Campbell T107 User manual

T107 Weather Station
Revision: 5/12
Copyright © 1993-2012
Campbell Scientific, Inc.

Warranty
“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless otherwise specified in the corresponding
Campbell pricelist or product manual. Products not manufactured, but that are
re-sold by Campbell, are warranted only to the limits extended by the original
manufacturer. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell's obligation under this warranty is
limited to repairing or replacing (at Campbell's option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
carrier prepaid within the continental United States of America. To all other
locations, Campbell will return such products best way CIP (Port of Entry)
INCOTERM® 2010, prepaid. This warranty shall not apply to any products
which have been subjected to modification, misuse, neglect, improper service,
accidents of nature, or shipping damage. This warranty is in lieu of all other
warranties, expressed or implied. The warranty for installation services
performed by Campbell such as programming to customer specifications,
electrical connections to products manufactured by Campbell, and product
specific training, is part of Campbell’s product warranty. CAMPBELL
EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,
incidental, and/or consequential damages.”

Assistance
Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone [phone]. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a "Statement of Product Cleanliness
and Decontamination" form and comply with the requirements specified in it.
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completed form must be either emailed to [e-mail] or faxed to
[phone]. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
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.

T107 Weather Station
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Preparation and Siting .............................................1-1
1.1 Siting and Exposure.............................................................................. 1-1
1.1.1 Wind Speed and Direction .......................................................... 1-1
1.1.2 Temperature and Relative Humidity........................................... 1-2
1.1.3 Solar Radiation............................................................................ 1-2
1.2 Installation Tasks .................................................................................. 1-2
1.2.1 Indoors ........................................................................................ 1-2
1.2.2 Outdoors...................................................................................... 1-5
1.3 Tools Required ..................................................................................... 1-5
1.3.1 Tools for Pole Installation........................................................... 1-5
1.3.2 Tools for Instrumentation and Maintenance ............................... 1-6
1.4 Supplies for Power and Communications Options ............................... 1-6
1.5 Determining True North for Wind Vane Orientation ........................... 1-7
1.5.1 Web Calculator ........................................................................... 1-8
2. Hardware Installation ...............................................2-1
2.1 Base Foundation ................................................................................... 2-2
2.1.1 Supplied Components ................................................................. 2-2
2.1.2 Installation .................................................................................. 2-2
2.1.3 AC Power Installation................................................................. 2-4
2.2 Tower/Pole............................................................................................ 2-4
2.2.1 Supplied Components ................................................................. 2-4
2.2.2 Installation .................................................................................. 2-4
2.2.3 Tower Grounding........................................................................ 2-7
2.2.3.1 Supplied Components ....................................................... 2-7
2.2.3.2 Grounding Procedure ........................................................ 2-7
2.3 Enclosure .............................................................................................. 2-8
2.3.1 Enclosure Installation.................................................................. 2-8
2.4 Crossarm and Sensor Installation ......................................................... 2-9
2.4.1 Components ................................................................................ 2-9
2.4.2 Crossarm Installation .................................................................. 2-9
2.4.3 RH and Temperature Radiation Shield ..................................... 2-11
2.4.4 034B Wind Sensor (Wind Sensor Option –MW) ..................... 2-12
2.4.5 Gill WindSonic 2-D Ultrasonic Wind Sensor (Wind Sensor
Option –GW) .......................................................................... 2-14
2.4.5.1 Changing the Jumper....................................................... 2-14
2.4.5.2 Attachment to Sensor Arm.............................................. 2-16
2.4.6 Rain Gage ................................................................................. 2-18
2.4.7 Pyranometer .............................................................................. 2-19
2.4.8 Sensor Connections................................................................... 2-20
2.4.9 Sensor Verification and Clock Set ............................................ 2-22
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T107 Weather Station Table of Contents
2.5 Communication Peripherals................................................................ 2-22
2.5.1 Direct Connect to T107 Station................................................. 2-22
2.5.2 Phone Modem ........................................................................... 2-24
2.5.2.1 Internal Installation.......................................................... 2-24
2.5.2.2 External Installation......................................................... 2-25
2.5.3 Short-Haul Modem.................................................................... 2-25
2.5.3.1 Internal Installation.......................................................... 2-26
