Campbell Scientific UT20, UT30 User Manual

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INSTRUCTION MANUAL

UT20 and UT30 Tower-based

Campbell Scientific, Inc.

Weather Stations

Revision: 9/14

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. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty. CSI’s obligation under this warranty is limited to repairing or replacing (at CSI’s option) defective Products, which shall be the sole and exclusive remedy under this warranty. The Customer assumes all costs of removing, reinstalling, and shipping defective Products to CSI. CSI will return such Products by surface carrier prepaid within the continental United States of America. To all other locations, CSI will return such Products best way CIP (port of entry) per Incoterms ® 2010. 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 CSI such as programming to customer specifications, electrical connections to Products manufactured by CSI, and Product specific training, is part of CSI’s product warranty. CSI EXPRESSLY DISCLAIMS AND

EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CSI hereby disclaims, to the fullest extent allowed by applicable law, any and all warranties and conditions with respect to the Products, whether express, implied or statutory, other than those expressly provided herein.”

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) 227-9000. After an application 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. The form is available from our web site at www.campbellsci.com/repair. A completed form must be either emailed to repair@campbellsci.com or faxed to (435) 227-9106. Campbell Scientific is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense. Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.

Precautions

DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND

TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS,

TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR ORGANIZATION’S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits. Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or by telephoning (435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

• Prior to performing site or installation work, obtain required approvals and permits. Comply

with all governing structure-height regulations, such as those of the FAA in the USA.

• Use only qualified personnel for installation, use, and maintenance of tripods and towers, and

any attachments to tripods and towers. The use of licensed and qualified contractors is highly recommended.

• Read all applicable instructions carefully and understand procedures thoroughly before

beginning work.

• Wear a hardhat and eye protection, and take other appropriate safety precautions while

working on or around tripods and towers.

• Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take

reasonable precautions to secure tripod and tower sites from trespassers.

• Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

• You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are

installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with overhead or underground utility lines.

• Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the

distance required by applicable law, whichever is greater, between overhead utility lines and the structure (tripod, tower, attachments, or tools).

• Prior to performing site or installation work, inform all utility companies and have all

underground utilities marked.

• Comply with all electrical codes. Electrical equipment and related grounding devices should

be installed by a licensed and qualified electrician.

Elevated Work and Weather

• Exercise extreme caution when performing elevated work.

• Use appropriate equipment and safety practices.

• During installation and maintenance, keep tower and tripod sites clear of un-trained or non-

essential personnel. Take precautions to prevent elevated tools and objects from dropping.

• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

• Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks,

frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions.

• 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.

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

2.1 Site Selection ....................................................................................... 1

2.2 Tower Mounting .................................................................................. 1

2.3 Tower Installation ................................................................................ 2

3. Initial Inspection ......................................................... 2

3.1 Indoors ................................................................................................. 2

3.2 Outdoors ............................................................................................... 2

3.3 Tools Required ..................................................................................... 3

3.3.1 Tools for Tower Installation ......................................................... 3

3.3.2 Tools for Instrumentation and Maintenance ................................. 3

3.3.3 Supplies for Power and Communications Options ....................... 4

4. Siting and Exposure ................................................... 4

4.1 Wind Speed and Direction ................................................................... 4

4.2 Temperature and Relative Humidity .................................................... 5

4.3 Precipitation ......................................................................................... 5

4.4 Solar Radiation ..................................................................................... 6

4.5 Soil Temperature .................................................................................. 6

4.6 Siting References ................................................................................. 6

5. Overview ...................................................................... 7

6. Specifications ............................................................. 8

7. UT20/UT30 Tower Installation .................................... 9

7.1 Installing the UT20/UT30 .................................................................... 9

7.1.1 Base and Guy Anchor Layout ....................................................... 9

7.1.2 Tower Base Installation .............................................................. 10

7.1.2.1 B18 Base Installation ....................................................... 10

7.1.2.2 RFM18 Base Installation .................................................. 13

7.1.3 Guy Anchor Installation .............................................................. 13

7.1.3.1 UTEYE Eyebolt Guy Anchor ........................................... 13

7.1.3.2 UTDUK Duckbill Guy Anchor ........................................ 13

7.1.4 Tower Assembly ......................................................................... 15

7.1.5 UTGND Tower Grounding Kit ................................................... 15

7.2 Sensor Mounting Brackets ................................................................. 18

7.2.1 CM202, COM202SS, CM203, CM204, CM204SS, or CM206 .. 18

7.2.2 Gill Radiation Shields ................................................................. 18

7.2.2.1 41303-5A, 41003-5, 41005-5 ........................................... 18

7.2.3 Solar Radiation Mounts .............................................................. 18

7.2.3.1 CM225 Solar Radiation Stand .......................................... 18

Table of Contents

8. Preparing the Tower for Use .................................... 20

8.1 Enclosure, Datalogger, Power Supply ............................................... 20

8.1.1 Enclosure .................................................................................... 20

8.1.2 CR1000 Datalogger .................................................................... 23

8.1.3 BPALK Alkaline Power Supply ................................................ 23

8.1.4 PS100 Rechargeable Power Supply ........................................... 23

8.1.5 SP10 Solar Panel ........................................................................ 24

8.2 Sensor Connection ............................................................................. 26

8.3 Communication and Data Storage Peripherals .................................. 27

8.3.1 CFM100, NL115, or NL120 ...................................................... 27

8.3.2 COM220 Phone Modems ........................................................... 27

8.3.3 Cellular Transceivers ................................................................. 28

8.3.4 SRM-5A Rad Modem and SC932A Interface ............................ 29

8.3.4.1 SRM-5A at the Datalogger .............................................. 29

8.3.4.2 SRM-5A at the Computer ................................................ 29

8.3.5 RF500M RF Modem and RF310-Series Transceivers ............... 32

8.3.5.1 RF500M Modem Configuration ...................................... 32

8.3.5.2 RF500M RF Base Station ................................................ 33

8.3.5.3 Install Nearest Repeater/Field Station ............................. 34

8.3.6 MD485 Multidrop Interface ....................................................... 34

8.3.6.1 MD485 Multidrop Interface at the Datalogger ................ 34

8.3.6.2 MD485 Multidrop Interface at the Computer .................. 34

8.4 Sealing and Desiccating the Enclosure .............................................. 35

8.5 Sensor Installation ............................................................................. 37

8.5.1 034B Met One Windset .............................................................. 37

8.5.2 05103, 05103-45, 05106, and 05305 RM Young Wind

Monitors .................................................................................. 38

8.5.3 03002 RM Young Wind Sentry Wind Set .................................. 39

8.5.3.1 03002 Mounted to the Mast ............................................. 39

8.5.3.2 03002 Mounted to a CM200-Series Crossarm................. 39

8.5.4 Licor Silicon Radiation Sensors (LI200X, LI200S, LI190SB) .. 40

8.5.5 107/108 Temperature Probe ....................................................... 41

8.5.6 107/108 Soil Temperature Probe ................................................ 41

8.5.7 HMP60 Vaisala Temperature and RH Probe ............................. 42

8.5.8 HC2S3 Rotronic Temperature and RH Probe ............................ 43

8.5.9 HMP155A Vaisala Temperature and RH Probe ........................ 44

8.5.10 CS100 or CS106 Vaisala Barometric Pressure Sensor ............... 44

8.5.11 Texas Electronics Tipping Bucket Rain Gages (TE525,

TE525WS, TE525MM) .......................................................... 45

8.5.12 TB4, TB4MM, or CS700 Rain Gage ......................................... 46

8.5.13 SR50A Sonic Ranging Sensor .................................................... 47

8.5.13.1 Beam Angle ..................................................................... 47

8.5.13.2 Mounting Height ............................................................. 47

8.5.13.2.1 Reference Point ..................................................... 47

8.5.13.3 Mounting Options ............................................................ 48

8.5.14 CS616 Water Content Reflectometer ......................................... 50

8.5.15 237 Leaf Wetness Sensor ........................................................... 51

8.5.16 257 Soil Moisture Sensor ........................................................... 52

8.5.17 Enclosure Humidity Sensor ........................................................ 53

8.5.18 Wind Direction Sensor Orientation ............................................ 53

8.5.18.1 Determining True North and Sensor Orientation ............. 53

8.5.18.2 National Geophysical Data Center Web Site ................... 55

9. Maintenance and Troubleshooting .......................... 56

Table of Contents

9.1 Maintenance ....................................................................................... 56

9.1.1 Instrumentation Maintenance ...................................................... 56

9.1.2 Batteries ...................................................................................... 56

9.1.3 Desiccant ..................................................................................... 56

9.1.4 Sensor Maintenance .................................................................... 57

9.2 Troubleshooting ................................................................................. 58

9.2.1 No Response Using the Keypad.................................................. 58

9.2.2 No Response from Datalogger through SC32B or Modem

Peripheral ................................................................................ 58

9.2.3 NaN Displayed in a Variable ...................................................... 59

9.2.4 Unreasonable Results Displayed in a Variable ........................... 59

10. Standard Software Installation ................................ 59

10.1 Datalogger Program ........................................................................... 59

10.2 Weather Station or Datalogger Support Suite .................................... 60

10.3 Quick Start Review ............................................................................ 60

Appendix A. RFM18 Base Dimensions ..................... A-1

Figures

4-1. Effect of structure on wind flow .......................................................... 6

5-1. UT10 tower .......................................................................................... 7

7-1. UT20/UT30 weather tower .................................................................. 9

7-2. Guy anchor locations ......................................................................... 10

7-3. J-bolt template assembly .................................................................... 11

7-4. Positioning the J-bolt in concrete ....................................................... 11

7-5. UT20/UT30 mounting foot detail view .............................................. 12

7-6. B18 concrete mounting base .............................................................. 14

7-7. RFM18 flat roof mounting base ......................................................... 14

7-8. UTEYE eyebolt guy anchor ............................................................... 14

7-9. UTDUK duckbill guy anchor ............................................................. 16

7-10. Guy wire attached to tower ................................................................ 16

7-11. Guy wire/turnbuckle attached to UTEYE anchor .............................. 17

7-12. Ground rod and clamp ........................................................................ 17

7-13. Tower grounding clamp ..................................................................... 18

