Texas Instruments SERIES 525 RAINFALL SENSORS User's Manual
Contents
1. Maximum Switch Rating Temperature Limits Humidity Limits Height Weight Receiving Orifice Diameter Cable Installation Maintenance Warranty 0 01 or 0 1 mm 1 0 at 1 hr or less 1 0 at 10 mm hr or less 135 ms 0 75 ms 30 VDC 2A 115 VAC 1A 32 F to 125 F 0 to 100 10 125 2 5 pounds 6 060 English 9 664 Metric 8 000 USW English 25 feet 2 conductor Consists of attaching the three sensor support legs to a firm platform or securing the side bracket to a stable vertical structure such as the lower end of weather station mast Sensor cable is then connected to monitoring equipment Occasional cleaning of debris from filter screen may be required Three Years ORDERING INFORMATION Model TR 5251 Description Rain Gauge 6 06 collector English Please specify for calibration of 0 2 mm tip TR 525USW Rain Gauge 8 00 collector English TR 525M Rain Gauge 25 mm collector Metric Optional Parts Accessories HOBO MB 525 FC 525 BB 525 HT 525 Cable Event Datalogger and Software Pole Mounting Base Field Calibration Kit Bird Repellant Heater 120 VAC Additional Cable MODEL 525 TIPPING BUCKET RAIN GAUGE TRANSMITTER INSTALLATION INSTRUCTIONS A clear and unobstructed mounting location is necessary to obtain accurate rainfall readings This transmitter has provisions for mounting two ways surface mounting and mast mounting Surf2. Texas Electronics Inc The Gold Standard in Weather Instrumentation Since 1957 SRR COMPLETE WEATHER STATION USER S MANUAL TEXAS ELECTRONICS INC 5529 Redfield St Dallas TX 75235 P O Box 7225 Dallas TX 75209 Phone 214 631 2490 Fax 214 631 4218 Toll Free 800 424 5651 SERIES 525 RAINFALL SENSORS DESCRIPTION The sensor consists of a gold anodized aluminum collector funnel with a knife edge that diverts the water to a tipping bucket mechanism The models TR 525I and TR 525USW are calibrated in inches 01 per tip and model TR 525M is calibrated in millimeters 1mm per tip A magnet is attached to the tipping bucket which as the bucket tips actuates a magnetic switch Thus a momentary switch closure takes place with each tip of the bucket Connecting the sensor to an event counter on an electronic datalogger or display module will allow record keeping of accumulated rainfall If an analog signal representing rainfall accumulation is required Texas Electronics Inc manufactures a suitable conditioning circuit The spent water drains out of the bottom of the housing hence the sensor requires no attention or servicing of any sort It is completely automatic The aluminum sensor housing is finished with a white baked enamel paint to withstand years of exposure to the environment SPECIFICATIONS Resolution Accuracy English Metric Average Switch Closure Time Maximum Bounce Settling Time
3. bracket allows for easy installation and maintenance e Aluminum radiation shield is lightweight and extremely durable White baked enamel finish reflects most radiant heat from sun and surrounding objects INSTALLATION amp MAINTENANCE The radiation shield with sensing element can be pole or mast mounted Whenever possible sensors should be installed at a height of 4 ft 1 2 meters or greater over earth or sod at least 100 ft 30 48 meters away from any concrete or other hard surfaced area and not closer to any other object than four times the height of the object above the instrument shelter or remote sensors Avoid roof installations if possible If it is necessary to roof mount shelters and sensors they should not be closer than 30 ft 9 14 meters to any large vertical reflecting surface walls etc exhaust fans or cooling towers Electronic remote sensors when roof mounted should be at least 9 ft 2 74 meters or greater above the roof surface To minimize radiation effects from the roof they can also be mounted on a horizontal boom so that they will extend from the side of the building roof or tower assembly ORDERING INFORMATION Model Description TTH 1315 Temperature amp Humidity Sensor TTH 1315A Temperature amp Humidity Sensor 4 20 Ma Optional Parts Accessories H50 Interior Humidity Sensing element only Cable Additional Cable MODEL TD 4 WIND DIRECTION SENSOR DESCRIPTION
