Texas Instruments SERIES 525 RAINFALL SENSORS User Manual

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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-edgethat diverts the water to a tipping bucket mechanism. The modelsTR-525IandTR-525USWare calibrated in inches (.01” per tip) and modelTR-525Mis 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:

0.01” or 0.1 mm

Accuracy:

 

English

1.0% at 1”/hr or less

Metric

1.0% at 10 mm/hr or less

Average Switch Closure Time:

135 ms

Maximum Bounce Settling Time:

0.75 ms

Maximum Switch Rating:

30 VDC @ 2 A, 115 VAC @ 1 A

Temperature Limits:

+32°F to +125°F

Humidity Limits:

0 to 100%

Height:

10.125”

Weight:

2.5 pounds

Receiving Orifice Diameter:

6.060” (English)

 

9.664” (Metric)

 

8.000” USW (English)

Cable:

25 feet, 2-conductor

Installation:

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.

Maintenance:

Occasional cleaning of debris from filter screen may be required.

Warranty:

Three Years

ORDERING INFORMATION

Model #

Description

TR-525IRain Gauge, 6.06” collector, English

(Please specify for calibration of 0.2 mm/tip) TR-525USWRain Gauge, 8.00” collector, EnglishTR-525MRain Gauge, 25 mm collector, Metric

Optional Parts / Accessories

HOBO

Event Datalogger and Software

MB-525

Pole Mounting Base

FC-525

Field Calibration Kit

BB-525

Bird Repellant

HT-525

Heater, 120 VAC

Cable

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. Surface mounting is recommended where possible. The transmitter housing MUST be mounted in aLEVEL 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 (repeatNOT) 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. Itmust also be mountedlevel. 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 therate 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 iserror, the faster the flow rate, the greater theerror. 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 noerror water is added to a full moving bucket.

TO CHECK CALIBRATION:

A field calibration kit is available from Texas Electronics, Inc. Model No. FC-525is a kit that consists of a holding tank,pre-measuredbeaker, two orifices, cleaning tools and instructions.

FIELD CALIBRATION

TR-525I&TR-525M

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. Itmust also be mountedlevel. 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 therate 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 iserror, the faster the flow rate the greater theerror. 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 noerror water is added to a full moving bucket.

TO CHECK CALIBRATION:

A field calibration kit is available from Texas Electronics, Inc. Model No. FC-525is a kit that consists of a holding tank,pre-measuredbeaker, two orifices, cleaning tools and instructions.

MODEL TTH-1315TEMPERATURE HUMIDITY SENSOR

DESCRIPTION

The Texas Electronics, Inc. Model TTH-1315Sensor utilized a Rotronics HygroClip S3 Humidity Temperature Probe with interchangeable sensing elements that do not require calibration.

The unit is encased in a corrosive-resistantspun aluminum radiation shield that allows for wind aspiration and protection from the sun's UV rays. The shield is finished in whitebaked-enamelto 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 unit.

SPECIFICATIONS

Humidity Sensor:

ROTRONIC HygromerÒ 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 >10k ohm)-

 

40…+140°F = 0…1V (-

 

40…+60°C)

 

Analog Signal Resolution 0.02%

 

RH and 0.1°F

Sampling Time:

<0.7 sec

Maximum cable length:

5 m / 15 ft. for direct output

 

Up to 100 m / 325 ft. with signal

 

amplifier

Connection Type:

Bayonet cap on mounting

connector

 

Protection grade:

IP65 (probe to connector)

Supply voltage:

3.5 … 50VDC

Current consumption:

<4 mA

Minimum excitation time:

<4 sec

EMC compatibility (CE):

EN-50081-2,EN-50082-2

Material:

Polycarbonate, white

Dimensions:

Length: 100 mm (3.94")

 

Diameter: 15 mm (0.59")

Weight:

14 g / 0.5 oz.

FEATURES & BENEFITS

Combines Temperature and Humidity onto one sensing unit

Rotronics HygroClip S3 has interchangeable sensing elements requiring no calibration

Stacked plate construction of shelter provides natural ventilation

Quick-Releasemounting bracket allows for easy installation and maintenance

Aluminum radiation shield is lightweight and extremely durable

White baked-enamelfinish reflects most radiant heat from sun and surrounding objects

INSTALLATION & 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-surfacedarea 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 ft. (9.14 meters) to any large, vertical reflecting surface (walls, etc.), exhaust fans, or cooling towers. Electronic remote sensors whenroof-mountedshould 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-1315Temperature & Humidity Sensor

TTH-1315ATemperature & Humidity Sensor,4-20Ma

Optional Parts / Accessories

H50

Interior Humidity Sensing element only

Cable

Additional Cable

MODEL TD-4WIND DIRECTION SENSOR

DESCRIPTION

The Texas Electronics, Inc. TD-4Wind 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-4wind 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 4-20mA 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 4-20mA

0-355°electrical range

3 VDC excitation minimum

0-357°electrical range

3 VDC excitation minimum

0-355°electrical range

10-30VDC

+/- 3.0°

0.6 mph (0.27 m/s) 1° +/- 1.0%

0-135mph (0 to 60 m/s)-40to 160° F(-40to 70° C)0-100%

8.5" (21.6 cm) 6.75" (17.2 cm) 13" (33 cm)

0.5 lbs (0.23 kg) less cable APEC 3 or better

Screw attachment, 10-32machine screw

60' (18.3 m) 3 conductor 22 gauge

3 year

FEATURES & 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 & MAINTENANCE

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. 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, Light, 10K

TD-4A

Wind Direction Sensor, Light, 4-20mA

* Sensor is designed to work withTV-4series wind speed sensors.

Optional Parts / Accessories

Cable Additional Cable

MODEL TV-4WIND SPEED SENSOR

DESCRIPTION

The Texas Electronics, Inc. TV-4Wind 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-4wind speed sensor is a freestanding device for measuring air velocity. The sensor consists of a lightweight3-cupanemometer, 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-accuracyis 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:

0-100mph

 

 

Signal Presentation:

Pulsed DC output - light chopper

 

 

 

AC Frequency, or Analog, 4-20mA

 

 

 

(Please specify)

 

 

Pulsed DC output:

20-slotdisc

Input Power:

+5.0 VDC @ 5mA (typical)

 

1 MPH = 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 4-20mA out:

4 mA = 0 MPH

Input Power:

10-36VDC

 

20 mA = 100 MPH

 

 

Performance:

 

 

 

Accuracy:

+/- 2.0 mph (0.89 m/s)

 

 

Distance Constant:

> 21.7' (6.6 m)

 

 

Starting Threshold:

0.6 mph (0.27 m/s)

 

 

Environmental:

 

 

 

Operational Envelope:

0-135mph (0 to 60 m/s)

 

 

Temperature:

-40to 160° F(-40to 70° C)

 

 

Relative Humidity:

0-100%