Reinhardt Sensors 55 User manual

Manual
MWS 55 / MWS 88-2 / MWS 10
Microprocessor Weather Station
and Sensors 55
with data logger (SD-card)
REINHARDT System- und
Messelectronic GmbH
Bergstr. 33, D-86911 Dießen-Obermühlhausen
Tel. 0049 - (0) 8196/934100 Fax 0049 - (0)8196/7005 or 1414
E-Mail: [email protected]
http://www.reinhardt-wetterstationen.de

REINHARDT System- und Messelectronic GmbH
Bergstr. 33 86911 Diessen-Obermühlhausen Postfach 12 41 D-86908 Diessen Tel. 08196 - 934100
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Table of contents
1 Caution .......................................................................................................................................................9
1.1 Intended Use..................................................................................................................................9
1.1.1 Storage...................................................................................................................................9
1.2 Safety Regulations .........................................................................................................................9
1.3 Mounting.........................................................................................................................................10
2 Setting Up the Weather Station................................................................................................................10
2.1 Installation of Hardware..................................................................................................................10
2.1.1 Overvoltage protection ...........................................................................................................11
2.2 Software Installation.......................................................................................................................12
2.3 Starting the Software......................................................................................................................13
Table of contents

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3 Technical details........................................................................................................................................14
3.1 The data logger ..............................................................................................................................14
3.2 In case of power failure ..................................................................................................................14
3.2.1 The internal clock (CAUTION!!) .............................................................................................14
3.2.1.1 Deactivation of Lithium cell when storing the MWS 55V for a longer time................14
3.2.2 Special version with SuperCap instead of Lithium cell -SCO.................................................15
3.2.3 Option SuperCap additional to Lithium cell -SC.....................................................................15
3.3 Maintenance...................................................................................................................................15
3.3.1 Cleaning the rain sensor ........................................................................................................15
3.4 The sensors....................................................................................................................................17
3.4.1 The Temperature Sensor .......................................................................................................17
3.4.2 The Humidity Sensor..............................................................................................................17
3.4.3 The Pressure Sensor .............................................................................................................17
3.4.4 The Wind Speed Sensor ........................................................................................................18
3.4.5 The Wind Direction Sensor ....................................................................................................18
3.4.6 Rain / Precipitation Sensor (MWS 10, otherwise optionally)..................................................18
3.3.7 Global Solar Radiation Sensor (MWS 10, otherwise optionally) ............................................18
3.4.8 Light Intensity Sensor (Lux-Sensor) (Option).........................................................................18
3.4.9 Ultraviolet-radiationsensor (UV-Sensor) (Option) ..................................................................19
3.4.10 Additional Sensor .................................................................................................................19
3.4.11 Connecting an Additional Sensor.........................................................................................19
3.5 Sensor Accuracy ............................................................................................................................20
3.5.1 Measuring Ranges .................................................................................................................20
3.5.2 Pulse output of RMS 55 TTL..................................................................................................20
3.6 Adjustment of Additional Sensors ..................................................................................................21
3.6.1 Save settings after change.....................................................................................................24
3.7 Firmware Update............................................................................................................................25
3.8 Power Supply .................................................................................................................................30
3.8.1 Power consumption................................................................................................................30
3.9 Heating device................................................................................................................................30
3.10 Data Format .................................................................................................................................31
3.10.1 Data access onto the SD-card .............................................................................................32
3.10.1.1 Available commands: .............................................................................................33
3.10.1.2 Description of the commands ................................................................................33
3.10.1.3 Saving settings onto the SD-card ...........................................................................35
3.10.1.4 Load settings from the SD-card ..............................................................................35
3.10.1.5 Access to the SD-card via FTP...............................................................................35
3.11 System requirements ...................................................................................................................35

