Campbell | WXT520 | WXT520 Weather Transmitter

WXT520 Weather Transmitter
WXT520 Weather Transmitter
Revision: 1/12
C o p y r i g h t © 2 0 0 6 - 2 0 1 2
C a m p b e l l S c i e n t i f i c , I n c .
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 (435) 227-2342. 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
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) 227-9579. 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.
WXT520 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. General Description.....................................................1
1.1 Wind Speed and Direction........................................................................1
1.2 Precipitation..............................................................................................1
1.3 Barometric Pressure, Temperature, and Relative Humidity .....................1
2. Specifications ..............................................................1
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Wind Speed ..............................................................................................1
Wind Direction .........................................................................................2
Precipitation..............................................................................................2
Barometric Pressure..................................................................................2
Air Temperature........................................................................................2
Relative Humidity.....................................................................................2
Assembly ..................................................................................................2
3. Installation....................................................................3
3.1 Mounting to a Campbell Scientific Mast or Crossarm .............................3
3.2 Optional IP66 Mounting Device...............................................................3
3.3 Optional Bird Spike ..................................................................................3
4. Wiring Table .................................................................4
5. SDI-12 Commands .......................................................5
6. Programming ...............................................................5
6.1 CRBasic ....................................................................................................5
6.1.1 Example CR1000 Program .............................................................6
6.2 Edlog Programming..................................................................................6
6.2.1 CR10X Program..............................................................................7
Appendix
A. Configuring the WXT520 ........................................ A-1
Figures
1. Optional WXT520 IP66 Mounting Kit.......................................................3
2. Optional bird spike kit ................................................................................4
A-1. Connection Setup screen ................................................................... A-1
A-2. Device Settings screen....................................................................... A-2
i
WXT520 Table of Contents
A-3. Sensor Settings screen ....................................................................... A-3
A-4. Message Settings screen .................................................................... A-3
Tables
1. Connections to Campbell Scientific Dataloggers....................................... 4
2. SDI-12 Commands..................................................................................... 5
ii
WXT520 Weather Transmitter
1. General Description
The WXT520 Weather Transmitter, manufactured by Vaisala, measures wind
speed and direction, precipitation, barometric pressure, temperature, and
relative humidity—all in a single device that has no moving parts. The
WXT520’s SDI-12 signal can be measured by any of our SDI-12 equipped
dataloggers. The WXT520 is about the size of our larger Gill radiation shield,
making it ideal for use with our CR200(X)-series dataloggers in applications
requiring quick, short-term deployment. However, the WXT520 is not
intended for weather stations that require research-grade performance.
1.1 Wind Speed and Direction
The WXT520's wind sensor consists of three equally spaced transducers that
produce ultrasonic signals. Wind speed and direction are determined by
measuring the time it takes for the ultrasonic signal of one transducer to travel
to the other transducers. Wind direction is not calculated when the wind speed
drops below 0.05 m/s. In this case, the last calculated direction output remains
until wind speed increases. The computed wind speeds are independent of
altitude, temperature, and humidity. The WXT520 is preconfigured to provide
the minimum, average, and maximum values for both wind speed and
direction. Default wind speed units are m/s.
1.2 Precipitation
The WXT520 uses the RAINCAP® Sensor to measure accumulated rainfall,
rain intensity, and rain duration. Precipitation is measured one raindrop at a
time. Whenever a raindrop hits the precipitation sensor, an electrical signal is
produced that is proportional to the volume of the drop.
The sensor is also capable of distinguishing hail stones from raindrops. The
measured rain and hail parameters are cumulative amounts of rain or hail, rain
or hail intensity, and the duration of a shower.
1.3 Barometric Pressure, Temperature, and Relative Humidity
The WXT520 has a PTU module that contains a capacitive silicon
BAROCAP® sensor for barometric pressure measurements, a capacitive
ceramic THERMOCAP® sensor for air temperature measurements, and a
capacitive thin film polymer HUMICAP® sensor for relative humidity
measurements. The PTU is housed in a naturally aspirated radiation shield that
protects the PTU and reflects solar radiation. Default units are °Celsius for
temperature and hPa for barometric pressure.
2. Specifications
2.1 Wind Speed
Measurement Range: 0 to 60 m s-1
Accuracy: ±0.3 m s-1 or ±3% whichever is greater (0 to 35 m s-1);
±5% (36 to 60 m s-1)
Response Time: 0.25 s
1
WXT520 Weather Transmitter
2.2 Wind Direction
Measurement Range: 0° to 360°
Accuracy: ±3°
Output Resolution: 1°
2.3 Precipitation
Rainfall: cumulative accumulation after latest automatic or manual reset.
