Models 6541C and 6547A
The 6541 precision water level instrument is a high accuracy float and pulley based shaft encoder instrument for measuring the level of water in many different applications. Float-operated instruments can be the most accurate way to monitor water levels, and they are the most common method to measure river levels. The Unidata 6541 precision water level instrument can achieve operating accuracy and resolution of 0.2mm with high stability and minimum drift.
This accuracy is maintained for the service life of the instrument without calibration or maintenance, apart from battery changes. The 6541 has the range to monitor surface and underground waters and the precision to monitor rainfall and evaporation.
The water level instrument is normally connected to the surface of the water by a float system. As the water level changes, the input shaft rotates. An optical encoder is mounted on the input shaft. On installation, the instrument is set to display the water level.
The encoder is continuously monitored as the instrument tracks water level changes. These changes update the LCD display and the readings can be recorded by an associated datalogger.
The very low mechanical friction and inertia of the instrument means that it can produce data with high precision and accuracy. A replaceable battery pack powers the instrument for more than twelve months. Practical design and rugged construction ensures easy operation and long service life.
The 6547 radar water level sensor provides continuous water level measurement of water in rivers, streams, open waste water channels, storm water overflow tanks and pump stations. The 6547 is a radar sensor which provides accurate long term measurements of water level up to 8m range from the sensor.
The radar sensor emits extremely short microwave pulses through the antenna. The emitted signal is reflected by the medium/water and then received as an echo by the antenna. The time between the emitted and received signal is proportional to the distance and is outputted as measured value. The sensor is normally mounted vertically with a bracket mounted on a structure with the sensor pointing downwards. The 6547 is almost maintenance-free due to non-contact measuring principle and is protected by a IP 68 housing.
Radar readings are unaffected by change in temperature and pressure making this instrument ideal for use is difficult process conditions.
When used with a companion Unidata IP data logger, collected data is transmitter to a central Neon server where data can be viewed on the Neon Web server in near real time from any browser. Same data can be reported to other systems using email, ftp, and web services.
6541C Precision Water Level Instrument
Material: Powder coated aluminium mounting with Polycarbonate Enclosure IP66
Size: 180mm x 140mm x 275mm (LxWxH)
Weight: 2.7kg (including battery)
Operating temperature: -10°C to 60°C
Battery: 6 x 1.5V industrial grade D size Alkaline battery pack 6910A (non-rechargeable)
Battery life: up to 1 year (based on daily schedule)
External power: External battery power 7-15VDC may be connected
Range: Standard 0m-65.5m or -199.999m to 199.999m
Accuracy: 1mm, 0.2mm or 0.1inch depending on the chosen float pulley size
Resolution: 1mm, 0.2mm or 0.1inch depending on the chosen float pulley size
I/O: 2 x HSIO bi-directional channels, Up to eight instruments can be daisy chained
SDI-12: SDI-12V 1.3 recorder (1200 baud smart instrument channel)
LCD Type: Reflective grey no backlight
Display Format: One line x 6 Characters, 7 segments
Optimum Viewing: 6 o’clock
Cable: 5m 8 core data cable
Storage memory: Low power CMOS RAM 512k standard
RAM Back up battery: Lithium Battery 3V, 950mAh
Time clock: Crystal regulated, +/- 10 seconds/month
Scan rates: Programmable from 5 seconds to 5 minutes
Log intervals: Programmable from 5 seconds to 24 hours
CPU: 80C552 microcontroller, 14.7456 MHz
6547 Radar Water Level Sensor
Material: Valox PBT or PP Enclosure IP68
Size: Diameter 93mm. Length 243mm
Operating temperature: -40°C to 60°C
External power: 12V-35VDC
Range: Standard 0m-8m
Frequency Range: K-band
I/O: 4-20mA two wire
Cable: 6m or more if required of 2 core + Kevlar relief wire.
|6541C-10||Water Level Instrument with 500mm Pulley|
|6541C-11||Water Level Instrument with|
500mm Pulley and 6910A Alkaline Battery Pack
|6541C-11-C||Water Level Instrument with MicroLogger 8010C, 500mm Pulley and 6910A Alkaline Battery Pack|
|6541C-20||Water Level Instrument with 12in Pulley|
|6541C-21||Water Level Instrument with 12in Pulley and 6910A Alkaline Battery Pack|
|6541C-21-C||Water Level Instrument with MicroLogger 8010C 12in Pulley and 6910A Alkaline Battery Pack|
|6541C-30||Water Level Instrument with 100mm Pulley|
|6541C-31||Water Level Instrument with 100mm Pulley and 6910A Alkaline Battery Pack|
|6541C-31-C||Water Level Instrument with MicroLogger 8010C|
100mm Pulley and 6910A Alkaline Battery Pack
|6541C-CL||Additional parts for 4-20mA option|
|6541D-I||Imperial Beaded Floatline 3 inch spaces fits 12in Pulley|
|6541D-M||Metric Beaded Floatline, 125mm spaces fits 500mm Pulley|
|6541E||Unbeaded Floatline, 0.4mm dia fits 100mm Pulley|
|6541F-115||Float Assembly 115mm Cylinder|
|6541F-170||Float Assembly 170mm Cylinder|
|6541F-60||Float Assembly 60mm Cylinder|
|6541F-90||Float Assembly 90mm Ovoid|
|6547A||Radar Water Level Sensor|
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