2.5.3.2 External Installation......................................................... 2-27
2.5.4 RF450 900 MHz, 1 Watt Spread Spectrum Radio .................... 2-28
2.5.4.1 Power Considerations ...................................................... 2-29
2.5.4.2 Default Configuration...................................................... 2-29
2.5.4.3 Internal Installation.......................................................... 2-30
2.5.4.4 External Installation......................................................... 2-31
2.5.4.5 Base Radio Installation .................................................... 2-37
2.6 Lightning Rod Installation .................................................................. 2-39
2.7 Solar Panel Installation ....................................................................... 2-41
2.8 Battery Installation.............................................................................. 2-43
2.9 Restraining Cables and Sealing/Desiccating Enclosure...................... 2-44
2.9.1 Restraining Cables..................................................................... 2-44
2.9.2 Sealing and Desiccating the Enclosure .....................................2-45
3. ET Software .............................................................. 3-1
4. Maintenance, Troubleshooting, and Schematics.. 4-1
4.1 Maintenance.......................................................................................... 4-1
4.1.1 Pole.............................................................................................. 4-1
4.1.2 Power Supply .............................................................................. 4-1
4.1.2.1 Batteries ............................................................................. 4-1
4.1.2.2 Solar Panel......................................................................... 4-1
4.1.3 Desiccant ..................................................................................... 4-1
4.1.4 Sensor Maintenance .................................................................... 4-2
4.1.4.1 Procedure for Removing RH Chip .................................... 4-4
4.1.5 CR1000M Module ...................................................................... 4-5
4.2 Troubleshooting .................................................................................... 4-6
4.2.1 No Response Using the CR1000KD Keypad.............................. 4-6
4.2.2 No Response from Datalogger through SC32B, RAD Modem,
or Phone Modem....................................................................... 4-6
4.2.3 NAN or ±INF Displayed in a Variable .......................................4-7
4.2.4 Unreasonable Results Displayed in a Variable ........................... 4-7
4.2.5 NAN or ±INF Stored in a Data Table ......................................... 4-8
4.2.6 Communication Problems when using an RF450 Radio............. 4-8
4.2.7 Gill WindSonic1-ET Diagnostic Diagnostic Codes .................. 4-10
4.3 Schematics of Connectors................................................................... 4-11
4.3.1 Sensor Schematics..................................................................... 4-12
4.3.2 Power Schematics ..................................................................... 4-17
4.3.3 Communication Modems Schematics ....................................... 4-17
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T107 Weather Station Table of Contents
Appendices
A. T107 Maintenance Log............................................ A-1
B. PS24 24 Ahr Power Supply and 10 x 12 inch
Enclosure............................................................ B-1
B.1 PS24 Components................................................................................B-1
B.2 Installation............................................................................................B-4
C. Exploded Views....................................................... C-1
C.1 Enclosure..............................................................................................C-1
C.2 Crossarm ..............................................................................................C-2
D. Default Programs .................................................... D-1
D.1 Program for T107 with 034B.............................................................. D-1
D.2 Program for T107 with Gill WindSonic ............................................. D-5
E. Step-down Transformer Installation...................... E-1
Figures
1.1-1. Effect of Structure on Wind Flow .................................................... 1-1
1.2-1A. Cut Flap Packing Tape .................................................................. 1-3
1.2-1B. Shipping Box Packaging ............................................................... 1-3
1.2-2. T107 with the Met One 034B-ETM Wind Sensor, Top Layer......... 1-4
1.2-3. T107, Bottom Layer ......................................................................... 1-4
1.5-1. Magnetic Declination for the Contiguous United States .................. 1-7
1.5-2. Declination Angles East of True North Are
Subtracted From 0 to Get True North........................................... 1-8
1.5-3. Declination Angles West of True North Are
Added to 0 to Get True North....................................................... 1-8
2.1-1. ET tower installation with currently-available AC power option .... 2-1
2.1-2. ET Tower Base Installation .............................................................. 2-3
2.1-3. Cut-Away View Shows Anchor Bolt and Conduit Placement in
Cement Pad................................................................................... 2-3
2.2-1. Transparent View Shows Raising and Grounding the ET Tower .... 2-6
2.2-2. Close up of Ground Rod and 4 AWG Cable .................................... 2-6
2.3-1. T107 Instrumentation Mounted on the ET Tower............................ 2-8
2.3-2. Enclosure Spacing Above Pole ........................................................ 2-9
2.4-1. T107 Sensor Arm Mounting........................................................... 2-10
2.4-2. Temperature/Relative Humidity Sensor with Yellow
Protective Cap .............................................................................. 2-1
2.4-3. Temperature/Relative Humidity Sensor without Yellow
Protective Cap ............................................................................ 2-12
