Texas Instruments TR-525USW, SERIES 525 RAINFALL SENSORS, TR-525I User Manual

284.79 Kb



Cup Wheel Diameter:

6.0" (15.3 cm)

Overall Height:

4.75" (12.1 cm)

Turning Radius:

3.0" (7.6 cm)

Cup Diameter:

2.0" (5.1 cm)


APEC 3 or better

Mounting Base:

Screw attachment, 10-32machine screw


0.5 lbs (0.23 kg) less cable


60' (18.3 m) 3 conductor 22 gauge


3 year


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 consists of threading the 10-32mounting 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 viaU-bolts.

The sensor is dynamically 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.


Model #



Wind Speed Sensor, Light Industrial


(Specify supply voltages other than 5 VDC)


Wind Speed Sensor, AC Generator


Wind Speed Sensor, Analog 4-20mA

*Sensor is designed to work with TD-4wind direction sensor.

Optional Parts / Accessories


Additional Cable



The Texas Electronics, Inc. SP-LiteSolar Radiation Sensor utilizes a Kipp & Zonen Silicon pyranometer mounted in a whitebaked-enamelfinished aluminum bracket that provides a stableupward-facinginstallation. 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 pyranometer 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).



Impedance (nominal): 50 Ohms


Response time: < 1 sec.


Sensitivity (nominal): 100 uV/W/m2


Expected signal range under atmospheric conditions: 0 to 0.2V


Stability: <+/- 2% per year


Non-linearity:< 1% up to 1000 W/m2


Temperature dependence of sensitivity: +/- 0.15%/°C


Spectral range: 0.4 to 1.1 nm


Detector type: SILICON photo diode


Cosine 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





Material of housing: Anodized aluminum contained in white bakedenamel 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 lbs. (1.36 kg.) with 60 ft. cable

Working temperature range - -30°to +70°C(-22°to +158°F)

60 ft. (18.28 meters)

3 year


SP-Liteis anall-weatherinstrument

Designed for continuous outdoor use

Complies with "Cosine Response"

Full 180-degreefield of view for complete hemispheric measurement

Contained in lightweight and rugged white baked-enamelfinished aluminum mounting bracket



The site for an upward-facingpyranometer 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 tolight-coloredwalls 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 location, 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.


Model #



Solar Radiation Sensor


Solar Radiation Sensor, 4-20mA

Optional Parts / Accessories


Additional Cable available upon request

Texas Electronics, Inc.

5529 Redfield St.

Dallas, Tx 75235

Model TB-2012MBarometer

Remove cover of TB-2012Mand adjustforlocal pressure.

Refer to Pressure vs Voltage/Current Table under the Barometer section of the service manual.





















































































































































































































S/N 102795

















(Shown with cover removed)


The Texas Electronics, Inc. TB-2012MBarometric Pressure Sensor uses an activesolid-statedevice to sense barometric pressure.Self-containedelectronics provide a regulated voltage to thesolid-statesensor 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.


Calibration Range:

26" to 32" or 878 mb to 1080 mb

Supply Voltage:

12 to 15 VDC

Current Draw:

<15 mA


+/- 1.3mb

Operating Temperature Range:

-40°to +50°C

Calibrated Temperature Range:

-18°to +50°C



Optional Output:



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


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


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.


Model #



Barometric Pressure Sensor


Barometric Pressure Sensor, 4-20mA

Optional Parts / Accessories


Additional Cable

High Elevation:

Applications of higher than 1800 ft. or 548.64 meters above sea-levelrequire factory




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).


So far as available sites permit, wind sensors should be placed above the ground on a freely-exposedtower (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 createup-or-downdrafts, eddy currents orjet-floweffects. When sensors areroof-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-mountbooms 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-pilotutilization) is always made in reference to this magnetic north format.


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 hardsurfaced 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 toroof-mountshelters 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 whenroof-mountedshould 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 Bureaucotton-regionshelter (Spec. No. 450.0615, Rev. 8/67)


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. Roof-mountingof 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.


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.


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.



These instructions apply to roof-topinstallation. 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-TubeCross-BarInstallation" 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-weightinto the holes. Be sure to press both parts all the way in and make sure the flat areas on each arm face theset-screws.

Tighten the set screws.

Note: For optimum performance and maximum bearing longevity you may wish to fine-tunethe balance of both wind sensors. Place theU-tubeflat 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 awind-freeenvironment). Balance adjustments are made by loosening the set screw to the lighter cup,counter-weightor 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-barinto the ends of both clamps.

Fasten cross-barin 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 oneU-boltthrough the two holes in thecross-barand the other through the two holes in the bottom of theU-arm(be careful not to damage the wires inside theU-arm).

Replace the tube reinforcing plate on the U-boltand replace theU-boltnuts.

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: Attach base mount to the roof or side wall.

Note that the base mount U-boltwill 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 match 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 theguy-wireclamp.

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).


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.

For a list of specific items covered by the extended warranty, see the Three-Year Warranty Equipment List.