Campbell HC2S3 Instruction Manual
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Campbell HC2S3 Instruction Manual

Temperature and relative humidity probe
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HC2S3 Temperature
and Relative Humidity Probe
Revision: 10/12
C o p y r i g h t
©
1 9 9 0 - 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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Summary of Contents for Campbell HC2S3

  • Page 1 HC2S3 Temperature and Relative Humidity Probe Revision: 10/12 C o p y r i g h t © 1 9 9 0 - 2 0 1 2 C a m p b e l l S c i e n t i f i c ,...
  • Page 3 Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty.
  • Page 4 SCIENTIFIC, INC., phone (435) 227-9000. 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.

  • Page 5: Table Of Contents

    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 Ships With....................2 4. Quickstart ..............2 Step 1 —...
  • Page 6 RS-485 Communications using an MD485 RS-485 Interface..C-3 RS-485 Communications using an SDM-SIO1 Serial I/O Module . C-5 Figures 4-1. HC2S3 and 41003-5 Radiation Shield on a tripod mast ...... 3 4-2. HC2S3 and 41003-5 Radiation Shield on a CM200 Series Crossarm. 3 Tables 5-1.

  • Page 7: Introduction

    Refer to the Ships With list to ensure that parts are included (see Section 3.1). The HC2S3 probe and its calibration card are shipped in a small box, with the box and PN 27731 Hex Plug attached to the cable.

  • Page 8: Ships With

    • 27731 Hex Plug (ships with HC2S3) 1. Insert the 27731 hex plug that ships with the HC2S3 probe into the underside of the 41003-5 base. 2. Attach the radiation shield to the tripod mast, crossarm, or tower leg using the supplied U-bolt.

  • Page 9: Hc2S3 And 41003-5 Radiation Shield On A Tripod Mast

    Model HC2S3 Temperature and Relative Humidity Probe 41003-5 PN 27731 Hex Plug U-bolt FIGURE 4-1. HC2S3 and 41003-5 Radiation Shield on a tripod mast CM200 Series Crossarm FIGURE 4-2. HC2S3 and 41003-5 Radiation Shield on a CM200 Series Crossarm...

  • Page 10: Step 2 - Use Scwin Short Cut To Program Datalogger And Generate Wiring Diagram

    Step 2 — Use SCWin Short Cut to Program Datalogger and Generate Wiring Diagram The simplest method for programming the datalogger to measure the HC2S3 is to use Campbell Scientific's SCWin Short Cut Program Generator. 1. Open Short Cut and click on New Program.
  • Page 11 Model HC2S3 Temperature and Relative Humidity Probe 3. Select HC2S3 Temperature and Relative Humidity Sensor and choose either constant power or panel switched power (uses less current), then click the right arrow to add it to the list of sensors to be measured.
  • Page 12 Model HC2S3 Temperature and Relative Humidity Probe 5. Choose the outputs for the AirTC and RH and then select finish. 6. Wire according to the wiring diagram generated by SCWin Short Cut.

  • Page 13: Overview

    Model HC2S3 Temperature and Relative Humidity Probe Overview The HC2S3 is a digital probe with 0 to 1 V linear output signals for temperature and humidity, and a UART serial interface. The voltage signals can be measured with two single-ended or two differential inputs on the datalogger.

  • Page 14: Specifications

    RAWS-P Permanent Remote Automated Weather Station (cable termination option –RQ). The HC2S3-QD is included with the RAWS-F Quick Deployment Remote Automated Weather Station and can be ordered as a replacement part. Its cable has a 65-in. length and terminates in a military-style connector that attaches to the Temp/RH connector on the RAWS-F connector panel.

  • Page 15: Temperature Sensor

    Model HC2S3 Temperature and Relative Humidity Probe Power Consumption: <4.3 mA @ 5 V <2.0 mA @ 12 V Supply Voltage (using CSI cable): 5 to 24 Vdc (12 Vdc recommended) Start-up time: 1.5 s typical (Rotronic specification, Campbell Scientific recommends 2 s at 60°C, 3 s at 0°C, 4 s at -40°C)

  • Page 16: Relative Humidity Sensor

    Model HC2S3 Temperature and Relative Humidity Probe Relative Humidity Sensor ® Sensor: ROTRONIC Hygromer Relative Humidity Measurement Range: 0 to 100% non-condensing RH Output Signal Range: 0 to 1 Vdc ±0.8% RH with standard configuration Accuracy at 23°C: settings Typical Long Term Stability: <1% RH per year...

  • Page 17: Installation

    • small pair of diagonal-cutting pliers The HC2S3 probe and its calibration card are shipped in a small box, with the box and PN 27731 Hex Plug attached to the cable. PN 27731 is used to mount the probe inside the 41003-5 Radiation Shield as described in Section 4, Quickstart.