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4 Connections and Pin assignments..........................................................................................................36
4.1 Cables ............................................................................................................................................36
4.1.1 Data Cable - Allocation of the Connection Cable for MWS 55...............................................36
4.1.1.1 Connection Diagram Standard data cable ...............................................................36
4.1.2 Allocation of the Connection Cable for MWS Heating............................................................37
4.1.2.1 Connection Diagram Cable for heating device .........................................................37
4.1.3 Allocation of the Connection Cable for GPS-Receiver (Garmin GPS 18x LVC) : ..................37
4.1.4 Allocation of the Connection Cable for Heating and GPS-Receiver (Garmin GPS18x LVC): 38
4.1.5 Allocation of the Connection Cable for Sensors with RS422-port..........................................38
4.1.6 Allocation of the 1:1 cable for sensors with RS232-port ........................................................39
4.1.6 Allocation of the 1:1 cable for Sensors with RS422-port........................................................39
4.2 Pin assignments.............................................................................................................................40
4.2.1 Allocation of the MWS 55-Connection Sockets......................................................................40
4.2.1.1 Allocation of the RMS 55 TTL-Connection Sockets ............................................................41
4.2.2 Bottom side of weather station MWS 55 / MWS 88-2 (connectors) .......................................42
4.2.2.1 Bottom side of RMS 55 TTL (connectors)...........................................................................43
4.2.3 Bottom side of weather station MWS 10 (connectors) ...........................................................45
4.3 USB-Port ........................................................................................................................................46
4.3.1 Installing the USB driver.........................................................................................................46
4.3.2 Problems with the USB Port...................................................................................................47
4.3.2.1 USB-Device was not recognized ..............................................................................47
4.3.2.2 Microsoft Ballpoint instead of MWS USB Virtual COM .............................................48
4.3.3 Clean up used COM-Port numbers........................................................................................49
4.4 TCP/IP-Port with PoE.....................................................................................................................51
4.4.1 Reading the data logger over PoE (TCP/IP) ..........................................................................51
4.4.2 Accessing the SD-card via FTP .............................................................................................51
4.4.2.1 Access via FTP with FileZilla ....................................................................................53
4.4.3 WEB-Server ...........................................................................................................................55
4.4.3.1 Password and HTPASS folder..................................................................................58
4.4.3.2 Creating WEB sites...................................................................................................59
4.4.3.3 WEB-Page - current Data .........................................................................................60
4.4.3.4 WEB-Page - current Data 2 ......................................................................................60
4.4.3.5 WEB-Page - Min / max .............................................................................................61
4.4.3.6 WEB-Page - Ethernet ...............................................................................................61
4.4.3.7 WEB-Page - Station..................................................................................................62
4.4.3.8 WEB-Page - Sensor configuration ............................................................................62
4.4.3.9 WEB-Page - Terminal ...............................................................................................63
4.4.3.10 HTML-Templates und POST-commands................................................................64
4.4.3.10.1 Templates 64
4.4.3.10.2 POST-commands 70
4.4.4 Pin assignments of the PoE connector ..................................................................................72
4.4.5 Problems with data transmission via TCP/IP and PoE ..........................................................73
4.5 Wireless LAN (WLAN) built-in ........................................................................................................74
4.5.1 Settings for WLAN Option via WEB-Interface ........................................................................74
4.5.2 WEB-Interface of xPico WLAN-module..................................................................................74
4.5.3 Basic settings for the WLAN option via serial interface (CLI).................................................75
4.5.4 Basic settings for the WLAN option via XML..........................................................................76
4.5.5 Parallel operation via WLAN and serial interface...................................................................77

REINHARDT System- und Messelectronic GmbH
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5 Excerpts from the Directions of DWD for Automatic Weather Stations...............................................78
6 Trouble Shooting.......................................................................................................................................79
6.1 Transfer problems ..........................................................................................................................79
6.1.1 Allowed cable lengths ............................................................................................................79
6.2 No data / wrong baud rate..............................................................................................................79
6.2.1 Diagnostic connector for testing the data cable .....................................................................80
6.3 RS422/RS485 interface..................................................................................................................81
6.4 Protocol-files (weather32 software)................................................................................................83
6.4.1 Fault Log ................................................................................................................................83
6.4.2 Log-file in case of error (ErrLog.txt) .......................................................................................84
6.4.3 Logfile when starting up (log.dat) ...........................................................................................84
6.4.4 Show output (internal) ............................................................................................................84
6.5 Problem with Mobotix Cameras .....................................................................................................84
7 Options.......................................................................................................................................................85
7.1 Switching outputs ...........................................................................................................................85
7.2 Available displays...........................................................................................................................87
7.2.1 Meteograph ............................................................................................................................87
7.2.2 DKA1......................................................................................................................................87
7.2.3 DMMK ....................................................................................................................................87
7.3 GPS-Receiver ................................................................................................................................87