7-14. Top view of tower .............................................................................. 19

7-15. CM210 crossarm-to-pole bracket (top) is included with the

crossarm for attaching the crossarm to the tower’s mast or leg ...... 19

7-16. CM225 Solar Radiation Mount with a LI2003S Leveling Base

and LI200X Solar Radiation Sensor ............................................... 20

8-1. Enclosure brackets configured for a tower mount .............................. 21

8-2. This exploded view shows the components of a “-TM” bracket

option .............................................................................................. 22

8-3. An enclosure attached to two tower legs ............................................ 22

8-4. BPALK 12 volt power supply ............................................................ 24

8-5. CR1000 and PS100 mounted to an enclosure backplate .................... 25

8-6. SP10 solar panel ................................................................................. 25

8-7. Routing and wiring sensor leads to the datalogger ............................. 26

8-8. The NL115 connects to the CR1000’s peripheral port allowing

data to be stored on removable Compact Flash cards ..................... 27

8-9. COM220 modem with surge protector............................................... 28

8-10. SRM-5A Rad Modem and SC932A Interface .................................... 30

8-11. SRM-5A wiring ................................................................................. 31

iii

Table of Contents

8-12. You can configure any two types of interface ports (RS-485,

RS-232, and CS I/O) to be used at a time ...................................... 35

8-13. Enclosure Supply Kit ........................................................................ 36

8-14. Met One 034B Wind Speed and Direction Sensor ............................ 37

8-15. 05103 RM Young Wind Monitor ...................................................... 38

8-16. 03002 mounted to a CM200-series Crossarm ................................... 39

8-17. LI200X/LI200S/LI190SB and LI2003S Leveling Fixture ................ 40

8-18. 107 Temperature Probe ..................................................................... 41

8-19. HMP60 Temperature and RH Probe ................................................. 42

8-20. HC2S3 Rotronic Temperature and RH Probe ................................... 43

8-21. HMP155A Vaisala Temperature and RH Probe ................................ 44

8-22. TE525 Texas Electronics Rain Gage ................................................. 45

8-23. TB4 or TB4MM mounted onto a CM310 pole via the CM240

mount ............................................................................................. 46

8-24. Beam angle clearance ........................................................................ 47

8-25. Distance from edge of transducer housing to grill ............................. 48

8-26. SR50A mounted to a crossarm via the 19517 Mounting Kit ............. 48

8-27. The SR50A mounted to the crossarm shown from another angle ..... 49

8-28. SR50A - mounted using NU-RAIL and C2151 mounting stem ........ 49

8-29. CS650G Insertion Guide Tool ........................................................... 50

8-30. 237 Leaf Wetness Sensor .................................................................. 51

8-31. 257 Soil Moisture Sensor .................................................................. 52

8-32. CS210 installed on a CR1000 ........................................................... 53

8-33. Magnetic declination for the contiguous United States ..................... 54

8-34. Declination angles east of True North are subtracted from 360 to

get True North ................................................................................ 55

8-35. Declination angles west of True North are added to 0 to get True

North .............................................................................................. 55

UT20 and UT30 Tower-based Weather Stations

1. Introduction

The UT20 and UT30 are durable, lightweight instrument towers that can be used for a variety of applications. They support a 6 m (20 ft) or 9 m (30 ft) measurement height for wind sensors as well as sturdy attachment points for antennas, solar panels, environmental enclosures, radiation shields, and crossarms.

2. Cautionary Statements

2.1 Site Selection

• Select a safe site to install the tower.

• The distance between any power lines and the installation site should be at

least one and one-half times the height of the tower. Make the distance even greater, if at all possible. Since all overhead power lines look somewhat alike, consider them all dangerous and stay well away from them.

• If there are power lines or buried utilities in the area, call the local utility

providers for assistance.

2.2 Tower Mounting

• NEVER work alone; always have someone near who can summon help.

• Certain clothing may provide a degree of safety, but don’t depend on it

alone to preserve life (rubber boots or shoes, industrial rubber gloves and a long sleeve shirt or jacket).

• Check local weather conditions. Be sure that it has not rained recently and

that the ground is not wet or muddy. Make sure that rain or thunderstorms are not predicted for the day the tower is to be installed.

• The wind can blow the tower into a nearby power line. Do not install or

remove towers in moderate or heavy winds.

• If it is necessary to use a ladder, make sure it is made of non-conductive

(non-metallic) material. (This safety rule applies whenever working with electrical equipment.)

• If possible, have someone present who has been trained in electric shock

first aid.

UT20 and UT30 Tower-based Weather Stations

2.3 Tower Installation

• Properly assemble the tower according to instructions (do this where the

tower is to be put up).

• Once the tower is up in the full vertical position, securely fasten it to the

base using 5/8-inch nuts and washers.

• Ground the tower according to the National Electrical Code.

3. Initial Inspection

3.1 Indoors

• Immediately upon receipt of your shipment…

o Open shipping cartons.

o Check contents against invoice. Contact Campbell Scientific

immediately about any shortages.

• Several days prior to the planned installation date…

3.2 Outdoors

o Collect tools and site information (Section 3.3, Tools Required, and 4,

Siting and Exposure).

o Assemble datalogger, communications device, and power supply in

enclosure (Section 8, Preparing the Tower for Use).

o Install datalogger support software on PC (Section 10, Standard

Software Installation).

o Establish communications between the datalogger and the PC (Section

10, Standard Software Installation).

o Program datalogger, test sensors, and retrieve data (Section 10,

Standard Software Installation).

o Trial run the tower / tripod installation, assembling as much as

possible (Section 7, UT20/UT30 Tower Installation).

o Repackage equipment for transport to the field site.

• Locate suitable site (Section 4, Siting and Exposure).

• Prepare tower base (Section 7, UT20/UT30 Tower Installation).

o Install 3 to 10 meter level sensors (Section 8.5, Sensor Installation).

o Raise tower (Section 7, UT20/UT30 Tower Installation).

o Install instrumentation enclosure (Section 7, UT20/UT30 Tower

Installation).

o Install 0 to 3 meter level sensors (Section 8.5, Sensor Installation).

3.3 Tools Required

Tools required to install and maintain a weather station are listed below.

3.3.1 Tools for Tower Installation

Shovel Rake Open end wrenches: 3/8 in, 7/16 in, 1/2 in, (2) 9/16 in Magnetic compass Step ladder (6 ft) Tape measure (12 to 20 ft) Nut driver (3/8 in) Level (36 to 48 in) Small sledge hammer Pliers Tie wire Climbing harness Hard hat Haul rope (50 ft) Non-stretch line (20 ft) Wire rope cutters Materials for B18 Base and UTEYE Anchors:

(4) Wood stakes (12 in) Pick or digging bar Concrete form materials (2 x 4 in lumber, stakes, saw, hammer, nails, etc.) Concrete trowel and edger

Materials for UTDUK Duckbill Anchors

Sledgehammer Highlift jack Chain (to attach jack to anchor loops)

Materials for RFM18 Base:

(4) anchors appropriate for mounting surface (4) bolts and washers to secure base to anchors

UT20 and UT30 Tower-based Weather Stations

3.3.2 Tools for Instrumentation and Maintenance

Lock and key for enclosure Magnetic declination angle (Section 8.5, Sensor Installation) Magnetic compass Straight bit screwdrivers (small, medium, large) Phillips-head screwdrivers (small, medium) Small diagonal side-cuts Needle-nose pliers Wire strippers Pocket knife Calculator Volt / Ohm Meter Electrical Tape Step ladder (6 ft) Datalogger prompt sheet (Section 9, Maintenance and Troubleshooting) Station manuals Station log and pen Open end wrenches: 3/8 in, 7/16 in, 1/2 in, (2) 9/16 in Socket wrench and 7/16 in deep well socket Adjustable wrench

UT20 and UT30 Tower-based Weather Stations

CAUTION

Pliers Conduit and associated tools (as required) Felt-tipped marking pen Claw hammer Pipe wrench (12 in) Tape measure (12 to 20 ft) 3/8 in nut driver Level (36 to 48 in) Pliers Climbing harness Hard hats 50 ft haul rope Crescent wrench Channel-lock pliers 1/4 in washers (spacers for U-bolts) 5/64 in Allen hex wrench

3.3.3 Supplies for Power and Communications Options

AC Power Wire, conduit, and junction boxes as needed

Phone Modem Hayes compatible calling modem for PC Phone line to weather station or junction box

Short-Haul Modem 4 Conductor communications cable from PC to weather station or junction box 6 ft copper ground rod and clamp for PC surge protection (optional)

4. Siting and Exposure

If any part of the weather station comes in contact with power lines, you could be killed. Contact local utilities for the location of buried utility lines before digging or driving ground rods.

Selecting an appropriate site for the weather station is critical in order to obtain accurate meteorological data. In general, the site should be representative of the general area of interest, and away from the influence of obstructions such as buildings and trees.

The weather station should not be located where sprinkler irrigation water will strike sensors or instrument enclosure.

Some general guidelines for site selection are listed below, which were condensed from EPA (1988)

4.1 Wind Speed and Direction

, WMO (1983)2, and AASC (1985)3 publications.

Wind sensors should be located over open level terrain, and at a distance of at least ten times (EPA) the height of any nearby building, tree or other obstruction, as illustrated in FIGURE 4-1.

UT20 and UT30 Tower-based Weather Stations

Standard measurement heights:

3.0 m ± 0.1 m recommended (AASC)

2.0 m ± 0.1 m, 10.0 m ± 0.5 m optional (AASC)

10.0 m (WMO and EPA)

4.2 Temperature and Relative Humidity

Sensors should be located over an open level area at least 9 m (EPA) in diameter. The surface should be covered by short grass, or where grass does not grow, the natural earth surface. Sensors should be located at a distance of at least four times the height of any nearby obstruction and at least 30 m (EPA) from large paved areas. Sensors should be protected from thermal radiation, and adequately ventilated.

