Campbell Scientific HC2S3 User Manual
HC2S3 Temperature
and Relative Humidity Probe
Revision: 10/12
Copyright © 1990-2012
Campbell Scientific, Inc.
Warranty
“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
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limited to repairing or replacing (at Campbell's option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
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locations, Campbell will return such products best way CIP (Port of Entry)
INCOTERM® 2010, prepaid. This warranty shall not apply to any products
which have been subjected to modification, misuse, neglect, improper service,
accidents of nature, or shipping damage. This warranty is in lieu of all other
warranties, expressed or implied. The warranty for installation services
performed by Campbell such as programming to customer specifications,
electrical connections to products manufactured by Campbell, and product
specific training, is part of Campbell’s product warranty. CAMPBELL
EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,
incidental, and/or consequential damages.”
Assistance
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served by Campbell Scientific, Inc. directly. Affiliate companies handle
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www.campbellsci.com to determine which Campbell Scientific company serves
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SCIENTIFIC, INC., phone (435) 227-9000. After an applications engineer
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CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
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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
3.1 Ships With............................................................................................2
4. Quickstart .................................................................... 2
4.1 Step 1 — Mount the Probe...................................................................2
4.2 Step 2 — Use SCWin Short Cut to Program Datalogger and
Generate Wiring Diagram.................................................................4
5. Overview......................................................................7
6. Specifications .............................................................8
6.1 Temperature Sensor .............................................................................9
6.2 Relative Humidity Sensor ..................................................................10
6.3 Default Settings and Digital Interface................................................10
7. Installation.................................................................11
7.1 Siting ..................................................................................................11
7.2 Assembly and Mounting ....................................................................11
7.3 Wiring ................................................................................................11
7.4 Programming......................................................................................13
7.4.1 Example Programs using Single-Ended Measurement
Instructions ..............................................................................14
7.4.2 Example Programs using Differential Measurement
Instructions ..............................................................................17
7.5 Measuring Probes with Long Cables..................................................19
8. Sensor Maintenance.................................................20
9. Troubleshooting........................................................21
10. References ................................................................21
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Table of Contents
Appendices
Absolute Humidity ..................................................A-1
A.
A.1 Measurement Below 0°C................................................................. A-2
B. Changing the HC2S3 Settings ...............................B-1
B.1 HC2S3 Default Settings .................................................................. B-1
B.2 Software and Hardware Requirements ............................................ B-2
B.3 Changing the Temperature Range ................................................... B-2
B.4 Multiplier and Offsets for Temperature Range................................ B-3
C. HC2S3 Digital Communications ............................C-1
C.1 HC2S3 Digital Interface Specifications........................................... C-1
C.2 HC2S3 Communications Protocol................................................... C-1
C.3 RS-485 Communications using an MD485 RS-485 Interface......... C-3
C.4 RS-485 Communications using an SDM-SIO1 Serial I/O Module . C-5
Figures
Tables
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
5-1. Recommended Lead Lengths .............................................................. 7
7-1. Connections for Single-Ended Measurements................................... 12
7-2. Connections for Differential Measurements...................................... 13
7-3. Temperature....................................................................................... 14
7-4. Humidity............................................................................................ 14
7-5. Wiring for Single-ended Measurement Examples............................. 14
7-6. Wiring for Differential Measurement Examples ............................... 18
A-1. Wiring for Vapor Pressure Examples .............................................. A-1
ii
Model HC2S3 Temperature and Relative
Humidity Probe
1. Introduction
The HC2S3 is a rugged, accurate temperature/RH probe that is ideal for longterm, unattended applications. The probe uses a Rotronic’s IN1 capacitive
sensor to measure RH and a 100 ohm PRT to measure temperature. For
optimum results, the HC2S3 should be recalibrated annually.
Before using the HC2S3, please study
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
• Section 4, Quickstart
More details are available in the remaining sections.
2. Cautionary Statements
• Care should be taken when opening the shipping package to not damage or
cut the cable jacket. If damage to the cable is suspected, consult with a
Campbell Scientific applications engineer.
• Although the HC2S3 is rugged, it should be handled as a precision
scientific instrument.
• Do not touch the sensor element.
• 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.
3. Initial Inspection
• Upon receipt of the HC2S3, inspect the packaging and contents for
damage. File damage claims with the shipping company.
• The model number and cable length are printed on a label at the
connection end of the cable. Check this information against the shipping
documents to ensure the correct product and cable length are received.
• 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.
1
Model HC2S3 Temperature and Relative Humidity Probe
3.1 Ships With
The HC2S3 ships with:
(1) 27731 Gill Radiation Shield Hex Plug
(1) Calibration Card
(1) Resource DVD
4. Quickstart
4.1 Step 1 — Mount the Probe
Review Section 7, Installation for complete instructions. To install the HC2S3,
you will need:
• 41003-5 Radiation Shield
• 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. See FIGURE 4-1 and FIGURE 4-2 for examples of
shield mounting.
3. Insert the probe into the radiation shield leaving about 2.5 cm (1 in.)
exposed below the hex plug.
4. Tighten the hex plug such that it compresses against the body of the
HC2S3 to hold it inside the radiation shield.
5. Attach the probe to the cable by aligning the keyed connectors, pushing
the connectors together and tightening the knurled ring.
6. Route the cable to the datalogger, and secure the cable to the mounting
structure using cable ties.
2
U-bolt
Model HC2S3 Temperature and Relative Humidity Probe
41003-5
PN 27731 Hex Plug
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
3
Model HC2S3 Temperature and Relative Humidity Probe
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 HC2S3 is
to use Campbell Scientific's SCWin Short Cut Program Generator.
1. Open Short Cut and click on New Program.
2. Select a datalogger and scan interval.
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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.
4. Define the name of the public variables. Variables default to AirTC and
RH that hold the air temperature and relative humidity measurements.
Select the desired units of measure. Units default to Deg C.
5
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.
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5. Overview
Model HC2S3 Temperature and Relative Humidity Probe
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.
The D/A converter used to generate the analog output signals has 16-bit
resolution. The default configuration is for temperature -40° to +60°C, and
0 - 100% relative humidity. Temperature range and other default settings can
be changed as described in Appendix A.
A cable ordered through Campbell Scientific for the HC2S3 includes an
internal voltage regulator that applies 3.3 V to the probe from a 5 to 24 V
power source. 12V power is recommended for use with Campbell Scientific
dataloggers. Where minimizing power use is important, power can be
switched on and off for the measurement provided there is a three-second
warm-up delay. Switching power avoids the constant current flow through
datalogger ground, which can affect the accuracy of low level single-ended
voltage measurements, primarily with older dataloggers such as the 21X.
Probes are polarity protected by the keyed connector and a 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.
Teflon filter: Recommended for marine environments, slower
response time than the polyethylene filter, ordered separately.
Campbell Scientific offers the HC2S3-L and HC2S3-QD. The HC2S3-L has a
user-supplied cable length and several cable termination options. When the
HC2S3-L is ordered, enter the cable length, in feet, after the –L; for example,
HC2S3-L11 for a probe with an 11 foot cable. TABLE 5-1 gives the
recommended lengths for various mounts.
TABLE 5-1. Recommended Lead Lengths
2 m Height Atop a tripod or tower via a 2 ft crossarm such as the CM202
Mast/Leg CM202 CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30
9' 11' 11' 14' 14' 19' 24' 14' 24' 37'
Note: Add two feet to the cable length if you are mounting the enclosure on the leg base of a CM106 or CM110
series tripod.
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