CS106 Barometric Pressure Sensor Revision: 11/11 C o p y r i g h t © 1 9 9 5 - 2 0 1 1 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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CS106 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. General .........................................................................1 2. Specifications ..............................................................1 3. Installation and Wiring ................................................2 3.1 3.2 3.3 3.4 Jumper Settings..................................................................
CS106 Barometric Pressure Sensor 1. General The CS106 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 CS106 outputs a linear 0 to 2.5 VDC signal that corresponds to 500 to 1100 mb. It can be operated in a shutdown or normal mode. In the shutdown mode the datalogger switches 12 VDC power to the barometer during the measurement.
CS106 Barometric Pressure Sensor Supply Voltage Control: When enabled with an internal jumper, the CS106 is on continually. When disabled, the CS106 can be turned on/off with 5 VDC/0 VDC. Supply Voltage Sensitivity: negligible 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® rubber.
CS106 Barometric Pressure Sensor Jumper FIGURE 3-1. CS106 Jumper Set to Shutdown Mode 3.2 Datalogger Connection Before connecting the barometer to the datalogger, a yellow warning label must be removed from the pigtails. The warning label reminds the user of the importance of properly connecting the barometer to the datalogger. Wiring is shown in Figure 3-2 and Table 3-1.
CS106 Barometric Pressure Sensor See Table 3-1 Blue – Pressure (VOUT) See Table 3-1 Yellow – Signal Ground (AGND) Continuous 12 VDC Red – 12 VDC (SUPPLY) See Table 3-1 Black – Power Ground (GND) Control Port or Excitation Channel Green – Control (EXT. TRIG) Ground or Analog Ground Clear – Shield (G or AGND) FIGURE 3-2. CS106 Wiring Diagram TABLE 3-1. Signal and Ground Connectors for CS106 Wire CS106 Terminal Datalogger Single-Ended Measurement Datalogger Differential Measurement Blue VOUT S.E.
CS106 Barometric Pressure Sensor WARNING Improper wiring may damage the CS106 beyond repair. 3.3 5-pin Screw Terminal Plug Connector The datalogger connects to the CS106 via a 5-pin screw terminal plug connector. This connector is removable and may be replaced. The replacement connector may come with a connector key attached to it to ensure that the connector is plugged into the CS106 right side up (see Figure 3-3). When the connector is right side up, it will easily plug into the barometer. FIGURE 3-3.
CS106 Barometric Pressure Sensor FIGURE 3-4. ENC100 is a very small enclosure that can house one CS106. 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 For user-supplied enclosures, it may be necessary to make a vent hole on the outer wall.
CS106 Barometric Pressure Sensor 4. Programming The CS106 sensor is measured using the singled-ended voltage measurement instruction (VoltSe in CRBasic or P1 in Edlog). Atmospheric pressure changes little with time. In most weather station applications measuring pressure once an hour is adequate. Program Example 1 is for the dataloggers that use the CRBasic language, such as CR200(X), CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X).
CS106 Barometric Pressure Sensor 4.2 Program Examples 4.2.1 Example 1 – Sample Program for CR1000 (CRBasic) Datalogger 'CR1000 Datalogger Public CS106_temp, pressure Units pressure = mbar DataTable (met_data,True,-1) DataInterval (0,60,min,10) Sample (1,pressure,IEEE4) EndTable BeginProg PipeLineMode Scan (1,sec,3,0) 'Measurement is made every scan outside the "If" statement VoltSe (CS106_temp,1,mV2500,1,False,0,_60Hz,0.
CS106 Barometric Pressure Sensor ;Measure CS106 at the top of the hour ; 2: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 30 Then Do 3: Volt (SE) (P1) 1: 1 2: 25 3: 1 4: 1 5: 0.
CS106 Barometric Pressure Sensor 4.3 Long Lead Lengths There is a 0.06 mV/foot voltage drop in the CS106 signal leads. This voltage drop, in long lead lengths, will raise the barometric reading by approximately 1.44 mb per 100 feet. For lead lengths greater than 20 feet, use the differential instruction (Instruction 2) to measure the CS106. 4.
CS106 Barometric Pressure Sensor The corrections involved can be significant: e.g. at 1000 mb and 20°C, barometric pressure will decrease by 1.1 mb for every 10 meter increase in altitude. 6. Maintenance and Calibration Since the sensor is semi-sealed, minimum maintenance is required: 1. Visually inspect the cable connection to ensure it is clean and dry. 2. Visually inspect the casing for damage. 3. Ensure that the pneumatic connection and pipe are secure and undamaged.
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