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1. Sensor Interface WIND SPEED amp DIRECTION INDICATORS User Manual WIND SPEED amp DIRECTION INDICATORS Introduction User Manual Standard Interfacing RS 232 9 V 4800 baud 8 data 1 stop bit no parity as per wind direction sensor output load 3 kQ minimum RS 485 RS 422 Differential output 5 V no load 1 5 V minimum RS 485 2 V minimum RS 422 Once connected operate the monitoring system as decribed in the relevant system operating instructions Page 14 of 16 1 INTRODUCTION Performance and reliability are the key characteristics of these wind speed and direction sensors from Casella CEL Competitively priced for OEM users these high quality sensors are housed within compact units that can be used in conjunction with each other via a wind sensor interface module Both meet Meteorological and WMO requirements Harsh environmental conditions present no problem to the units they re manufactured from anodised aluminium The Casella Anemometer and Windvane are professional sensors intended to provide reliable and accurate measurement of wind speed and direction combining traditional Casella quality with modern electronics They have been developed to offer very smooth and reliable mechanical operation with a minimum of maintenance The rotational speed of the Anemometer is monitored using a non contacting design that provides an output directly proportional to wind speeds up to 75 m se
2. Wind Direction WIND SPEED amp DIRECTION INDICATORS User Manual WIND SPEED amp DIRECTION INDICATORS November 2002 User Manual 6 3 Order List When ordering from this list please quote the catalogue reference number 178031C Anemometer standard 178032C Anemometer standard Heater 178033C Anemometer standard Conduit 178034C Anemometer standard Heater Conduit 178035C Windvane standard 178036C Windvane Heater 178037C Windvane Conduit 178038C Windvane Heater Conduit 178050B Sensor Interface Module Each sensor is supplied complete with a 01 178015A Mounting Bracket ALTERATION WITHOUT NOTICE Please note that the contents of this manual may be subject to alteration without notice Page 16 of 16 ANEMOMETER amp WINDVANE Wind Speed amp Direction Sensors User Handbook HB 3276 03 COPYRIGHT The copyright in this document which contains proprietary information is vested in CASELLA CEL LIMITED The contents of this document must not be used for purposes other than that for which it has been supplied or reproduced or disclosed wholly or in part without the prior written permission of CASELLA CEL LIMITED CASELLA CEL CASELLA CEL Regent House 17 Old Nashua Road 15 Wolseley Road Amherst Kempston NH 03031 Bedford MK42 7JY U K U S A Phone 44 0 1234 844 100 Toll Free 1 800 366 2966 Fax 44 0 1234 841 490 Fax 1 603 672 8053 E mail info casellacel com E mail in
3. Table 2 SKT2 Wind Direction Pin Number Application Colour 1 NMEA Output Green 2 Signal Ground 3 Direction In Yellow 4 Signal Ground White 5 V in 6 28 V Red 6 Power Ground Black 7 Shield Ground Yellow Green 8 Speed In Blue Table 3 SKT3 Output Pin Number Application Direction Out 4 20 mA Signal Ground Speed Out 4 20 mA Signal Ground RS 485 Channel B Comms Ground RS 485 Channel A RS 232 Out Shield Ground Jo JN M Jor B JN Page 12 of 16 2 1 Heater Wiring Brown 24V Blue OV Yel Grn Screen Signal Wiring Red VIn 6 28V Blue OV Yellow O P Pulse Yel Grn Screen 01071 Figure 2 Connections for anemometer versions with heaters Anemometer Specifications Transducer type Maximum wind speed Starting velocity Distance constant Time constant Output calibration Resolution Output signal Pulses revolution Non linearity Accuracy Supply voltage Power consumption Stabilisation time Operating temperature Heater option Connecting cable Conduit Optical interrupter 75 m s Typically 0 3 m s 3 5 m s Typically lt 0 5 s 12 75 Hz m s 7 84 cm 0 5 V pulses 20 lt 0 6 0 3 m s below 3 m s 1 over 3 m s 6 to 28 V DC 3 mA lt 1 s from power up 20 to 70 C 24V DC AC 100 9 6 W 4 5 m without conduit 3 25 m with conduit 2