  • Page 18: Connections For Single-Ended Measurements

    Model HC2S3 Temperature and Relative Humidity Probe The HC2S3 draws approximately 2 mA powered from 12V. The HC2S3 can be continuously powered from the 12V terminal, or power can be switched with the SW12V terminal to conserve battery life. When power is switched, a three-second warm-up time is required.

  • Page 19: Programming

    Refer to the Wireless Sensor Manual for programming information if using the probe with a CWS900. The temperature and relative humidity signals from the HC2S3 are measured using either single-ended voltage instructions (VoltSE() in CRBasic or Instruction 1 in Edlog) or differential voltage instructions (VoltDiff() in CRBasic or Instruction 2 in Edlog).

  • Page 20: Example Programs Using Single-Ended Measurement Instructions

    Model HC2S3 Temperature and Relative Humidity Probe The HC2S3 output scale is 0 to 1000 mV for the temperature range of -40° to +60°C and 0 to 1000 mV for the relative humidity range of 0 to 100%. Multipliers and Offsets for the measurement instructions to convert the measurement result (mV) to temperature and relative humidity are shown in TABLE 7-3 and TABLE 7-4.
  • Page 21 Average(1,AirTC,FP2,False) Sample(1,RH,FP2) EndTable BeginProg Scan(5,Sec,1,0) PortSet(9,1) 'Turn on switched 12V Delay(0,3,Sec) '3-second delay 'HC2S3 Temperature & Relative Humidity Sensor measurements AirTC and RH: VoltSE(RH,1,mV2500,1,0,0,_60Hz,0.1,0) VoltSe(AirTC,1,mV2500,2,0,0,_60Hz,0.1,-40) PortSet(9,0) 'Turn off switched 12V If RH>100 AND RH<103 Then RH=100 CallTable(Table1) NextScan EndProg CR10(X) program using single-ended measurement instructions ;{CR10X} program to measure HC2S3 with single-ended inputs...
  • Page 22 Model HC2S3 Temperature and Relative Humidity Probe 4: Volt (SE) (P1) 1: 1 Reps 2: 25 2500 mV 60 Hz Rejection Range 3: 4 SE Channel 4: 1 Loc [ RH ] 5: 0.1 Multiplier 6: 0 Offset 5: Do (P86) ;Turn off switched 12V...

  • Page 23: Example Programs Using Differential Measurement Instructions

    The following program example has a 1-second main scan, and uses a Slow Sequence scan to measure the HC2S3 every 5 seconds. Every 5 seconds the program switches power to the HC2S3 on the SW-12 terminal, delays for a 3-second “warm-up”, and measures relative humidity and temperature on single-ended channels 1 and 2 respectively.

  • Page 24: Wiring For Differential Measurement Examples

    Public AirTC Public RH DataTable(Temp_RH,True,-1) DataInterval(0,60,Min,0) Average(1,AirTC,IEEE4,0) Sample(1,RH,IEEE4) EndTable BeginProg Scan(1,Sec,1,0) 'HC2S3 Temperature & Relative Humidity Sensor measurements AirTC and RH: VoltDiff (AirTC,1,mV2500,1,True,0,_60Hz,0.1,-40) VoltDiff (RH,1,mV2500,2,True,0,_60Hz,0.1,0) If RH>100 And RH<103 Then RH=100 CallTable(Temp_RH) NextScan EndProg CR10(X) program using differential measurement instructions ;{CR10X} *Table 1 Program 01: 1.0000...

  • Page 25: Measuring Probes With Long Cables

    2: 4 Loc [ RH ] Measuring Probes with Long Cables For cable lengths longer than 6.1 m (20 ft), Campbell Scientific recommends measuring the voltage signals using differential inputs as discussed below. Connections for differential inputs are given in TABLE 7-2.

  • Page 26: Sensor Maintenance

    The HC2S3 draws approximately 2 mA when powered with 12 V. The wire used in the HC2S3 (P/N 27746) has resistance of 14.74 Ω/304.8 m (1000 ft). Since the signal reference and the power ground are both connected to ground at the datalogger, the effective resistance of those wires together is half of 14.74 Ω/304.8 m (1000 ft), or 7.37 Ω/304.8 m (1000 ft).

  • Page 27: Troubleshooting

    Model HC2S3 Temperature and Relative Humidity Probe Troubleshooting Symptom: -9999, NAN, -40°C, or 0 % relative humidity Check that the sensor is wired to the correct analog input channels as specified by the measurement instructions. Verify the voltage range code for the single-ended or differential measurement instruction is correct for the datalogger type.
  • Page 28 Model HC2S3 Temperature and Relative Humidity Probe Lowe, P. R., 1977: An approximating polynomial for the computation of saturation vapor pressure, J. Appl. Meteor., 16, 100-103. Meyer, S. J. and K. G. Hubbard, 1992: Nonfederal Automated Weather Stations and Networks in the United States and Canada: A Preliminary Survey, Bulletin Am.

