CS100 Barometric Pressure Sensor Revision: 8/12 C o p y r i g h t © 2 0 0 2 - 2 0 1 2 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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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction .................................................................1 2. Cautionary Statements...............................................1 3. Initial Inspection .........................................................1 4. Quickstart ....................................................................1 4.1 4.
Table of Contents Figures 5-1. 7-1. 7-2. 7-3. CS100 Barometric Pressure Sensor..................................................... 5 ENC100 is a very small enclosure that can house one CS100 ............ 8 CS100 as removed from the box ......................................................... 9 Connector key attached to 5-pin screw terminal plug connector....... 10 7-1. 7-2. 7-3. 7-4. Signal and Ground Connectors for CS100 ........................................
CS100 Barometric Pressure Sensor 1. Introduction The CS100 measures barometric pressure for the range of 600 to 1100 mb. This range equates to from below sea level (as in a mine) up to 12,000 feet above sea level. Designed for use in environmental applications, the CS100 is compatible with all Campbell Scientific dataloggers. Before using the CS100, please study • • • Section 2, Cautionary Statements Section 3, Initial Inspection Section 4, Quickstart More details are available in the remaining sections.
CS100 Barometric Pressure Sensor vertically downwards to prevent condensation collecting in the pressure cavity, and also to ensure that water cannot enter the sensor. 4.2 Step 2 — Use SCWin Short Cut to Program Datalogger and Generate Wiring Diagram The simplest method for programming the datalogger to measure the CS100 is to use Campbell Scientific's SCWin Short Cut Program Generator. 2 1. Open Short Cut and click on New Program. 2. Select a datalogger and scan interval.
CS100 Barometric Pressure Sensor 3. Select CS100 Barometric Pressure Sensor then click the right arrow in the middle of the page to add the sensor to the list of sensors to be measured. 4. Define the name of the public variables. Variable defaults to BP_mmHg that holds the barometric pressure measurements. Select the desired units of measure, pressure range, sea level elevation correction, elevation correction units, and whether the sensor should be measured hourly.
CS100 Barometric Pressure Sensor WARNING 5. 5. Choose the outputs for the barometric pressure and then select finish. 6. Remove the yellow warning label from the pigtails and wire according to the wiring diagram generated by SCWin Short Cut. Improper wiring may damage the CS100 beyond repair. Overview The CS100 is a capacitive pressure transducer that uses the Setra's electrical capacitor technology for barometric pressure measurements over the 600 to 1100 millibar range.
CS100 Barometric Pressure Sensor 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).
CS100 Barometric Pressure Sensor 6. Specifications Features: • Integral switching circuit limits power consumption to measurement cycle • Compatible with all Campbell Scientific dataloggers (including the CR200(X) series) • Calibration NIST traceable • Meets CE conformance standards Compatibility Dataloggers: 6.1 CR200(X) series CR800 series CR1000 CR3000 CR5000 CR9000(X) CR7X CR510 CR10(X) CR23X 21X Performance 6.1.
CS100 Barometric Pressure Sensor 6.1.2 Performance for “500 to 1100 mb” Range Option Measurement Range: Total Accuracy 2 : Linearity: Hysteresis: Repeatability: 500 to 1100 mb ±0.6 mb @ 20°C ±1.2 mb @ 0° to +40°C ±2.0 mb @ -20° to +50°C ±2.5 mb @ -40° to +60°C ±0.5 mb ±0.06 mb ±0.04 mb 6.1.3 Performance for “800 to 1100 mb” Range Option Measurement Range: Total Accuracy 3 : Linearity: Hysteresis: Repeatability: 6.2 Electrical Supply Voltage: Current Consumption: 6.3 800 to 1100 mb ±0.
CS100 Barometric Pressure Sensor 7. Installation 7.1 Enclosure Considerations To prevent condensation, install the sensor in an environmentally protected enclosure, complete with desiccant, which should be changed at regular intervals. CAUTION 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 datalogger.
CS100 Barometric Pressure Sensor Remember that for the sensor to detect the external ambient pressure, the enclosure must vent to the atmosphere (i.e., not be hermetically sealed). Enclosures purchased from Campbell Scientific properly vent to the atmosphere. NOTE 7.2 For user-supplied enclosures, it may be necessary to make 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.
CS100 Barometric Pressure Sensor TABLE 7-1. Signal and Ground Connectors for CS100 Wire CS100 Terminal Datalogger Single-Ended Measurement Datalogger Differential Measurement Blue VOUT S.E. Input High Side of Diff Input Yellow AGND AG (CR10(X), CR500, CR510) (Other Dataloggers) Low Side of Diff.
CS100 Barometric Pressure Sensor 7.3 Programming The CS100 sensor is measured using the singled-ended voltage measurement instruction (VoltSE() in CRBasic and Instruction 1 in Edlog). Atmospheric pressure changes little with time. In most weather station applications measuring pressure once an hour is adequate. 7.3.1 Conversion Factors In the example programs, the pressure is reported in millibars (mb).
CS100 Barometric Pressure Sensor 7.3.3 Program Examples The CS100 wiring instructions for the example programs are shown in TABLE 7-4 below. TABLE 7-4. Wiring for Example Programs Wire Color Blue Red Black Yellow Green Clear Description VOUT – Pressure Signal Out SUPPLY – 12 Vdc Power In GND – Power Ground AGND – Signal Ground ETX. TRIG. – External Trigger Shield CR10(X) SE6 12V G AG C8 G CR1000 SE15 12V G C4 G 7.3.3.
CS100 Barometric Pressure Sensor EndIf 'Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg 7.3.3.2 CRBasic Example 2: CR1000 Program Using Pipeline Mode Although this example is for the CR1000, other CRBasic dataloggers, such as the CR200(X), CR800, CR850, CR3000, and CR9000(X) are programmed similarly. In the example, the CR1000 measures the CS100 once an hour in a program that runs at 1 Hz.
CS100 Barometric Pressure Sensor 7.3.3.3 Edlog Example — CR10X Program Although this example is for a CR10X, other Edlog dataloggers, such as the CR510, CR23X, CR7, and 21X are programmed similarly. In the example, the CR10X datalogger turns on the CS100 one minute before the top of the hour using a control port. On the hour, the datalogger measures the CS100, and then it turns the CS100 off.
CS100 Barometric Pressure Sensor 9: Sample (P70) 1: 1 2: 1* Reps Loc [ P_mb ] *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines End Program -Input Locations1 P_mb * Proper entries will vary with program and datalogger channel, and input location assignments. 7.3.
CS100 Barometric Pressure Sensor The value dP is in millibars and the site elevation, E, is in meters. Add dP value to the offset in the measurement instruction. Use Equation (2) to convert feet to meters. E(m) = E( ft ) 3.281ft m (2) The corrections involved can be significant: e.g. at 1000mb and 20°C, barometric pressure will decrease by 1.1mb for every 10 meter increase in altitude. 8. Maintenance and Calibration Since the sensor is semi-sealed, minimum maintenance is required: 1.
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