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Campbell CS115 Instruction Manual

Barometric pressure sensor
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CS115
Barometric Pressure Sensor
3/03
C o p y r i g h t
( c )
2 0 0 2 - 2 0 0 3
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell CS115

  • Page 1 CS115 Barometric Pressure Sensor 3/03 C o p y r i g h t ( c ) 2 0 0 2 - 2 0 0 3 C a m p b e l l S c i e n t i f i c ,...
  • Page 2 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...

  • Page 3: Table Of Contents

    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...
  • Page 4 This is a blank page.

  • Page 5: Introduction

    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.

  • Page 6: Specifications

    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 at 20°C ±0.3 mb -10°C to +50°C ±0.5 mb -20°C to +60°C...

  • Page 7: Installation

    3.2 Mounting The mounting holes for the sensor are one-inch-centered, 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.

  • Page 8: Jumper Settings

    Figure 3-1. 3.3 Jumper Settings The CS115 has two operating modes, ‘continuous’ and ‘triggered’. It is normally shipped in the ‘triggered’ mode, in which the unit is turned on and off by applying signal to the blue wire (EXT. TRIG.) using a datalogger’s control port. In this mode, power consumption is minimized, but the sensor is subject to a 2-second ‘warm-up’...

  • Page 9: Wiring

    Clear Shield 5. Programming There are two ways to measure the output of the CS115. The preferred way is to use the period averaging instruction available with the CR500, CR510, CR10(X), CR23X and CR5000 dataloggers. This instruction determines the period of the output signal averaged over a user-specified number of cycles and outputs it in kHz.

  • Page 10: Conversion Factors For Alternative Pressure Units

    In this example, the CR5000 measures the CS115 once every hour while measuring other sensors at 10 Hz. In Example 5, the 21X turns on the CS115 one minute before the top of the hour, and on the hour it measures the CS115 using the pulse count instruction.

  • Page 11: Period Averaging Measurement Examples

    EXAMPLE 1. Sample Program for CR10(X) ;{CR10X} *Table 1 Program 01: 1 Execution Interval (seconds) ;Turn on CS115 one minute before the hour 1: If time is (P92) 1: 59 Minutes (Seconds --) into a 2: 60 Interval (same units as above)

  • Page 12: Period Averaging Measurement Example For Cr10(X) In A Slow Executing Program

    01: 10 Execution Interval (seconds) ;Turn on CS115 1: Do (P86) 1: 48* Set Port 8* High ;Give 2 second delay for CS115 to settle 2: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0 Delay W/Ex (0.01 sec units) 3: 200 Delay After Ex (0.01 sec units)

  • Page 13: Period Averaging Measurement Example For Cr23X

    EXAMPLE 3. Sample Program for CR23X ;{CR23X} *Table 1 Program 01: 1 Execution Interval (seconds) ;Turn on CS115 one minute before the hour 1: If time is (P92) 1: 59 Minutes (Seconds --) into a 2: 60 Interval (same units as above)
  • Page 14 CS115 Barometric Pressure Sensor 3: Period Average (SE) (P27) 1: 1 Reps 2: 14 200 kHz Max Freq @ 500 mV Peak to Peak, Freq Output 3: 24* SE Channel 4: 10 No. of Cycles 5: 5 Timeout (units = 0.01 seconds)

  • Page 15: Period Averaging Measurement Example For Cr5000 In A Fast Executing Program At 10 Hz

    'first written into a temporary variable called "CS115_Freq". PeriodAvg (CS115_Freq,1,mV5000,33,0,1,10,20,1.0,0) 'Once CS115 is turned on one minute before every hour, and 'the correct measurement is made, it is copied into the current variable 'called "Pressure". The sensor is, then, turned off.

  • Page 16: Pulse Count Measurement Example

    CS115 Barometric Pressure Sensor 5.2 Pulse Count Measurement Example 5.2.1 Pulse Count Measurement Example for 21X EXAMPLE 5. Sample Program for 21X ;{21X} *Table 1 Program 01: 1 Execution Interval (seconds) 1: If time is (P92) 1: 59 Minutes into a...

  • Page 17: Output Resolution

    * Proper entries will vary with program and datalogger channel, and input location assignments. 5.3 Output Resolution When storing the values from the CS115 to a datalogger’s final storage location, or to a data table, 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.

  • Page 18: Maintenance And Calibration

    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 CS115 is sensitive to static when the backplate is CAUTION removed. To avoid damage, take adequate anti-static...
  • Page 19 This is a blank page.
  • Page 20 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 sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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