4. 55 m Page 5 of 16 Wind Direction WIND SPEED amp DIRECTION INDICATORS User Manual WIND SPEED amp DIRECTION INDICATORS Sensor Interface User Manual 3 WINDVANE WIND DIRECTION SENSOR The Windvane is a small IK 144mm gt lightweight GMR design X that offers a rapid response to changes in wind direction The analog output l changes from 0 to 1 8 V as 01 178015A Bracket ig 148 mm the wind direction changes from 0 to 359 5mm diameter stud sensors are connected x together as described in Signal Wiring g An NMEA output enables direct connection of sensors A A to the Casella Multimet L display system When the 49 mm Chapter 5 the digital output Red VIn 6 28V message will contain both Sa os ae 3 ue pee speed and direction data Green NMEA Serial O P This output provides reliable Yellow Direction O P long distance digital 00054 White OV Signal transmission when used Yel Grn Screen ith th nsor interf i x with the ssensciintentace Figure 3 Wind vane wind direction sensor module Figure 3 shows the general arrangement of the standard wind direction sensor Versions are available with additional features as follows 178035C Windvane with 4 5 m cable 178036C Windvane plus heater and two 4 5 m cables 178037C Windvane with 3 25 m cable in a 2 55 m reinforced conduit 178038C Windvane plus heater and two 3 25 m cables in 2 55 m reinf
5. 33C 178037C 178034C FA fen 178038C kad bz af E BF 0 5VNMEA Serial l fo 0 5 V Pulse Signals 0 1 8 V Analog B SKT3 Sensor Outputs SKT4 Power y Power 6 28VDC oO O o NMEA 10 m Distance C O RS232 10m Distance Sensor l l RS 485 422 12 km Distance l l l l l COOCCOCOOOo 5 Interface Speed 4 20 MA jam Module Direction 4 20 mA H 1780508 Ground Return H bd lt jmi a g CA E o Oo amp d 2x24V12W Heater Power SKT1 Wind SKT2 Wind Speed Sensor Direction Sensor 00056 Figure 5 Connections for the anemometer and windvane Figure 5 illustrates the connection possibities for the various versions of the anemometer and windvane sensors Connect as appropriate to your system Page 11 of 16 WIND SPEED amp DIRECTION INDICATORS User Manual Installation WIND SPEED amp DIRECTION INDICATORS User Manual Wind Direction 4 MECHANICAL INSTALLATION 4 1 The Site A suitable site must be chosen for the sensors that is free from turbulence caused by trees buildings hills etc The site should not be sheltered so that the sensors do not record the true wind conditions Neither should the site be unduly exposed in a position such as on the crest of a steep hill where more than the average wind velocity is encountered In particular it should be noted that a roof does not provide suitable exposure unless the instrum
6. ameter arrangement of the 49 mm p stud standard wind speed r sensor j Versions are available with lg Cane 28 V additional features as Blue OV follows Yellow O P Pulse 00052 Yel Grn Screen Figure 1 Anemometer wind speed sensor 178031C Anemometer with 4 5 m cable 178032C Anemometer plus heater and two 4 5 m cables 178033C Anemometer with 3 25 m cable in a 2 55 m reinforced conduit 178034C Anemometer plus heater and two 3 25 m cables in 2 55 m reinforced conduits The main casing of the anemometer wind speed sensor has an M5 x 18 mm stud that can be used for fixing it to the mast top or to the bracket supplied for alternative mounting arrangements All sensors are delivered as standard with a mast Mounting Bracket with pre drilled 5 1 mm mounting holes for the sensors Whatever screwed adapter or flange is employed at the junction between anemometer and mast or bracket a locknut must be used for full security The standard model has a single gland and connecting cable with wires colour coded as shown in Figure 1 The models supplied with a heater have an additional gland and connecting cable for the heater supply This has connectors coded as shown in Figure 2 Page 4 of 16 Table 4 SKT4 Instrument Power Pin Number Application 1 V in 6 28 V 2 Power Ground 3 Shield Ground Notes 1 Shield Ground should be connected to Power Ground at the instrumen
