Campbell 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
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. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell's obligation under this warranty is
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
carrier prepaid within the continental United States of America. To all other
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
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 [phone]. 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.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a "Statement of Product Cleanliness
and Decontamination" form and comply with the requirements specified in it.
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completed form must be either emailed to [e-mail] or faxed to
[phone]. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
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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
i

Table of Contents
ii
Appendices
A. Absolute Humidity ..................................................A-1
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
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. 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

Model HC2S3 Temperature and Relative
Humidity Probe
1. Introduction
The HC2S3 is a rugged, accurate temperature/RH probe that is ideal for long-
term, 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

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