CS105/CS105MD Barometric Pressure Sensor Revision: 3/07 C o p y r i g h t © 1 9 9 5 - 2 0 0 7 C a m p b e l l S c i e n t i f i c , I n c .
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.
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 ...............................................................
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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.
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.
CS105/CS105MD Barometric Pressure Sensor FIGURE 1. CS105 Mounted on the Backplate of an ENC12/14 Enclosure, and Connected to a CR1000 Datalogger Logan, Utah INTERNAL BATTERY BPALK 12V ALKALINE BATTERY PACK TEMPARARY BATTER MADE IN USA P4450003 0-5 VDC SUPPLY 10-30 VDC VAISALA MADE IN FINLAND EXT. TRIG 800-1060 hPa OUTPUT AGND RANGE VOUT PTB100A SERIAL NO SUPPLY MODEL GND PRESSURE TRANSMITTER FIGURE 2.
CS105/CS105MD Barometric Pressure Sensor 600-1060 hPa OUTPUT 0-2.5 VDC SUPPLY 10-30 VDC VAISALA MADE IN FINLAND VOUT RANGE SUPPLY P4450003 AGND PTB101B SERIAL NO EXT. TRIG MODEL GND PRESSURE TRANSMITTER See Table 1 Blue - Pressure (VOUT) See Table 1 Yellow - Signal Ground (AGND) Continuous 12 VDC Red - 12 VDC (SUPPLY) See Table 1 Black - Power Ground (GND) Control Port or Excitation Channel Green - Control (EXT. TRIG) Ground Clear - Shield (SCREW ON CASE) FIGURE 3.
CS105/CS105MD Barometric Pressure Sensor 600-1060 hPa OUTPUT 0-2.5 VDC SUPPLY 10-30 VDC VAISALA MADE IN FINLAND VOUT RANGE SUPPLY P4450003 AGND PTB101B SERIAL NO EXT. TRIG MODEL GND PRESSURE TRANSMITTER 6H Green - Pressure (VOUT) 6L White - Signal Ground (AGND) 12 V Switch Red - 12 VDC (SUPPLY) GND Black - Power Ground (GND) FIGURE 4.
CS105/CS105MD Barometric Pressure Sensor 4. Programming 4.1 CS105MD Programming the MetData1 station for the CS105MD is done through Campbell Scientific’s Short Cut program. Short Cut includes code in the .DLD file to correct for elevation. 4.2 CS105 Atmospheric pressure changes little with time. In most weather station applications measuring pressure once an hour is adequate. In Examples 1 and 2 the datalogger turns on the CS105 one minute before the top of the hour with a control port.
CS105/CS105MD Barometric Pressure Sensor Example 1. CR1000 Program for Measuring the CS105 Once Every Hour 'Main Program BeginProg Scan(5,Sec,1,0) 'CS105 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,_50Hz,0.184,600.0) BP_mmHg=BP_mmHg*0.75006 PortSet(1,0) EndIf 'Call Data Tables and Store Data NextScan EndProg Example 2.
CS105/CS105MD Barometric Pressure Sensor 07: Real Time (P77) 1: 0110 Day,Hour/Minute 08: Sample (P70) 1: 1 Reps 2: 1* Loc [ P_mb ] -Input Locations1 P_mb * Proper entries will vary with program and datalogger channel, and input location assignments. ** On the 21X use the 5000 mV slow range. Example 3.
CS105/CS105MD Barometric Pressure Sensor -Input Locations1 P_mb * Proper entries will vary with program and datalogger channel, and input location assignments. ** On the 21X use the 5000 mV slow range. Example 4. 21X Program for Measuring the CS105 Every Execution Interval Using an Excitation Channel to Turn the CS105 On and Off. ;{21X} ; *Table 1 Program 01: 2 Execution Interval (seconds) 01: Excite Delay Volt (SE) (P4) 1: 1 Reps 2: 5 SE Channel 4: 1* Excite all reps w/Exchan 1 5: 100 Delay (units 0.
CS105/CS105MD Barometric Pressure Sensor Example 5.
CS105/CS105MD Barometric Pressure Sensor 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 the measurement instruction. U. S. Standard Atmosphere and dry air were assumed when Equation 1 was derived (Wallace, J. M. and P. V.
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Appendix A. Daily Average If the CS105 will be measured every minute or faster, and a daily average is required, follow Example 5. In Example 5 the daily average, maximum, and minimum pressure is recorded at midnight. A constant is subtracted from the pressure before the average instruction is executed. This prevents the loss of significant digits when adding small numbers to large numbers in floating point arithmetic. Example 5.
Appendix A.
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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 www.csafrica.co.za cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA) PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA www.campbellsci.com.au info@campbellsci.com.au Campbell Scientific do Brazil Ltda.
