Precision Water Level Instrument

Model 6541C

  • Overview

    The Model 6541C Precision Water Level instrument can achieve 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.

    This instrument has the range to monitor surface and underground waters, and the precision to monitor rainfall and evaporation.
    The instrument is normally connected to the water surface 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 data logger.
    The very low mechanical friction and inertia of the instrument mean that it can produce data with high precision and accuracy. A replaceable battery pack powers the instrument for more than six months. A practical design and rugged construction ensure easy operation and long service life.

    Key features of the 6541C Precision Water Level instrument are

    • Displays water level continuously
    • Smaller and easier to install and operate
    • Adjustable LCD display, reverse rotation, change scale and reset
    • Simple battery exchange system
    • Low battery indication

    The 6541C Precision Water Level Instrument is available in a number of models. The key differentiating features are the:

    • Presence or absence of a Micrologger assembly
    • Presence or absence of an internal battery
    • Pulley diameter
    • Float size and shape
  • Specifications

    Range: Standard 0 to 65.5 metres. Switch to 13.1 metres or 65.5 feet
    Resolution: 1.0mm, 0.2mm or 0.01 foot, depending on the float pulley used
    Accuracy: Same as resolution when a suitable float system is used
    Tracking: Up to 500mm/second
    Display: 6 digit LCD
    Temperature: -10° to 60°C
    Cable: 5 metres (supplied). Up to 30 metres can be used
    Size: 275mm x 180mm x 140mm (H x W x D)
    Weight: 2.7kg (including battery)
    Enclosure: Rigid PVC IP67
    Output: SDI-12 and Dual STARBUS HSIO standard. Option for programmable 4-20mA output
    Power: Internal alkaline battery pack (Model 6910A)
    Battery life expectancy is 12 months. External battery power 9-15VDC can be connected

  • Ordering Information

    ModelDescription
    6541C-­10Water Level Instrument with 500mm Pulley
    6541C-­11Water Level Instrument with
    500mm Pulley and 6910A Alkaline Battery Pack
    6541C-11-CWater Level Instrument with MicroLogger 8010C, 500mm Pulley and 6910A Alkaline Battery Pack
    6541C-­20Water Level Instrument with 12in Pulley
    6541C-­21Water Level Instrument with 12in Pulley and 6910A Alkaline Battery Pack
    6541C-21-CWater Level Instrument with MicroLogger 8010C 12in Pulley and 6910A Alkaline Battery Pack
    6541C-­30Water Level Instrument with 100mm Pulley
    6541C-­31Water Level Instrument with 100mm Pulley and 6910A Alkaline Battery Pack
    6541C-31-CWater Level Instrument with MicroLogger 8010C
    100mm Pulley and 6910A Alkaline Battery Pack
    6541C-CLAdditional parts for 4-20mA option
    6541D-IImperial Beaded Floatline 3 inch spaces fits 12in Pulley
    6541D-MMetric Beaded Floatline, 125mm spaces fits 500mm Pulley
    6541EUnbeaded Floatline, 0.4mm dia fits 100mm Pulley
    6541F-115Float Assembly 115mm Cylinder
    6541F-170Float Assembly 170mm Cylinder
    6541F-60Float Assembly 60mm Cylinder
    6541F-90Float Assembly 90mm Ovoid

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  • Documents

    Brochures
    6541C Precision Water Level Instrument

    Manuals
    Unidata Manual – 6541C Precision Water Level Instruments

    Application Notes
    Irrigation channel measurement and control
    Air quality and dust monitoring
    Evaporation monitoring
    Rivers and streams monitoring
    Surface water monitoring
    Water level monitoring


water monitoring precision water level instrument 6541C