Situations to avoid include:

• large industrial heat sources

• rooftops

• steep slopes

• sheltered hollows

• high vegetation

• shaded areas

• swamps

• areas where snow drifts occur

• low places holding standing water after rains

Standard measurement heights:

1.5 m ± 1.0 m (AASC)

1.25 - 2.0 m (WMO)

2.0 m temperature (EPA)

2.0 m and 10.0 m for temperature difference (EPA)

4.3 Precipitation

A rain gage should be sited on level ground that is covered with short grass or gravel. In open areas, the distance to obstructions should be two to four times (EPA, AASC) the height of the obstruction.

The height of the opening should be as low as possible, but should be high enough to avoid splashing from the ground. Wind shields, such as those used by the National Weather Service, are recommended for open areas.

Collectors should be heated, if necessary, to properly measure frozen precipitation. The gage must be mounted above the average level of snow accumulation in areas that experience significant snowfall.

Standard measurement heights:

1.0 m ± 1.0 cm (AASC)

30.0 cm minimum (WMO, EPA)

UT20 and UT30 Tower-based Weather Stations

4.4 Solar Radiation

Pyranometers should be located to avoid shadows on the sensor at any time. Mounting it on the southernmost (northern hemisphere) portion of the weather station will minimize the chance of shading from other weather station structures. Reflective surfaces and sources of artificial radiation should be avoided. The height at which the sensor is mounted is not critical.

4.5 Soil Temperature

The measurement site for soil temperature should be at least 1 m2 and typical of the surface of interest. The ground surface should be level with respect to the immediate area (10 m radius).

Standard measurement depths:

10.0 cm ± 1.0 cm (AASC)

5.0 cm, 10.0 cm, 50.0 cm, 100.0 cm (WMO)

FIGURE 4-1. Effect of structure on wind flow

4.6 Siting References

EPA, (1987). On-Site Meteorological Program Guidance for Regulatory Modeling Applications, EPA-450/4-87-013. Office of Air Quality Planning and Standards, Research Triangle Park, North Carolina 27711.

WMO, (1983). Guide to Meteorological Instruments and Methods of Observation. World Meteorological Organization No. 8, 5th edition, Geneva, Switzerland.

5. Overview

UT20 and UT30 Tower-based Weather Stations

The State Climatologist, (1985) Publication of the American Association of State Climatologists: Height and Exposure Standards for Sensors on Automated Weather Stations, v. 9, No. 4 October, 1985.

EPA, (1989). Quality Assurance Handbook for Air Pollution Measurement Systems, EPA Office of Research and Development, Research Triangle Park, North Carolina 27711.

The UT20/UT30 tower is a versatile mount for sensors, antennas, solar panels, environmental enclosures, radiation shields, and mounting crossarms. Its 6 m (20 ft) or 9 m (30 ft) height allows for wind measurements at that height.

The tower consists of 2.5 cm (1 in) OD corrosion-resistant aluminum tubing. It includes an adjustable mast, a hinged base, anchor bolts, lightning rod, grounding rod, and cable tie kit.

Enclosures purchased for use with this tower must be ordered with the “-TM” option. This will provide the necessary bracketing to mount the enclosure to the tower.

FIGURE 5-1. UT10 tower

UT20 and UT30 Tower-based Weather Stations

6. Specifications

UT20 Measurement Height: 6 m (20 ft)

UT30 Measurement Height: 10 m (30 ft)

UT20 Shipping Weight: 23 kg (50 lb)

UT30 Shipping Weight: 29 kg (65 lb)

Material: hardened drawn 6063-T832 aluminum

Vertical Pipe Outer Diameter: 2.5 cm (1 in)

Cross Support Pipe Outer Diameter: 0.953 cm (0.375 in)

UT20 Guyed Tower Area Requirements: ~3.5 m (11.5 ft) radius

UT30 Guyed Tower Area Requirements: ~5 m (17 ft) radius

Required Concrete Pad Dimensions forB18 Concrete Mounting Base (see note 1): 91 L x 91 W x 122 D cm (36 x 36 x 48 in)

Maximum Wind Load Recommendations (see note 2): 110 mph (B18 base unguyed);

110 mph (RFM18 base w/UTGUY)

Notes:

1. The concrete pad requirements assume heavy soil; light, shifting, or sandy soils require a bigger concrete pad.

2. The recommended wind load assumes proper installation, proper anchoring, and total instrument projected area of less than two square feet. For the RFM18 base, the wind load recommendation also assumes that the UTGUY’s turnbuckles are preloaded just enough to equalize tension and that the tower is guyed at 60 degree angle relative to the ground (maximum). The amount of wind load that these towers can withstand is affected by quality of anchoring and installation, guy wire tension, soil type, guy angle, and the number, type, and location of instruments fastened to the tower.

3. The UT30 is Universal Towers’ model #9-30. A more detailed drawing of this tower is available at www.universaltowers.com.

UT20 and UT30 Tower-based Weather Stations

7. UT20/UT30 Tower Installation

7.1 Installing the UT20/UT30

The UT20/UT30 tower provides a support structure for mounting the weather station components. FIGURE 7-1 shows a typical UT20/UT30 equipped with an instrumentation enclosure, meteorological sensors, and a solar panel.

FIGURE 7-1. UT20/UT30 weather tower

7.1.1 Base and Guy Anchor Layout

The UT20/UT30 tower attaches to a user-supplied concrete foundation as shown in FIGURE 7-1. The base brackets, anchor bolts, and nuts are included with the tower.

A guyed UT20 tower requires an area approximately 11.5 feet in radius, and a guyed UT30 tower requires an area approximately 17 feet in radius. Brush and tall weeds need to be removed. Otherwise, the natural vegetation and ground surface should be disturbed as little as possible.

Drive a stake where the base of the tower will be located. Attach a line to the stake and scribe a circle with an 11.5 foot radius for the UT20 or a 17 foot radius for the UT30. Drive a stake on the scribed line opposite the direction the tower will hinge for the first guy anchor location (FIGURE 7-2).

When using a UT30 on level ground, lay out the remaining two anchor locations by measuring 29.5 feet from the first anchor to the scribed line on either side of the base stake (FIGURE 7-2). When using a UT20 on level

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ground, lay out the two remaining anchor locations 10 feet from the first anchor to the scribed line on either side of the base stake.

FIGURE 7-2. Guy anchor locations

On unlevel ground, use a compass at the base stake to lay out the remaining two anchor locations 120 degrees from the first. Vary the distance between the tower and each anchor so that the angle between the tower and the guy wire will be approximately 30 degrees.

7.1.2 Tower Base Installation

There are two base options: the B18 base is poured in concrete; the RFM18 roof mount base is anchored to a flat surface.

7.1.2.1 B18 Base Installation

1. Dig a hole 36 inches square and 48 inches deep. Lighter soils will require

a deeper hole.

2. Assemble the J-bolt template as shown in FIGURE 7-3. Begin by

threading two 5/8-inch nuts onto each J-bolt, followed by a 5/8-inch washer. Next, place a template piece over the J-bolt, followed by another 5/8-inch washer and a 5/8-inch split lock washer. Thread a third 5/8-inch nut onto the J-bolt just until the bolt is even with the top of the bolt. Once all three J-bolts are assembled, slide them together as shown in FIGURE

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7-3. Align each J-bolt so the angled portion is pointing outward and tighten the lower nuts to secure the assembly.

FIGURE 7-3. J-bolt template assembly

3. Construct a concrete form as shown in FIGURE 7-4 out of 2-inch x 4-inch lumber, 24 inches square (inside dimensions). Construct the 1-inch x 2inch template frame and set it aside. Center the form over the hole and drive a stake centered along the outside edge of each side. Level the form by driving nails through the stakes and into the form while holding the form level.

FIGURE 7-4. Positioning the J-bolt in concrete

4. Position the J-bolt template as shown in FIGURE 7-3. The top of each bolt will be 3.00 inches ±0.25 inches above the level of the form. Level the tops of the J-bolts in all directions using a small level and secure the

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CAUTION

J-bolt template to the template frame with 7/8-inch screws where holes in the template overlap the wooden frame.

5. Fill the hole and form with concrete. Screed the concrete level with the top of the form as shown in FIGURE 7-3. Smooth the concrete around the three J-bolts and allow the concrete to harden.

It is common for air to be trapped behind the knee portion of a J-bolt. Use a stick or rod to stir and tamp around each Jbolt to ensure proper anchoring.

6. Remove the top nuts, washers, and J-bolt template pieces. Leave the two bottom nuts and one flat washer on each J-bolt. Remove the template frame and the concrete form.

7. Attach a mounting foot (FIGURE 7-5) to each leg on the bottom section of the tower with a 3/8-16 x 2.000-inch bolt and washer. Place the bottom section onto the three J-bolts in the tower base and secure each leg with a 5/8-inch flat washer, a 5/8-inch split washer, and a 5/8-inch nut. Hand tighten each nut at this time.

FIGURE 7-5. UT20/UT30 mounting foot detail view

8. Check the UT20/UT30 for plumb using a level and adjust the leveling nuts

WARNING

below the mounting feet on the J-bolts as required. When the tower is plumb, use two wrenches to lock the leveling nuts on each J-bolt together. Tighten the upper nuts to secure the base.

9. Removing the lower 3/8-inch bolt on the rear (south) leg allows the tower to be hinged to the ground. If a ladder is available, it is easier to leave the tower upright.

7.1.2.2 RFM18 Base Installation

1. Position the RFM18 on the surface where it will be installed. Make sure the hinge direction is correct and mark the locations of the four mounting holes. A drawing showing RFM18 dimensions and hole spacing is shown in Appendix A. Install an appropriate anchor (user-supplied) for each hole.

2. Attach the bottom section of the tower to the RFM18 base using one bolt per leg (FIGURE 7-7). Position the base over the anchor holes. Secure the base to the anchors with appropriate hardware (user-supplied). Check the tower for plumb and shim the RFM18 if necessary before fully tightening the bolts.

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7.1.3 Guy Anchor Installation

There are two types of anchors for the tower guy wires: the UTEYE eye bolts are poured in concrete; the UTDUK duckbill anchors are driven into the soil.

7.1.3.1 UTEYE Eyebolt Guy Anchor

1. Dig a hole 24 inches square by 24 inches deep at each anchor location (Section 7.1.1, Base and Guy Anchor Layout).

2. Optional  construct a concrete form out of 2-inch x 4-inch lumber, 24 inches square (inside dimensions) for each hole. Center the forms over the holes and level them using a carpenter’s level and stakes.