4. corrected between 80 angle of incidence error within 10 Cosine errors averaged over opposite azimuth error at 60 angle of incidence within 10 Tilt response no error Mechanical Material of housing Anodized aluminum contained in white baked enamel finished aluminum mounting bracket Cable length 60 ft Dimensions Height from surface to top of level Pyranometer 6 25 15 87 cm Width 2 75 6 98 cm Length 8 25 20 95 cm Weight 3 Ibs 1 36 kg with 60 ft cable Environmental Working temperature range 30 to 70 C 22 to 158 F Cable 60 ft 18 28 meters Warranty 3 year FEATURES amp BENEFITS e SP Lite is an all weather instrument e Designed for continuous outdoor use e Complies with Cosine Response e Full 180 degree field of view for complete hemispheric measurement e Contained in lightweight and rugged white baked enamel finished aluminum mounting bracket INSTALLATION amp MAINTENANCE Installation The site for an upward facing pyranometer should be free from any significant obstructions above the plane of the sensing element and should be readily accessible If practicable instrument should be located so that 1 a shadow will not be cast on it at any time e g by radio masts etc 2 it is not close to light colored walls or other objects likely to reflect sunlight onto it and 3 it is not exposed to artificial radiation sources A flat roof provides the best loca
5. or reinstallation charges This warranty is in lieu of all other warranties expressed or implied TEI shall not be liable for any special indirect incidental or consequential damages claimed in connection with any rescission of this agreement by purchaser For a list of specific items covered by the extended warranty see the Three Year Warranty Equipment List Three Year Warranty Equipment List Effective February 1 1992 all of Texas Electronics Inc sensors will carry a Three Year warranty instead of the previous One Year The remainder of terms and conditions of the warranty remains unchanged A specific list of items follows Sensors Covered by Three Year Warranty Parameter Wind Direction Wind Speed Barometric Pressure Relative Humidity Rainfall Temperature Model No TD 105 Synchro TD 104D Potentiometer TD 110 L2 Photo Chopper TD 106 Potentiometer TV 110 L2 Photo Chopper TV 110 L3 Photo Chopper TV 114 A C Generator TB 2012 TH 2013 TH 2013V TR 525 TR 6118 TT 101 Outdoor TT 103R Surface Mount TT 103R W Water Probe TT 309I1 Indoor Solar Radiation TS 100 Systems Covered by Three Year Warranty Model No Description WSC 5 S Wind Speed Controller Single Set Point WSC 5 ST Wind Speed Controller Single Set Point with Time Delay WSC 5 D Wind Speed Controller Dual Set Point WSC 5 DT Wind Speed Controller Dual Set Point with Time Delay WDC 2 Wi
6. the holes Be sure to press both parts all the way in and make sure the flat areas on each arm face the set screws Tighten the set screws Note For optimum performance and maximum bearing longevity you may wish to fine tune the balance of both wind sensors Place the U tube flat on a table such that the sensors hang over the edge Rotate the vane and the cup in 10 degree increments After positioning the vane and cups verify that there is no movement after releasing your hold this must be done in a wind free environment Balance adjustments are made by loosening the set screw to the lighter cup counter weight or fin and shifting it slightly away from the sensor head Step 3 Attach cross bar to U tube Spread end clamps and slide over the U tube Insert cross bar into the ends of both clamps Fasten cross bar in a level position with screws nuts and washers Step 4 Attach U bolts to cross bar and U tube Remove the two nuts and reinforcing plate from both U bolts do not remove the toothed bracket Insert one U bolt through the two holes in the cross bar and the other through the two holes in the bottom of the U arm be careful not to damage the wires inside the U arm Replace the tube reinforcing plate on the U bolt and replace the U bolt nuts Step 5 Slip the U bolts over the mast and tighten Make certain that the anemometer cups do not hit the mast Step 6 Attach guy wire clamp just below the U tube assembly Step 7 A
7. H 520 pulses min Other voltages available upon request 100 MPH 52000 pulses min AC Frequency output 26 mV MPH typical Input Power None self generating 0 133 Hz MPH Analog 4 20 mA out 4 mA 0 MPH Input Power 10 36 VDC 20 mA 100 MPH Performance Accuracy 2 0 mph 0 89 m s Distance Constant gt 21 7 6 6 m Starting Threshold 0 6 mph 0 27 m s Environmental Operational Envelope 0 135 mph 0 to 60 m s Temperature 40 to 160 F 40 to 70 C Relative Humidity 0 100 Physical Cup Wheel Diameter Overall Height Turning Radius Cup Diameter Bearings Mounting Base Weight Cable Warranty 6 0 15 3 cm 4 75 12 1 cm 3 0 7 6 cm 2 0 5 1 cm APEC 3 or better Screw attachment 10 32 machine screw 0 5 Ibs 0 23 kg less cable 60 18 3 m 3 conductor 22 gauge 3 year FEATURES amp BENEFITS Superior low starting threshold due to small physical size No plastic parts for extremely long life Precision stainless steel bearings for stability and repeatability Crossarm included with purchase of matching wind direction sensor Easy installation and maintenance Over 5 years in production Lightweight and rugged anodized aluminum exterior INSTALLATION amp MAINTENANCE Installation consists of threading the 10 32 mounting base into our crossarm or any other suitable beam If a crossarm is used the entire unit can be bolted to a mast or attached via U bolts The sensor is d
