Texas Instruments SERIES 525 RAINFALL SENSORS, TR-525I, TR-525USW Description, Specifications

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:	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