Campbell HC2S3 Product Manual
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Campbell HC2S3 Product Manual

Temperature and relative humidity probe
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HC2S3
Temperature and
Relative Humidity Probe
Revision: 7/18
Copyright © 1990 – 2018
Campbell Scientific, Inc.

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Summary of Contents for Campbell HC2S3

  • Page 1 HC2S3 Temperature and Relative Humidity Probe Revision: 7/18 Copyright © 1990 – 2018 Campbell Scientific, Inc.
  • Page 3 Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
  • Page 4 Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA) number, contact CAMPBELL SCIENTIFIC, INC., phone (435) 227-9000. Please write the issued RMA number clearly on the outside of the shipping container. Campbell Scientific’s shipping address is: CAMPBELL SCIENTIFIC, INC.
  • Page 5 Periodically (at least yearly) check electrical ground connections. • WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

  • Page 7: 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. Precautions ..............1 3. Initial Inspection ............1 Ships With ....................
  • Page 8 HC2S3 and 41003-5 Radiation Shield on a CM200 Series Crossarm (left) and on a tripod mast (right) ........12 7-2. HC2S3 and RAD10 Radiation Shield on a tripod mast ..... 12 Tables 7-1. Wire Color, Function, and Datalogger Connection for Single-Ended Measurement .............

  • Page 9: Introduction

    Model HC2S3 Temperature and Relative Humidity Probe Introduction The HC2S3 is a rugged, accurate temperature and relative humidity probe that is ideal for long-term, unattended applications. The probe uses Rotronic’s IN1 capacitive sensor to measure relative humidity and a 100 Ω PRT to measure temperature.

  • Page 10: Ships With

    Refer to Section 3.1, Ships With , to ensure that parts are included. The (p. 2) HC2S3 probe and its calibration card are shipped in a small box, with the box and pn 27731 Hex Plug attached to the cable. Ships With...
  • Page 11 Click Next. Under the Available Sensors and Devices list, select the Sensors | Meteorological | Relative Humidity & Temperature | HC2S3 Temperature and Relative Humidity Sensor folder. Choose either constant power or panel-switched power (uses less current). Click move the selection to the Selected device window.

  • Page 12: Overview

    Overview The HC2S3 is a digital probe with linear voltage outputs for temperature and humidity and a UART serial interface. Its voltage signals can be measured with two single-ended or two differential inputs on the datalogger. Interfacing with the UART is described in Appendix E, HC2S3 Digital Communications (p.

  • Page 13: Specifications

    Model HC2S3 Temperature and Relative Humidity Probe ground, which can affect the accuracy of low-level single-ended voltage measurements. Probes are polarity-protected by a keyed connector and diode in the connector interface provided with the Campbell Scientific cable. Campbell Scientific offers two filters: Polyethylene filter: Default filter, protection against fine dust particles, no water absorption or retention, good response time.

  • Page 14: Temperature Measurement

    Model HC2S3 Temperature and Relative Humidity Probe Temperature Measurement Sensor: PT100 RTD, IEC 751 1/3 Class B, with calibrated signal conditioning Measurement Range: –50 to 100 °C (default –40 to 60 °C) Output Signal Range: 0 to 1.0 V Accuracy at 23 °C: ±0.1 °C with standard configuration...

  • Page 15: Installation

    , for a Short (p. 2) Cut tutorial. Wiring to Datalogger Connections to Campbell Scientific dataloggers for measuring humidity and temperature using two single-ended or two differential analog inputs are given in TABLE and TABLE 7-2. Use a single-ended analog measurement when the cable length is less than 6.1 m (20 ft), or if power is switched off between...

  • Page 16: Wire Color, Function, And Datalogger Connection For Single-Ended Measurement

    Model HC2S3 Temperature and Relative Humidity Probe TABLE 7-1. Wire Color, Function, and Datalogger Connection for Single-Ended Measurement Wire Color Wire Function Datalogger Connection Terminal Temperature U configured for single-ended analog input Brown signal SE (single-ended, analog-voltage input) U configured for single-ended analog input,...

  • Page 17: Datalogger Programming

    (CR200(X)-, CR6-, and CR800-series, CR1000, CR3000) to measure both temperature and relative humidity from the HC2S3 sensor. The 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%.

  • Page 18: Voltdiff() Instruction

    (p. 15) discuss temperature and relative humidity sensors. When used in the field, the HC2S3 must be housed in a radiation shield such as the 41003-5 or RAD10 naturally aspirated shields, or the 43502 motor- aspirated shield (please refer to the 43502 product manual for installation details).

  • Page 19: Installation In A 41003-5 10-Plate Shield

    Loosely thread the collar adapter into the base of the 10-plate shield. Insert the HC2S3 sensor into the collar. Leave about 2.5 cm (1 in) of the sensor exposed below the collar. See FIGURE 7-1. Hold the collar and sensor, and finish threading the collar into the shield by hand.

  • Page 20: Operation

    Model HC2S3 Temperature and Relative Humidity Probe FIGURE 7-1. HC2S3 and 41003-5 Radiation Shield on a CM200 Series Crossarm (left) and on a tripod mast (right) FIGURE 7-2. HC2S3 and RAD10 Radiation Shield on a tripod mast Operation Measurement The probe uses a Rotronic IN1 capacitive sensor to measure RH and a 100 Ω...

  • Page 21: Low Power Operation

    The HC2S3 draws approximately 2 mA when powered with 12 V. The wire used in the HC2S3 (pn 27746) has resistance of 14.74 Ω/304.8 m (1000 ft). Because 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 22: Troubleshooting

    Maintenance The HC2S3 probe requires minimal maintenance, but dust, debris, and salts on the filter cap will degrade sensor performance. Check the white filter on the end of the sensor for debris. If dirt or salt is engrained into the filter, it should be cleaned with distilled water or replaced.

  • Page 23: Attributions And References

    Refer to for more www.campbellsci.com/hc2a-s3 information. The sensor should be calibrated annually. Please obtain an RMA number before returning the HC2S3 to Campbell Scientific for calibration. Please refer Warranty Assistance sections at the beginning of the manual. 10. Attributions and References Santoprene is a registered trademark of Exxon Mobile Corporation.

  • Page 25: Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: Importing a Short Cut program into a program editor for additional • refinement Importing a wiring diagram from Short Cut into the comments of a • custom program Short Cut creates files, which can be imported into CRBasic Editor.

  • Page 27: Example Programs

    CR3000, and CR5000 dataloggers. CRBasic Example B-1. Program Measuring the HC2S3 with Single-Ended Inputs 'Program measures HC2S3 with single-ended inputs once every 5 seconds and stores 'the average temperature and a sample of the relative humidity every 60 minutes. 'Wiring Diagram...

  • Page 28: Example Program Using Differential Measurement Instructions

    CRBasic Example B-2. Program Measuring the HC2S3 with Differential Inputs 'CR1000 program to measure HC2S3 with differential measurements 'Program measures HC2S3 with differential inputs once every second and stores the 'average temperature and a sample of the relative humidity every 60 minutes.

  • Page 29: Absolute Humidity

    Appendix C. Absolute Humidity The HC2S3 measures relative humidity. Relative humidity is defined by the equation below: ∗ (A-1) where RH is relative humidity, e is vapor pressure in kPa , and e is saturation vapor pressure in kPa. 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 C.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 D. Changing the HC2S3 Settings D.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 D. Changing the HC2S3 Settings D.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 D. 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: D.4 Multiplier and Offsets for Temperature Range Analog Output 2 is 0 to 1V (1000 mV) for the temperature range.
  • Page 34 Appendix D. 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)

  • Page 35: Hc2S3 Digital Communications

    Appendix E. HC2S3 Digital Communications E.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...
  • Page 36 Appendix E. 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

    E.3 RS-485 Communications using an MD485 RS-485 Interface The HC2S3 can be interfaced to a Campbell Scientific datalogger through an MD485 RS-485 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 COMSDC7 using the SerialOpen instruction, sends the RDD (Read Values) command “|{F00RDD}CR” to the probe, and parses temperature and relative humidity values from the data string returned by the probe. CRBasic Example E-1. Program Measuring the HC2S3 Using RS-485 'CR1000 Program 'Declare variables...

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

    Appendix E. HC2S3 Digital Communications E.4 RS-485 Communications using an SDM-SIO1 Serial I/O Module The HC2S3 can be interfaced to a Campbell Scientific 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 E. HC2S3 Digital Communications CRBasic Example E-2. Program Measuring the HC2S3 Using the SDM-SIO1 'CR1000 Program 'Declare variables Public SerialIndest As String * 100 String_1 As String Const CRLF=CHR(13)+CHR(10) HC2S3_Split(17) As String * 40 Alias HC2S3_Split(2) = RH_Str 'RH string.
  • Page 42 Campbell Scientific Worldwide Offices Australia Germany Location: Garbutt, QLD Australia Location: Bremen, Germany Email: Email: info@campbellsci.com.au info@campbellsci.de Website: www.campbellsci.com.au Website: www.campbellsci.de Brazil South Africa Location: São Paulo, SP Brazil Location: Stellenbosch, South Africa Email: andread@campbellsci.com.br Email: sales@csafrica.co.za Website: Website: www.campbellsci.com.br www.campbellscientific.co.za...

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