8. The Texas Electronics Inc TD 4 Wind Direction Sensor is a mechanical style wind meter that measures the horizontal wind azimuth This unit combines small physical size with superior bearings to meet the EPA s Prevention of Significant Deterioration PSD starting threshold requirements The TD 4 wind direction sensor is a freestanding device for measuring the direction of wind The sensor consists of a vane and counterweight assembly which is mechanically coupled to a potentiometer variable resistor As the vane rotates in the wind the potentiometer changes resistance proportionally to the direction of wind SPECIFICATIONS Operating Range Signal Presentation 5000 ohm output 10000 ohm output Analog 4 20 mA output Performance Accuracy Starting Threshold Resolution Potentiometer Linearity Environmental Operational Envelope Temperature Relative Humidity Physical Vane Overall Length Overall Height Turning Radius Weight Bearings Mounting Base Cable Warranty 0 360 mechanical 5000 ohm potentiometer 10000 ohm potentiometer or Analog 4 20 mA 0 355 electrical range 3 VDC excitation minimum 0 357 electrical range 3 VDC excitation minimum 0 355 electrical range 10 30 VDC 3 0 0 6 mph 0 27 m s 1 1 0 0 135 mph 0 to 60 m s 40 to 160 F 40 to 70 C 0 100 8 5 21 6 cm 6 75 17 2 cm 13 33 cm 0 5 Ibs 0 23 kg less cable APEC 3 or bett
9. ably four times the height of the object above the top of the gauge All types of gauges must be exposed with the rim of the receiver in a horizontal plane and at a level well above the average level of snow surfaces Roof mounting of rain gauges should be avoided when possible Air currents at heights other than at ground level have been observed to cause an apparent decrease in rainfall catch commensurate with the increase in mounting height above ground level Objects which individually or in small groups constitute a windbreak reduce prevailing wind speed in the vicinity of the gauge This reduction of wind speed will as a consequence also reduce possible eddy currents and turbulence around the gauge The presence of such objects is usually beneficial in providing a more accurate rainfall catch Ideally the windbreak objects fences bushes etc should be generally uniform in height and distance from the gauge Height above the gauge should not exceed about twice their distance from the gauge ANEROID BAROMETERS SELF CONTAINED MECHANICAL INSTRUMENTS AND ELECTRONIC REMOTE BAROMETRIC PRESSURE SENSORS Select a site where the instrument will not be subject to rapid fluctuations of temperature or to jarring and continuous vibration Avoid exposing the instrument to direct sunlight or radiant heaters and to direct drafts such as open windows and doors Reference 1 U S Department of Commerce National Weather Service Bulletin LS 5927 Re
10. ace mounting is recommended where possible The transmitter housing MUST be mounted in a LEVEL position and in a location free from vibration If mast mounted make sure that the mast is properly guyed so that vibration in high winds is kept to a minimum THE FOLLOWING IS VERY IMPORTANT After the final transmitter installation has been made remove the top gold funnel portion of the transmitter and observe the black tipping bucket It should NOT repeat NOT be held in a dead center position by the magnetic attraction of the bucket magnet and the hermetically sealed magnetic switch Press either end of the bucket down against the stop to be sure that it is not centered The transmitter to indicator connecting cable may be either shortened or lengthened as required The funnel and tipping bucket mechanism should be cleaned periodically An accumulation of dirt bugs etc on the tipping bucket will adversely affect the calibration FIELD CALIBRATION TR 525USW Absolutely accurate calibration can be obtained only with laboratory equipment but an approximate field check can be easily made The tipping bucket mechanism is a simple and highly reliable device The transmitter must be located in a clear area away from trees buildings etc It must also be mounted level Accurate readings will not be obtained unless the transmitter is mounted in a level position The mechanism must be clean Any accumulation of foreign material dust etc will alter
