Lufft WS200-UMB User manual

Operating Manual English
Compact Weather Station
WS200-UMB WS300-UMB
WS301-UMB WS400-UMB
WS500-UMB WS501-UMB
WS600-UMB
www.lufft.com

© G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany. We reserve the right to make technical changes at any time without notice.

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 3
Contents
1Please Read Before Use.............................................................................................................................................5
1.1 Symbols Used .....................................................................................................................................................5
1.2 Safety Instructions...............................................................................................................................................5
1.3 Designated Use...................................................................................................................................................5
1.4 Incorrect Use.......................................................................................................................................................5
1.5 Guarantee............................................................................................................................................................5
1.6 Brand Names.......................................................................................................................................................5
2Scope of Delivery........................................................................................................................................................6
3Order Numbers............................................................................................................................................................6
3.1 Accessories.........................................................................................................................................................8
3.2 Spare Parts..........................................................................................................................................................8
3.3 Additional Documents and Software....................................................................................................................8
4Equipment Description...............................................................................................................................................9
4.1 Air Temperature and Humidity.............................................................................................................................9
4.2 Air Pressure.........................................................................................................................................................9
4.3 Precipitation.........................................................................................................................................................9
4.4 Wet Bulb Temperature.........................................................................................................................................9
4.5 Specific Enthalpy.................................................................................................................................................9
4.6 Air Density.........................................................................................................................................................10
4.7 Wind ..................................................................................................................................................................10
4.8 Compass ...........................................................................................................................................................10
4.9 Heating..............................................................................................................................................................10
4.10 Global Radiation................................................................................................................................................10
4.11 Sensor Technology (example: WS600-UMB)....................................................................................................11
5Generation of Measurements...................................................................................................................................12
5.1 Current Measurement (act)................................................................................................................................12
5.2Minimum and Maximum Values (min and max).................................................................................................12
5.3 Average Value (avg)..........................................................................................................................................12
5.4 Vectorial Average Value (vct)............................................................................................................................12
6Measurement Output ................................................................................................................................................13
6.1 Air and Dewpoint Temperature..........................................................................................................................13
6.2 Wind Chill Temperature.....................................................................................................................................13
6.3 Humidity.............................................................................................................................................................13
6.4 Air Pressure.......................................................................................................................................................13
6.5 Wet Bulb Temperature.......................................................................................................................................14
6.6 Specific Enthalpy...............................................................................................................................................14
6.7 Air Density.........................................................................................................................................................14
6.8 Wind Speed.......................................................................................................................................................15
6.9 Wind Direction...................................................................................................................................................15
6.10 Wind Measurement Quality ...............................................................................................................................16
6.11 Compass ...........................................................................................................................................................16
6.12 Precipitation Quantity - Absolute .......................................................................................................................17
6.13 Precipitation Quantity - Differential ....................................................................................................................17
6.14 Precipitation Intensity.........................................................................................................................................17
6.15 Precipitation Type..............................................................................................................................................18
6.16 Heating Temperature.........................................................................................................................................18
6.17 Global Radiation................................................................................................................................................18
7Installation.................................................................................................................................................................19
7.1 Fastening...........................................................................................................................................................19
7.2 North Alignment.................................................................................................................................................20
7.3 Selecting the Installation Location .....................................................................................................................21

