HC2S3 Temperature and Relative Humidity Probe Revision: 12/11 C o p y r i g h t © 1 9 9 0 - 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 .
Warranty “PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified in the corresponding 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.
Assistance Products may not be returned without prior authorization. The following contact information is for US and international customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 227-2342.
HC2S3 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 Description.....................................................1 2. Specifications ..............................................................2 2.1 Temperature Sensor ..................................................................................2 2.2 Relative Humidity Sensor.................................................
HC2S3 Table of Contents C. HC2S3 Digital Communications.............................C-1 C.1 C.2 C.3 C.4 HC2S3 Digital Interface Specifications .............................................. C-1 HC2S3 Communications Protocol ...................................................... C-1 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 3-1. HC2S3 and 41003-5 Radiation Shield on a Tripod Mast .......................
Model HC2S3 Temperature and Relative Humidity Probe 1. General Description 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. A special Rotronic cable and the SDM-SIO1 Serial I/O Module or MD485 RS-485 Interface is required to interface with the UART as described in Appendix B.
Model HC2S3 Temperature and Relative Humidity Probe The HC2S3 ships with: (1) 27731 Gill Radiation Shield Hex Plug (1) Calibration Card (1) Resource DVD 2. Specifications Operating Limits at Electronics: -40°C to +100°C Storage Temperature: -50°C to +100°C Probe Length: 85 mm (3.3 "), 121 mm (4.75”) including connector Probe Diameter: 15 mm (0.6 ") Probe Weight: 10 g (0.35 oz) Filter: Polyethylene or Teflon (optional, ordered separately) Power Consumption: <4.3 mA @ 5 V <2.
Model HC2S3 Temperature and Relative Humidity Probe Temperature Accuracy over Temperature: 2.2 Relative Humidity Sensor Sensor: ROTRONIC Hygromer® IN1 Relative Humidity Measurement Range: 0 to 100% non-condensing RH Output Signal Range: 0 to 1 VDC Accuracy at 23°C ±0.
Model HC2S3 Temperature and Relative Humidity Probe CAUTION The black outer jacket of the cable is Santoprene® rubber. This compound was chosen for its resistance to temperature extremes, moisture, and UV degradation. However, this jacket will support combustion in air. It is rated as slow burning when tested according to U.L. 94 H.B. and will pass FMVSS302. Local fire codes may preclude its use inside buildings. 2.3 Default Settings and Digital Interface Please refer to Appendices. 3. Installation 3.
Model HC2S3 Temperature and Relative Humidity Probe shield (please refer to the 43502 product manual for details). The 41003-5 Radiation Shield has a U-bolt for attaching the shield to a tripod mast/tower leg or CM200 series crossarm as shown in Figures 3-1 and 3-2. To install the probe inside the 41003-5 Radiation Shield, the hex plug provided with the 41003-5 must be replaced with the PN 27731 Hex Plug provided with the probe. Insert the probe into the radiation shield leaving about 2.
Model HC2S3 Temperature and Relative Humidity Probe CM200 Series Crossarm FIGURE 3-2. HC2S3 and 41003-5 Radiation Shield on a CM200 Series Crossarm 4. Wiring Connections to Campbell Scientific dataloggers for measuring humidity and temperature using two single-ended or two differential analog inputs are given in Tables 4-1 and 4-3. 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 measurements. For cable lengths longer than 6.
Model HC2S3 Temperature and Relative Humidity Probe TABLE 4-1.
Model HC2S3 Temperature and Relative Humidity Probe 5. Example Programs This section is for users who write their own datalogger programs. A datalogger program to measure this sensor and wiring diagram can be created using Campbell Scientific’s Short Cut Program Programming Wizard. Short Cut supports most CSI dataloggers (CR7, 21X, CR10, CR500, CR510, CR23X, CR3000, CR5000). You do not need to read this section to use Short Cut.
Model HC2S3 Temperature and Relative Humidity Probe TABLE 5-3.
Model HC2S3 Temperature and Relative Humidity Probe CR10(X) program using single-ended measurement instructions ;{CR10X} program to measure HC2S3 with single-ended inputs *Table 1 Program 01: 5.0000 Execution Interval (seconds) 1: Do (P86) 1: 41 Set Port 1 High ;Turn on switched 12V ;Jumper from C1 to SW 12V CTRL 2: Excitation with Delay (P22) ;3-second delay 1: 1 Ex Channel 2: 0 Delay W/Ex (0.01 sec units) 3: 300 Delay After Ex (0.