  • Page 29: A-1. Wiring For Vapor Pressure Examples

    Appendix A. Absolute Humidity The HC2S3 measures the relative humidity. Relative humidity is defined by the equation below: ∗ (A-1) where RH is the relative humidity, e is the vapor pressure in kPa , and e is the saturation vapor pressure in kPa. The vapor pressure, e, is an absolute measure of the amount of water vapor in the air and is related to the dew point temperature.

  • Page 30: Measurement Below 0°C

    EndProg A.1 Measurement Below 0°C The HC2S3 provides a humidity reading that is referenced to the saturated water vapor pressure above liquid water, even at temperatures below 0°C, where ice might form. This is the common way to express relative humidity and is as defined by the World Meteorological Organization.

  • Page 31: Changing The Hc2S3 Settings

    Appendix B. Changing the HC2S3 Settings B.1 HC2S3 Default Settings The HC2S3 probe has the following default settings, which can be changed as described in the following sections. Additional information can be found in Rotronic’s User Manual: E-M-HC2 Probes-VXXXX, which can be downloaded from Rotronic's website www.rotronic-usa.com.

  • Page 32: Software And Hardware Requirements

    Appendix B. Changing the HC2S3 Settings B.2 Software and Hardware Requirements For temperature (Analog Output 2), the HC2S3 default range is -40 to +60°C for 0 to 1V. Changing the range requires Rotronic HW4 Software (Version 2.1.0 or higher), and the Rotronic model AC3001 USB adapter cable. Power to the probe is provided by the USB port.

  • Page 33: Multiplier And Offsets For Temperature Range

    Appendix B. Changing the HC2S3 Settings Click on “Device Manager”, select “Analog Outputs” to see the following screen: Change the lower and upper range values and click “OK”. The following screen shows the range -60 to +30: B.4 Multiplier and Offsets for Temperature Range Analog Output 2 is 0 to 1V (1000 mV) for the temperature range.
  • Page 34 Appendix B. Changing the HC2S3 Settings Example measurement instructions for CR1000 datalogger, with the sensor wired to SE channel 2: Public AirTC VoltSe (AirTC,1,mV2500,2,0,0,_60Hz,0.09,-60) Example measurement instruction for CR10X datalogger: 1: Volt (SE) (P1) 1: 1 Reps 2: 5 2500 mV Slow Range...

  • Page 35: Hc2S3 Digital Communications

    Appendix C. HC2S3 Digital Communications C.1 HC2S3 Digital Interface Specifications The HC2S3 has a UART (Universal Asynchronous Receiver Transmitter) that provides two-way digital communications with the probe. Interface cables can be ordered through Rotronics for connecting the probe to an RS-485 port (Rotronic pn E2-05XX-MOD), a computer's RS-232 port (Rotronic pn AC3002), or USB port (Rotronic pn AC3001).
  • Page 36 Appendix C. HC2S3 Digital Communications Command Format: Chksum or } Answer format: Chksum or } The data are returned according to the following structure: Example Type Description 1..3 Byte Probe type (1= digital probe, 2=analog probe, 3=pressure probe) 1234.56 Float...

  • Page 37: Rs-485 Communications Using An Md485 Rs-485 Interface

    Interface using the Rotronic E2-05XX-MOD RS485 cable as described below. Settings for the RS485 port on the MD485 must be configured to match the configuration of the HC2S3, which are 19200 baud, No Parity, 8 Data Bits, 1 Stop bit, and No Flow Control.
  • Page 38 Appendix C. HC2S3 Digital Communications Sensor Wiring: E2-05XX-MOD Cable MD485 CR1000 Blue Green Gray/Yellow Clear Ground Symbol NOTE If the Rotronic cable includes brown and white wires (voltage signals for temperature and humidity), CSI recommends “capping” them with PN 27749 or equivalent insulated caps to prevent the possibility of shorting.

  • Page 39: Rs-485 Communications Using An Sdm-Sio1 Serial I/O Module

    Appendix C. HC2S3 Digital Communications C.4 RS-485 Communications using an SDM-SIO1 Serial I/O Module The HC2S3 can be interfaced to a CSI datalogger through an SDM-SIO1 Serial I/O Module using the Rotronic E2-05XX-MOD RS485 cable as described below. The example program uses the SerialOpen instruction to configure the SDM- SIO1 for RS-485 half duplex, “COMport 32”...
  • Page 40 Appendix C. HC2S3 Digital Communications Example CR1000 Program: 'CR1000 Program 'Declare variables Public SerialIndest As String * 100 Dim String_1 As String Const CRLF=CHR(13)+CHR(10) Dim HC2S3_Split(17) As String * 40 Alias HC2S3_Split(2) = RH_Str 'RH string. Alias HC2S3_Split(6) = TempC_Str 'Temp string.
  • Page 42 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)

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