tb-2012m barometric pressure sensor user`s manual
Contents
1. Texas Electronics Inc The Gold Standard in Weather Instrumentation Since 1957 K EFEFEEEEEFEFEEFEEFESESEESZEZEZSEEEEF TB 2012M BAROMETRIC PRESSURE SENSOR 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 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 8869888 DIS Q 9 E ATI KTS AA M 8 n 5 Z ELECTRIC BAROMETER d MODEL NO TB 2012M bod R15 S N 102795 MODEL TB 2012M BAROMETRIC PRESSURE SENSOR DESCRIPTION Shown with cover removed The Texas Electronics Inc TB 2012M Barometric 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 5482. 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 15 mA 1 3mb 40 to 50 C 18 to 50 C 0 1 VDC 4 20 mA 2 Ib 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 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 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
3. should be the proper output IN THE ELECTRONICS PACKAGE Set null pot R15 until that voltage output is obtained SUCH AS THE BPC 250 OR BPC 500 THE OUTPUT FROM THE TB 2012M IS FED DIRECTLY INTO THE PA 20 00 V 03 1 AND AMPLIFIED TO THE 2 ome 166V USERS NEEDS 28 333V BE SURE TO TAKE THIS INTO 20 500V CONSIDERATION WHEN SETTING 30 666V UP THE SYSTEM AT IT S 3 ve 833V PERMANENT ELEVATION SP EE 1 000V Replace cover and secure evenly System should not need further calibration or setup o SENSOR p RSS OUT COM REF SIG COM 12V COM Board Shown Is Standard Output O 1 Volt 166Mv In N 100k RB lt d 49 9k E SES aa c1 1 R1 ANANN 4 5 62K R11 R2 _ VVV 32 4K SAC Fa R4 ne NN ANN Js T A sew l lg j U2 R3 c98 ees EN l ANN E MH 475K FA A c7 d c99 C4 c cy 4 2 Me 3H s x A 2 NN o 100 gig VV R16 ANNIS 26 1K 4 AP om 6 9 4 10K R19 FOE A NAP R14 vi 8 AAAP 26 1K 10K HIV R18 R20 1 20K M Altitude feet RPOT z 2500 9500 44 2k itm D3 RPOT 22 9500 13500 61 9k SPAN 4 TOMAS 18500 1550p75 0k RPOT 15 M329 ied REF 17500 2050 110K R15 50K V VV f 20k Maximum Altitude is 20500
4. 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 masts 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 t
5. Fee NULL 4 ii co Standard Output Is 0 1 Volt 166Mv In NAN Altitude 0 2500 Feet 100 Vo Es is Range 26 to 32 Hg D2 Dt 2 Us Js For Altitude above 2500 feet ES 3 7662 INADA See Chart Above c2 i L Bs Spe M 4 15 For 0 2 5 VoltOutput R14 50K R15 5K R16 95 5K R17 50K Por Por For 0 3 VoltOutput R14 50K R15 20K R16 120K R17 10K oT POT P For 0 5 VoltOutput R14 64 9K R15 20K R16 191K R17 50K POT Por 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 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 F
6. and if diffuse sky radiation is to be measured TB 2012M ALTITUDE SETTING INSTRUCTIONS To set barometer to your elevation follow the instructions listed below Output 0 1V Range 26 to 32 1666V Inch 001666V 01 Inch Obtain local barometric pressure from NOAA NWS airport radio TV station or from any facility that would have the most accurate information closest to your installation If you are using the Texas Electronics Inc digital or analog indicators remove the four cover screws from the TB 2012M and adjust the null pot R15 until your indicators agree with the reference obtained You may want to do this more than once especially if the weather is unsettled at the time If you are connected to a Solus amp Data logger you can set to your elevation by inserting either a plus or minus voltage in the calibrate Offset xxxx box With Solus running follow these steps from menu bar click on setup sensor edit select TB 2012M then insert value desired then save 10 increases reading by 10 10 decreases reading by 10 By using the chart below and the following conversion it is very easy to set up Example If the pressure reading that you obtained is 29 13 NOTICE From the chart below IF THE FINAL OUTPUT FROM THE OVERALL SYSTEM IS OTHER Choose 29 which is 500 V THAN 0 1 VOLT THERE WILL BE Then multiply 13 x 00166 V 0216 V A PA 03 1 AMPLIFIER INSTALLED 5 V 0216 V 52160 V
7. 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 PRECIPITATION GAUGES Rain gauges should be installed on a level plot of ground at a distance from any object of at least two and preferably 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 Standard U S Weather Bureau cotton region shelter Spec No 450 0615 Rev 8 67 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
8. 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 Revised 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 b
9. he 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 magnetic 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 TEMPERATURE 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
10. or 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 309I 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 Wind Direction Controller
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