11. agnetic compass instrument Wind direction data at Federal Aviation Agency and other aircraft reporting facilities for direct control tower to pilot utilization is always made in reference to this magnetic north format REMOTE TEMPERA TURE HUMIDITY SENSORS AND INSTRUMENT SHELTERS Whenever possible instrument shelters as well as remote temperature and or humidity sensors should be installed at a height of 4 feet or greater over earth or sod at least 100 feet from any concrete or other hard surfaced area and not closer to any other object than four times the height of the object above the instrument shelter or remote sensors Avoid roof installations if possible If it is necessary to roof mount shelters and sensors they should not be closer than 30 feet to any large vertical reflecting surface walls etc exhaust fans or cooling towers Electronic remote sensors when roof mounted should be at least 9 feet or greater above the roof surface To minimize radiation effects from the roof they can also be mounted on a horizontal boom so that they will extend from the side of a building roof or existing tower Horizontal booms should extend approximately 5 to 10 feet from the side of the building roof or tower assembly Standard U S Weather Bureau cotton region shelter Spec No 450 0615 Rev 8 67 PRECIPITATION GAUGES Rain gauges should be installed on a level plot of ground at a distance from any object of at least two and prefer
12. anometer is used for measuring the solar radiation emitting on the horizontal surface The sensor consists of a photodiode housing mounting bracket with cable junction box attached and cable A resistance shunts the photodiode This is done to generate a voltage output The photodiode and the material on top of it determine most electrical specifications It is encapsulated in the housing in such a way that it has a field of view of 180 degrees and that its angular characteristics fulfill the Cosine Response The nominal output resistance of the pyranometer is 50 Watts This implies that the input impedance of the readout equipment should be at least 5000 Ohms in order to make an error of less than 0 1 Cable can be extended without problems to a length of 328 ft or 100 meters provided that cable resistance is less than 0 1 of the input impedance of the readout equipment The electrical sensitivity of the photodiode changes with the temperature A nominal value for this is 0 2 change per degree Celsius Calibration is done at 20 C 68 F SPECIFICATIONS Electrical Impedance nominal 50 Ohms Response time lt 1 sec Sensitivity nominal 100 uV W m2 Expected signal range under atmospheric conditions 0 to 0 2V Stability lt 2 per year Non linearity lt 1 up to 1000 W m2 Temperature dependence of sensitivity 0 15 C Spectral Spectral range 0 4 to 1 1 nm Detector type SILICON photo diode Directional Cosine
13. asts should not be of such bulk or shape as to create an appreciable obstruction to wind flow Avoid sites where local obstructions may create up or down drafts eddy currents or jet flow effects When sensors are roof mounted they should be installed at least 10 feet or greater from the roof surface depending upon the particular installation site Turbulence and other local effects can be reduced somewhat by mounting sensors on the upwind and of the building that end of the building exposed to the most common local prevailing winds Horizontal mount booms which extend from existing towers should be fabricated so that sensors will extend a distance of 5 to 10 feet from the tower assembly dependent on tower thickness Wind direction sensors are oriented upon installation in reference to either true north or magnetic north True north is obtained by applying a local magnetic variation correction factor to a magnetic north compass indication magnetic variation for a particular locality is obtainable from the nearest Weather Bureau Branch Office Indicator readings for a true north sensor orientation will then be in terms of true geographic compass points All U S Weather Bureau surface wind data used for observational network reporting purposes and general public use is given in reference to this true north format Indicator readings for a magnetic north sensor orientation will be in terms of actual readings as would be obtained from directly viewing a m