Operating Manual Compact Weather Station
4G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
8Connections.............................................................................................................................................................. 23
8.1 Supply Voltage.................................................................................................................................................. 23
8.2 RS485 Interface................................................................................................................................................ 23
8.3 Connection to ISOCON-UMB (8160.UISO) ...................................................................................................... 24
8.4 Use of Surge Protection (8379.USP)................................................................................................................ 24
9Commissioning ........................................................................................................................................................ 25
10 Configuration and Test............................................................................................................................................ 26
10.1 Factory Settings................................................................................................................................................ 26
10.2 Configuration with the UMB-Config-Tool........................................................................................................... 26
10.3 Function Test with UMB-Config-Tool................................................................................................................ 31
10.4 Operating Modes for Equipment Heating.......................................................................................................... 32
11 Firmware Update...................................................................................................................................................... 34
12 Maintenance.............................................................................................................................................................. 34
13 Technical Data.......................................................................................................................................................... 35
13.1 Measuring Range / Accuracy............................................................................................................................ 36
13.2 Drawings........................................................................................................................................................... 38
14 EC Certificate of Conformity ................................................................................................................................... 44
15 Fault Description...................................................................................................................................................... 45
16 Disposal .................................................................................................................................................................... 46
16.1 Within the EC.................................................................................................................................................... 46
16.2 Outside the EC ................................................................................................................................................. 46
17 Repair / Corrective Maintenance............................................................................................................................. 46
17.1 Technical Support............................................................................................................................................. 46
18 Appendix................................................................................................................................................................... 47
18.1 Channel List Summary...................................................................................................................................... 47
18.2 Channel List Summary per TLS2002 FG3........................................................................................................ 49
18.3 Communication in Binary Protocol.................................................................................................................... 50
18.4 Communication in ASCII Protocol..................................................................................................................... 53
18.5 Communication in Terminal Mode .................................................................................................................... 55
18.6 Communication in SDI-12 Mode....................................................................................................................... 58
18.7 Communication in Modbus Mode...................................................................................................................... 90
19 List of Figures........................................................................................................................................................... 98
20 Index.......................................................................................................................................................................... 99

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 5
1 Please Read Before Use
1.1 Symbols Used
Important information concerning potential hazards to the user
Important information concerning the correct operation of the equipment
1.2 Safety Instructions
Installation and commissioning must be carried out by suitably qualified
specialist personnel only.
Never take measurements on or touch live electrical parts.
Pay attention to the technical data and storage and operating conditions.
1.3 Designated Use
The equipment must only be operated within the range of the specified technical
data.
The equipment must only be used under the conditions and for the purposes for
which it was designed.
The safety and operation of the equipment can no longer be guaranteed if it is
modified or adapted.
1.4 Incorrect Use
If the equipment is installed incorrectly
It may not function.
It may be permanently damaged.
Danger of injury may exist if the equipment is allowed to fall.
If the equipment is not connected correctly
It may not function.
It may be permanently damaged.
The possibility of an electrical shock may exist.
1.5 Guarantee
The guarantee period is 12 months from the date of delivery. The guarantee is forfeited if the
designated use is violated.
1.6 Brand Names
All brand names referred to are subject without limitation to the valid trademark and
ownership rights of the respective owner.

Operating Manual Compact Weather Station
6G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
2 Scope of Delivery
Equipment
WS200-UMB WS300-UMB WS400-UMB WS500-UMB WS600-UMB WS301-UMB WS501-UMB
Connection cable 10m
Operating manual
3 Order Numbers
WS200-UMB 8371.U01
Wind direction
Wind speed
Compass
WS300-UMB 8372.U01
Air temperature
Relative humidity
Air pressure
WS301-UMB 8374.U01
Air temperature
Relative humidity
Air pressure
Global Radiation
WS400-UMB 8369.U01 (Europe, USA, Canada)
Precipitation 8369.U02 (UK)
Air temperature
Relative humidity
Air pressure

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 7
WS500-UMB 8373.U01
Wind direction
Wind speed
Air temperature
Relative humidity
Air pressure
Compass
WS501-UMB 8375.U01
Wind direction
Wind speed
Air temperature
Relative humidity
Air pressure
Compass
Global Radiation
WS600-UMB 8370.U01 (Europe, USA, Canada)
Precipitation 8370.U02 (UK)
Wind direction
Wind speed
Air temperature
Relative humidity
Air pressure
Compass

Operating Manual Compact Weather Station
8G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
3.1 Accessories
Power supply unit
24V/100VA
8366.USV1
ISOCON-UMB
8160.UISO
Surge protection
8379.USP
3.2 Spare Parts
Connection cable 10m
On enquiry
3.3 Additional Documents and Software
You can download the following documents and software via the Internet at www.lufft.com.
Operating Manual
This document
UMB-Config-Tool
Windows®software for testing, firmware updates and
configuration of UMB devices
UMB Protocol
Communications protocol for UMB devices
Firmware
The current device firmware

