Campbell CS100 User manual

CS 100
Barometric Pressure Sensor
Revision
: 03/2020
Copyright ©
2002 – 2020
Campbell Scientific, Inc.

i
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
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1. Introduction................................................................ 1
2. Precautions................................................................ 1
3. Initial Inspection ........................................................ 1
4. QuickStart .................................................................. 1
5. Overview .................................................................... 3
6. Specifications ............................................................ 5
6.1 Performance .........................................................................................5
6.1.1 Performance for “Standard” Range Option...................................5
6.1.2 Performance for 500 to 1100 hPa Range Option ..........................5
6.1.3 Performance for 800 to 1100 hPa Range Option ..........................5
6.2 Electrical ..............................................................................................6
6.3 Physical ................................................................................................6
7. Installation ................................................................. 6
7.1 Venting and Condensation ...................................................................6
7.2 Mounting..............................................................................................7
7.3 Wiring ..................................................................................................7
7.3.1 5-pin Screw Terminal Plug Connector..........................................7
7.3.2 Data Logger Connection ...............................................................8
7.4 Programming........................................................................................9
7.4.1 CRBasic Instructions.....................................................................9
8. Operations ............................................................... 10
8.1 Conversion Factors.............................................................................10
8.2 Long Cable Lengths ...........................................................................10
8.3 Output Resolution ..............................................................................11
8.4 Correcting Pressure to Sea Level .......................................................11
9. Maintenance and Calibration .................................. 11
Appendices
A. Importing Short Cut Code Into CRBasic Editor... A-1
B. Example Programs ................................................ B-1
B.1 CR1000X Program Using Sequential Mode ....................................B-1
B.2 CR1000X Program Using Pipeline Mode ........................................B-2

Table of Contents
ii
Figures
5-1. CS100 Barometric Pressure Sensor......................................................4
7-1. ENC100 is a very small enclosure that can house one CS100 .............7
7-2. Connector key attached to 5-pin screw terminal plug connector .........8
7-3. CS100 and cable with warning label....................................................8
Tables
7-1. Wire Color, CS100 Connection, and Data Logger Connection............9
7-2. Multipliers and Offsets.......................................................................10
8-1. Conversion Factors for Alternative Pressure Units ............................10
B-1. Wiring for Example Programs .........................................................B-1
CRBasic Examples
B-1. CR1000X Program Using Sequential Mode ....................................B-1
B-2. CR1000X Program Using Pipeline Mode ........................................B-2

1
CS100 Barometric Pressure Sensor
1. Introduction
The CS100 measures barometric pressure for the range of 600 to 1100 hPa.
This range equates to from below sea level (as in a mine) up to 3658 m (12,000
feet) above sea level. Designed for use in environmental applications, the
CS100 is compatible with all Campbell Scientific data loggers.
This manual provides information only for CRBasic data loggers.
For retired Edlog data logger support, see an older manual at
www.campbellsci.com/old-manuals.
2. Precautions
•READ AND UNDERSTAND the Safety section at the back of this
manual.
•Warning: Failure to protect the sensor from condensation may result in
permanent damage.
•Warning: Improper wiring may damage the CS100 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, contact Campbell
Scientific.
•Although the CS100 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 CS100, inspect the packaging and contents for
damage. File damage claims with the shipping company.
4. QuickStart
A video that describes data logger programming using Short Cut is available at:
www.campbellsci.com/videos/cr1000x-datalogger-getting-started-program-
part-3. Short Cut is an easy way to program your data logger to measure the
CS100 and assign data logger wiring terminals. Short Cut is available as a
download at www.campbellsci.com. It is included in installations of LoggerNet,
RTDAQ, PC400, and PC200W.
NOTE

CS100 Barometric Pressure Sensor
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The following procedure also describes programming with Short Cut.
1. Open Short Cut and click Create New Program.
2. Double-click the data logger model.
3. In the Available Sensors and Devices box, type CS100, or locate the
sensor in the Sensors > Meteorological > Barometric Pressure folder.
Double-click CS100 Barometric Pressure Sensor. Type the Sea Level
Elevation Correction. If not using the standard range, select another
Barometer Pressure Range. The default units for the sea level elevation
correction is meters; this can be changed by clicking the Elevation
Correction Units box and selecting Feet. Defaults for the barometric
pressure measurement and frequency of the measurement are mmHg and
Hourly, consecutively. These can be changed by clicking the Barometric
Pressure and Measure sensor boxes and selecting different values.
4. Click on the Wiring tab to see how the sensor is to be wired to the data
logger. Click OK after wiring the sensor.
Improper wiring may damage the CS100 beyond repair.
WARNING

CS100 Barometric Pressure Sensor
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5. Repeat steps three and four for other sensors. Click Next.
6. In Output Setup, enter the scan rate, Data Output Storage Intervals,
and meaningful table names.
7. Select the measurement and its associated output options.
8. Click Finish and save the program. Send the program to the data logger if
the data logger is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor
in the data display in LoggerNet, RTDAQ, PC400, or PC200W to make
sure it is making reasonable measurements.
5. Overview
The CS100 is a capacitive pressure transducer that uses the Setra’s electrical
capacitor technology for barometric pressure measurements. The transducer is
encased in a stainless steel and polyester case fitted with an 1/8-inch barbed
fitting for pressure connection (FIGURE 5-1).