14. er Screw attachment 10 32 machine screw 60 18 3 m 3 conductor 22 gauge 3 year FEATURES amp BENEFITS Superior low starting threshold Long life hybrid dual wiper potentiometer No plastic parts for extremely long life Precision stainless steel bearings for stability and repeatability Crossarm included with purchase of matching wind speed sensor Easy installation and maintenance Over 25 years in production Lightweight and rugged anodized aluminum exterior INSTALLATION amp MAINTENANCE Installation consists of threading the 10 32 mounting base into our crossarm or any other suitable beam If a crossarm is used the entire unit can be bolted to a mast or attached via U bolts The sensor is dynamically calibrated at the factory and due to the nature of its operation should not require field calibration Calibration is a matter of proper orientation during installation A magnetic compass is recommended for proper orientation Field maintenance should include occasional cleaning of the vane assembly and inspection of the internal mechanism to make sure it is free from insects and debris In some applications users may need to occasionally verify and document sensor accuracy with a calibration dial vane Possible bearing and potentiometer replacement every three to five years to maintain low starting threshold ORDERING INFORMATION Model Description TD 4 Wind Direction Sensor Light Industrial TD 410 Wind Direction Sensor Li
15. et rather than flowing Under this condition the bucket tips between drips and no error water is added to a full moving bucket TO CHECK CALIBRATION A field calibration kit is available from Texas Electronics Inc Model No FC 525 is a kit that consists of a holding tank pre measured beaker two orifices cleaning tools and instructions MODEL TTH 1315 TEMPERATURE HUMIDITY SENSOR DESCRIPTION The Texas Electronics Inc Model TTH 1315 Sensor utilized a Rotronics HygroClip S3 Humidity Temperature Probe with interchangeable sensing elements that do not require calibration The unit is encased in a corrosive resistant spun aluminum radiation shield that allows for wind aspiration and protection from the sun s UV rays The shield is finished in white baked enamel to provide for virtual cosmetic invisibility while reflecting much of the radiant heat from surrounding objects and the sun Overcurrent protection is provided in a NEMA 4X enclosure that is mounted to the angled mounting bracket on the sensor Tranzorbs are utilized to protect the sensor and signal conditioning units in an overcurrent situation With DC voltage applied to the sensor the unit will return signal voltages that are linear to the range of the instrument Signal conditioning is applied to ensure proper voltages are returned and can be amplified or modified to a current output to connect to any analog signal processing un
16. ght 10K TD 4A Wind Direction Sensor Light 4 20 mA Sensor is designed to work with TV 4 series wind speed sensors Optional Parts Accessories Cable Additional Cable MODEL TV 4 WIND SPEED SENSOR DESCRIPTION The Texas Electronics Inc TV 4 Wind Speed Sensor is a mechanical style anemometer that measures the horizontal velocity of wind This unit combines small physical size with superior bearings to meet the EPA s Prevention of Significant Deterioration PSD starting threshold requirements The TV 4 wind speed sensor is a freestanding device for measuring air velocity The sensor consists of a lightweight 3 cup anemometer which electromechanically converts wind speed into a measurable electronic signal The output signal can be presented in 3 optional forms a pulsed DC signal an AC frequency or a conditioned analog signal Each output has a specific application The pulsed DC signal is used where high accuracy is needed and continuous power is not a problem The AC frequency output is used in situations where power consumption is critical And finally the conditioned analog signal is used to easily and quickly communicate with virtually all digital control systems such as PLC s or SCADA systems SPECIFICATIONS Operating Range 0 100 mph Signal Presentation Pulsed DC output light chopper AC Frequency or Analog 4 20 mA Please specify Pulsed DC output 20 slot disc Input Power 5 0 VDC 5mA typical 1 MP