Accuracy: 5% (Due to the nature of the phenomenon, deviations caused by
spatial variations may exist in precipitation readings, especially in short
time scale. The accuracy specification does not include possible wind
induced error.)
Collecting Area: 60 cm2
Output Resolution: 0.01 mm (0.001”)
Rain Duration: counting each ten second increment when droplet detected.
Rain Intensity: one minute running average in ten second steps.
Rainfall Intensity Range: 0 to 200 mm hr-1 (broader range possible with
reduced accuracy)
2.4 Barometric Pressure
Measurement Range: 600 to 1100 hPa (mbar)
Accuracy: ±0.5 hPa @ 0° to 30°C; ±1 hPa @ -52° to +60°C
Output Resolution: 0.1 hPa
2.5 Air Temperature
Measurement Range: -52° to +60°C
Accuracy: ±0.3°C @ +20°C
Output Resolution: 0.1°C
2.6 Relative Humidity
Measurement Range: 0 to 100% RH
Accuracy: ±3% RH @ 0 to 90% RH; ±5% RH @ 90 to 100% RH
Output Resolution: 0.1% RH
2.7 Assembly
Compatible Dataloggers: CR200(X)-series, CR800, CR850, CR1000,
CR3000, CR5000, CR510, CR10(X), CR23X
Electromagnetic Compatibility: Complies with EMC standard EN61326-1;
IEC standards: IEC 60945/61000-4-4, IEC 60945/61000-4-2
Input Voltage: 5 to 30 Vdc
Typical Current Drain @ 12 Vdc: 3 mA with default measuring intervals;
0.1 mA (SDI-12 standby)
Output: SDI-12 as configured by Campbell Scientific; RS-292 and RS-485
also available
Operating Range: -52° to +60°C; 0 to 100% RH
Dimensions: 9.4" (24.0 cm) height, 4.7" (12.0 cm) diameter
Weight: 1.43 lbs (650 g)
2
WXT520 Weather Transmitter
3. Installation
3.1 Mounting to a Campbell Scientific Mast or Crossarm
The WXT520 can be mounted to a mast or CM202, CM204, or CM206
crossarm. The 18311 mounting tube is shipped with the WXT520.
A 18311 mounting tube fits in the bottom of the WXT520, and is fastened to a
mast or crossarm via the CM220 Mounting Kit. Alternatively, the 17953
1” x 1” NU-RAIL fitting can be used instead of the CM220 for mounting to a
crossarm.
3.2 Optional IP66 Mounting Device
The 25299 is an optional mounting kit for the WXT520. It provides better
protection from water intrusion. When using the 25299, the WXT520’s IP
classification is increased from IP65 to IP66.
To attach the 25299 to the WXT520, place the L-shaped tabs into the notches
on the bottom of the WXT520 (see Figure 1). Turn the WXT520 until the
mount is locked into place. Once the 25299 is in place, the WXT520 is
mounted to a mast or crossarm using the method described in Section 3.1.
FIGURE 1. Optional WXT520 IP66 Mounting Kit
3.3 Optional Bird Spike
The 25300 Bird Spike device is fastened on top of the WXT520 using the set
screw provided (see Figure 2). This device is used to discourage birds from
roosting on the WXT520. It consists of a metallic band with spikes pointing
upward. The spike’s shape and location ensure minimal interference of wind
and rain measurements.
3
WXT520 Weather Transmitter
NOTES:(1) The spikes are designed not to hurt the birds.
(2) While the use of this device does discourage interference from
birds, absolute protection cannot be guaranteed.
(3) When this device is attached, snow may be more prone to
accumulate on the head of the WXT520. In addition, the snow may
melt away more slowly during periods of thaw.
FIGURE 2. Optional bird spike device
4. Wiring Table
TABLE 1. Connections to Campbell Scientific Dataloggers
Color
Brown
Clear
(silver)
or Red
Blue
White
Green
Yellow
Pink
Grey
4
Description
Power
Power ground
SDI-12 Signal
SDI-12 Signal
data ground
Optional heater
power (see note)
Optional heater
ground (see note)
CR1000, CR800,
CR850, CR3000,
CR5000,
CR9000(X)
12 V
G
CR10(X),
CR510
12 V
G
21X, CR23X,
CR7
+12
G
CR200(X)
SW Battery
G
C1
C1
G
12V
C2
C2
G
12V
C2
C2
G
+12
C1
C1
G
SW Battery
G
G
G
G
Not used
Not used
Not used
Not used
WXT520 Weather Transmitter
NOTE
Unless special ordered, the heater will not be operational for
WXT520s purchased from Campbell Scientific. Although the
heater is not operational, the WXT520 will have a pink and
yellow wire. Do not connect the pink and yellow wire unless the
heater is operational.