3. Fill the holes with concrete and install the eyebolts as shown in FIGURE 7-8.

7.1.3.2 UTDUK Duckbill Guy Anchor

1. Locate the three anchor locations (Section 7.1.1, Base and Guy Anchor Layout). It is important that the anchors be driven at the same angle as the

guy wires (FIGURE 7-9). Insert the steel drive bar into the anchor body and drive the anchor into the ground using a fence post driver or sledgehammer until only the top half of the loop remains above the ground.

2. Attach a high-lift jack to the loop and jack the anchor up about 6 inches to rotate the anchor into the load-lock position.

Failure to install and lock the anchor at the correct angle will result in the anchor cable cutting through the soil until the angles equalize, causing slack in the guy wires.

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Eyebolt

Cement Foundation

Tower →

RFM18

Mounting Hole (4) places

FIGURE 7-6. B18 concrete mounting base

FIGURE 7-7. RFM18 flat roof mounting base

FIGURE 7-8. UTEYE eyebolt guy anchor

7.1.4 Tower Assembly

1. Having previously installed the base and bottom tower section (Section

7.1.3, UTDUK Duckbill Guy Anchor), remove the bolt from the rear tower leg, and loosen the bolt in the side legs so the bottom tower section is free to hinge. Tilt the tower section to the ground and assemble the remaining sections and mast using the hardware provided with the tower.

2. Install the guy wires to the top of the tower (FIGURE 7-10). Cut the 120foot piece of guy wire into three pieces; lengths will vary with slope. Attach the guy wires to the tower using two U-bolts for each guy wire.

3. Mounting brackets and sensors that attach to upper tower sections are most easily attached while the tower is lying on the ground.

4. “Walk” the tower to its upright position and install the remaining bolts in the tower base.

5. Attach the guy wires to the anchors (FIGURE 7-11). Unscrew the jaw and eye bolts until 1 inch of thread extends through the turnbuckle body. Attach the jaw end of the turnbuckles to the anchors. While holding the tower plumb, attach the guy wires to the eye end of the turnbuckles using a thimble and two U-bolts for each guy wire. Tighten the turnbuckles until the guy wires are snug and the tower is plumb. Do not overtighten the turnbuckles.

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7.1.5 UTGND Tower Grounding Kit

1. Drive the ground rod close to the tower (FIGURE 7-14) using a fence post driver or sledgehammer. Drive the rod at an angle if an impenetrable hardpan layer exists. In hard clay soils, a gallon milk jug of water can be used to “prime” the soil and hole to make driving the rod easier.

2. Loosen the bolt that attaches the clamp to the ground rod. Insert one end of the 4 AWG wire between the rod and the clamp and tighten the bolt (FIGURE 7-12).

3. Attach the tower grounding clamp to a tower leg (FIGURE 7-13). Route the 4 AWG wire attached to the ground rod up the tower leg to the grounding clamp. Loosen the set screw and insert the 4 AWG wire and the 24 AWG enclosure ground wire into the hole behind the set screw and tighten the set screw. Route the green wire to where the enclosure will be installed.

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Drive Bar

Duckbill Anchor

U-bolts (2) places

FIGURE 7-9. UTDUK duckbill guy anchor

FIGURE 7-10. Guy wire attached to tower

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Clamp

Ground Rod

Turnbuckle Thimble

U-bolt (2) places

FIGURE 7-11. Guy wire/turnbuckle attached to UTEYE anchor

FIGURE 7-12. Ground rod and clamp

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Wire to Ground Rod

Wire to Enclosure

Clamp

FIGURE 7-13. Tower grounding clamp

7.2 Sensor Mounting Brackets

Sensor mounting brackets provide a means of mounting the sensors to the tower. General orientation of the mounting brackets is shown in FIGURE 7-14.

7.2.1 CM202, COM202SS, CM203, CM204, CM204SS, or CM206

1. Attach the crossarm at the desired height via the provided U-bolts and nuts

(FIGURE 7-15).

7.2.2 Gill Radiation Shields

7.2.2.1 41303-5A, 41003-5, 41005-5

1. Attach the radiation shield to the tower leg, tower mast, or CM200-series

crossarm with the U-bolt and nuts provided. If attaching to the tower leg or mast, place U-bolt in the radiation shield’s side holes. If attaching to a crossarm, place the U-bolt in the radiation shield’s bottom holes.

7.2.3 Solar Radiation Mounts

7.2.3.1 CM225 Solar Radiation Stand

1. If using a LI200X, LI190SP, or CS300, attach the LI2003S or 18356

leveling base to the CM225 using the three screws provided.

2. Attach the CM225 to a tower leg, mast, or CM200-series crossarm. If

attaching to a tower leg or mast, place the U-bolt in the CM225’s side holes. If attaching to a crossarm, place the U-bolt in the CM225’s bottom holes (FIGURE 7-16).

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1" NU-RAIL

Enclosure

UT018 Crossarm

Lightning Rod

Ground Rod UT30

RFM18

019ALU Crossarm

3/4" NU-RAIL

NORTH

FIGURE 7-14. Top view of tower

FIGURE 7-15. CM210 crossarm-to-pole bracket (top) is included with

the crossarm for attaching the crossarm to the tower’s mast or leg

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NOTE

FIGURE 7-16. CM225 Solar Radiation Mount with a LI2003S Leveling

Base and LI200X Solar Radiation Sensor

8. Preparing the Tower for Use

8.1 Enclosure, Datalogger, Power Supply

8.1.1 Enclosure

All instrumentation (datalogger, power supply, and communication peripherals) are mounted in the enclosure. A PVC bulkhead port is installed in the enclosure for routing the sensor and communication cables to the instrumentation.

The “-TM” option is used to attach our enclosures to a UT20 or UT30 tower. An enclosure ordered with the “-TM” option will be shipped with a three-piece bracket mounted to the top of the enclosure and an identical three-piece bracket mounted to the bottom of the enclosure. This mounting bracket option uses the same three-piece brackets as the “-MM” option, except the pieces are rearranged so that the flanges are on the side of the bracket instead of in the middle. The distance between the centers of each flange needs to be 17 inches (see FIGURE 8-1, FIGURE 8-2, and FIGURE 8-3).

Enclosures with the “-TM” option are shipped configured for the UT10 tower. Steps 1 through 3 of the following procedure are for configuring the bracket for attachment to a UT20 or UT30 tower.

Attach the enclosure to a UT20 or UT30 tower as follows:

1. Remove the bolts and nuts connecting the bracket to the enclosure.

2. Slide out the flange sections so that the distance between the centers of

each flange is 17 inches (see FIGURE 8-1).

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3. Reattach the bracket to the enclosure using the original bolts and nuts.

4. Position the enclosure on the north side of the mast.

5. Place the enclosure at the desired height. Please note that the

recommended lead lengths for our sensors assume the bottom of the enclosure is 3 feet from the ground.

6. Use the furnished 1.5-inch U-bolts to secure the enclosure to the tower

legs.

7. Route the 14 AWG wire from the brass tower grounding clamp to the

enclosure grounding lug. Strip one inch of insulation from each end of the wire and insert the end of the wire into the grounding lugs and tighten.

FIGURE 8-1. Enclosure brackets configured for a tower mount

The default configuration is for attaching to a UT10 tower (i.e., D = 10.25 inches). To attach to a UT20 or UT30 tower, move the flange sections of the bracket so that D = 17 inches.

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Flange Section

FIGURE 8-2. This exploded view shows the components of

a “-TM” bracket option

FIGURE 8-3. An enclosure attached to two tower legs

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NOTE

WARNING

8.1.2 CR1000 Datalogger

The CR1000 datalogger and PS100 12 V power supply mount to the enclosure backplate as shown in FIGURE 8-5. Two screws (pn 447) attach the CR1000, four screws (pn 505) attach the PS100.

8.1.3 BPALK Alkaline Power Supply

The BPALK battery pack houses eight alkaline “D” cell batteries (FIGURE 8-4). To install the batteries, loosen the thumb screw and remove the cover.

1. Make sure the red and black wires attached to the left end of the BPALK are connected to the “12 V” and “G” terminals on the CR1000.

2. Disconnect the battery pack from the external connector on the left end of the BPALK. Remove the battery pack and insert eight alkaline “D” cell batteries. Replace the battery pack.

3. Connect the battery pack to the external connector labeled “INTERNAL BATTERY” and replace the cover.

8.1.4 PS100 Rechargeable Power Supply

The PS100 houses a sealed monoblock rechargeable battery. To install the battery, loosen the two thumb screws and remove the cover.

1. With the PS100 power switch “OFF”, insert the battery and plug the battery lead into the connector labeled “INT”.

2. Make sure the red and black wires attached to the “+12 V” and “ terminals on the PS100 are connected to the “12 V” and “G” terminals on the CR1000 Wiring Panel.

3. An AC transformer or unregulated solar panel (Section 8.1.5, SP10 Solar Panel) should be connected to the PS100 at all times. Connect the lead wires from the transformer or solar panel without regard to polarity to the two terminals labeled “CHG” (FIGURE 8-5); the red LED should light when voltage is present.

The wall transformer converts 120 Vac input to 18 Vac output. Maximum charging current is 1.1 A.

Maximum input voltage into the “CHG” terminals is 26 Vac or 26 Vdc. Do not connect 110 Vac directly to “CHG” terminals.

”

4. Turn power switch to “ON”, and replace cover.

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FIGURE 8-4. BPALK 12 volt power supply

8.1.5 SP10 Solar Panel

Solar panels purchased from Campbell Scientific are shipped with a charge plug taped to the back of the panel. The charge plug is not used with the PS100. Refer to the solar panel manual for installation instructions.

1. Mount the SP10 solar panel to the mast, facing south (northern

hemisphere) as shown in FIGURE 8-6. Position the SP10 at the top of the 1 1/4 inch diameter section of the mast. Install the U-bolt, muffler clamp, and nuts as shown in FIGURE 8-6.

2. The solar panel should be oriented to receive maximum insolation over the

course of the year. Suggested tilt angles (referenced to the horizontal plane) are listed below.

Site Latitude Tilt Angle 0 to 10 degrees 10 degrees 11 to 20 Latitude + 5 degrees 21 to 45 Latitude + 10 degrees 46 to 65 Latitude + 15 degrees > 65 80 degrees

3. After determining the tilt angle, loosen the two bolts that attach the mounting bracket to the panel. Adjust the angle, then tighten the bolts. Secure the lead wire to the mast using wire ties.

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FIGURE 8-5. CR1000 and PS100 mounted to an enclosure backplate

FIGURE 8-6. SP10 solar panel

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8.2 Sensor Connection

1. After the sensors have been mounted, route the sensor leads through the entry hole in the bottom of the enclosure and to the datalogger. Secure the leads to the left side of the enclosure using cable ties and tabs (FIGURE 8-7). Any excess cable should be neatly coiled and secured to the tabs.

2. To connect a lead wire, loosen the appropriate screw terminal and insert the lead wire (wires should be stripped 5/16 inches), and tighten the screw using the screwdriver provided with the datalogger.

If a datalogger program has been developed, the sensors will have to be wired to the channels specified by the measurement instructions.

If a program has not been developed, Short Cut can be used to generate a program and wiring diagram. Run Short Cut, and wire the sensor leads as specified by the wiring diagram in the .DEF file.

For more complex programming, or when sensors are used which are not supported by Short Cut or CRBasic (PC400 or LoggerNet software) must be used. If desired, wire the sensors and develop the program using CRBasic and the measurement instructions as shown in Section 10, Standard Software Installation.

FIGURE 8-7. Routing and wiring sensor leads to the datalogger

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8.3 Communication and Data Storage Peripherals

One or more peripherals (i.e., CompactFlash modules, modems, etc.) can be mounted to the enclosure backplate (ENC12/14, ENC14/16, or ENC16/18 enclosures).

8.3.1 CFM100, NL115, or NL120

Connect the CFM100, NL115, or NL120 module to the CR1000’s peripheral port (see FIGURE 8-8). One CompactFlash card fits in the CFM100 or NL115’s card slot. For the NL115 or NL120, Ethernet communication is supported by connecting a 10baseT Ethernet cable.

8.3.2 COM220 Phone Modems

A phone modem enables communication between the datalogger and the computer (with a Hayes compatible phone modem) over a dedicated telephone line.

Mount the modem to the enclosure backplate as shown in FIGURE 8-9.

1. Mount the modem to the backplate using the four screws and nylon grommets provided.

2. Connect the modem to the datalogger’s I/O port with the SC12 cable provided.

3. The telephone company generally provides surge protection, and a patch cord that plugs into the RJ11C jack. If surge protection has not been provided, the Model 6362 Surge Protector Kit can be installed to the enclosure backplate. Connect the two terminals on the surge protector to the “tip” and “ring” terminals on the modem as shown in FIGURE 8-9.

FIGURE 8-8. The NL115 connects to the CR1000’s peripheral port

allowing data to be stored on removable Compact Flash cards

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FIGURE 8-9. COM220 modem with surge protector

8.3.3 Cellular Transceivers

Campbell Scientific offers two digital cellular modems — the RavenXTV CDMA modem and the LS300G 3G GSM Cellular Gateway modem. Refer to our product brochure for information on choosing the right cellular modem for your weather station.

Mount the digital cellular modem in the enclosure as shown in FIGURE 8-10 with the following steps:

1. Mount the modem to the enclosure backplate using the hardware provided

in the pn 14394 or pn 30988 mounting kit.

2. Connect the modem to the datalogger’s CS I/O port via the SC105

interface or connect the modem to the datalogger’s RS-232 port via the pn 14392 Null Modem Cable.

3. Mount the cellular Yagi antenna on a grounded mast, positioning it to

point toward the nearest cellular tower, with the radiating elements oriented vertically. Route the coaxial cable into the enclosure through the wiring port and connect it to the cellular transceiver’s coaxial connector. Provide strain relief for the cable on the left side of the enclosure with a cable tie and tab.

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8.3.4 SRM-5A Rad Modem and SC932A Interface

Rad Modems enable communication between the datalogger and computer over 4-wire unconditioned telephone line, or cable with two twisted pairs of wires.

The maximum distance between modems is determined by baud rate and wire gauge. At 9600 baud the approximate range is 5.0 miles using 19 gauge wire,

4.0 miles using 26 gauge wire.

Installation requirements depend on the type of cable that is used, and how it is installed (direct burial, conduit, etc.). In general, follow state and local electrical codes.

A recommended rodent-proof burial cable is PN F-02P22BPN, available from ANIXTER. Call ANIXTER at (708) 677-2600 for the name of a local distributor.

8.3.4.1 SRM-5A at the Datalogger

1. Plug the SRM-5A into the SC932A. Position the notched tabs in the mounting bracket over the two screws in the SRM-5A (refer to FIGURE 8-11). Thread the SRM-5A screws through the bracket and into the SC932A.

2. Attach the SRM-5A and SC932A mounting bracket to the enclosure backplate using the two screws and nylon inserts provided (FIGURE 8-10).

3. Connect the SC932A to the datalogger’s I/O port with an SC12 cable.

4. Mount the pn 6361 Surge Protector to the enclosure backplate using the hardware provided. Connect the ground wire to the enclosure ground lug (FIGURE 8-12).

5. Cut a 12 inch long piece of two twisted pair cable and connect it to the SRM-5A as shown in FIGURE 8-12. Fasten the cable to the strain relief tab with a cable tie.

6. Route the cable previously attached to the SRM-5A, and the two twisted pair cable (from the other SRM-5A) to the 6361. Connect the cables as shown in FIGURE 8-12. Strain relief the cables to the side of the enclosure using cable ties and tabs.

8.3.4.2 SRM-5A at the Computer

1. Mount the 6361 (or pn 5563) to a flat surface (close to the computer) using two screws. Ground the center terminal to an earth (or building) ground using a 12 AWG or larger diameter wire.

2. Cut a piece of two twisted pair cable long enough to reach from the 6361 to the computer. Connect the cable to the SRM-5A as shown in FIGURE 8-11. Fasten the cable to the strain relief tab with a cable tie. Connect the SRM-5A to the computer’s serial port.

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3. Route the cable from the remote SRM-5A, and the cable from the SRM5A attached to the computer to the 6361. Connect the cables as shown in FIGURE 8-12. Strain relief the cables using cable ties and tabs.

FIGURE 8-10. SRM-5A Rad Modem and SC932A Interface

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Computer

Datalogger

FIGURE 8-11. SRM-5A wiring

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8.3.5 RF500M RF Modem and RF310-Series Transceivers

Radiotelemetry (RF) enables communications between one or more dataloggers and the computer over an FCC-assigned radio frequency in the VHF or UHF band. The maximum distance between any two communicating stations is approximately 20 miles and must be line-of-sight. Longer distances and rough terrain may require intermediate repeater station(s). Refer to the Radiotelemetry Network Applications manual for RF repeater stations and RF Networks accessed remotely by phone.

8.3.5.1 RF500M Modem Configuration

Device Configuration Utility (DevConfig) software is used to configure the RF500M modem. DevConfig is included with LoggerNet or it can be downloaded for free from the Campbell Scientific web site (www.campbellsci.com). The configuration options can be seen in the following figure:

To configure the RF500M, apply power to the modem, wait for the power-up sequence lights to cycle and then turn off, connect the PC to the RF500M RS232 port with a null modem cable, open DevConfig, highlight the RF500M option in the Device Type list, and click Connect. Press the green configuration button on the RF500M either before or while connected to enable the settings in DevConfig.

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CAUTION

There are five configuration options for the RF500M

1. RF ID – Set the modem address with a value from 1-255. Each RF500M

in the network must have a unique RF ID.

2. CS I/O Settings – Set the CS I/O interface options. Choose the SDC

address that will be used to communicate with the datalogger or if a digital radio is attached and this RF500M is used as an RF Base, select the Connected to PC via SC532 option (requires an SC532(A) between the CS I/O interface and the serial port of the PC). If using the Connected to PC via SC532 option, make sure the RS-232 interface is not set as Connected to PC.

3. RS-232 Settings – Set the RS-232 interface options. Choose whether the

RF500M will be connected to the PC with a null modem cable, if a digital radio will be connected to the RS-232 interface, or it will be connected to a datalogger. If using the Connected to PC option, make sure the CS I/O is not set as Connected to PC via SC532.

4. Baud Rate – Set the baud rate for the RS-232 interface.

5. Sleep-Mode Enabled – Determine if sleep mode functionality will be

enabled for RF300 series radios. In all other cases, this setting will be ignored.

Once the RF500M has been configured, it is ready to be deployed.

8.3.5.2 RF500M RF Base Station

When the RF500M is used in a base station configuration, the PC is attached to the RS-232 port with a null modem cable. If a digital radio is being used on the RS-232 port, the CS I/O port can be configured to communicate with the PC but an SC532(A) and serial cable must be used between the PC and the CS I/O port of the RF500M.

1. Connect the RF500M to 12 V and ground. Connect the radio to 12 V, ground, and the RF Modem (RF500M).

Radio transmission without an antenna connected can damage the radio.

2. Mount the base station antenna in a location that is higher than any surrounding buildings or obstacles.

3. After the antenna is mounted, connect the coax cable between the antenna and radio.

4. Connect a large gauge (approximately 8 AWG) copper wire from the antenna to a good earth ground. This is for lightning protection. This is required for any antenna, especially if the coax cable from the antenna goes inside a building.

5. Connect a null modem cable from the computer serial port to the RS-232 port of the RF500M. If a digital radio is being used on the RS-232 port, an SC532 and serial cable can be used between the PC and the CS I/O port of

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the RF500M. Set the appropriate configuration options in the RF500M with DevConfig depending on the port connected to the PC.

8.3.5.3 Install Nearest Repeater/Field Station

Now install the nearest field station. If it communicates with the base station via a repeater, the repeater station must also be installed. Make sure the correct RF ID has been configured in the RF500M that is being deployed in the remote field station or repeater location.

Following is the order in which a general RF field station should be installed. A repeater station is installed in the same order.