17. h then retighten the set screw The second method involves rotating the entire mast assembly until proper orientation is achieved this technique is usually easier because of the heights involved but will usually necessitate repositioning rotating of the guy wire clamp If winds are creating rapid fluctuations in the vane making calibration difficult the vane can be temporarily secured in a fixed position by carefully wedging a thickly folded piece of paper or cardboard into the gap between the upper and lower halves of the direction sensor An alternative technique is to lap a string over the vane and carefully hold it in position be careful not to bend the vane when using this approach Warranty Texas Electronics Inc hereafter TEI warrants the equipment manufactured by it to be free from defects in material and workmanship Upon return transportation charges prepaid to TEI within three 3 years of original shipment of sensors and one 1 year of original shipment of electronics recorders and indicators TEI will repair or replace at its option any equipment which it determines to contain defective material or workmanship and will return said equipment to purchaser F O B TEI Texas Electronics shall not be obligated however to repair or replace equipment which has been repaired by others abused improperly installed altered or otherwise misused or damaged in any way TEI will not be responsible for any dismantling re assembly
18. ing bucket mechanism is a simple and highly reliable device The transmitter must be located in a clear area away from trees buildings etc It must also be mounted level Accurate readings will not be obtained unless the transmitter is mounted in a level position The mechanism must be clean Any accumulation of foreign material dust etc will alter the calibration of this unit The transmitter must be calibrated with the rate of flow of water through the tipping bucket mechanism under control At least 36 seconds should be allowed to fill one side of the tipping bucket This represents a maximum flow rate of on inch of rain per hour If the flow rate is increased then the instrument will read low if properly calibrated Decreasing the rate of flow will not materially affect the calibration The reason for this is obvious if the tipping bucket assembly is observed in operation with water falling into one side of the tipping bucket there comes a point when the weight of this water starts to tip the bucket Some time is required for the bucket to tip a few milliseconds During the first 50 of this tipping time water continues to flow into the filled bucket the last 50 of this tipping time water flows into the empty bucket The amount of water flowing during the first 50 of the time is error the faster the flow rate the greater the error Now at flow rates of one inch per hour 100 bucket fillings or less the water actually drips into the buck
19. it SPECIFICATIONS Humidity Sensor ROTRONIC HygromerO C94 capacitive Temperature Sensor RTD Pt100 Ohm 1 3 DIN Sensor Protection Wire Mesh filter standard foam filter optional Measuring Range 0 100 Relative Humidity 40 to 140 F 40 to 60 C Temperature Operating Limits Same as measuring range Accuracy at 1 5 RH and 0 5 F 73 F 23 C 0 3 C standard calibration 1 0 RH and 04 F 0 2 C special calibration optional Repeatability Better than 0 5 RH and 0 1 C 32 18 F Analog output signals 0 100 RH 0 1V minimum load gt 10k ohm 40 140 F 0 1V 40 60 C Analog Signal Resolution 0 02 RH and 0 1 F Sampling Time Maximum cable length Connection Type Protection grade lt 0 7 sec 5 m 15 ft for direct output Up to 100 m 325 ft with signal amplifier Bayonet cap on mounting connector IP65 probe to connector Supply voltage 3 5 5S0VDC Current consumption lt 4mA Minimum excitation time lt 4 sec EMC compatibility CE EN 5008 1 2 EN 50082 2 Material Polycarbonate white Dimensions Length 100 mm 3 94 Diameter 15 mm 0 59 Weight 14 0 5 oz FEATURES amp BENEFITS e Combines Temperature and Humidity onto one sensing unit e Rotronics HygroClip S3 has interchangeable sensing elements requiring no calibration e Stacked plate construction of shelter provides natural ventilation e Quick Release mounting
20. ment will not be subject to rapid fluctuations of temperature or to jarring and continuous vibration Avoid exposing the instrument to direct sunlight or radiant heaters and to direct drafts such as open windows and doors A mounting bracket with hardware is attached to the Nema enclosure of the sensor ORDERING INFORMATION Model Description TB 2012M Barometric Pressure Sensor TB 2012MA Barometric Pressure Sensor 4 20 mA Optional Parts Accessories Cable Additional Cable High Elevation Applications of higher than 1800 ft or 548 64 meters above sea level require factory modification PROPER EXPOSURE OF METEOROLOGICAL INSTRUMENTS Generally recognized guidelines follow which