter increase in altitude.
()
.=3281
(2)
ft m

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. Visually inspect the casing for damage.
3. 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.
Contact Campbell Scientific, Inc. (435-753-2342) for an RMA number before returning the sensor for recalibration. You may also return the unit directly to Setra for recalibration.
CAUTION
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 CS100 is sensitive to static when the backplate is removed. To avoid damage, take adequate anti-static measures when handling.
10
Campbell Scientific Companies
Campbell Scientific, Inc. (CSI)
815 West 1800 North
Logan, Utah 84321
UNITED STATES
www.campbellsci.com • info@campbellsci.com
Campbell Scientific Africa Pty. Ltd. (CSAf)
PO Box 2450
Somerset West 7129
SOUTH AFRICA
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PO Box 444
Thuringowa Central
QLD 4812 AUSTRALIA
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Rua Luisa Crapsi Orsi, 15 Butantã
CEP: 005543-000 São Paulo SP BRAZIL
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Campbell Scientific Canada Corp. (CSC)
11564 - 149th Street NW
Edmonton, Alberta T5M 1W7
CANADA
www.campbellsci.ca • dataloggers@campbellsci.ca
Campbell Scientific Centro Caribe S.A. (CSCC)
300 N Cementerio, Edificio Breller
Santo Domingo, Heredia 40305
COSTA RICA
www.campbellsci.cc • info@campbellsci.cc
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Campbell Park
80 Hathern Road
Shepshed, Loughborough LE12 9GX
UNITED KINGDOM
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1, rue de Terre Neuve - Les Ulis
91967 COURTABOEUF CEDEX
FRANCE
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08013 Barcelona
SPAIN
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Please visit www.campbellsci.com to obtain contact information for your local US or International representative.
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