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8 Technical Appendix...................................................................................................................................88
8.1 Control parameters for calibrating an additional sensor.................................................................88
8.2 Controlling the Microcontroller........................................................................................................89
8.2.1 Input parameters of MWS 55 -Microcontroller .......................................................................89
(Excerpt from the instruction set - The most important commands) ...............................................89
8.2.1.1 Input-Flags, GPS & timer options .............................................................................90
8.2.1.2 Controlling the output & storage format ....................................................................91
8.2.1.3 Linearisation / calibration data ..................................................................................94
8.2.1.4 Protocoll-Select (CAUTION) .....................................................................................95
8.2.1.5 Date / time / storage settings ....................................................................................98
8.2.1.6 Activate / deactivate the internal Lithium cell ............................................................99
8.2.1.7 Setting the switching outputs ....................................................................................99
8.2.2 SECURE-Mode ......................................................................................................................99
8.2.3 Requesting the microcontroller ..............................................................................................100
8.2.4 Meaning of the listing with !?0................................................................................................105
8.2.5 Order of the MWS 55 Sensors ...............................................................................................107
8.2.6 Listing of current sensors .......................................................................................................111
8.2.7 Detailed information of each sensor.......................................................................................112
8.3 Ethernet Port ..................................................................................................................................113
8.3.1 Administrator ..........................................................................................................................113
8.3.2 Setting the Station's IP address .............................................................................................114
8.3.3 Setting an ADMIN address and an ADMIN password............................................................114
8.3.4 Deleting the Administrator......................................................................................................115
8.3.5 Closing connections ...............................................................................................................115
8.3.6 Set access addresses and authorizations..............................................................................116
8.3.7 Changing the port number .....................................................................................................120
8.4 Access permissions........................................................................................................................121
8.5 Plain text commands......................................................................................................................122
8.5.1 Listing of plain text commands...............................................................................................122
8.5.2 Tree of plain text commands..................................................................................................132
9 Instructions for Mounting.........................................................................................................................134
9.1 Mounting MWS 55..........................................................................................................................134
9.1 Mounting MWS 10..........................................................................................................................138
10 Packing MWS 55 properly.......................................................................................................................140
11 Exchange Connectors.............................................................................................................................141

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MWS 10

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MWS 55 / WDS 55 MWS 88-2
RMS 55
DFT 55
GSS 55

REINHARDT System- und Messelectronic GmbH
Bergstr. 33 86911 Diessen-Obermühlhausen Postfach 12 41 D-86908 Diessen Tel. 08196 - 934100
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1 Caution
1.1 Intended Use
REINHARDT-Weather stations MWS 55, MWS 88-2 and MWS 10 and Sensors 55 (hereinafter
referred to as MWS 55) are exclusively built for stationary operation on a fixed 1" pipe for auto-
matically collecting climatic parameters outside.
Any use other than described above may cause damage of the product or lead to other dangers.
Do not mount the weather station in reach of children and pets.
Carefully read the complete operating manual. It contains important information about the in-
stallation and operation.
If the MWS 55 is not used for a longer period of time you should store it lying to prevent escaping
the lubricant from the ball bearings!
1.1.1 Storage
CAUTION: If the MWS 55 ist not put into operation immediately after receipt, it must be stored
in a well ventillated place! The MWS 55 must not be stored in a package for a longer time for
all packing materials are emitting solvents which leads to drift of the humidity sensor and the
humidity measurement drifts out of specification!!
See: Sensirion_Humidity_Sensors_Handling_Instructions.pdf or here: https://www.sensirion.com/
fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Application_Note/
Sensirion_Humidity_Sensors_Handling_Instructions.pdf
Please also note that the internal backup battery for the clock discharges when the unit is not
used for a longer time! See also here.
1.2 Safety Regulations
The instruments are manufactured according to modern technical standards and can be operated
without danger when used as directed.
Damage caused by non-observance of this operating manual can lead to forfeiture of warranty.
We shall not assume any liability for subsequent damage.
We shall not assume any liability for damage of items or persons caused by improper handling
or non-observance of the safety instructions! In such cases any guarantee claims shall become
null and void.
Dear customer, the following safety and hazard notices not only serve the protection of your health
but also the protection of the appliance. Please read the following points carefully.
The supply voltage is converted by isolated transformers into voltages of maximum 24VDC.
(The stations can be operated at voltages up to 28VDC).
Please do only use the supplied power supply units.
The weather station includes pointed and sharp-edged parts (i.e. windvane and edges of the
sensor's housing), which may cause injuries when handled without care.
Do not leave the packaging material lying around. These parts are dangerous toys in the hands
of children.
Handle the product with care. Blows or impact, or dropping it even from a small heigth will da-
mage it.

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1.3 Mounting
The weather station is mounted on a 1" water-pipe. This pipe must be fixed very well to stand
high wind speeds above 200 km/h when the weather station is mounted.
The weather station is to be fixed well onto the 1" pipe with the screws. The stability of the weather
station on the pipe must be established. Really check this after mounting the weather station!
Please mount the weather station on a place you easy can reach for mainte-
nance purposes for the station can not be guaranteed to be absolutely mainte-
nance free, i.e. the precipitaion sensor needs to be cleaned regularly (MWS10)!!!!
Take care that no water can splash onto the MWS 55 from below. Otherwise water may
soak into the MWS 55 and damage the weather station!!
You'll also find advice for mounting the weather station on your Weather-USB-Stick.
2 Setting Up the Weather Station
2.1 Installation of Hardware
MWS 55 Weather Station has been designed for measuring the most important weather para-
meters temperature, humidity, barometric pressure, wind direction, wind speed and precipitaion
and global solar radiation (MWS 10).
All parameters can be displayed graphically, digitally or as an "multiple display".
There is also a statistics and a history function.
Mount the weather station on a 1 " pipe. Orient the North-marker to North and clamp MWS 55
in place with the two pre-mounted high quality steel screws. Take care that the pipe is mounted
as perpendicularly as possible, otherwise the windvane will not work properly and will preferably
rotate in one direction.
N.B.
The wind vanes of the MWS 55 weather station are very sensitive sensory equipment which can
easily be destroyed by mechanical influence.
Therefore do keep the packing of your weather station. Whenever you want to ship your weather
station later, this packing guarantees that the weather station is not damaged in transport !! Time
and again we have noticed that the units are damaged by wrong packing. This is very annoying
for the customer because he has to pay for all costs that may arise.
Please ask for a quotation of an original packing if it is no longer available to you
(see packing MWS 55).
The weather station must be set up at a place which is exposed to wind, because otherwise wind
direction and wind speed cannot be measured correctly. (Please see "Directions of Deutscher
Wetterdienst").
It is also important, that no water is splattering onto the MWS 55 from below!
Connect the enclosed cable as follows:
Connect the 9pole connector to a free serial interface of your PC or to an USB port with a suitable
COM to USB converter (with driver software which creates a virtual COM port).
Plug the power supply into a power outlet 100-240VAC / 50-60Hz.
Another option is PoE which allows supplying the MWS 55 via the network cable.
Power supply with PoE does not supply the the optional heating device. The heating device is
supplied with an extra cable and own power supply!

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Note on Security
Please note that you must in any case use the power supplies which we have provided with your
MWS 55 weather station or which are technically identical. Nominal value must be between 4 V
and 28 V DC voltage; it must be possible to apply at least 100 mA (with optional heating element
another 18 or 24VDC 1 A). Please note also that all the power supplies we provide are only made
for use in dry rooms.
The 7 pole plug is connected to the Power / data socket of the weather station.
There are other sockets for additional sensors, for the power supply of a heating device and for
an optional GPS-receiver. Power supply of the additional sensors can be provided by the weather
station or by their own power supply. The output voltage of the additional sensors must not exceed
+4.095 V, sensors with pulse output must be TTL-compatible.
To pin assignments of MWS 55 connectors.
IMPORTANT !
When removing any additional cables from the weather station, please don't forget to protect the
socket with the cap and don't leave the socket open. Otherwise the contacts of the socket will start
corroding and be damaged within a short period of time!
Also don't forget to protect the plug of the cable from moisture by covering it when removing the
weather station for calibration i.e. In this case also remove the wall adaptor of the power supply to
ensure that no voltage is applied to the contacts of the weather station's plug when it is not used!
Otherwise the plug will start corroding due to moisture and the cable has to be replaced within a
short period of time.
2.1.1 Overvoltage protection
The MWS 55 contains an integrated overvoltage protection (Suppressordiods) at it's supply- and
data wires.
The power linie is protected by a SMCJ26CA-diode. This diode breaks through at voltages above
31VDC and is able to carry up to 1500W for a few milli seconds.
CAUTION: If you connect voltages above 30VDC permanently to the power jack, this
diode will be destroyed within a few seconds!
The data lines are protected by SMBJ15CA-diodes able to carry transients up to 600W.
Also the housing made of high quality steel is connected to system ground.
This protection is suitable for protecting the station from damage due to overvoltage at close
lightning strikes.
For protection of the connected peripherals (computer, camera, i.e.) the customer has to take
further precautions (line protection, opto couplers, i.e.).
But please note that this protection is ineffective in case of direct lightning strike
due to extremely high energy of lightning!
Currents of up to 200.000A can cause voltages up to 20.000V on the housing which
leads to flashovers onto the internal electronic components and its destruction.

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After installing the hardware you install the software.
2.2 Software Installation
Connect the Weather-USB-Stick CD to a USB port of your computer.
You need an HTML-capable browser (Netscape, Internet-Explorer or else).
Then execute STARTER.EXE in the Weather-USB-Stick's root directory.
Now you follow the further instructions.
Note
The weather 32 software creates the HKEY_CURRENT_USER\Software\ReinhardtGmbH\Wet-
ter\... key in the registry which is only created when running and is not deleted when the software
is uninstalled.
After the software has been installed you connect the 7-pole plug to the POWER connector of the
MWS 55. To perform please loosen the 3 lateral screws and turn the radiation shield to the right.
Now you can pull the radiation shield completely downwards to reach the connectors of the MWS
55. After connecting the cable please remount the radiation shield.
See also the mounting hints on the Weather-USB-Stick!

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2.3 Starting the Software
Start the software by double-clicking the program icon.
After every start, the software checks the clock of MWS 55 and compares it to your computer clock.
If it differs more than set in the file WEATHER32STATION.INI the software sets the MWS 55
clock automatically. Needless to say, the clock of the connected PC must give the correct time, as
MWS 55 is set to the PC-clock.
Additionally the software sets the storage interval (!Zxx) and the reset hour for precipitation (!Rxx)
at each start up. These values are also stored in the WEATHER32STATION.INI.
If your MWS 55 holds a GPS-receiver, it provides the correct time for MWS 55 (UTC time).
NOTE
In this case the weather station's clock CAN'T be set by the software! With the GPS receiver you
start the software with the parameter -GPS (See software manual) for otherwise there may be
problems showing and storing data due to wrong time synchronisation!
Data recording to hard disk is started in the selected time interval (60 seconds by default). The
software should run for at least one memory interval so that at least one data file is stored on the
hard disk. This is important for reading out the datalogger later. (If there is no data file on the
hard disk, the datalogger cannot be read out as the software does not find a start date.)
NOTE
MWS 55 only starts recording data to its datalogger after the time has been set. This guarantees
that the datalogger holds only data with the correct time. The clock of the weather station is preset
to CET when delivered. If your local time is different please ensure to set the correct timezone when
using a GPS-receiver at the first start!
(See commands under - Controlling the micro controller. (!ZZ)).
The MWS 55 has an internal Lithium cell supplying the clock so that storing of data is performed
immediately after connecting a power supply without the need to set the clock before logging.
The MWS 10 contains an additional accu pack to ensure that measuring continues up to 4 hours
without external power supply. This accu pack is reloaded automatically in normal operation.
CAUTION: When the MWS 10 is not used and no external power supply is applied it is essential
to remove the power cable from the MWS 10 for otherwise the internal accu block is discharged
completely and may be destroyed!
When using a GPS-receiver for setting the clock there may occur different problems, i.e. when the
software tries to set the clock! (See FAQ on the weather-USB-Stick)
If the software is not started, there might be a faulty data file on the hard disk or not enough free
memory. This causes an abort.
The manual for the latest software you'll find here or on our WEB site.

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3 Technical details
3.1 The data logger
The data logger of the MWS 55 has got an internal SD-Card with 8GB.
When storing data with an interval of 10 seconds the device stores 267840 data sets a month (31
days). With 15 active sensors (clock and date also counts as a sensor) the monthly data file has
a size of app. 31.5 MB.
So there are app. 375MB of data a year which allows storing of data for more than 20 years wit-
hout the need of deleting any data.
The data files are stored on the SD-card in the folder "/log/data".
Each month a new data file is being created which contains the month and the year in it's name.
The file suffix is "mws".
The name of the data file of march 2015 therefore is 03_2015.mws.
The data file are ASCII files (text files).
The SD-card contains other files important for operating the weather station. These files must
not be deleted or edited.
3.2 In case of power failure
The datalogger of MWS 55 is kept up in case of power failure (EEPROMS), but no new data are
stored.
The MWS 10 keeps running up to 4 hours after power loss if the internal accu block was fully
charged.
In case of power failure, the clock of MWS 55 is kept running and doesn't need to be set when
power is applied again!
Due to power failure there are data missing in the data files (time gaps). These gaps are filled
with dummy values (-99999) by the weather32 software when reading the logger.
So missing data are indicated by measure values of -99999 in the datafile. The software then re-
cognizes in the values of -99999 that data are missing and creates a gap in the graphical displays.
3.2.1 The internal clock (CAUTION!!)
The MWS 55 has a batterie powered clock eliminating the need to use a computer or GPS-receiver
to start a measurement with data logging.
Please note that the batterie discharges when the MWS 55 is not used. When storing the MWS
55 without power supply for app. 9 months the batterie (Lithium cell CD3032) is empty and must
be replaced!
To perform this the housing of the MWS 55 has to be opened.
3.2.1.1 Deactivation of Lithium cell when storing the MWS 55V for a longer time
Since board version 1.057 buffering the internal clock by the Lithium cell can be switched off to
avoid discharging the Lithium cell.
This also is the delivered condition! That's why the clock needs to be set after the first
start to ensure proper storage of data! When applying power to the unit the Lithium
cell is activated automatically!
If you want to store the MWS 55V for a longer time without power applied you should
deactivate the Lithium cell!
The command for deactivation of the Lithium cell is: *ADMIN POWER REMOVE
To activate the Lithium cell use the command: *ADMIN POWER MOUNT

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3.2.2 Special version with SuperCap instead of Lithium cell -SCO
For the Lithium cell discharges within 9 months when the MWS 55V is not used (storage without
power supply) we offer a special version with SuperCap (5F) instead of the Lithium cell. This
SuperCap is fully charged within 5 hours after power is applied to the MWS 55V and then is able
to buffer the internal clock of MWS 55V up to 5 days without power applied to the MWS 55V.
If the MWS 55V was without power for more than 5 days, the SuperCap has discharged
and the clock of MWS 55V needs to be set after applying power for proper data storage
into the logger (either manually or with the weather32 software).
3.2.3 Option SuperCap additional to Lithium cell -SC
There is an option with additionally SuperCap parallel to the Lithium cell. Here the SuperCap
is used to extend the lifetime of the Lithium cell when the MWS 55V is used only sometimes and
is not used at the weekends for example.
3.3 Maintenance
Because of its elaborated sensors, MWS 55 needs no maintenance.
There are wear parts like the ball bearings and the fan which have to be replaced from time to time.
These parts have got a life time of app. 5-6 years under normal environment conditions.
Extreme conditions (operation directly at the sea, high mountin regions, extreme pollution, i.e.)
may cause very reduced life time of these parts.
MWS 55 weather station has been developed for stationary use under normal climatic conditions
(temperate zone). Use under extreme conditions such as e.g. on board of a ship, mobile use on a
measuring vehicle etc. has not been tested. It is therefore not recommended to set up the weather
station where it is exposed to salt or salt water ( e.g. right at the coast etc.).
It can be used on a measuring car under certain conditions although the measured values of the
wind sensors cannot be reproduced.
Our warranty ends if there is any intervention into hardware or software from your side.
3.3.1 Cleaning the rain sensor
To clean the rain sensor remove dirt (leafs, bird dropping, i.e.) from the funnel.
Make sure that the droplet outlet in the center of the funnel cover is not blocked!
For cleaning the seesaw perform as shown in the following images.

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The rain sensor should be checked regularly for dirt and insect infestation on the seesaw to ensure
that it is working properly at all times! Depending on the surrounding vegetation and occurrence
of spiders, wasps, etc., this should be done weekly, but at least monthly!
Below you can see 2 examples of dirty rain sensors!

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3.4 The sensors
3.4.1 The Temperature Sensor
Temperature measurement is based on a precision precalibrated sensor SHT25 from Sensirion.
The values are read internally via a I²C bus. The resulting measured value is additionally linea-
rised by the weather station.
By standard, the temperature sensor is mounted on the lower side of the weather station. A white
lacquered pagoda protects against radiation and prevents a buildup of heat.
Range: from -40 °C to + 60 °C, measuring accuracy ± 0.3 °C, (display also possible in Kelvin or
°Fahrenheit)
CAUTION: Compared to temperature measurements in big shielded cabins the measured values
can be higher when the sun is shining. If the temperature measurements must correlate with the
measurements in big shielded cabins you should measure temperature in the shadow or measure
with an additional temperature sensor placed in the shadow or in a big shielded cabin!
Unit: [°C]
3.4.2 The Humidity Sensor
is also based on a precision precalibrated sensor SHT25 from Sensirion. The values are read in-
ternally via a I²C bus. The resulting measured value is additionally linearised and compensated
by the weather station. The sensor is also mounted on the lower side of the weather station. A
Gore-Tex cover protects it from pollution or destruction by dust or insects.
The humidity sensor can be used in a temperature range between -40 °C to + 60 °C. It is linearized
to an accuracy of 2 %.
Range: from 10 to 100 %, measuring accuracy ±2 %, display also as dewpoint measurement in
°C or °F
NOTE
This sensor is very responsive to static charge and air pollution (dust, aggressive gases, but also salt).
Please note that under unfavourable conditions (i.e. microbic stress caused by moulds, bacteria)
this sensor ages faster than under normal conditions. Also see: here (Storage)
Unit: [%]
3.4.3 The Pressure Sensor
is a precalibrated digital sensor from Bosch (BMP180/BMP280) which is read internally via a I²C
bus. This sensor already is linearized to 4 hPa for the whole temperature range, the barometer is
temperature compensated. Another temperature linearisation reduces the deviation to less than
2 hPa over the whole temperature range.
The sensor can be used in the temperature range of -40 °C to + 60 °C.
Measuring range: from 300 hPa to 1100 hPa with ± 0.8 hPa accuracy. Display can be reduced to
0 m above sea level (input of the local altitude in [m], display also in mm mercury column or Inch
mercury column).
An additional output of barometric pressure (reduced to sea level) is possible. 3 different formulas
are predefined within the weather station (simple formula, international barometric formula and
barometric formula of DWD considering temperature and humidity).
Further formulas you may use within the weather32 software.
This sensor can be transported by air cargo!
Unit: [hPa]

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3.4.4 The Wind Speed Sensor
is a three-shell anemometer with optical scanning. The wind speed is measured without contact
via a hybrid light barrier using a serrated washer with 12 notches. A peak detector finds every
wind peak and hands them on the measuring software. An average value is determined within
the respective memory intervals.
Range: in km/h from 0 to 200 km/h with ± 2.5km/h measuring accuracy, (display also in m/s,
miles/h, Knot or Beaufort), starting speed < 0.8 m/s.
As we have a very comfortable, 3-fold way of measuring wind speed with current wind speed
(WG), average wind speed (WD) and wind peaks (WS), you can conform your wind measurement
to your very needs.
Please note that dependent on the current winds, the 3 different methods of measuring wind
speed can result in very differing graphs: When measuring WG, only a current value is written
in the selected measuring interval, when measuring WD and WS, there is continuous evaluation
and the whole measuring period is monitored.
Unit: [km/h]
3.4.5 The Wind Direction Sensor
There is a weather vane with a precision magnetical encoder and a rotation angle of 360 ° for
measuring wind direction. Wind direction is given in °, with 90° being East, 180° being South,
270° being West and 0 ° being North.
Range: in 360 °, measuring accuracy 5 °, starting speed, < 0.8 m/s, hysteresis < 8°.
Output is performed as WR (current winddirection) and WV (main wind direction within a storage
interval). The value of WV at wind speed (WG) = 0 is -99997!
This indicates that a calculation of main wind direction is not possible, when wind speed is = 0.
Unit: [°]
3.4.6 Rain / Precipitation Sensor (MWS 10, otherwise optionally)
A self-emptying bucket is tilted by the collected rain. All the water that has been collected on
the normed area of 200 cm2is led through a funnel to the bucket. The bucket tilts whenever a
certain quantity of water has been collected. The tilting creates pulses which are counted. Out of
the pulses, the software calculates the rain that has fallen per m2. The current intensity of rain
is also found and displayed. Unit: [mm] [l/m²]
Range: from 0 to 5000 ltr/m2,
Measuring accuracy ± 0.2 ltr/m2
3.3.7 Global Solar Radiation Sensor (MWS 10, otherwise optionally)
This is a pyranometer which absorbs radiation between 305 and 2800 nm. The temperature of a
black and a reflecting element is subtracted and linearised by the software. The measuring sensor
is a thernmo element.
The values are edited in W/m2.
The measured value reaches 90 % of its final value after about 90 seconds.
Unit [W/m²]
Range: from 0 to 1300 W/m2with ±40 W/m2accuracy at 25°C.
3.4.8 Light Intensity Sensor (Lux-Sensor) (Option)
measures light intensity in Lux. Measuring range is within the human eye response.
Range: from 0 to 220000 lx
Measuring resolution: 4 lux

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3.4.9 Ultraviolet-radiationsensor (UV-Sensor) (Option)
measures ultraviolet radiation (UV-A) in mW/m². The spectral range is 320nm..395nm.
Range: 0 to 50000 mW/m²
Measuring accuracy: +/-10%
3.4.10 Additional Sensor
Any kind of sensors can be integrated as additional sensors. The information signal must be
applied as voltage in the range between 0 V and + 4.095 V or it has to be adapted to MWS 55 by
a special amplifier. Negative or higher voltages are blocked, but out of security reasons, should
be avoided in any case!
The signals are linearized with up to 8 programmable inpterpolation value pairs by the MWS 55.
We can deliver a temperature sensor for measuring the soil or water temperature and a sensor
for measuring the temperature of the road surface.
The MWS 55 can be equipped with an input for current signals (0..20mA). The signal of the cur-
rent input is applied to pin6 and pin7 of the additional sensors socket. The sensors output has the
sensor identifier ZC in that case sensor ZB can't be used in paralled to the current measurment!
Additional sensors can be voltage supplied by the weather station as long as their current con-
sumption is below 100 mA.
NOTE
If current consumption exceeds this value, we cannot grant that MWS 55 weather station works
properly !!!
If they need higher currents, the sensors must have an external power supply and its ground has
to be connected to the MWS 55-ground (Pin 1 of the 8-pole connector socket).
You can call for adjustment instructions of the additional inputs at any time.
3.4.11 Connecting an Additional Sensor
Additional sensors are connected to MWS 55 at the 8-pole socket.
The socket is allocated as follows:
Pin1 : GND
Pin2 : Input for precipitation sensor (TTL-pulse) - MWS 55, MWS 88-2, Sensors 55
Pin2 : Input for TTL-pulses - MWS 10
Pin3 : Input for analog additional sensor 4 (0..4.095V)
Pin4 : Input for analog additional sensor 5 (0..4.095V)
Pin5 : Input for analog additional sensor 1 (0..4.095V)
Pin6 : Input for analog additional sensor 2 (0..4.095V)
(option: I- for current input 0..20mA)
Pin7 : Input for analog additional sensor 3 (0..4.095V)
(option: I+ for current input 0..20mA)
Pin8 : Output operating voltage (9..28VDC) maximum 100mA

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3.5 Sensor Accuracy
Temperature: ± 0.3 °C
Humidity: ± 2.0 % (at 10°C..35°C)
Pressure: ± 0.8 hPa (at 0°C..50°C), ±2 hPa below 0°C
Rain/precipitation: ± 0.2 mm
Wind direction: ± 5° (at 5°C..50°C), hysteresis < 8°
Start speed: < 0.5m/s (at 5°C..50°C)
Wind speed: ± 2.5 km/h (at 5°C..50°C)
Start speed: < 0.5 m/s (at 5°C..50°C)
Global radiation: +/- 40W (at 25°C)
UV-radiation: +/- 10%
Light intensity: +/- 6%
Additional analogue inputs: ± 3mV (at 0°C..50°C)
3.5.1 Measuring Ranges
Temperature: from -40 ° to + 60 °, resolution 0.01 °
Relative humidity: from 0 to 100 % resolution 0.03 %
Dewpoint: from -40 ° to + 60 °, resolution 0.01 °
Barometric pressure: from 950 hPa to 1050 hPa in 0.01 hPa resolution
Absolute pressure: from 300 hPa to 1100hPa in 0.01 hPa resolution
Precipitation: from 0 to 5000 mm with 0.1mm resolution
Wind direction: 0 to 360 °, resolution 0.025 °
Wind speed: in km/h from 0 to 200 km/h with 0.01 km/h resolution
Global radiaion from 0 to 1300 W/m² (Spectral range 0.3..2.8µm)
Light intensity: from 0 to 220000 Lux (Spectral range: human eye response)
UV-radiation: from 0 to 50000 mW/m² (Spectral range 320..395nm)
Additional inputs: 0- 4.095 V
Supply 4-28 V, 150 mA at 18 VDC, standard equipment
Dimensions
Size: Outer diameter 90 mm, height 240 mm (MWS 55)
Size: Outer diameter 240 mm, height 215 mm (MWS 10)
Weight: app. 1.05 kg (MWS 55)
Weight: app. 2.9 kg (MWS 10)
Weight: app. 800 g (10m ready made cable with PSU)
The housing must be mounted centrally on a 1" pipe.
Standard cabling is 10 m - longer cabling on request.
3.5.2 Pulse output of RMS 55 TTL
The output pulses of RMS 55 TTL look like that:
Pulse width app. 5ms, lo pulse.
This sensor is also available with positive output pulses.