7. c The output is suitable for feeding monitoring systems such as the Casella Automatic Weather Station The Windvane incorporates the very latest technology using a giant magneto resistive GMR sensor to offer accurate and frictionless sensing It has an electrical output proportional to the direction of the wind The output with no deadband at north is also suitable for feeding monitoring systems such as the Casella Automatic Weather Station In addition an NMEA serial output can be made available from the Windvane containing both wind direction and wind speed information updated four times per second When used with the Sensor Interface module reliable long distance communications can be provided Versions of both sensors are available with heaters with 2 55 m of conduit and with heater plus conduit Page 3 of 16 WIND SPEED amp DIRECTION INDICATORS Wind Speed WIND SPEED amp DIRECTION INDICATORS Sensor Interface User Manual User Manual 2 ANEMOMETER WIND SPEED SENSOR 10 Direction Out 0 1 8 V Th iti 11 Signal Ground e sensitive anemometer 12 Speed Out 0 2 V is based upon a three cup rotor design An infra red light source and optical sensor provide 20 pulses from 0 to 5 V per revolution 134mm es th 0 3 01 178015A The frequency of the pulses See d Bracket is directly proportional to the wind speed i vy Figure 1 shows the general A ie nani di
8. e the RS 232 output from the Interface Module Page 9 of 16
9. ed is low and weather conditions moderate it is estimated that six years life can be expected from the bearings With a higher than average wind velocity and a bad exposure for example near the sea then 4 to 5 years might be expected At the end of this time it is recommended that the bearings be replaced with new ones Consult Casella CEL Service Department 6 2 Service We recommend factory service by technicians trained and equipped to repair your instrumentation Casella CEL s in house service department offers a comprehensive range of repair and calibration services designed to effect a fast and efficient back up for all our products The Service Department is operated under the scope of our BSI registration for products manufactured by us We will however undertake the repair of other manufacturers equipment For further information please contact the service department at our Bedford headquarters We will be happy to provide quotations for individual repairs or provide annual maintenance under contract Should you wish factory repair assistance send your equipment in a package equivalent to the original packaging Insure to full value and ship pre paid Include a letter giving full details with your packing list Send to CASELLA CEL LIMITED Service Department Regent House Wolseley Road Kempston Bedford MK42 7JY United Kingdom If purchased outside of the United Kingdom please return to your distributor Page 15 of 16
10. ents are mounted well above it For example a pitched roof produces strong upward air movement whose strength varies with the direction of wind relative to the roof angle The ideal mounting is a tower mast or pole about 10 to 15 meters above the mean ground level This should be even higher if the ground is obstructed by trees buildings etc 3 1 Make sure the Windvane is correctly oriented towards north Use the two small recess markers in the base plate and the N marker on the instrument case to orient the Windvane towards north 4 2 The Mast When deciding on the type of mast to erect the following points should be considered X Restrict access to the mast to avoid interference and vandalism X Use adequate guy wires to stop vibration particularly of the top section XA Sometimes a mast may be shared with another user who has some other requirement than meteorology Note Page 10 of 16 pe iria zs 1 iJ Signal Wiring Heater Wiring Red VIn 6 28 V Black OV Brown 24V Blue OV Blue Speed P Yel Gtn Screen Green NMEA Serial O P Yellow Direction O P 01070 White 0 V Signal Yel Grn Screen Figure 4 Connections for Wind vane versions with heaters Windvane Specifications Transducer type Maximum wind speed Resolution Accuracy Aligning threshold Damping ratio Distance constant Undamped natural wavelength Repeatability Electrical angle Nominal output signal NMEA serial ou