1. Tripod or tower

2. Enclosure and datalogger

3. Antenna – Orient correctly; remember direction and polarization

4. Solar Panel

5. Power Supply

6. Sensors

7. RF Modem – Configure the RF ID according to the site map

8. Radio – Make sure to connect to RF Modem, to power supply, and turn on

power supply

8.3.6 MD485 Multidrop Interface

Campbell Scientific’s MD485 is an intelligent RS-485 interface that permits a PC to address and communicate with one or more dataloggers over a distance of 4000 ft. The distance between the datalogger and computer can be increased by combining it with a phone modem, Ethernet link, or spread spectrum radio.

8.3.6.1 MD485 Multidrop Interface at the Datalogger

1. Mount the MD485 to the enclosure backplate via its onboard bracket.

2. Attach the SC12 cable’s female connector to the MD485’s CS I/O port.

3. Attach the SC12’s male connector to the CR1000’s CS I/O port.

4. Attach the CABLE3CBL cable to one of the MD485’s RS-485 ports.

8.3.6.2 MD485 Multidrop Interface at the Computer

1. Connect the CABLE2TP-L to one of the MD485’s RS-485 ports.

2. Attach one end of the pn 10873 RS-232 cable to the MD485’s RS-232 port.

3. Attach the other end of the pn 10873 RS-232 cable to the computer’s RS232 port.

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Connects to a PC via the pn 10873 cable

Connects to the datalogger CS I/O port via an SC12 cable

Connects to another MD485 via the CABLE2TP conductor

4. Attach the barrel plug of the pn 15966 wall charger to the MD485’s Pwr port, then plug the wall charger into an AC outlet.

-L three

22-AWG cable

FIGURE 8-12. You can configure any two types of interface ports

(RS-485, RS-232, and CS I/O) to be used at a time

8.4 Sealing and Desiccating the Enclosure

Campbell Scientific enclosures include an Enclosure Supply Kit with the following items:

(4) Desiccant packs (1) Humidity indicator card (6) 4-inch cable ties (6) 8-inch cable ties (4) Cable tabs (1) 4 oz. sealing putty

Items in the Enclosure Supply Kit are used to strain relief the sensor leads, seal cable entry, and desiccate the enclosure (see FIGURE 8-13).

1. Secure the sensor leads to the left side of the enclosure and to the datalogger using cable ties and tabs.

2. Seal around the sensor leads where they enter the enclosure. Place a roll of putty around the sensor leads and press it around the leads and into the coupling to form a tight seal.

3. Remove the RH indicator card and two desiccant packs from the sealed plastic bag. Remove the backing from the indicator card and attach the card to the right interior wall of the enclosure.

The humidity indicator card has three colored circles that indicate the

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percentage of humidity. Desiccant packs inside the enclosure should be replaced with fresh packs when the upper dot on the indicator begins to turn pink. The indicator card does not need to be replaced unless the colored circles overrun.

FIGURE 8-13. Enclosure Supply Kit

8.5 Sensor Installation

Sensor leads should be routed down the North side of the mast to the enclosure and secured with cable ties.

8.5.1 034B Met One Windset

Mount the 034B to the CM202, CM204, or CM206 crossarm as shown in FIGURE 8-14.

1. Mount the CM220 bracket on the crossarm via the U-bolt and nuts.

2. Place the 034B stem and bushing into the CM220 bracket.

3. With the shoulder screw in place, orient the counter weight to point due south. See Section 8.5.18, Wind Direction Sensor Orientation, for final calibration.

4. Tighten the CM220’s U-bolt and nuts and remove the shoulder screw.

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FIGURE 8-14. Met One 034B Wind Speed and Direction Sensor

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8.5.2 05103, 05103-45, 05106, and 05305 RM Young Wind Monitors

Mount the Wind Monitor to the CM202, CM204, or CM206 crossarm as shown in FIGURE 8-15.

1. Attach the CM220 bracket on the crossarm via the U-bolt and nuts.

2. Position the top of the mounting post 5 inches above the CM220 and

tighten the set screws.

3. Slide the orientation ring and the Wind Monitor onto the mounting post.

Rotate the sensor base so that the square wiring box points south. Engage the key in the orientation ring with the keyway on the sensor and tighten the band clamps (see Section 8.5.18, Wind Direction Sensor Orientation, for final calibration).

4. Remove the plastic nut on the propeller shaft. Slide the propeller onto the

shaft (face the side with the lettering out) and replace the nut.

FIGURE 8-15. 05103 RM Young Wind Monitor

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8.5.3 03002 RM Young Wind Sentry Wind Set

The 03002 can be mounted directly to the mast, or to a crossarm.

8.5.3.1 03002 Mounted to the Mast

1. Slide the crossarm mounting bracket onto the mast. Orient the crossarm so the vane end points north, and tighten the band clamp (see Section 8.5.18, Wind Direction Sensor Orientation, for final calibration).

2. Attach the cup assembly to the anemometer shaft using the Allen wrench provided.

8.5.3.2 03002 Mounted to a CM200-Series Crossarm

Mount the 03001 to the crossarm as shown in FIGURE 8-16.

1. Attach the CM220 bracket on the crossarm via the U-bolt and nuts.

2. Position the top of the mounting post 5 inches above the CM220 bracket and tighten the set screws.

3. Slide the crossarm mounting bracket onto the mounting post. Orient the crossarm so the vane end points north, and tighten the band clamp (see Section 8.5.18, Wind Direction Sensor Orientation, for final calibration).

4. Attach the cup assembly to the anemometer shaft using the Allen wrench provided.

FIGURE 8-16. 03002 mounted to a CM200-series Crossarm

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Bullseye level

(3) Leveling Screws

(3) Mounting Screws

Sensor

CM225

8.5.4 Licor Silicon Radiation Sensors (LI200X, LI200S, LI190SB)

Mount the Radiation Sensor to the LI2003S Base and Leveling Fixture as shown in FIGURE 8-17.

1. Position the base of the sensor in the mounting flange on the LI2003S, and

tighten the set screw with the Allen wrench provided. Adjust the three leveling screws flush with the bottom of the LI2003S.

2. Mount the LI2003S to the CM225 (Section 7.2, Sensor Mounting

Brackets) using the three mounting screws provided. Do not tighten the screws at this time.

3. Level the LI2003S using the bubble level and leveling screws and tighten

the mounting screws. Remove the red protective cap prior to use.

FIGURE 8-17. LI200X/LI200S/LI190SB and LI2003S Leveling Fixture

8.5.5 107/108 Temperature Probe

Mount the 107 temperature probe inside the 41303-5A or UT6P 6-Plate Gill Radiation Shield as shown in FIGURE 8-18.

1. Loosen the two mounting clamp screws on the base of the radiation shield. Insert the 107 probe through the mounting clamp until the white heat shrink is even with the bottom of the clamp.

2. Tighten the two screws evenly until the clamp is snug against the sensor lead.

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FIGURE 8-18. 107 Temperature Probe

8.5.6 107/108 Soil Temperature Probe

1. Select an undisturbed area of ground on the side of the tower that will receive the least amount of traffic. Route the sensor lead from the datalogger to the selected area.

2. Dig a narrow trench next to the sensor lead, ending the trench at least 6 inches short of the probe tip. Lay the sensor lead into the trench.

3. Use a screwdriver to poke a horizontal hole into the undisturbed soil at the end of the trench at the appropriate measurement depth. Insert the probe tip into the hole and carefully backfill the trench.

4. If bare soil is required, a soil sterilant such as Paramitol can be applied to the area where the probe is buried. Soil erosion can be a problem when the probe is under bare soil. To prevent erosion from occurring, bury a 36inch square frame constructed from 2-inch x 4-inch lumber around the probe, with the top of the frame even with the soil surface.

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41303-5A

HMP60

8.5.7 HMP60 Vaisala Temperature and RH Probe

Mount the HMP60 probe inside the 41303-5A 6-Plate Gill Radiation shield as shown in FIGURE 8-19.

1. Loosen the two mounting clamp screws on the base of the radiation shield.

Insert the HMP60 sensor through the clamp until the base of the sensor is even with the bottom of the clamp.

Tighten the two screws evenly until the clamp is snug against the sensor base.

FIGURE 8-19. HMP60 Temperature and RH Probe

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41003-5

HC2S3

8.5.8 HC2S3 Rotronic Temperature and RH Probe

Mount the probe inside the 41003-5 Gill Radiation shield as shown in FIGURE 8-20.

1. Loosen the split plastic nut on the base of the shield. Insert the probe and tighten the nut.

FIGURE 8-20. HC2S3 Rotronic Temperature and RH Probe

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41005-5

HMP155A

8.5.9 HMP155A Vaisala Temperature and RH Probe

Mount the probe inside the 41005-5 14-Plate Gill Radiation shield as shown in FIGURE 8-21.

1. Loosen the split plastic nut on the base of the shield. Insert the probe and

tighten the nut.

FIGURE 8-21. HMP155A Vaisala Temperature and RH Probe

8.5.10 CS100 or CS106 Vaisala Barometric Pressure Sensor

Mount the barometer to the enclosure backplate.

1. Mount the barometer to the mounting plate using the two screws and

grommets provided.

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TE525

Hose Clamp

(2) Places

8.5.11 Texas Electronics Tipping Bucket Rain Gages (TE525, TE525WS, TE525MM)

1. Mount the rain gage to a vertical pipe as shown in FIGURE 8-22.

Mounting the gage directly to the tripod or tower is not recommended.

2. Dig a 6-inch diameter hole 24 inches deep.

3. Center a 1 1/4-inch to 2-inch IPS pipe in the hole and fill the hole with

concrete. Use a level to plumb the pipe as the hole is filled.

4. After the concrete has cured, attach the rain gage to the top of the pipe

with the hose clamps provided. Route the sensor lead to the tripod in plastic or metal conduit.

FIGURE 8-22. TE525 Texas Electronics Rain Gage

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8.5.12 TB4, TB4MM, or CS700 Rain Gage

The rain gage should be mounted in a relatively level spot that is representative of the surrounding area. The lip of the funnel should be horizontal and at least 30 inches above the ground. The ground surface around the rain gage should be natural vegetation or gravel. Often the rain gage is mounted to a CM300series pole. The pole can be embedded directly in a concrete pad. The CM300 pole can also be supported via J-bolts or legs.