CS100 Barometric Pressure Sensor
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FIGURE 5-1. CS100 Barometric Pressure Sensor
The compact and rugged polyester housing contains two closely-spaced,
parallel, electrically-isolated 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). Campbell Scientific data loggers
can directly measure the analog signal generated by the barometer.
The standard measurement range is 600 to 1100 hPa. Other available
measurement ranges are 500 to 1100 hPa and 800 to 1100 hPa. Please contact
Campbell Scientific to order these special versions.
The CS100 is supplied in the triggered mode that allows the data logger to
switch 12 VDC power to the barometer before the measurement. The data
logger then powers down the barometer after the measurements to conserve
power.
If the CS100 and data logger will be housed in different enclosures, the
CABLE5CBL-L should be used instead of the cable that is shipped with the
CS100. The CABLE5CBL-L has a user-specified length; if pertinent, see
Section 8.2, Long Cable Lengths (p. 10).
Features:
•Integral switching circuit limits power consumption to measurement
cycle
•Calibration NIST traceable
•Meets CE conformance standards
•Compatible with Campbell Scientific CRBasic data loggers:
GRANITE-series, CR6, CR3000, CR1000X, CR800-series, CR300-
series, CR1000

CS100 Barometric Pressure Sensor
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6. Specifications
6.1 Performance
Operating Temperature Range: –40 to 60 °C (–40 to 140 °F)
Storage Temperature Range: –60 to 120 °C (–76 to 248 °F)
Proof Pressure: 1500 hPa
Burst Pressure: 2000 hPa
Humidity Range: non-condensing (up to 95% RH)
Media Compatibility: non-corrosive, non-condensing air or gas
Resolution: 0.01 hPa
6.1.1 Performance for “Standard” Range Option
Measurement Range: 600 to 1100 hPa (mBar)
Total Accuracy1:±0.5 hPa @ 20 °C
±1.0 hPa @ 0 to 40 °C
±1.5 hPa @ –20 to 50 °C
±2.0 hPa @ –40 to 60 °C
Linearity: ±0.4 hPa
Hysteresis: ±0.05 hPa
Repeatability: ±0.03 hPa
Long-term Stability: ±0.1 hPa per year
1The root sum squared (RSS) of end point non-linearity, hysteresis, non-repeatability
and calibration uncertainty.
6.1.2 Performance for 500 to 1100 hPa Range Option
Measurement Range: 500 to 1100 hPa
Total Accuracy1:±0.6 hPa @ 20 °C
±1.2 hPa @ 0 to 40 °C
±2.0 hPa @ –20 to 50 °C
±2.5 hPa @ –40 to 60 °C
Linearity: ±0.5 hPa
Hysteresis: ±0.06 hPa
Repeatability: ±0.04 hPa
1The root sum squared (RSS) of end point non-linearity, hysteresis, non-repeatability
and calibration uncertainty.
6.1.3 Performance for 800 to 1100 hPa Range Option
Measurement Range: 800 to 1100 hPa
Total Accuracy1:±0.3 hPa @ 20 °C
±0.6 hPa @ 0 to 40 °C
±1.0 hPa @ –20 to 50 °C
±1.5 hPa @ –40 to 60 °C
Linearity: ±0.25 hPa

CS100 Barometric Pressure Sensor
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Hysteresis: ±0.03 hPa
Repeatability: ±0.02 hPa
1The root sum squared (RSS) of end point non-linearity, hysteresis, non-repeatability
and calibration uncertainty.
6.2 Electrical
Supply Voltage: 9.5 to 28 VDC
External Trigger Voltage
Sleep Mode: 0 VDC
Operating Mode: 3 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 s from shutdown mode
Response Time: <100 ms
6.3 Physical
Dimensions (Main Box): 9.1 x 6.1 x 2.5 cm (3.6 x 2.4 x 1.0 in)
Weight: 135 g (4.8 oz)
Mounting Hole Centers: 7.62 cm (3 in)
Pressure Connector: 1/8 in ID barbed fitting
7. Installation
If you are programming your data logger with Short Cut, skip Section 7.3,
Wiring (p. 7), and Section 7.4, Programming (p. 9). Short Cut does this work for
you. See Section 4, QuickStart (p. 1), for a Short Cut tutorial.
7.1 Venting and Condensation
To prevent condensation, install the sensor in an environmentally protected
enclosure, complete with desiccant, which should be changed at regular
intervals.
Failure to protect the sensor from condensation may result
in permanent damage.
The CS100 is typically mounted in a Campbell Scientific enclosure next to the
data logger. Campbell Scientific also offers the ENC100 for situations where it
is desirable to house the CS100 in its own enclosure. The ENC100 is a small
enclosure with dimensions of 17.1 x 14.0 x 9.9 cm (6.7 x 5.5 x 3.9 in). It
includes a compression fitting for cable entry, a vent for equalization with the
atmosphere, a backplate for mounting the CS100, and hardware for mounting
the ENC100 to a tripod, tower, or pole (see FIGURE 7-1).
CAUTION

CS100 Barometric Pressure Sensor
7
FIGURE 7-1. ENC100 is a very small enclosure that can house one
CS100
For the sensor to detect the external ambient pressure, the enclosure must vent
to the atmosphere (not be hermetically sealed), which may require the addition
of 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.
7.2 Mounting
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.
7.3 Wiring
7.3.1 5-pin Screw Terminal Plug Connector
The CS100 is shipped with a cable that connects to the CS100 using a 5-pin
screw terminal plug connector. The cable is shipped with a connector key
attached to the connector to help ensure the connector is correctly plugged into
the CS100 (see FIGURE 7-2). The connector should easily plug into the
barometer.