11. ere higher accuracy is required an offset multiplier and voltage per degree can be determined for the sensor as described here 1 Rotate the windvane head until it gives the lowest direction yellow output reading for example 0 01 V This output indicates the direction of 0 north 2 Rotate the head to give the highest reading for example 1 785 V 3 Subtract the lowest reading from the highest to obtain the span For example 1 785 0 01 1 775 V 4 Divide the span by the 359 swept arc to obtain the voltage degree For example 1 775 359 0 00495 VP 4 95 mv 5 Similarly divide the arc by the span to obtain the multiplier For example 359 1 775 202 25 6 Obtain the offset by subtracting the lowest 0 output from 0 V i e just change the sign For example 0 0 01 0 01 V The example gives the following results Reading 4 95 mV Multiplier 202 25 Offset 0 01 V 3 3 RS 232 NMEA Record Output Format Each wind direction and speed output is the average of the last 4 x 250 ms readings i e a 1 second average over the last second This is calculated every 250 ms and is followed by a carriage return and newline character Every 500 ms the following NMEA type record is output WSD ddd ssss c where 16 characters output inc space commas and CR LF ddd 000 359 Direction degrees Ssss 00 0 99 9 or 100 to 999 wind speed in m s The maximum that can be displayed is a
12. fo casellausa com Web www casellacel com Web www casellausa com Contents WIND SPEED amp DIRECTION INDICATORS User Manual WIND SPEED amp DIRECTION INDICATORS Maintenance User Manual CONTENTS PAGE 1 INFRODUGTION drat aira soaks cee Ste aun ot Eid BN el as 3 2 ANEMOMETER WIND SPEED SENSOR 4 2 1 Anemometer Specifications 004 5 3 WINDVANE WIND DIRECTION SENSOR 6 3 1 Windvane Specifications 4 7 3 2 Setting Up for Highest Accuracy 00 8 3 3 RS 232 NMEA Record Output Format 8 4 MECHANICAL INSTALLATION aoaaa 10 4 1 THE SHE 2 i aare 28 deal Noted ea a A iea Sen RE 10 4 2 MACS Mast At ga Since ep Ea Sis sae a th oe AS A A 10 5 SENSOR INTERFACE MODULE 11 5 1 Connection ga sep eee ee a ea aa a ed 11 5 2 Interface Specifications 2 ee 13 6 MAINTENANCE os cae eG Gu ae PR eae ee 15 6 1 Routine Care wide tke eR Ge ee aes 15 6 2 SEIMMICOs i 2 heed abe aae Sea ie Bae Soa ei ae 15 6 3 Order Eistee bet wad Ses 4 ate ck ee Bo kode SY i 16 Page 2 of 16 6 MAINTENANCE 6 1 Routine Care Cleaning may be carried out using a soft damp cloth Solvents or other cleaning products should not be used Apart from cleaning no other regular maintenance is required as the number of moving parts is so few and the bearings on the main spindle are sealed against dust etc If the average wind spe
13. orced conduits The main casing of the Windvane has an M5 x 18 mm stud that can be used for fixing it to the mast top or to the bracket supplied for alternative mounting arrangements All sensors are delivered as standard with a mast Mounting Bracket with pre drilled 5 1 mm mounting holes for the sensors Whatever screwed adapter or flange is employed at the junction between windvane and mast or bracket a locknut must be used for full security The standard model has a single gland and connecting cable with wires colour coded as shown in Figure 4 Page 6 of 16 5 SENSOR INTERFACE MODULE 5 1 Connection The Sensor Interface Module converts standard sensor outputs into formats suitable for long distance transmission 4 20 mA RS 232 RS 485 Separate 0 2 V and 0 1 8 V voltage outputs are also available for the wind speed and wind direction sensors These can be adjusted but it should be noted that doing so will also affect the calibration of the 4 20 mA loop outputs The four multi turn potentiometers on the printed circuit board have the following functions R41 set 4 mA level on 4 20 mA output wind direction R24 set 4 mA level on 4 20 mA output wind speed R32 set 20 mA level on 4 20 mA output OR set DC output voltage span wind direction R2 set 20 mA level on 4 20 mA output OR set DC output voltage span wind speed i L 178035C 178031C g 178032C 178036C 1780