1. Mount the rain gage to either the CM240 (FIGURE 8-23) or a user

supplied bracket. Remove the rain gage funnel from the base by removing the three screws and lifting upward. Adjust the three nuts on the CM240 bracket to level the rain gage. On user supplied brackets, shims or washers can be used to level the rain gage. A bubble level is mounted on the TB4, TB4MM, or CS700 base to facilitate leveling.

2. Remove the rubber shipping band and cardboard packing securing the

tipping bucket assembly. Tip the bucket several times to insure the tipping mechanism is moving freely.

3. Replace the housing assembly and tighten the three screws to secure the

housing to the base.

FIGURE 8-23. TB4 or TB4MM mounted onto a CM310 pole via the

CM240 mount

8.5.13 SR50A Sonic Ranging Sensor

( )

CONE

0.=

CONE

heightradius

268

8.5.13.1 Beam Angle

When mounting the SR50A, the sensor’s beam angle needs to be considered (see FIGURE 8-24). It is always best to mount the SR50A perpendicular to the intended target surface. The SR50A has a beam angle of approximately 30 degrees. This means that objects outside this 30 degree beam will not be detected nor interfere with the intended target. Any unwanted target must be outside the 30 degree beam angle.

The following formula is used to determine the required clearance for the beam angle. By inserting a height value in the Formula, a Clearance Radius in the same measurement units as the height can be obtained.

FORMULA 2. Beam angle clearance Radius

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Clearance Radius formula:

FIGURE 8-24. Beam angle clearance

8.5.13.2 Mounting Height

Any target to the SR50A should be at least 50 cm or more from the face of the transducer. An attempt should also be made to not mount the sensor too far from the target surface. The further the sensor is from the target the more the absolute error increases. If your application is measuring snow depth in an area that will likely not exceed 1.25 meters of snow then a good height to mount the sensor would be 1.75 to 2.0 meters. Mounting the sensor 4 meters above the ground will result in the potential for larger snow depth errors.

8.5.13.2.1 Reference Point

The front grill on the ultrasonic transducer is used for the reference for the distance values. Because it is difficult to measure from the grill one can use the outer edge of the plastic transducer housing see FIGURE 8-25. If this edge is used, simply add 8 mm to the measured distance.

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FIGURE 8-25. Distance from edge of transducer housing to grill

8.5.13.3 Mounting Options

There are two standard mounting options available for the SR50A sensor.

The first is the SR50A Mounting Kit, pn 19517. This bracket is used to mount the SR50A to a CM206 crossarm or a pipe with a 1-inch to 1.75-inch OD.

FIGURE 8-26 and FIGURE 8-27 show a couple of angles of the SR50A mounted to a crossarm. A U-bolt attaches the bracket to the crossarm and two screws attach the SR50A to the bracket.

Another mounting option shown in FIGURE 8-28 utilizes a mounting stem (pn

19484) and a NU-RAIL. The mounting stem is sized to fit a 1-inch NU-RAIL (pn 1049). This mounting method was used for the SR50 (predecessor to the SR50A ) and the stem can be used to fit the SR50A into existing SR50 mounts.

FIGURE 8-26. SR50A mounted to a crossarm via the 19517 Mounting

Kit

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FIGURE 8-27. The SR50A mounted to the crossarm

shown from another angle

FIGURE 8-28. SR50A - mounted using NU-RAIL and C2151 mounting

stem

SR50A with 6-plate gill radiation shield – the picture below shows the

SR50A stem attachment

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8.5.14 CS616 Water Content Reflectometer

Probe rods can be inserted vertically or horizontally into the soil surface or buried at any orientation to the surface. A probe inserted vertically into a soil surface will give an indication of the water content in the upper 30 cm of soil. Horizontal installation will detect the passing of wetting fronts. Insertion at a 30 degree angle with the surface will measure water content in the upper 15 cm of soil.

Probes must be inserted such that no air voids are created around the rods, and that the rods remain as parallel as possible. Use the CS650G Rod Insertion Guide with Pilot Rod to minimize errors due to improper insertion (see FIGURE 8-29).

The standard calibration for the CS616 probe, as programmed in Short Cut, is valid for loamy soils with low organic content. In other types of soils, reporting the output in units of period will make it possible to apply your own calibration during post processing of data.

FIGURE 8-29. CS650G Insertion Guide Tool

8.5.15 237 Leaf Wetness Sensor

Mounting and orientation considerations are left to the user to determine. Consult the 237 manual for preparation and other information. Normally, the sensor is mounted away from the meteorological tower in or near a plant canopy.

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FIGURE 8-30. 237 Leaf Wetness Sensor

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8.5.16 257 Soil Moisture Sensor

1. Soak the sensor end of the 257 in irrigation water for 12 to 14 hours.

Allow the sensor to dry for 1 to 2 days after soaking and repeat the soak/dry cycle twice to improve sensor response. Always install a wet sensor.

2. Install the sensor into soil representative of the field conditions you wish

to monitor. Avoid high or low spots. Placement south of the weather station mast (northern hemisphere) will avoid the effects of the mast shade. Installation in the root zone is best if measurements are used for irrigation purposes.

3. The 257 should be removed from the soil prior to harvest or cultivation

operations to avoid damaging the sensor or sensor cable. Remove when soil is moist.

FIGURE 8-31. 257 Soil Moisture Sensor

8.5.17 Enclosure Humidity Sensor

NOTE

Mount the CS210 inside the environmental enclosure or onto a datalogger using the mounting block and the wire tie included with the sensor (FIGURE 8-32).

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.

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FIGURE 8-32. CS210 installed on a CR1000

8.5.18 Wind Direction Sensor Orientation

8.5.18.1 Determining True North and Sensor Orientation

Orientation of the wind direction sensor is done after the datalogger has been programmed, and the location of True North has been determined. True North is usually found by reading a magnetic compass and applying the correction for magnetic declination*; where magnetic declination is the number of degrees between True North and Magnetic North. Magnetic declination for a specific site can be obtained from a USFA map, local airport, or through the National Geophysical Data Web site at: www.ngdc.noaa.gov/geomag. A general map showing magnetic declination for the contiguous United States is shown in FIGURE 8-33.

Declination angles east of True North are considered negative, and are subtracted from 360 degrees to get True North as shown FIGURE 8-34. Declination angles west of True North are considered positive, and are added to 0 degrees to get True North as shown in FIGURE 8-35. For example, the declination for Logan, Utah is 16° East. True North is 360° – 16°, or 344° as read on a compass.

Orientation is most easily done with two people, one to aim and adjust the sensor, while the other observes the wind direction displayed by the datalogger.

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1. Establish a reference point on the horizon for True North.

2. Sighting down the instrument center line, aim the nose cone, or counterweight at True North. Display the input location for wind direction using the *6 Mode of the datalogger, or, the Monitor Mode of LoggerNet with an on-line PC.

3. Loosen the band clamps or set screws that secure the base of the sensor to the mast or crossarm. While holding the vane position, slowly rotate the sensor base until the datalogger indicates 0 degrees. Tighten the band clamps or set screws loosened previously.

4. Engage the orientation ring indexing pin in the notch at the instrument base (05103, 05106, and 05305 sensors only), and tighten the band clamp on the orientation ring.

* Other methods employ observations using the North Star or the sun, and

are discussed in the Quality Assurance Handbook for Air Pollution Measurement Systems, Volume IV - Meteorological Measurements

Subtract declination from 360° Add declination to 0°

FIGURE 8-33. Magnetic declination for the contiguous United States

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8.5.18.2 National Geophysical Data Center Web Site

This web site facilitates the task of determining magnetic declination for your weather station. The web site uses longitude and latitude to determine declination. Customers located in the US can find their site’s longitude and latitude. For international customers, a link is provided to help them determine their longitude and latitude.

FIGURE 8-34. Declination angles east of True North are

subtracted from 360 to get True North

FIGURE 8-35. Declination angles west of True North are

added to 0 to get True North

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9. Maintenance and Troubleshooting

These guidelines apply to several different Campbell Scientific weather stations.

9.1 Maintenance

Proper maintenance of weather station components is essential to obtain accurate data. Equipment must be in good operating condition, which requires a program of regular inspection and maintenance. Routine and simple maintenance can be accomplished by the person in charge of the weather station. More difficult maintenance such as sensor calibration, sensor performance testing (i.e., bearing torque), and sensor component replacement, generally requires a skilled technician, or that the instrument be sent to Campbell Scientific or the manufacturer.

A station log should be maintained for each weather station that includes serial numbers, dates that the site was visited, and maintenance that was performed.

9.1.1 Instrumentation Maintenance

The instrumentation requires a minimum of routine maintenance. A few preventative maintenance steps will optimize battery life and decrease the chances of datalogger failure.

9.1.2 Batteries

9.1.3 Desiccant

The CRBasic Battery instruction can be used to measure the CR1000’s battery voltage. By recording battery voltage the user can determine how long a fresh set of batteries will last (see the Installation Section of the datalogger Operator’s Manual for cold temperature effects on alkaline batteries). Short Cut automatically program the weather station to measure battery voltage.

When alkaline batteries are used, the battery voltage should not be allowed to drop below 9.6 Vdc before replacement. Where CR10 or 21X dataloggers are used in the instrumentation, an external battery must be used to maintain power to the datalogger when changing batteries, otherwise the clock, program, and data will be lost (refer to the Installation Section of the datalogger’s Operator’s Manual for details). When not in use, remove the eight cells to eliminate potential corrosion of the contact points, and store in a cool dry place.

Rechargeable power supplies should be connected to an AC transformer or unregulated solar panel at all times. The charge indicating diode should be “ON” when voltage to the charging circuitry is present. Be aware of battery voltage that consistently decreases over time, which indicates a failure in the charging circuitry.

In standard weather stations, a humidity indicator card is provided with the enclosure. A small RH sensor (pn 10162) can be purchased separately to record the RH inside the enclosure. Change the desiccant when either the card or the sensor read about 35% RH.

Desiccant may be ordered through Campbell Scientific (DSC 20/4).