2.4-4. Wind and RH/Temperature Sensor Installation ............................. 2-13
2.4-5. 034B Mounting to Pipe .................................................................. 2-13
2.4-6. Screws that Secure the Electronics Cover ...................................... 2-15
2.4-7. Removal of the Electronics Cover.................................................. 2-15
2.4-8. Jumper Set for WindSonic1 ........................................................... 2-16
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T107 Weather Station Table of Contents
2.4-9. Gill WindSonic Mounting Shaft..................................................... 2-17
2.4-10. Gill WindSonic Connected to Cable.............................................. 2-17
2.4-11. Remove Rubber Band from Tipping Mechanism......................... 2-18
2.4-12. Pyranometer Leveling................................................................... 2-19
2.4-13. Remove Red or Green Pyranometer Cap...................................... 2-19
2.4-14. Position of Sensor Bulkhead Connectors ..................................... 2-20
2.4-15. Connecting Sensor Cabling to Enclosure ..................................... 2-21
2.5-1. Close-up of the terminals and 9-pin ports in the T107 (battery
not shown). ................................................................................. 2-23
2.5-2. Phone Modem Mounting and Connections (battery not shown) .... 2-24
2.5-3. Short-Haul Modem Mounting and Connection .............................. 2-26
2.5-4. Short-Haul Modem Wiring Diagram.............................................. 2-28
2.5-5. RF450 in T107 (battery not shown) ............................................... 2-30
2.5-6. Attach Ribbon Cable to RF450 CS I/O Port................................... 2-31
2.5-7. Loosely Wire Tie Antenna Cable ................................................... 2-32
2.5-8. Loosely Drape Antenna Cable over Back of Enclosure ................. 2-32
2.5-9. Slide Antenna Bracket U-Bolt around Back of the Pole ................ 2-33
2.5-10. Antenna Bracket Mounted to Pole................................................ 2-34
2.5-11. Mount Antenna Saddle Bracket.................................................... 2-34
2.5-12. Yagi Antenna Mounted to Saddle Bracket ................................... 2-35
2.5-13. Wire Tie Antenna Cable to Yagi Antenna and to Pole................. 2-36
2.5-14. Wire Tie Locations for Omni Antenna Installation ...................... 2-37
2.5-15. Base RF450 Installation................................................................ 2-38
2.5-16. A Base Radio Installed in an Office ............................................. 2-38
2.6-1. Lightning Rod Bracket Installation ................................................ 2-39
2.6-2. Grounding to Lightning Rod Clamp............................................... 2-40
2.7-1. Solar Panel Mounting and Cabling................................................. 2-41
2.7-2. Side View of Solar Panel Shows Tilt Angle................................... 2-42
2.8-1. PS100 Battery Installation .............................................................. 2-43
2.8-2. PS100 to T107 Enclosure Wiring................................................... 2-43
2.9-1. Cabling Strapped to Wire Tie Harness ........................................... 2-44
2.9-2. Connector Cover in Place ............................................................... 2-45
2.9-3. Desiccant Installation...................................................................... 2-46
4.1-1. Exploded View of HMP50-ET (as shipped)..................................... 4-3
4.2-1. RF450 Front Side View.................................................................... 4-8
4.3-1. Schematic of HMP50-ET RH and Temperature Probe and
Connector Temp/RH................................................................... 4-12
4.3-2. Schematic of 034B-LC Wind Speed and Direction Probe and
Connector WS/WD..................................................................... 4-13
4.3-4. Schematic of CS305-ET Solar Radiation Sensor and
Connector Solar Radiation.......................................................... 4-14
4.3-5. Schematic of TE525-ET Rain Sensor and Connector
Rain (Precip)............................................................................... 4-15
4.3-6. Schematic of 107-LC or 108-LC Temperature Probe or
CS616-LC Soil Volumetric Water Content Sensor and
Connector Temp/CS616 ............................................................. 4-16
4.3-7. Schematic of Connector SDI-12..................................................... 4-16
4.3-8. Schematic of Solar Panel and Connector Power ............................4-17
4.3-9. Schematic of Short Haul or Phone Modem and Connector
COMM........................................................................................ 4-17
B.1-1. Environmental Enclosure with CH100, Power Cable, and
Battery Bracket ............................................................................ B-1
B.1-2. 24 Ahr Battery and Battery Cable................................................... B-2
B.1-3. Enclosure Supply Kit ...................................................................... B-3
B.2-1. Strut Clamps in Brackets................................................................. B-4
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T107 Weather Station Table of Contents
B.2-2. Both Strut Clamps and Brackets on T107 Pole ...............................B-5
B.2-3. Top Clamp Hook Side Up ...............................................................B-6
B.2-4. Enclosure Mounted on T107 Pole ...................................................B-7
B.2-5. Enclosure Locking Mechanism .......................................................B-8
B.2-6. Mounted Solar Panel........................................................................B-9
B.2-7. Procedure for installing and connecting battery ............................B-11
E-1. ET tower installation with step-down transformer..............................E-1
Tables
4.1-1. CR1000 Lithium Battery Specifications........................................... 4-5
4.2-1. Multi-Point Network LED Status..................................................... 4-9
4.2-2. Gill WindSonic Diagnostic Codes ................................................. 4-11
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T107 Weather Station Table of Contents
vi