5. SDI-12 Commands
Campbell Scientific uses the SDI-12 protocol to communicate with the
WXT520. Both "aM!" and "aR!" commands are supported (where "a" is the
sensor address). The preferred command is "aR!", since the communication is
done in fewer steps. The WXT520 is configured to run continuously so the
output is identical. Table 2 contains the outputs as configured by Campbell
Scientific. All outputs are in SI units.
TABLE 2. SDI-12 Commands
SDI-12
Command
Command
Function
aR! or aM!
Composite
Message
Wind Direction Average, Wind Speed
Average, Air Temperature, Relative
Humidity, Barometric Pressure, Rainfall
Amount, Hail Amount
aR1! or
aM1!
Wind Message
Wind Direction Minimum, Wind Direction
Average, Wind Direction Maximum, Wind
Speed Minimum, Wind Speed Average,
Wind Speed Maximum
aR2! or
aM2!
PTU Message
Air Temperature, Relative Humidity,
Barometric Pressure
aR3! or
aM3!
Precipitation
Message
Rainfall Amount, rainfall Duration, Rainfall
Intensity, Hail Amount, Hail Duration, Hail
Intensity
aR5! or
aM5!
Self Diagnostic
Message
Supply Voltage, Internal Reference Voltage
Values Returned
6. Programming
6.1 CRBasic
Dataloggers that use CRBasic include our CR200(X)-series, CR800, CR850,
CR1000, CR3000, and CR5000. These dataloggers use the SDI12Recorder
instruction to read the WXT520.
The SDI12Recorder instruction has the following form:
SDI12Recorder(Destination, Output String, Multiplier, Offset)
5
WXT520 Weather Transmitter
6.1.1 Example CR1000 Program
Although the following program is for the CR1000, other CRBasic dataloggers
are programmed similarly. This program uses the “aR!” command.
'CR1000 Series Datalogger
Public PTemp, batt_volt
Public WXT520(7)
'Values are updated internally in the WXT520 every 5 seconds
Alias WXT520(1)=Wdavg
Alias WXT520(2)=Wsavg
Alias WXT520(3)=Airtemp
Alias WXT520(4)=Relhumidity
Alias WXT520(5)=Airpressure
Alias WXT520(6)=Ramount
Alias WXT520(7)=Hamount
Units Wdavg = Degrees
Units Wsavg = m/s
Units Airtemp = Celcius
Units Relhumidity = %
Units Airpressure = hPa
Units Ramount = mm
Units Hamount = hits/cm^2
DataTable (Test,1,-1)
DataInterval (0,60,Sec,10)
Average (5,WXT520(1),IEEE4,False)
Totalize (2,WXT520(6),FP2,False)
Minimum (1,batt_volt,FP2,0,False)
Sample (1,PTemp,FP2)
EndTable
BeginProg
'Running a 5 second scan to coincide with 5 second
'update interval of the WXT520
Scan (5,Sec,0,0)
PanelTemp (PTemp,250)
Battery (Batt_volt)
'WXT520 connected to SDI12 port 1
SDI12Recorder (WXT520(1),1,0,"R!",1.0,0)
CallTable Test
NextScan
EndProg
6.2 Edlog Programming
Our CR500, CR510, CR10(X), and CR23X dataloggers are programmed with
Edlog.
These dataloggers use Instruction 105 to read the WXT520. Your datalogger
manual has a detailed explanation of Instruction 105.
6
WXT520 Weather Transmitter
Please note that Edlog only allocates one input location for Instruction 105.
Additional input locations need to be inserted manually using the Input
Location Editor.
6.2.1 CR10X Program
The following example is the portion of a CR10X program that measures the
WXT520. A complete program will include output processing instructions.
;
wind direction
wind speed
; Get WXT520 Values 1 - 6 (Dn=Wd min, Dm=Wd avg, Dx=Wd max, Sn=Ws min, Sm=Ws avg, Sx=Ws max)
22: SDI-12 Recorder (P105) ;
1: 0
SDI-12 Address
2: 1
Start Measurement (aM1!)