Model HC2S3 Temperature and Relative Humidity Probe 10: End (P95) 11: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 12: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 101 Array ID 13: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 14: Average (P71) 1: 1 Reps 2: 2 Loc [ AirTC ] 15: Sample (P70) 1: 1 2: 1 Reps Loc [ RH ] CR1000 program using single-ended measurements in Slow Sequence scan The following
Model HC2S3 Temperature and Relative Humidity Probe BeginProg Scan (1,Sec,1,0) 'Run main scan 1 second Battery (Battery_volts) PanelTemp (Ptemp_C,250) 'add additional instructions to be executed every 1 second CallTable (Table1) NextScan SlowSequence Scan (5,Sec,0,0) PortSet (9,TRUE) Delay (0,3000,mSec) VoltSe (AirTC,1,mV2500,2,0,0,_60Hz,0.1,-40) VoltSe (RH,1,mV2500,1,0,0,_60Hz,0.
Model HC2S3 Temperature and Relative Humidity Probe CR1000 program using differential measurements 'CR1000 program to measure HC2S3 with differential measurements 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.
Model HC2S3 Temperature and Relative Humidity Probe 4: If (X<=>F) (P89) 1: 4 X Loc [ RH ] 2: 4 < 3: 103 F 4: 30 Then Do 5: Z=F x 10^n (P30) 1: 100 F 2: 0 n, Exponent of 10 3: 4 Z Loc [ RH ] 6: End (P95) 7: End (P95) 8: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 9: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 101 Array ID 10: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 11: Average (P71) 1: 1 Reps
Model HC2S3 Temperature and Relative Humidity Probe voltage drop (Vd), along the signal reference/power ground, is given by Eq. (1). Vd = I ∗R = 2 mA ∗ 7.37 Ω 304.8 m (1000 ' ) (1) = 14.7 mV 304.8 m (1000 ' ) This voltage drop will raise the apparent temperature and relative humidity because the difference between the signal and signal reference lead, at the datalogger, has increased by Vd. The approximate error in temperature and relative humidity is 0.15°C and 0.15% per 30.
Model HC2S3 Temperature and Relative Humidity Probe 3. Verify the green power wire is connected to the 12V, SW12V, or 5V terminal. When SW12V is used with a CR10X datalogger, verify the SW 12V CTRL is jumpered to the Control Port specified in the program. Cables longer than 3 m (10') should be powered by the 12V, rather than the 5V terminal. A voltmeter can be used to check the output voltage for temperature and relative humidity on the brown and white wires respectively (temperature °C = mV * 0.1 – 40.
Appendix A. Absolute Humidity The HC2S3 measures the relative humidity. Relative humidity is defined by the equation below: RH = e ∗ 100 es (A-1) where RH is the relative humidity, e is the vapor pressure in kPa , and es 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. The saturation vapor pressure is the maximum amount of water vapor that air can hold at a given air temperature.
Appendix A.
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.
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. IMPORTANT Prior to using the AC3001 cable, the ROTRONIC USB driver must be installed on the PC.
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.
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 2: 5 3: 2 4: 1 5: 0.09 6: -60.
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).
Appendix C. HC2S3 Digital Communications Command Format: { ID Adr RDD Chksum or } CR Adr RDD Chksum or } CR Answer format: { ID 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 Relative humidity or analog value %RH String Humidity or analog value engineering unit 0..
Appendix C. HC2S3 Digital Communications C.3 RS-485 Communications using an MD485 RS-485 Interface The HC2S3 can be interfaced to a CSI 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.
Appendix C. HC2S3 Digital Communications Sensor Wiring: E2-05XX-MOD Cable MD485 Blue A Red B Green Gray/Yellow Clear NOTE CR1000 12V G Ground Symbol 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. Connect the CS I/O port of MD485 to CS I/O port on CR1000 with an SC12 cable.
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.
Appendix C.
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) PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA www.campbellsci.com.au • info@campbellsci.com.au Campbell Scientific do Brazil Ltda.