Section 1. Preparation and Siting
1.1 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.
CAUTION
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)1, WMO (1983)2, and AASC (1985)3publications.
1.1.1 Wind Speed and Direction
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 1.1-1.
H
10H
10T
Height of tree (T)
Logan,Utah MADE IN USA
FIGURE 1.1-1. Effect of Structure on Wind Flow
1-1

Section 1. Preparation and Siting
1.1.2 Temperature and Relative Humidity
Sensors should be located over an open level area at least 9 m (29.5 ft) (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
(98.43 ft) (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
1.1.3 Solar Radiation
Pyranometers should be located to avoid shadows on the sensor at any time.
Mounting it on the southern most (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.
1.2 Installation Tasks
1.2.1 Indoors
•Immediately upon receipt of your shipment…
⇒Weather station is packed in the shipping box in layers. See Figures
1.2-1A, 1.2-1B, 1.2-2, and 1.2-3.
⇒Immediately upon receipt of your shipment…
Open shipping carton(s).
Set the large weather station carton down lengthwise on a floor or
table top. Position the box as shown in Figure 1.2-1A.
Cut the tape along the edge of the lower flap first. See Figure 1.2-
1A.
Cut the tape around the remaining flaps BUT only cut one layer deep.
Lift up the cardboard flaps exposing the top layer of foam as shown
in Figure 1.2-1B.
⇒Check contents against invoice and shipping checklist. Contact
Campbell Scientific immediately about any shortages.
1-2

Section 1. Preparation and Siting
THIS SIDE UP
Cut Lower Flap
Edge First FIGURE 1.2-1A. Cut Flap Packing Tape
Top Packing
Foam Layer
Middle Packing
Foam Layer T107,
Top Layer
T107,
Bottom Layer
Bottom Packing
Foam Layer
FIGURE 1.2-1B. Shipping Box Packaging
1-3

Section 1. Preparation and Siting
Top Layer
Instruction
Manual
Cardboard
Manual
WindVane
Crossarm with Rain, Solar, and
Temp/%RH Sensors
Enclosure
Wind Set
FIGURE 1.2-2. T107 with the Met One 034B-ETM Wind Sensor, Top
Layer
301-T
Bottom Layer
BATTERY
DESI PAK
FIGURE 1.2-3. T107, Bottom Layer
Mounting Template Grounding Wire
and Enclosure Desiccant Packs
2-Piece Pole Grounding and
Lightning Rod
AC Transformer
and Cabling
Instruction
Manual
Cardboard
Containing Wind Vane
Mounting Bolts
and Hardware
Enclosure
Battery
PVC Swept
Elbow Conduit
Communication
Option Cabling
Temp/%RH
Gill Radiation
Shield
1-4

Section 1. Preparation and Siting
⇒Securely tape box shut if transporting entire station to another site. If
at the main site, remove any communication components that are
installed at the calling computer. Repackage remaining components
for transport to field site.
Solar panel and RF items (if any) will be packed in a separate box.
•Several days prior to the planned installation date…
⇒Collect tools and site information (Section 1)
⇒Install datalogger support software (Section 3)
1.2.2 Outdoors
•Locate suitable site (Section 1)
•Prepare concrete base (Section 2)
•T107 Installation:
⇒Place instrumentation enclosure on the ET pole. Slide enclosure to the
top of the pole and secure with correct orientation (Section 2.3).
1.3 Tools Required
Tools required to install and maintain a weather station are listed below.
1.3.1 Tools for Pole Installation
ET Pole
Shovel
Rake
Open end wrenches: 3/8", 7/16", 1/2", (2) 9/16"
Magnetic compass
6' Step ladder
Tape measure (12’ to 20’)
Claw hammer
Level (24” to 36”)
Hand saw
Materials for concrete form:
(4) 1" x 2" x 12" stakes
(2) 2" x 4" x 96" lumber
(12) 8p double-head nails
(8) 16p double-head nails
20 ft form wire
½ Yard concrete
Concrete trowel, edger
Electrical Fish tape or 20 feet of small diameter rope
Wheelbarrow
1-5

Section 1. Preparation and Siting
1.3.2 Tools for Instrumentation and Maintenance
ET Pole
Lock and key for enclosure
Magnetic declination angle
Magnetic compass
Straight bit screwdrivers (small, medium, large)
Phillips-head screwdrivers (small, medium)
Small diagonal side-cutters
Needle-nose pliers
Wire strippers
Pocket knife
Calculator
Volt / Ohm Meter
Electrical Tape
Step ladder (6')
Station manuals
Station log and pen
Open end wrenches: 3/8", 7/16", 1/2", 9/16", 15/16"
Socket wrench and 7/16" deep well socket
Adjustable wrench
Pliers
Conduit and associated tools (as required)
Felt-tipped marking pen
Claw hammer
Pipe wrench (12")
1.4 Supplies for Power and Communications Options
AC Power
Wire, conduit, and junction boxes as needed (see Figure 2.1-1).
User supplies valve box at base of station and weatherproof
enclosure for transformer. See Figure 2.1-1.
NOTE
Phone Modem
Phone modem at the central computer.
Dedicated single twisted pair with shield phone line to the weather station
valve/junction box (see Figure 2.1-1).
Short-Haul Modem
Direct burial cable with a minimum of 2-twisted pairs with shield (minimum 5
conductors total) to travel from the weather station to the central computer
junction box. Direct burial armored cable may be required for rocky soils or
rodents (Anixter p/n F-02P22BPN (phone [phone])) or equivalent type
cable (see Figure 2.1-1).
RF450
Antenna for the T107 station (14205 Yagi antenna recommended). PS24
Power Supply and #18520 Hanger Kit if not using ac power (see Appendix B).
1-6

Section 1. Preparation and Siting
1.5 Determining True North for Wind Vane
Orientation
Magnetic declination, or other methods to find True North, should be determined
prior to installing the weather station. 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 a NOAA website (Section 1.5.1). A general map showing
magnetic declination for the contiguous United States is shown in Figure 1.5-1.
Declination angles east of True North are considered negative, and are subtracted
from 0 degrees to get True North as shown Figure 1.5-2. Declination angles west
of True North are considered positive, and are added to 0 degrees to get True
North as shown in Figure 1.5-3. For example, the declination for Logan, Utah is
12.4°East. True North is 360°- 12.4°= 347.6°as read on a compass.
* 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 Measurements4.
Subtract declination from 360°Add declination to 0°
22 E
18 E
16 E
14 E
12 E
10 E 8 E 6 E 4 E 2 E 02 W
4 W
6 W
8 W
10 W
14 W
12 W
16 W
18 W
20 W
20 E
FIGURE 1.5-1. Magnetic Declination for the Contiguous United States
1-7

Section 1. Preparation and Siting
FIGURE 1.5-2. Declination Angles East of True North Are
Subtracted From 0 to Get True North
FIGURE 1.5-3. Declination Angles West of True North Are
Added to 0 to Get True North
1.5.1 Web Calculator
Since magnetic declination fluctuates with time, it should be determined each
time the wind sensor orientation is adjusted. It can be accessed at
www.ngdc.noaa.gov/geomagmodels/Declination.jsp
Below is an example for Logan, UT.
1-8

Section 1. Preparation and Siting
A positive declination is east, while a negative declination is west. The
declination in this example is 12º 24′or 12.4º. As shown in Figure 1.5-1, the
declination for Logan, UT is east, so True North for this site is 360 – 12.4, or
347.6 degrees.
References
1EPA, (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.
2WMO, (1983). Guide to Meteorological Instruments and Methods of
Observation. World Meteorological Organization No. 8, 5th edition, Geneva,
Switzerland.
3The 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.
1-9

Section 1. Preparation and Siting
1-10
4EPA, (1989). Quality Assurance Handbook for Air Pollution Measurement
Systems, EPA Office of Research and Development, Research Triangle Park,
North Carolina 27711.