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Water Products

• Class A Evaporation Pan
• MEA2173 Thermistor String
• Pressure Sensor
• Starflow Ultrasonic Doppler Instrument
• Water conductivity instrument
• Water Level Instrument shaft encoder

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Water Level Instrument shaft encoder

Float-operated instruments can be the most accurate way to monitor the level of a water surface. The 6541 Precision Water Level instrument can achieve an operating accuracy and resolution of 0.2mm.

This accuracy is maintained for the service life of the instrument without calibration or maintenance, apart from battery changes. Each instrument has the range to monitor surface and underground waters, and the precision to monitor rainfall and evaporation.

This Model 6541 instrument and its predecessors has been the choice of experienced professionals at more than 1,000 sites worldwide since introduction in 1985. The instrument is normally connected to the water surface by a float system. As the water level changes this rotates the input shaft on which is mounted an optical encoder. At installation the instrument is set to display the water level on its LCD screen.

The encoder is continuously monitored and the instrument tracks any water level changes. These changes update the LCD screen and the displayed reading can be recorded by an associated data logger. The very low mechanical friction and inertia of the instrument produces data of high precision and accuracy. A replaceable battery pack powers the instrument for more than 1 year. The practical design and rugged construction ensures easy operation and a long service life.

The water level instrument can be supplied as a sensor only, or with a built in data logger.

Specifications
Range:	Standard 0 to 65.5 metres. Switch to 13.1m or 65.5 feet.
Resolution:	1.0 mm, 0.2mm or 0.01 foot, depending on float pulley used.
Accuracy:	Same as resolution with suitable float system
Tracking:	Up to 500mm / second.
Display:	6-digit LCD
Temperature:	-40°C to +60°C
Humidity:	0-100%, non-condensing
Output:	High speed serial signal UNIDATA HSIO standard. Options for SDI-12, 4-20 mA and dual HSIO channels. Up to 8 instruments can be daisy chained.
Power:	Internal Alkaline battery pack. Expected life exceeding 12 months. Exchange pack UNIDATA Model 6901A. External battery power 9-15 V DC can be connected
Cable:	5 metres (supplied) Up to 30 metres may be used.
Size:	180mm x 275mm x 140mm (W x H x D)
Weight:	2.7 kg, including battery
Construction:	Exterior PVC, Aluminium and stainless steel
Enclosure:	Sealed PVC, IP65