Campbell Scientific CS105, CS105MD B User Manual

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CS105/CS105M

Barometric Pressure Senso

Revision: 3/07

Copyright © 1995-2007

Campbell Scientific, Inc.

Warranty and Assistance

The CS105/CS105MD 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

act information is for US and International customers residing in countries

cont
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 [phone]. 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 W
Logan, Ut

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

est 1800 North

ah 84321-1784

CS105/CS105MD 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. General .........................................................................1

2. Specifications ..............................................................1

3. Installation and Wiring................................................2

4. Programming ...............................................................6

4.1 CS105MD.................................................................................................6

4.2 CS105 .......................................................................................................6

5. Long Lead Lengths......................................................9

6. Correcting Pressure to Sea Level ............................11

7. Maintenance...............................................................11

Appendix

A. Daily Average .......................................................... A-1

Figures

1. CS105 Mounted on the Backplate of an ENC12/14 Enclosure,

and Connected to a CR1000 Datalogger .................................................3

2. CS105MD Mounted on the Backplate of MetData1 Enclosure..................3

3. CS105 Wiring Diagram..............................................................................4

4. CS105MD Wiring Diagram........................................................................5

Tables

1. Signal and Ground Connectors for CS105 .................................................4

2. Conversion Factors for Alternative Pressure Units ....................................6

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CS105/CS105MD Barometric Pressure Sensor

1. General

The CS105 analog barometer uses Vaisala’s Barocap® silicon capacitive
pressure sensor. The Barocap sensor has been designed for accurate and stable
measurement of barometric pressure. The CS105 outputs a linear 0 to 2.5
VDC signal that corresponds to 600 to 1060 mb. It can be operated in a
powerup or continuous mode. In the powerup 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.

2. Specifications

Operating Range
Pressure: 600 mb to 1060 mb

Temperature: -40°C to +60°C
Humidity: non-condensing

Accuracy
Total Accuracy*** ±0.5 mb @ +20°C

±2 mb @ 0°C to +40°C
±4 mb @ -20°C to +45°C
±6 mb @ -40°C to +60°C
Linearity*: ±0.45 mb @ 20°C
Hysteresis*: ±0.05 mb @ 20°C
Repeatability*: ±0.05 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

General

Dimensions: 9.7 cm x 5.9 cm x 2.1 cm (3.8” x 2.3” x 0.8”)

Weight: 110 g (4 oz)

Housing material: anodized aluminum

1

CS105/CS105MD Barometric Pressure Sensor

Supply Voltage: 10 to 30 VDC

Supply Voltage Control: When enabled with an internal jumper, the CS105 is
on continually. When disabled, the CS105 can be turned on/off with 5 VDC/0
VDC.

Supply voltage sensitivity: Less than 0.1 mb

Current Consumption: <4 mA (active); <1 µA (quiescent)

Output Voltage: 0 to 2.5 VDC

Warm Up Time: 1 second

Pressure fitting: barbed fitting for 1/8” I.D. tubing

Overpressure limit: 2000 mb

NOTE

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.

3. Installation and Wiring

The CS105 can be operated in one of two modes: powerup and continuous.
The mode is selected by a jumper located underneath a black plug on the face
of the barometer. When the jumper is not installed, the CS105 is in powerup
mode and the datalogger turns the CS105 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
CS105 is powered continuously.

NOTE

NOTE

CS105s shipped from Campbell Scientific are configured for
powerup mode (jumper open).

CS105MDs shipped from Campbell Scientific are configured for
continuous power mode (jumper closed).

®

rubber. This

2

NOTE

Mount the CS105 to the backplate in the same enclosure that the datalogger is
located in (Figures 1 and 2).

On the older (grey jacketed) cable pressure (VOUT) was brown
and signal ground (AGND) was white.