3: 2
Port
4: 15
Loc [ Value1 ]
5: 1.0
Mult
6: 0.0
Offset
; corresponds with Wind message Command R1
; control port for SDI-12 comms
23: Excitation with Delay (P22)
1: 1
Ex Channel
2: 0
Delay W/Ex (0.01 sec units)
3: 50
Delay After Ex (0.01 sec units)
4: 0
mV Excitation
; Get WXT520 Values 7 - 9 (Ta= air temp, Ua= rel humidity, Pa= air pressure)
24: SDI-12 Recorder (P105)
1: 0
SDI-12 Address
2: 2
Start Measurement (aM2!)
3: 2
Port
4: 21
Loc [ Value7 ]
5: 1.0
Multiplier
6: 0.0
Offset
; corresponds with Pressure Humidity and
Temp Message Command R2
25: Excitation with Delay (P22)
1: 1
Ex Channel
2: 0
Delay W/Ex (0.01 sec units)
3: 50
Delay After Ex (0.01 sec units)
4: 0
mV Excitation
;
rain
hail
; Get WXT520 Values 10 - 15 (Rc= amount, Rd= duration, Ri= intensity, Hc= amount, Hd= duration, Hi = intensity)
26: SDI-12 Recorder (P105)
1: 0
SDI-12 Address
2: 3
Start Measurement (aM3!)
3: 2
Port
4: 24
Loc [ Value10 ]
5: 1.0
Multiplier
6: 0.0
Offset
; corresponds with Precip Message Command R3
7
WXT520 Weather Transmitter
8
Appendix A. Configuring the WXT520
NOTE
Modifying the default configuration of the WXT520 requires the
purchase of a grey configuration cable; contact Campbell
Scientific for more information.
1.
Connect one end of the grey Configuration Cable to a COM port on the PC
and the other end of the cable to the “Service” connector on the WXT520.
2.
Connect a 9 V battery to the Configuration Cable’s battery clip. The
female contact of the battery clip is (+).
3.
On your PC, run Vaisala’s WXT Configuration Tool Software and go to
the Connection Setup Screen.
4.
Enter the settings for each of the Connection Setup Screen’s parameters
(see Figure A-1). The default settings are:
5.
•
Connect using: enter the COM Port in which the Configuration
Cable is connected.
•
Bits per second: 19200
•
Parity: 8-N-1
Click on the OK button.
FIGURE A-1. Connection Setup screen
A-1
Appendix A. Configuring the WXT520
6.
Go to the Device Settings Screen and enter the settings for each of the
parameters (see Figure A-2). Default settings are:
•
Device—Address: 0
•
Heating and self diagnostic—verify Enable Heating is NOT
selected.
•
Heating and self diagnostics—Update Interval: 15 s
•
Communication protocol—select SDI-12 v1.3
•
User port settings—Port type: SDI-12, select continuous
measurements
FIGURE A-2. Device Settings screen
A-2
7.
Click on the OK button.
8.
Go to the Sensor Settings Screen (see Figure A-3). The default Wind and
PTU Update intervals are set to 5 s.
Appendix A. Configuring the WXT520
FIGURE A-3. Sensor Settings screen
9.
Click on the OK button.
10. Go to the Message Settings Screen and verify that Message Settings are as
desired. The default settings are shown in Figure A-4.
Note: Hail accumulation should be checked.
FIGURE A-4. Message Settings screen
A-3
Appendix A. Configuring the WXT520
11. Click on the OK button.
12. Close the WXT Configuration Tool.
13. Remove the 9 V battery.
14. Disconnect the Configuration Cable.
15. Secure protective service port cap on PTU.
A-4
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 444
Thuringowa Central
QLD 4812 AUSTRALIA
www.campbellsci.com.au • info@campbellsci.com.au
Campbell Scientific do Brazil Ltda. (CSB)
Rua Luisa Crapsi Orsi, 15 Butantã
CEP: 005543-000 São Paulo SP BRAZIL
www.campbellsci.com.br • suporte@campbellsci.com.br
Campbell Scientific Canada Corp. (CSC)
11564 - 149th Street NW
Edmonton, Alberta T5M 1W7
CANADA
www.campbellsci.ca • dataloggers@campbellsci.ca
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. (France)
3 Avenue de la Division Leclerc
92160 ANTONY
FRANCE
www.campbellsci.fr • info@campbellsci.fr
Campbell Scientific Spain, S. L.
Avda. Pompeu Fabra 7-9, local 1
08024 Barcelona
SPAIN
www.campbellsci.es • info@campbellsci.es
Please visit www.campbellsci.com to obtain contact information for your local US or International representative.
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising