Campbell NW8002 User manual

NW8002 WEATHER STATION INSTALLATION
INSTRUCTION MANUAL
REVISION: 3/97
COPYRIGHT (c) 1991-1997 CAMPBELL SCIENTIFIC, INC.

WARRANTY AND ASSISTANCE
The NW8002 WEATHER STATION is warranted by CAMPBELL SCIENTIFIC, INC. to be free from
defects in materials and workmanship under normal use and service for twelve (12) months from date of
shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s
obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s
option) defective products. The customer shall assume all costs of removing, reinstalling, and shipping
defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such
products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC.
products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping
damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of
merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,
indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. 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
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a purchase order to cover the repair.
815 W. 1800 N.
Logan, UT 84321-1784
USA
Phone [phone]
FAX [phone]
www.campbellsci.com
Campbell Scientific Canada Corp.
11564 -149th Street
Edmonton, Alberta T5M 1W7
CANADA
Phone [phone]
FAX [phone]
Campbell Scientific Ltd.
Campbell Park
80 Hathern Road
Shepshed, Leics. LE12 9RP
ENGLAND
Phone [phone]
FAX [phone]

NW8002 WEATHER STATION INSTALLATION
INSTRUCTION MANUAL
TABLE OF CONTENTS
PAGE
Warranty .....................................................................................................................................................i
Introduction..............................................................................................................................................I-1
1. WEATHER STATION DESCRIPTION AND INSTALLATION..................................1-1
1.1 Standard Sensors...................................................................................................................1-1
1.2 Weather Station Site Selection...............................................................................................1-1
1.3 Equipment ..............................................................................................................................1-2
1.4 Mast Installation Instructions..................................................................................................1-6
1.5 Power Supply Options............................................................................................................1-9
1.6 Sensor Wiring.......................................................................................................................1-10
1.7 Station Grounding.................................................................................................................1-10
1.8 SRM-6A Rad Modem ...........................................................................................................1-13
1.9 Phone Modem Communication............................................................................................1-15
1.10 System Check-Out ...............................................................................................................1-15
2. MAINTENANCE......................................................................................................................2-1
2.1 Weekly....................................................................................................................................2-1
2.2 Monthly...................................................................................................................................2-1
2.3 Moisture..................................................................................................................................2-2
2.4 Maintenance Log Book...........................................................................................................2-3
3. TROUBLE SHOOTING.........................................................................................................3-1
3.1 Communication Testing..........................................................................................................3-1
3.2 Sensors ..................................................................................................................................3-3
3.3 Datalogger..............................................................................................................................3-5
FIGURES
1.2-1 Effect of Structure on Wind Flow............................................................................................1-2
1.3-1 NW8002 Enclosure with RAD Connection.............................................................................1-3
1.3-2 NW8002AC/SP Weather Station Cross Arm Connection......................................................1-4
1.3-3 NW8002AC Weather Station .................................................................................................1-5
1.4-1 MW8002 Cement Base..........................................................................................................1-7
1.4-2 NW8002 Tower with Tilt Base................................................................................................1-7
1.4-3 NW8002AC/SP Weather Station (Top View).........................................................................1-8
1.4-4 Plumbing NW8002 Tower ......................................................................................................1-8
1.5-1 PS12 Volt Power Supply and Charging Regulator .................................................................1-9
1.6-1 NW8002SP Weather Station................................................................................................1-11
1.6-2 NW8002 Weather Station Sensor Connection.....................................................................1-12
1.7-1 NW8002 Station Grounding .................................................................................................1-13
1.8-1 RAD Modem Connection and Grounding.............................................................................1-14
1.8-2 NW8002 Master Station.......................................................................................................1-15
1.9.1 NE8002 Enclosure with DC112 Phone Modem Option........................................................1-16
2.1-1 Rain Gage ..............................................................................................................................2-1

2.3-1 Solar Sensor...........................................................................................................................2-2
2.3-2 6575 Temperature/Relative Humidity Probe ..........................................................................2-2
2.3-3 4831 Temperature/Relative Humidity Probe Assembly..........................................................2-3
3.1-1 RAD Testing Computer End...................................................................................................3-1
3.1-2 RAD Testing Datalogger End.................................................................................................3-2
3.2-1 4831 Temperature/Relative Humidity Probe Assembly..........................................................3-5
TABLES
1.2-1 Approximate Range, Miles .....................................................................................................1-1
1.5-1 PS12-LA Battery and AC Transformer Specifications..........................................................1-10
3.3-1 Sensor Verification; Accessing CR10 Input Locations ...........................................................3-6