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 9
4 Equipment Description
The WS family is a range of low cost, compact weather stations for the acquisition of a
variety of measurement variables, as used for example for environmental data logging in
road traffic management systems. Depending on the model, each device has a different
combination of sensors for the various measurement variables.
WS200-
UMB
WS300-
UMB
WS301-
UMB
WS400-
UMB
WS500-
UMB
WS501-
UMB
WS600-
UMB
Air temperature
●
●
●
●
●
●
Humidity
●
●
●
●
●
●
Air pressure
●
●
●
●
●
●
Precipitation
●
●
Wind direction
●
●
●
●
Wind speed
●
●
●
●
Compass
●
●
●
●
Global Radiation
●
●
Attention: Please note that, due to the approval of the radar sensor used, there are different
country options on equipment which includes precipitation measurement.
The equipment is connected by way of an 8 pole screw connector and associated
connection cable (length 10m).
The measured values are requested over the RS485 interface in accordance with UMB
protocol.
During commissioning, configuration and measurement polling takes place using the UMB-
Config-Tool (Windows®PC software).
4.1 Air Temperature and Humidity
Temperature is measured by way of a highly accurate NTC-resistor while humidity is
measured using a capacitive humidity sensor. In order to keep the effects of external
influences (e.g. solar radiation) as low as possible, these sensors are located in a ventilated
housing with radiation protection. In contrast to conventional non-ventilated sensors, this
allows significantly more accurate measurement during high radiation conditions.
Additional variables such as dewpoint, absolute humidity and mixing ratio are calculated
from air temperature and relative humidity, taking account of air pressure.
4.2 Air Pressure
Absolute air pressure is measured by way of a built-in sensor (MEMS). The relative air
pressure referenced to sea level is calculated using the barometric formula with the aid of
the local altitude, which is user-configurable on the equipment.
4.3 Precipitation
Tried and tested radar technology from the R2S-UMB sensor is used to measure
precipitation. The precipitation sensor works with a 24GHz Doppler radar, which measures
the drop speed and calculates precipitation quantity and type by correlating drop size and
speed.
4.4 Wet Bulb Temperature
The wet bulb temperature is the temperature resulting between a wetted or iced surface at a
flowing air.
4.5 Specific Enthalpy
Parameter of state of the humid air, composed of the specific enthalpies (heat capacity) of
the components of the mixture and related to the mass fraction of the dry air (at 0°C).

Operating Manual Compact Weather Station
10 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
4.6 Air Density
The air density indicates how much mass in a given volume of air is contained and it is
calculated from the measured values of air temperature, humidity and air pressure.
4.7 Wind
The wind meter uses 4 ultrasound sensors which take cyclical measurements in all
directions. The resulting wind speed and direction are calculated from the measured run-time
sound differential.
4.8 Compass
The integrated electronical compass (only device version 023 or higher) can be used to
check the north –south adjustment of the sensor housing for wind direction measurement. It
is also used to calculate the compass corrected wind direction.
4.9 Heating
The precipitation sensor and wind meter are heated for operation in winter.
Note: the heating is designed for ambient temperatures down to -10°C, below -10°C the
function cannot be ensured under all conditions.
4.10 Global Radiation
The global radiation is measured by a pyranometer mounted in the top cover of the WS301
and WS501.

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 11
Figure 1: Sensor
Technology
4.11 Sensor Technology (example: WS600-UMB)
Precipitation sensor
(heated)
Wind meter
(heated)
Air temperature and relative
humidity with fan on underside
of device
Connector
Mounting bracket with
springs and self-locking nuts
Air pressure sensor in
device
Notch for attaching
connection cable

Operating Manual Compact Weather Station
12 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
5 Generation of Measurements
5.1 Current Measurement (act)
In accordance with the specified sampling rate, the value of the last measurement is
transmitted when the current measurement value is requested. Each measurement is stored
in a circular buffer for the subsequent calculation of minimum, maximum and average
values.
5.2 Minimum and Maximum Values (min and max)
When requesting the minimum and maximum values, the corresponding value is calculated -
via the circular buffer at the interval (1 –10 minutes) specified in the configuration - and
transmitted.
Note: In the case of wind direction, the minimum / maximum value indicates the direction at
which the minimum / maximum wind speed was measured.
5.3 Average Value (avg)
When requesting the average value, this is calculated - via the circular buffer at the interval
(1 –10 minutes) specified in the configuration - and transmitted. In this way moving
averages can also be calculated.
For some values the standard deviation is calculated for the same interval. The calculation of
standard deviation will only be activated after the related UMB channel has been requested
for the first time.
5.4 Vectorial Average Value (vct)
In the specific case of wind measurement, measurements are calculated vectorially. To this
end, the average values of the vectors are generated internally. Hence the value (wind
speed) and angle (wind direction) of the vector are calculated.
Note: On delivery, the interval for the calculation of minimum, maximum and average values
is set at 10 minutes. If necessary, this can be adjusted to the particular requirements (1 –10
minutes) with the aid of the UMB-Config-Tool (see page 26).

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 13
6 Measurement Output
Measurements are transmitted in accordance with UMB binary protocol (Factory Settings).
You can find an example of a measurement request in different protocols and a complete
summary of the list of channels in the Appendix.
6.1 Air and Dewpoint Temperature
Sampling rate 1 minute
Generation of average value 1 –10 minutes
Units °C; °F
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
unit
100
120
140
160
Air temperature
-50.0
60.0
°C
105
125
145
165
Air temperature
-58.0
140.0
°F
110
130
150
170
Dewpoint temperature
-50.0
60.0
°C
115
135
155
175
Dewpoint temperature
-58.0
140.0
°F
6.2 Wind Chill Temperature
Sampling rate 1 minute, computed on base of the average temperature
and average wind speed
Units °C; °F
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
unit
111
Wind chill temperature
-60.0
70.0
°C
116
Wind chill temperature
-76.0
158.0
°F
6.3 Humidity
Sampling rate 1 minute
Generation of average value 1 –10 minutes
Units %RH; g/m³; g/kg
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
unit
200
220
240
260
Relative humidity
0.0
100.0
%
205
225
245
265
Absolute humidity
0.0
1000.0
g/m³
210
230
250
270
Mixing ratio
0.0
1000.0
g/kg
6.4 Air Pressure
Sampling rate 1 minute
Generation of average value 1 –10 minutes
Unit hPa
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
unit
300
320
340
360
Absolute air pressure
300
1200
hPa
305
325
345
365
Relative air pressure
300
1200
hPa
Note: For the correct calculation of relative air pressure, the altitude of the location must be
entered in the device configuration (see Figure 11 on page 28). The factory setting for
altitude is 0m; in this way both measurement variables deliver the same values.

Operating Manual Compact Weather Station
14 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
6.5 Wet Bulb Temperature
Sampling rate 1 minute
Units °C; °F
Request channels:
UMB-Kanal
Measuring Range
act
Measurement Variable (float)
min
max
unit
114
WetBulbTemperature
-50.0
60.0
°C
119
WetBulbTemperature
-58.0
140.0
°F
6.6 Specific Enthalpy
Sampling rate 1 minute
Unit kJ/kg
Request channels:
UMB-Kanal
Measuring Range
act
Measurement Variable (float)
min
max
unit
215
SpecificEnthalpy
-100.0
1000.0
kJ/kg
6.7 Air Density
Sampling rate 1 minute
Unit kg/m³
Request channels:
UMB-Kanal
Measuring Range
act
Measurement Variable (float)
min
max
unit
310
Air Density
0.0
3.0
kg/m³

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 15
6.8 Wind Speed
Sampling rate 10 seconds
Generation of average value 1 –10 minutes
Generation of maximum value 1 –10 minutes based on the internal second
measurements
Units m/s; km/h; mph; kts
Response threshold 0.3 m/s
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
vct
Measurement Variable (float)
min
max
unit
400
420
440
460
480
Wind Speed
0
60.0
m/s
405
425
445
465
485
Wind Speed
0
216.0
km/h
410
430
450
470
490
Wind Speed
0
134.2
mph
415
435
455
475
495
Wind Speed
0
116.6
kts
401
Wind Speed Fast
0
60.0
m/s
406
Wind Speed Fast
0
216.0
km/h
411
Wind Speed Fast
0
134.2
mph
416
Wind Speed Fast
0
116.6
kts
403
Wind Speed Standard
Deviation
0
60.0
m/s
413
Wind Speed Standard
Deviation
0
134.2
mph
Note: The second measurements are averaged over 10 seconds for the output of the current
measurement. The 'fast' channels deliver every second a current value, but with reduced
accuracy.
6.9 Wind Direction
Sampling rate 10 seconds
Generation of average value 1 –10 minutes
Generation of maximum value 1 –10 minutes based on the internal second
measurements
Unit °
Response threshold 0.3 m/s
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
vct
Measurement Variable (float)
min
max
unit
500
520
540
580
Wind Direction
0
359.9
°
501
Wind Direction Fast
0
359.9
°
502
Wind Direction Corrected
0
359.9
°
503
Wind Direction Standard
Deviation
0
359.0
°
Note: The second measurements are averaged over 10 seconds for the output of the current
measurement. The 'fast' channels deliver every second a current value, but with reduced
accuracy.
The minimum / maximum wind direction indicates the direction at which the minimum /
maximum wind speed was measured.
The corrected wind direction is calculated from the wind direction measured by the wind
sensor and the heading measured by the compass.
Optionally the compass correction of the wind direction can be activated for all wind direction
values. (Settings by UMB Config Tool)
Note: The correction function is designed for correction of the wind direction of a statically
mounted sensor. If the alignment of the sensor changes during the measurement (i.e. if the
sensor is mounted on a rotating platform or similar) the correction function will not in all
cases work properly, specially not for the vector average.
It is of course possible to use the correction function for mobile measurement units, where
the alignment is changed between measurement periods.

Operating Manual Compact Weather Station
16 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
6.10 Wind Measurement Quality
Sampling rate 10 seconds
Unit %
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
vct
Measurement Variable (float)
min
max
unit
805
Wind Value Quality
0
100
%
Note: The value is updated every 10 seconds and transmits the minimum wind
measurement quality for the last minute.
This value allows the user to assess how well the measurement system is functioning in the
respective ambient conditions. In normal circumstances the value is 90 - 100%. Values up to
50% do not represent a general problem. If the value falls towards zero the measuring
system is reaching its limits.
If during critical ambient conditions the system is no longer able to conduct reliable
measurements, error value 55h (85d) is transmitted (device unable to execute valid
measurement due to ambient conditions).
6.11 Compass
(only device version 023 or higher)
Sampling rate: 5 min
Unit °
Request channels:
UMB Channel
Measuring Range
act
min
max
avg
vct
Measurement Variable (float)
min
max
unit
510
Compass Heading
0
359
°
Note: Reliable operation of the compass is only possible, if the sensor has been mounted
according to the instructions in this manual, i.e. on top of the pole. Should the sensor be
mounted on a traverse, the distribution of iron masses will be different from the situation
during factory calibration. This may lead to additional deviation of the bearing. This also
applies to lightning rods mounted at the pole top!
Dependent on the location of the installation the local declination of the earth magnetic field
has to be considered. The declination value is entered using the UMB-Config-Tool (see page
28). The declination for the installation location can be found in the Internet, e.g. at
http://www-app3.gfz-potsdam.de/Declinationcalc/declinationcalc.html
http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 17
6.12 Precipitation Quantity - Absolute
Sampling rate Event-dependent on reaching the response threshold
Response threshold 0.01mm
Units l/m²; mm; in; mil
Request channels:
UMB Channel
Measurement Variable (float)
Unit
600
Precipitation Quantity - Absolute
l/m²
620
Precipitation Quantity - Absolute
mm
640
Precipitation Quantity - Absolute
in
660
Precipitation Quantity - Absolute
mil
Note: This measurement indicates the accumulated precipitation quantity since the last
device reboot. The measurement is retained for the duration of a short power failure (up to
15 minutes). To reset this value, use the corresponding function in the UMB-Config-Tool
(see page 30) or disconnect the device from the power supply for at least one hour.
6.13 Precipitation Quantity - Differential
Sampling rate Event-dependent on reaching the response threshold
Response threshold 0.01mm
Units l/m²; mm; in; mil
Request channels:
UMB Chanel
Measurement Variable (float)
Unit
605
Precipitation Quantity - Differential
l/m²
625
Precipitation Quantity - Differential
mm
645
Precipitation Quantity - Differential
in
665
Precipitation Quantity - Differential
mil
Note: Each request from a differential channel sets the accumulated quantity back to zero. If
the response from the device is lost due to a transmission error (e.g. poor GPRS
connection), the quantity accumulated to date is also lost. The quantity accumulated to date
is also reset each time the equipment is rebooted.
6.14 Precipitation Intensity
Sampling rate 1 minute
Response threshold 0.6 mm/h
Units l/m²/h; mm/h; in/h; mil/h
Request channels:
UMB Channel
Measurement Variable (float)
Unit
800
Precipitation Intensity
l/m²/h
820
Precipitation Intensity
mm/h
840
Precipitation Intensity
in/h
860
Precipitation Intensity
mil/h
Note: The precipitation intensity is always calculated on the basis of the precipitation
intensity of the previous minute.

