How it Works
Campbell Scientific
Loading...
NW8002
User Manual
39 pgs455.77 Kb0
Table of contents
Loading...

Campbell Scientific 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
Products may not be returned without prior authorization. To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. 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 (435) 753-2342 FAX (435) 750-9540 www.campbellsci.com
Campbell Scientific Canada Corp. 11564 -149th Street Edmonton, Alberta T5M 1W7 CANADA Phone (403) 454-2505 FAX (403) 454-2655
Campbell Scientific Ltd. Campbell Park 80 Hathern Road Shepshed, Leics. LE12 9RP ENGLAND Phone (44)-50960-1141 FAX (44)-50960-1091
NW8002 WEATHER STATION INSTALLATION
INSTRUCTION MANUAL

TABLE OF CONTENTS

PAGE
Warranty ..................................................................................................................................................... i
Introduction..............................................................................................................................................I-1
1. WEATHER STATION DESCRIPTION AND INSTALLATION
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 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 Communication Testing..........................................................................................................3-1
3.2 Sensors ..................................................................................................................................3-3
3.3 Datalogger..............................................................................................................................3-5
......................................................................................................................2-1
.........................................................................................................3-1
..................................1-1
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

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
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.
-2
I-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
9,600 5.0 4.0 2.5 1,200 6.5 5.0 3.5
Miles Miles
1-1
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
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
1-2
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
FIGURE 1.3-1. NW8002 Enclosure with RAD Connection
1-3
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
FIGURE 1.3-3. NW8002AC Weather Station
1-5
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION
1.4. MAST INSTALLATION INSTRUCTIONS
The tower mounts on a cement foundation as shown in figure 1.4-1. Provided with the tower is a tilt base (figure 1.4-2), anchor bolts, and nuts. The tilt base will also be used as a template.
Step 1 Dig a 24" square hole that is 24" deep. These estimates are for heavy soils only; light, shifting, or sandy soils require a deeper base (and more cement).
Step 2 Approximately 0.3 cubic yards of cement is required to fill the hole. While the cement is setting, assemble the template (tilt base) and anchor bolts (figure 1.4-1). Set the anchor bolts in the cement leaving the threaded end of the bolts a minimum of 2" above the cement (Figure 1.4-1). This will allow the tower base to rest on the double nuts about 1 1/4" above the cement surface. Be sure to level the base! Allow time for the cement to setup before mounting the tower.
NOTE: For light, sandy, or shifting soils, the size of the concrete block should be increased.

1.4.1 WEATHER STATION ASSEMBLY

To complete the installation of the weather station, the following tools will be needed.
• screw drivers (regular and Phillips)
• open end wrenches (7/16, 1/2, 9/16)
• level
• pipe wrench
• tape measure
• step ladder (the crossarm is over 10 feet
high requiring a ladder to level sensors)
• compass (recommended for orienting wind
direction sensor)
Step 4 Mount the solar radiation and rain gage sensors on the opposite side of the crossarm. Note: Insert the sensor cables through the grommet slots to the center of the crossarm and out the 1 1/2" center hole before mounting the sensors.
Step 5 Mount the radiation shield into the 1 5/8" diameter hole on the underside of the crossarm. Insert the temperature and Relative Humidity (RH) sensor into the radiation shield. Make sure that the temperature and RH sensor is properly seated into the radiation shield.
Step 6 Apply Teflon pipe dope to the 54" X 1 1/2" mast pipe. Thread the sensor cable through the mast. Screw the pipe onto the crossarm and allow pipe to rotate around sensor cables.
Step 7 Place mast into the tower and secure the mast with the set screw. Replace the crossarm cover using the six screws.
Step 8 After the cement has setup, mount the tower onto the base.
NOTE: align the crossarm on the ground east-west. The radiation shield and the wind set should be mounted on the west side. The wind direction sensor mounts on the north side and the wind speed on the south (figures 1.3-2 and 1.4-3). Use a compass for accurate alignment.
Step 9 Vertical plumb the mast using the adjustment nuts on the tilt base and the level. Getting the bottom tower section plumb is very important. As concrete is poured into the hole, periodically check the tower for plumb using a carpenters level and make adjustments as necessary (Figure 1.4-4).
Step 1 Remove the crossarm cover and assemble the sensors on the ends of the crossarm (Figure 1.3-2). Note: For proper crossarm orientation refer to (Figure 1.4-3).
Step 2 Place the crossarm in front of you with the 1 5/8" hole on the left (Channel up).
Step 3 Mount the wind set on the left side. Mount the wind set so that the wind speed is on the side closest to you.
1-6
Step 10 Level the solar radiation and rain gage sensors. Attach the lightning rod to the 1 1/2" pipe just below the crossarm.
Step 11 Mount the enclosure on the tower approximately 36 inches below the crossarm (Figure 1.3-2).
FIGURE 1.4-1. NW8002 Cement Base
FIGURE 1.4-2. NW8002 Tower with Tilt Base
1-7
Loading...
+ 27 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use