depict ideal sensor mounting locations These guidelines or rules of thumb are only suggestive in nature in an attempt to aid the user to selecting optimum representative sampling locations for a particular sensor Reference was made to US Weather Bureau Installation criteria in preparing this data See Reference 1 WIND EQUIPMENT So far as available sites permit wind sensors should be placed above the ground on a freely exposed tower 20 feet or higher and over terrain that is relatively level and free from obstructions to wind flow When a compromise must be made sensing units should be exposed at least 12 feet above any obstruction within 100 feet and at least as high as any obstruction within 100 to 200 feet of the wind equipment Support towers or m
21. nd Direction Controller
22. rometric Pressure Sensor uses an active solid state device to sense barometric pressure Self contained electronics provide a regulated voltage to the solid state sensor and amplification for the signal output The unit s range of 26 to 32 or 878 mb to 1080 mb of mercury allows it to be used at elevations up to 1800 feet or 548 64 meters above sea level The unit is temperature compensated from 18 to 50 C if elevations above 1800 feet or 548 64 meters are required contact the factory for higher elevation calibration SPECIFICATIONS Calibration Range Supply Voltage Current Draw Accuracy Operating Temperature Range Calibrated Temperature Range Output Optional Output Weight Dimensions Warranty 26 to 32 or 878 mb to 1080 mb 12 to 15 VDC lt 15 mA 1 3mb 40 to 50 C 18 to 50 C 0 1 VDC 4 20 mA 2 lb or 8 9 N or 907 kg w 60 ft or 18 3 meters cable 6 or 15 24 cm H x 5 or 12 7 cm W x 3 or 7 62 cm D Single enclosure double enclosure also available 3 year FEATURES amp BENEFITS Interfaces to virtually all data acquisition systems Can be used up to 1800 ft elevation without factory modification Over 1800 ft elevation applications available Easy installation and maintenance Over 5 years in production Weatherproof Nema Enclosure for superior outdoor protection Wide range of 26 to 32 Hg or 878 to 1080 mb INSTALLATION amp MAINTENANCE Select a site where the instru
23. the calibration of this unit The transmitter must be calibrated with the rate of flow of water through the tipping bucket mechanism under control At least 36 seconds should be allowed to fill one side of the tipping bucket This represents a maximum flow rate of on inch of rain per hour If the flow rate is increased then the instrument will read low if properly calibrated Decreasing the rate of flow will not materially affect the calibration The reason for this is obvious if the tipping bucket assembly is observed when the weight if this water starts to tip the bucket Some time is required for the bucket to tip a few milliseconds During the first 50 of this time water flows into the empty bucket The amount of water flowing during the first 50 of the time is error the faster the flow rate the greater the error Now at flow rates of one inch per hour 100 bucket fillings or less the water actually drips into the bucket rather than flowing Under this condition the bucket tips between drips and no error water is added to a full moving bucket TO CHECK CALIBRATION A field calibration kit is available from Texas Electronics Inc Model No FC 525 is a kit that consists of a holding tank pre measured beaker two orifices cleaning tools and instructions FIELD CALIBRATION TR 5251 amp TR 525M Absolutely accurate calibration can be obtained only with laboratory equipment but an approximate field check can be easily made The tipp
24. tion or a rigid stand with a horizontal upper surface some distance from building structures or other obstructions The stand should be sufficiently rigid that the horizontal position of the receiving surface does not change especially during high winds Precautions should be taken to avoid subjecting the instrument to severe shocks or vibration Calibration Cleaning Frequency Recalibration is suggested every two years preferably by letting a higher standard run parallel during two sunny days and comparing daily totals The sensor should be kept clean using water or alcohol ORDERING INFORMATION Model Description SP Lite Solar Radiation Sensor SP Lite A Solar Radiation Sensor 4 20 mA Optional Parts Accessories Cable Additional Cable available upon request Model TB 2012M Barometer Remove cover of TB 2012M and adjust for local pressure Refer to Pressure vs Voltage Current Table under the Barometer section of the service manual aaaans DIS Q 9 z ATI KTS AA a R u 3 ELECTRIC BAROMETER S MODEL NO TB 2012M 03 R15 S N 102795 MODEL TB 2012M BAROMETRIC PRESSURE SENSOR DESCRIPTION Shown with cover removed The Texas Electronics Inc TB 2012M Ba