Desiccant packs inside of the dataloggers do not require replacement under normal conditions.

9.1.4 Sensor Maintenance

Sensor maintenance should be performed at regular intervals, depending on the desired accuracy and the conditions of use. A suggested maintenance schedule is outlined below.

1 week

• Check the pyranometer for level and contamination. Gently clean, if

needed.

• Visually inspect the wind sensors and radiation shield.

1 month

• Check the rain gage funnel for debris and level.

• Do a visual/audio inspection of the anemometer at low wind speeds.

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• Check the filter of the temperature/humidity sensor for contamination.

General Maintenance

• An occasional cleaning of the glass on the solar panel will improve its

efficiency.

• Check sensor leads and cables for cracking, deterioration, proper routing,

and strain relief.

• Check the tripod or tower for structural damage, proper alignment, and for

level/plumb.

6 months

• Clean the temperature/humidity sensor.

• Clean the Gill Radiation Shield.

1 year

• Replace anemometer bearings.

• Calibrate the rain gage.

• Calibrate the HMP45C probe.

• Check calibration of HMP50 RH Probe; replace RH chip if necessary.

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2 years

• Calibrate the solar radiation sensors (some users suggest yearly).

• Calibrate the temperature sensor.

• Replace the wind vane potentiometer and bearings.

4 to 5 years

• Replace sensor cables as required.

9.2 Troubleshooting

9.2.1 No Response Using the Keypad

Check keypad response after each of the following steps.

A. Make sure the battery has been installed, and the power switch, if any, is

“ON”.

B. Use a voltmeter to measure the voltage on the 12 V and G terminals; the

voltage must be between 9.6 and 16 Vdc.

C. Disconnect any sensor or peripheral wires connected to the 5 V and 12 V

terminals.

D. Disconnect any communications or storage peripherals from the

datalogger.

E. Reset the datalogger by turning the power switch to “OFF”, then to “ON”

or disconnecting and reconnecting the battery.

F. If still no response, call Campbell Scientific.

9.2.2 No Response from Datalogger through SC32B or Modem Peripheral

At the datalogger:

A. Make sure the battery has been installed, and the power switch, if any, is

“ON”.

B. Use a voltmeter to measure the voltage on the 12 V and G terminals; the

voltage must be between 9.6 and 16 Vdc.

C. Make sure the datalogger is connected to the modem, and the modem is

properly configured and cabled (Section 8.3, Communication and Data Storage Peripherals).

At the computer:

D. Make sure the Station File is configured correctly (LoggerNet or PC400

Manual).

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25-pin serial port:

computer end

modem end

2 2 3

9-pin serial port:

computer end

modem end

E. Check the cable(s) between the serial port and the modem. If cables have

not been purchased through Campbell Scientific, check for the following configuration using an ohm meter:

F. Make sure the modem is properly configured and cabled (Section 8.3,

Communication and Data Storage Peripherals).

G. If still no response, call Campbell Scientific.

9.2.3 NaN Displayed in a Variable

A. Make sure the battery voltage is between 9.6 and 16 Vdc.

B. Verify the sensor is wired to the analog channel specified in the

measurement instruction or Short Cut .FSL file.

C. Make sure the Range parameter in the measurement instruction covers the

full scale voltage output by the sensor.

9.2.4 Unreasonable Results Displayed in a Variable

A. Inspect the sensor for damage and/or contamination.

B. Make sure the sensor is properly wired to the datalogger.

C. Check the multiplier and offset parameters in the measurement

instruction.

10. Standard Software Installation

Software required for a weather station consists of the datalogger program and a datalogger support software suite for Windows.

10.1 Datalogger Program

The datalogger program operates the weather station. It programs the datalogger to measure sensors, process the measurements, and store data in the datalogger’s memory. The datalogger program is most easily created using Short Cut. A separate manual covers the use of Short Cut in detail.

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10.2 Weather Station or Datalogger Support Suite

Use of VisualWeather, PC400, or LoggerNet enables interfacing with the weather station through Windows. Follow the installation procedure outlined in the front of the software manual. These software packages download programs to the weather station datalogger, monitor data, and retrieve data stored in the datalogger.

10.3 Quick Start Review

Follow these steps to program the weather station datalogger and install the support software suite.

1. Install VisualWeather, PC400, or LoggerNet into your computer as outlined in their respective manuals.

2. Click the VisualWeather, PC400, or LoggerNet icon.

3. Create a program using Short Cut, which is included in VisualWeather, PC400, and LoggerNet.

4. Print the wiring diagram produced by Short Cut and follow the wiring assignments when connecting sensors to the weather station datalogger.

5. Use the EZ Setup Wizard in VisualWeather, PC400, or LoggerNet to set up the weather station.

Appendix A. RFM18 Base Dimensions

Dimensions of the RFM18 Base and spacing of the mounting holes are shown in the drawing below.

A-1

Appendix A. RFM18 Base Dimensions

A-2

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 8108

Garbutt Post Shop QLD 4814

AUSTRALIA

www.campbellsci.com.au • info@campbellsci.com.au

Campbell Scientific (Beijing) Co., Ltd.

8B16, Floor 8 Tower B, Hanwei Plaza

7 Guanghua Road

Chaoyang, Beijing 100004

P.R. CHINA

www.campbellsci.com • info@campbellsci.com.cn

Campbell Scientific do Brasil Ltda. (CSB)

Rua Apinagés, nbr. 2018 ─ Perdizes

CEP: 01258-00 ─ São Paulo ─ SP

BRASIL

www.campbellsci.com.br • vendas@campbellsci.com.br

Campbell Scientific Canada Corp. (CSC)

14532 – 131 Avenue NW

Edmonton AB T5L 4X4

CANADA

www.campbellsci.ca • dataloggers@campbellsci.ca

Please visit www.campbellsci.com to obtain contact information for your local US or international representative.

Campbell Scientific Centro Caribe S.A. (CSCC)

300 N Cementerio, Edificio Breller

Santo Domingo, Heredia 40305

COSTA RICA

www.campbellsci.cc • info@campbellsci.cc

Campbell Scientific Ltd. (CSL)

Campbell Park

80 Hathern Road

Shepshed, Loughborough LE12 9GX

UNITED KINGDOM

www.campbellsci.co.uk • sales@campbellsci.co.uk

Campbell Scientific Ltd. (CSL France)

3 Avenue de la Division Leclerc

92160 ANTONY

FRANCE

www.campbellsci.fr • info@campbellsci.fr

Campbell Scientific Ltd. (CSL Germany)

Fahrenheitstraße 13

28359 Bremen

GERMANY

www.campbellsci.de • info@campbellsci.de

Campbell Scientific Spain, S. L. (CSL Spain)

Avda. Pompeu Fabra 7-9, local 1

08024 Barcelona

SPAIN

www.campbellsci.es • info@campbellsci.es

Campbell Scientific UT20, UT30 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Limited Warranty

Assistance

Precautions

Table of Contents

1. Introduction

2. Cautionary Statements

2.1 Site Selection

2.2 Tower Mounting

2.3 Tower Installation

3. Initial Inspection

3.1 Indoors

3.2 Outdoors

3.3 Tools Required

3.3.1 Tools for Tower Installation

3.3.2 Tools for Instrumentation and Maintenance

3.3.3 Supplies for Power and Communications Options

4. Siting and Exposure

4.1 Wind Speed and Direction

4.2 Temperature and Relative Humidity

4.3 Precipitation

4.4 Solar Radiation

4.5 Soil Temperature

4.6 Siting References

5. Overview

6. Specifications

7. UT20/UT30 Tower Installation

7.1 Installing the UT20/UT30

7.1.1 Base and Guy Anchor Layout

7.1.2 Tower Base Installation

7.1.2.1 B18 Base Installation

7.1.2.2 RFM18 Base Installation

7.1.3 Guy Anchor Installation

7.1.3.1 UTEYE Eyebolt Guy Anchor

7.1.3.2 UTDUK Duckbill Guy Anchor

7.1.4 Tower Assembly

7.1.5 UTGND Tower Grounding Kit

7.2 Sensor Mounting Brackets

7.2.1 CM202, COM202SS, CM203, CM204, CM204SS, or CM206

7.2.2 Gill Radiation Shields

7.2.2.1 41303-5A, 41003-5, 41005-5

7.2.3 Solar Radiation Mounts

7.2.3.1 CM225 Solar Radiation Stand

8. Preparing the Tower for Use

8.1 Enclosure, Datalogger, Power Supply

8.1.1 Enclosure

8.1.2 CR1000 Datalogger

8.1.3 BPALK Alkaline Power Supply

8.1.4 PS100 Rechargeable Power Supply

8.1.5 SP10 Solar Panel

8.2 Sensor Connection

8.3 Communication and Data Storage Peripherals

8.3.1 CFM100, NL115, or NL120

8.3.2 COM220 Phone Modems

8.3.3 Cellular Transceivers

8.3.4 SRM-5A Rad Modem and SC932A Interface

8.3.4.1 SRM-5A at the Datalogger

8.3.4.2 SRM-5A at the Computer

8.3.5 RF500M RF Modem and RF310-Series Transceivers

8.3.5.1 RF500M Modem Configuration

8.3.5.2 RF500M RF Base Station

8.3.5.3 Install Nearest Repeater/Field Station

8.3.6 MD485 Multidrop Interface

8.3.6.1 MD485 Multidrop Interface at the Datalogger

8.3.6.2 MD485 Multidrop Interface at the Computer

8.4 Sealing and Desiccating the Enclosure

8.5 Sensor Installation

8.5.1 034B Met One Windset

8.5.2 05103, 05103-45, 05106, and 05305 RM Young Wind Monitors

8.5.3 03002 RM Young Wind Sentry Wind Set

8.5.3.1 03002 Mounted to the Mast

8.5.3.2 03002 Mounted to a CM200-Series Crossarm

8.5.4 Licor Silicon Radiation Sensors (LI200X, LI200S, LI190SB)

8.5.5 107/108 Temperature Probe

8.5.6 107/108 Soil Temperature Probe

8.5.7 HMP60 Vaisala Temperature and RH Probe

8.5.8 HC2S3 Rotronic Temperature and RH Probe