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.
NW8002 WEATHER STATION INSTALLATION INSTRUCTION MANUAL TABLE OF CONTENTS PAGE Warranty .....................................................................................................................................................i Introduction .............................................................................................................................................. I-1 1. 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 2. 2.1 2.2 2.3 2.4 3. 3.1 3.2 3.
2.3-1 2.3-2 2.3-3 3.1-1 3.1-2 3.2-1 Solar Sensor........................................................................................................................... 2-2 6575 Temperature/Relative Humidity Probe .......................................................................... 2-2 4831 Temperature/Relative Humidity Probe Assembly.......................................................... 2-3 RAD Testing Computer End ..............................................................................
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.
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.
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 ENC 12/14 101-T RAD Modem Nema 4X Enclosure Nutone 16V 10 VA Transformer Hardware: 6885 10' Tower Crossarm & sensor mounts Tilt base & anchor bolts Gill radiation shield Allen wrench Electrician putty Desiccant 1.3.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.3-1.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.3-2.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.3-3.
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.
FIGURE 1.4-1. NW8002 Cement Base FIGURE 1.4-2.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.4-3. NW8002AC/SP Weather Station (Top View) FIGURE 1.4-4.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION 1.5 POWER SUPPLY OPTIONS 1.5.1 AC POWER A -120 to 16 VAC Transformer is supplied with the NW8002 Weather Station. The transformer must be connected to 120 VAC according to national and local electrical codes. The distance that the low level 16 VAC voltage can be run depends upon the size of the wire used. A 22 awg wire can be run up to 600 feet. An 18 awg wire can be run up to 1500 feet.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION The two leads from the charging source can be inserted into either of the CHG ports, polarity doesn't matter. A transzorb provides transient protection to the charging circuit. A sustained input voltage in excess of 40V will cause the transzorb to limit voltage. CAUTION: Switch the power to "off" before disconnecting or connecting the power leads to the Wiring Panel. The Wiring Panel and PS12-LA are at power ground.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.6-1.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.6-2.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.7-1. NW8002 Station Grounding 1.8 SRM-6A RAD MODEM The SRM-6A Rad Modem consists of two modems, one at the datalogger site and one at the computer site. The modem at the datalogger site is connected to the CR10 through the SC932. The modem at the computer site is connected to the computer through a 25 pin RS232 serial port. The two modems are connected via 4-wire unconditioned telephone line, or two twisted pairs. (Figures 1.8-1 and 1.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.8-1.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.8-2. NW8002 Master Station 1.9 PHONE MODEM COMMUNICATION For use with MIR 5000 Systems only. The DC112 Modem is a 300/1200 baud modem employing the popular "AT" command set. The modem is powered and enabled by the datalogger. A Hayes or Hayes compatible modem is used at the computer site to communicate with the weather station. 1.10 SYSTEM CHECK-OUT Things to double check and verify before leaving the weather station.
SECTION 1. WEATHER STATION DESCRIPTION AND INSTALLATION FIGURE 1.9.
SECTION 2. MAINTENANCE The weather station has been engineered to provide many years of reliable service. Periodic maintenance, however, is required to help insure that the system performs up to its potential. The following maintenance schedule is important in the effective continuous operation of the weather station. Log notes are included in order to track the progress of maintenance and record any problems.
SECTION 2. MAINTENANCE 2.2.3 TEMPERATURE AND RELATIVE HUMIDITY PROBE Visually inspect the Temperature/Relative Humidity Sensor in extreme weather conditions, and clean if necessary. (Refer to 2-3 month section for cleaning procedures). 2.2.4 WIND SPEED AND DIRECTION SENSORS Spin the wind direction and wind speed sensors to be sure they move freely. CAUTION!: DO NOT use WD-40 or other lubricants on the bearings. 2.2.5 MOISTURE The enclosure should have desiccant in it to absorb moisture.
SECTION 2. MAINTENANCE sensor is rugged, the function of it is to sense water vapor in the air; therefore, careful handling is very important. A gentle clean (oil free) air blast, or a gentle brush with clean, soft, camel's hair is best for cleaning. 1) If the chip has a film of dirt, oil, or other contamination on it, replace the chip. 2) If the clip socket to which the chip is fastened to is rusty, replace the sensor. Contact your Toro distributor for sensor or chip replacement.
SECTION 2.
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SECTION 2.
SECTION 3. TROUBLESHOOTING Recommended equipment: Volt/Ohm meter CR10KD Keyboard Display PC208 Datalogger Support software Small screwdriver When trouble shooting a problem with the weather station, the system can be divided into three sections: 1) Communication, 2) Sensors, and 3) Datalogger. Determine what portion of the system is failing by asking the following questions: 1. Is the computer communicating with the weather station? YES -- go to question 2. NO -- go to question 3. 2.
SECTION 3. TROUBLESHOOTING FIGURE 3.1-2 RAD Testing Datalogger End 1. Disconnect the four conductor cables from the SRM-6A RAD modem at the computer end. Inside the SRM-6A, jumper the XMT + to RCV + and jumper the XMT - to RCV -. This creates a transmit loop which allows any key pressed at the computer keyboard to be seen on the screen.
SECTION 3. TROUBLESHOOTING The line monitor is connected to the RS232 serial data cable between the computer and short haul modem. The data line monitor has seven lights indicating the status of the RS232 serial communication. By observing these lights in the order given below you may be able to determine the problems with the computer link. Pin 6 - DSR Data Set Ready. The short haul modem holds this line high all the time. Pin 20 - DTR Data Terminal Ready. The software holds this line high.
SECTION 3. TROUBLESHOOTING Rain Gage The Rain Gage has a reed switch that closes as the tipping bucket tips. To check the Rain Gage, connect the Ohm meter to the two wires and tip the bucket VERY SLOWLY past the center point. As this is done, you should get some continuity through the circuit. If there is NO continuity, then the reed switch is probably bad.
FIGURE 3.2-1 4831 Temperature/Relative Humidity Probe Assembly Measure the resistance of the temperature probe by connecting the ohm meter across the red and black leads. The temperature sensor has a inverse relationship between resistance and temperature, the higher the ambient temperature the lower the resistance of the probe. If the temperature readings are high, visually inspect the leads of the thermistor to see if condensation or bugs have caused an alternate electrical path of lower resistance.
SECTION 3. TROUBLESHOOTING NOTE: If at any time you make a mistake or loose you place, start over by keying the * symbol. The weather station should be left in the LOG12 mode to minimize current drain on the batteries. NOTE: If the battery power is lost, the data stored in the CR10's Final Memory IS LOST. TABLE 3.3-1. Sensor Verification; Accessing CR10 Input Locations ENTER DESCRIPTION DISPLAY** *0 Compile program LOG12 *6 Enter input locations 06:0000 A(Adv) CR10 Temperature 01:25.
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