Operating Manual Compact Weather Station
18 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
6.15 Precipitation Type
Sampling rate Event-dependent on reaching the response threshold
Response threshold 0.01mm
Follow-up time 2 minutes
Request channels:
UMB Channel
Measurement Variable (unsigned char)
Coding
700
Precipitation Type
0 = No precipitation
60 = Liquid precipitation, e.g. rain
70 = Solid precipitation, e.g. snow
Note: A detected precipitation type remains valid for 2 minutes after the end of the
precipitation event. In order to record precipitation types which only occur for a short period
(e.g. short-term rain), the request time should be at least 1 minute.
Ice, hail and sleet are transmitted as rain (60).
6.16 Heating Temperature
Sampling Rate 1 Minute
Units °C; °F
Request Channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
Unit
112
Heating Temperature Wind Sensor
-50.0
150.0
°C
113
Heating Temperature Precipitation Sensor
-50.0
150.0
°C
117
Heating Temperature Wind Sensor
-58.0
302.0
°F
118
Heating Temperature Precipitation Sensor
-58.0
302.0
°F
6.17 Global Radiation
Sampling Rate 1 minute
Generation of average values 1 –10 minutes
Unit W/m²
Request Channels:
UMB Channel
Measuring Range
act
min
max
avg
Measurement Variable (float)
min
max
unit
900
920
940
960
Global Radiation
0.0
1400.0
W/m²

Operating Manual Compact Weather Station
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 19
Figure 2: Fastening to
the Mast
7 Installation
The sensor bracket is designed to be installed on the top of a mast with a diameter of 60 –
76mm.
The following tools are required for the installation:
Open-end or ring spanner (SW13)
Compass for aligning the wind meter to the North
7.1 Fastening
Loosen nuts
Push the sensor onto the top of the mast from above
Tighten the nuts evenly until contact is made with the springs but the sensor can still be
moved easily
Align the sensor to the North (for wind meters)
Tighten both nuts with 3 revolutions
Mast tube
Mounting bracket
Springs
Nuts with washers

Operating Manual Compact Weather Station
20 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
Figure 3: North
Markings
Figure 4: Alignment to
North
7.2 North Alignment
In order for the wind direction to display correctly, the
sensor must be aligned to the North. The sensor has a
number of directional arrows for this purpose.
Procedure:
If the sensor is already installed, first loosen both nuts evenly until you can turn the sensor
easily
Using the compass, identify the North and fix a point of reference on the horizon
Position the sensor in such a way that the South and North sensors are in alignment with
the fixed point of reference in the North
Tighten both nuts with 3 revolutions
poor good
Note: As the magnetic North Pole indicated by the compass differs from the Geographic
North Pole, account must be taken of the declination (variation) at the location when aligning
the sensor.
Depending on the location, the variation can be more than 15° (in North America for
example). In Central Europe the variation can be largely ignored at present (< 3°). You can
find further helpful information on this subject on the Internet.
Point of reference in the North