14. pprox 159 C Or TOr 2 Page 8 of 16 Calibrated since power on Example WSD records WSD 125 34 5 0 if never calibrated WSD 348 102 1 if using last calibration stored in E2rom WSD 002 07 8 2 if has been calibrated since powered on Every 250 ms the following NMEA record is output MHWAS ddd w nnnn N where 21 characters output inc space commas and CR LF Start of all NMEA marine standard messages ddd 000 180 Degrees left or right from 0 degree direction w L R Left Right of 0 degree position Note that 180 is always shown as Right nnnn 00 0 99 9 or 100 999 knots wind speed N Units knots Example MHWAS records MHWAS 007 L 35 4 N MHWAS 179 R 115 N The data output sequence is as follows Record Type Time mS WSD Oms MHWAS 0 ms will be same data as WSD 0 ms except the units are changed MHWAS 250 ms WSD 500 ms MHWAS 500 ms will be same data as WSD 500 ms except the units are changed MHWAS 750 ms WSD 1000 ms MHWAS 1000 ms will be same data as WSD 100 ms except the units are changed MHWAS 1250 ms Etc Therefore every 250 ms either a single line or 2 record lines are output These are output at 4800 baud 8 data 1 stop no parity with NO handshaking The NMEA output of this instrument provides signals between 0 V and 5 V This is compatible with most RS 232 computer inputs but is not guaranteed For compatibility with all RS 232 computer inputs us
15. t s power supply 2 Twisted pair wires are preferred to connect the signal outputs of the Interface Module with other equipment Connect one wire of each pair to signal ground and carry the signal via the other wire of the pair 3 Use comms ground as the return signal for RS 232 output or as the common signal for RS 422 RS 485 connection 5 2 Interface Specifications General Supply voltage Power consumption 6 28 V DC 12 mA approx excluding loop currents and sensor loads 4 20 mA Loop Only Speed and Direction Output compliance Maximum permissible load Safety current limit DC Output Voltages Only Output impedance Wind speed output Wind direction output Supply voltage 1 5 V minimum Depends on supply voltage 180 Q at6 V 470 Q at 12 V 1000 Q at 24 V 1200 Q at 28 V 27 MA 470 Q 0 2 VDC for0 75 m s wind speed 0 1 8 V DC for 0 359 wind direction Page 13 of 16 WIND SPEED amp DIRECTION INDICATORS User Manual Sensor Interface WIND SPEED amp DIRECTION INDICATORS User Manual Wind Speed The following tables list connections to the four sockets in the 178050B Sensor Interface Module Table 1 SKT1 Wind Speed Pin Number Application Colour 1 Shield Ground 2 Signal Ground 3 Speed In Yellow 4 Vin 6 28V Red 5 Signal Ground Blue 6 Shield Ground Yellow Green
16. tput Supply voltage Power consumption Stabilisation time Operating temperature Heater option Connecting cable GMR solid state system with microcontroller 75 m s 19 lt 2 lt 0 8 m s for a 10 offset 0 25 Typically 3 0 m 2 2m 0 5 FSD 0 to 359 no deadband at North 0 to 1 8 V DC for 0 to 359 representing a 1 s rolling average updated 5 times per second When anemometer is connected 0 to 5 V level data containing both direction and speed information updated 4 times per second 6 to 28 VDC 3mA lt 1 s from power up 20 to 70 C 24V DC AC 1002 6W 4 5 m without conduit 3 25 m with conduit The design of this sensor does not allow electrical adjustment Where the greatest accuracy is not demanded better than 2 these sensors can be in terchanged However where higher accuracy is required the setting up procedure given in Section 3 2 can be followed Page 7 of 16 Wind Direction WIND SPEED amp DIRECTION INDICATORS WIND SPEED amp DIRECTION INDICATORS Wind Direction User Manual User Manual Conduit 2 55m Qe Uncalibrated T Calibrated Two small recesses in the base plate and an N marker on the instrument case identify the position for north 3 2 Setting Up for Highest Accuracy The design of this sensor does not allow for electrical adjustment Where the greatest accuracy is not demanded better than 2 these sensors can be interchanged However wh

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