Campbell Hausfeld CS115 User Manual

INSTRUCTION MANUAL

CS115

Barometric Pressure Sensor

3/03

Campbell Scientific, Inc.

Warranty and Assistance

The CS115 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

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

CS115 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

2.2 Electrical...................................................................................................2

2.3 Physical.....................................................................................................2

3. Installation...................................................................3

3.1 Venting and Condensation........................................................................3

3.2 Mounting...................................................................................................3

3.3 Jumper Settings.........................................................................................4

4. Wiring ..........................................................................5

5. Programming ..............................................................5

5.1 Period Averaging Measurement Examples ...............................................7

5.1.1 Period Averaging Measurement Example for CR10(X)..................7

5.1.2 Period Averaging Measurement Example for CR10(X) in a Slow

Executing Program ....................................................................8

5.1.3 Period Averaging Measurement Example for CR23X ....................9

5.1.4 Period Averaging Measurement Example for CR5000 in a Fast

Executing Program at 10 Hz....................................................11

5.2 Pulse Count Measurement Example........................................................12

5.21 Pulse Count Measurement Example for 21X .................................12

5.3 Output Resolution...................................................................................13

6. Correcting Pressure to Sea Level............................13

7. Maintenance and Calibration ................................... 14

Figures

3-1 Mounting CS115.......................................................................................3

3-2 Jumper Settings on CS115........................................................................4

Tables

4-1 Wiring for Example Programs..................................................................5

5-1 Conversion Factors for Alternative Pressure Units...................................6

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CS115 Barometric Pressure Sensor

The CS115 Barometric Pressure Sensor uses the resonant silicon technology pressure sensor developed by Druck. The sensor outputs a variable frequency which can be measured using the datalogger's period averaging instruction or pulse count instruction. The entire process is essentially digital from sensor element to datalogger, ensuring the highest precision and most accurate reading possible.

1. Introduction

The sensor comprises two elements, one acting as a pressure sensitive diaphragm and the other acting as a resonator. Pressure variations deflect the sensitive diaphragm and change the sensor’s resonant frequency. The resonant frequency is measured, corrected for the effects of temperature and nonlinearity, and then output as a frequency signal. The sensor is characterized over the full temperature and pressure range, and the corrections are stored in the sensor's non-volatile memory. It can be operated in a triggered or continuous mode. In the triggered mode 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.

CS115 Barometric Pressure Sensor

2. Specifications

2.1 Performance

Measurement Range: 600 mb to 1100 mb (hPa) Operating Temperature Range: -40°C to +60°C Humidity Range: non-condensing Media Compatibility: non-corrosive gas Total Accuracy

Long-term Stability: <0.11 mb per year (100 ppm) Overpressure Limit: 1375 mb

2.2 Electrical

Supply Voltage: 9.5 V to 24 VDC Current Consumption: 8 mA nominal Output Frequency: 600 Hz to 1100 Hz Frequency Output: -2.5 to +2.5 VDC zero-crossing square wave External Trigger Voltages: ON 1 to 24 VDC

Warm-up Time: <2 seconds (-40°C to +60°C) EMC Compatibility: Emissions – BS EN50081-1

at 20°C ±0.3 mb

-10°C to +50°C ±0.5 mb

-20°C to +60°C ±1.5 mb

-40°C to +60°C ±2.0 mb

OFF 0 VDC

Immunity – BS EN61000-6-2

2.3 Physical

Dimensions (Main Box): 2.36” x 2.36” x 1.15”

(6.0 cm x 6.0 cm x 2.9 cm) Weight: 4.4 oz (125 g) Mounting Hole Centers: 3 inches (7.62 cm) Pressure Connector: 0.16” (0.4 cm) barbed hose

NOTE

Non-linearity, hysteresis, and repeatability over calibrated temperature range

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.

rubber. This

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