25. ttach base mount to the roof or side wall Note that the base mount U bolt will rotate to fit any angle Step 8 Install guy wire anchors not included or locate secure points for guy wire attachment Step 9 Erect mast and install guy wires not included and turn buckles not included Step 10 Ground the mast to help protect the sensors and structure from lightning hits Supplies needed mast wire clamp grounding wire wire supports and grounding rod Step 11 Run the sensor wire inside to the console Lead in wire is permanently attached to the sensor unit Attach to console according to wire color code If necessary the cable may be cut down in length or wire may be added with negligible effect on the calibration If changing cable lengths more than a few hundred feet you may wish contact the factory to determine the severity of the effect on calibration Additional cable lengths are available from Texas Electronics if needed Step 12 Calibrate the Wind Vane Be sure console is operating properly first This is normally a two man job with one individual watching the direction indicated by the weather station and the other adjusting the sensor while watching a compass Two methods of aligning the vane are available The first method involves loosening the large set screw at the bottom of the wind direction sensor so that it will rotate on the U arm Turn the bottom half of the sensor until the compass readings and the indication matc
26. vised 0 4 12 January 1963 SOLAR RADIATION SENSORS The Solar Radiation Sensor is normally mounted on a level surface totally remote from trees poles or power lines that might cast a shadow on the sensor at any time of the day However there may be occasions because of extreme latitudes when it is desired to mount the sensor at some angle other than level The sensors may also be mounted on a sun tracking mechanism or behind a shadow band if diffuse sky radiation is to be measured WIND DIRECTION amp SPEED SENSORS INSTALLATION These instructions apply to roof top installation We advise that you first read over these instructions before beginning assembly as several referenced items are not supplied with your weather equipment this is because most every installation is unique thus these parts are best obtained by the installer Reference to the U Tube Cross Bar Installation figure and Sensor Installation figure may be helpful Step 1 Attach the three anemometer cups to the speed sensor head Loosen the three set screws on the top of the anemometer lower unit Insert the anemometer cup arms into the holes Be sure to press the arms all the way in and make sure that the flat areas on the arms face toward the set screws Tighten the set screws Step 2 Attach wind vane and counter weight to the direction sensor head Loosen the two set screws on the top of the wind vane upper unit Insert the vane and counter weight into
27. ynamically calibrated at the factory and due to the nature of its operation should not require field calibration Field maintenance should include occasional cleaning of the cup assembly and inspection of the internal mechanism to make sure it is free from insects and debris In some applications users may need to occasionally verify and document sensor accuracy with a synchronous test motor Other possible routine maintenance is to replace the bearing housing assembly every three to five years to maintain low starting threshold ORDERING INFORMATION Model Description TV 4 Wind Speed Sensor Light Industrial Specify supply voltages other than 5 VDC TV 4AC Wind Speed Sensor AC Generator TV 4A Wind Speed Sensor Analog 4 20 mA Sensor is designed to work with TD 4 wind direction sensor Optional Parts Accessories Cable Additional Cable MODEL SP LITE SOLAR RADIATION SENSOR DESCRIPTION The Texas Electronics Inc SP Lite Solar Radiation Sensor utilizes a Kipp amp Zonen Silicon pyranometer mounted in a white baked enamel finished aluminum bracket that provides a stable upward facing installation It measures the solar energy that is received from the entire hemisphere 180 degrees field of view The output is expressed in Watts per square meter The pyranometer is designed for continuous outdoor use Its calibration is valid for natural sunlight only but not for artificial light In its most frequent application the pyr
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