I-1
INTRODUCTION
This manual covers both the NW8002AC (115 VAC power only) and the NW8002SP (solar panel)
weather stations. These weather stations are setup to communicate with the NW8000 central computer
over a short haul modem link. The heart of the weather station is the Campbell Scientific, Inc. CR10
Measurement and Control Module. A 2.5 amp hour 12 VDC sealed lead acid battery pack powers the
CR10. A solar panel or 115 VAC power is used to trickle charge the batteries.
SPECIFICATIONS
Power 12 VDC/115 VAC, 60 Hz
Avg. current drain .16 A (115 VAC)
6 mA (solar panel)
Operating
temperature range -25°C to +50°C
Operating relative
humidity range 0 to 100% non-condensing
SENSOR SPECIFICATIONS
Temperature
Range -35°C to +48°C
Accuracy ±4°C, typically better than ±2°C
Relative Humidity
Range 12 - 97% RH
Accuracy ±5%
Wind Speed
Range 0 - 112 mph
Threshold 1.1 mph
Wind Direction
Range 0 - 112 mph
Threshold 1.8 mph
Accuracy +5°
Rain
Orifice 6"
Accuracy 1% at 2"/hr or less
Resolution 0.01 inches
Global Radiation
Linearity 1% up to 3000 Wm-2
Accuracy ±5% maximum, typically ±3%
NOTE: The black outer jacket of the cables
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.

1-1
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
The weather station is designed to collect weather data for calculation of evapotranspiration of the
surrounding area where it is located. The selection of the weather station site is important; a poor site
will give non representative measurements which result in inacurate ET values.
1.1 STANDARD SENSORS
Sensors with preassigned channels include:
• Wind speed
• Wind direction
• Temperature
• Solar radiation
• Rainfall
• Relative humidity
1.2 WEATHER STATION SITE SELECTION
1. Trees, buildings, or other structures can
greatly influence wind speed and direction
observations. As a rule of thumb, a
structure will disturb the air flow an upwind
distance of about twice the height of the
structure, a downwind distance of about six
times the height of the structure, and a
vertical distance of up to twice the height of
the structure (Figure 1.2-1).
2. The station should be located over the most
typical type of turf used on the course. It
must not be placed over a concrete slab,
parking lot, or unplanted earth. This allows
the temperature and humidity readings to
closely correspond with that of the turf the
ET value is to represent.
3. The radiation shield that covers the probe
provides protection from direct sunlight and
rain. The shield does not protect against
irrigation water should any be sprayed up
into the plates.
NOTE: The weather station should not be
located where sprinklers spray water into
the rain bucket or onto the radiation shield.
4. The Solar Radiation Sensor should be
located so it is not shadowed by
surrounding objects.
5. The weather station should not be placed at
the top of a knoll or mound, but in an area
lower than the surrounding hills if possible.
This lowers the probability of it being struck
by lightning.
6. During installation, extreme care should be
taken to avoid touching or coming near
power lines. Contact could be fatal. Do not
locate the station in the vicinity of overhead
power lines.
7. The distance from the weather station to the
central computer determines the gage of
the wire and the baud rate used. In Table
1.2-1, wire gage, distance, and baud rate
can be determined.
TABLE 1.2-1 Approximate Range, Miles
Data Rate 19 Gage 24 Gage 26 Gage
bps Miles Miles Miles
9,600 5.0 4.0 2.5
1,200 6.5 5.0 3.5

SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
1-2
FIGURE 1.2-1 Effect of Structure on Wind Flow
1.3 EQUIPMENT
The following lists describe the equipment
provided by Campbell Scientific, Inc. and those
materials provided by the user.
1.3.1 MATERIALS PROVIDED BY CSI
SRM-6A RAD Modem
ENC 12/14 Nema 4X Enclosure
101-T Nutone 16V 10 VA Transformer
Packaged Inside The Enclosure: (Figure 1.3-1)
CR10 Measurement and Control Module
SRM-6A RAD Modem
SC932 9 Pin to RS232-DCE Interface
DC112 Optional phone modem (for use
with Mir 5000 systems only,
Figure 1.9-1).
PS12-LA 12 V Rechargeable Battery
Sensors: (Figure 1.3-2)
4776 Li-Cor Solar Radiation Sensor
6575 HMP35C Temperature and
RH Probe
4830 Texas Electronics Rain Gage
5537 R.M. Young Wind Speed
5538 R.M. Young Wind Direction
Hardware:
6885 10' Tower
Crossarm & sensor mounts
Tilt base & anchor bolts
Gill radiation shield
Allen wrench
Electrician putty
Desiccant
1.3.2 MATERIALS SUPPLIED BY USER
ITEM DESCRIPTION
1 Cement
2 All conduit for 16 VAC AC power
3 AC power installation and cable
4 All communication wire from computer
to weather station, see Section 1.8 for
recommended cables
5 6 ft. copper ground rod
6 RS232 Serial Port Card for central
computer

SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
1-3
FIGURE 1.3-1. NW8002 Enclosure with RAD Connection

SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
1-4
FIGURE 1.3-2. NW8002AC/SP Weather Station Cross Arm Detail

SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
1-5
FIGURE 1.3-3. NW8002AC Weather Station