Water Depth Probes and Tipping Bucket Flow Gauge

Models 6506G, 6506H, 6548A and 6549A

  • Overview

    Unidata 6506G/H tipping bucket flow gauge is sturdily constructed from polished stainless steel. The tipping mechanism is manufactured from stainless steel and is of solid construction, ensuring that tips are accurate and consistent in volume.

    The 6506G/H is supplied with a single-reed switch as a detector. This requires no power and is a simple two-wire connection and is usually the easiest to connect to dataloggers, including the Unidata Neon Remote Loggers. A tipping bucket is pre-calibrated to a 75ml/tip or a 130ml/tip but it can be calibrated to any volume from 75ml to 130ml per tip.

    The 6548 submersible level transmitter measures the height of liquid above the position in the tank, well or borehole, referenced to atmospheric pressure. The sensor has a slim body design, ideal for narrow space applications like boreholes. It has good chemical compatibility and lightning and surge protection.

    The transmitter has a piezoresistive sensing element, encased in stainless steel 316 housing. A bullet nose design protects the diaphragm from damage. The 6548 incorporates lightning and surge protection that utilises dual arrestor technology, grounded to case, which eliminates both power supply surges and lightning ground strike transients. Lightning and surge protection is not guaranteed and is not covered by a warranty.

    When used with a proper intrinsically safe Zener barrier the 6548 is UL approved intrinsically safe for use in hazardous locations. The level transmitter comes equipped with a strong tensile strength shielded and vented cable. The vent tube in the cable automatically compensates for changes in atmospheric pressure above the water level. The vent is protected with a maintenance-free filter that stops water droplets or vapour from entering the transducer.

    The 6549 MODBUS water level sensor is a pressure sensor-based instrument for measuring water depth in many applications. It has a cable with a vent tube for atmospheric pressure compensation. The 6549 water level sensor provides accurate long term measurements of water depths of 0m to 10m with an accuracy of 0.1% full scale. The sensor communicates via Modbus RTU RS485 protocol. The 6549 water level sensor is fully sealed and temperature compensated. A hermetically sealed stainless steel 316 case with a protection type IP 68 allows the pressure sensor to be immersed down to a depth of 10m.

    The inner vented connection cable makes pressure compensation of the measuring cell against the atmosphere possible, thus hydrostatic pressure measurement. The submersible pressure sensor meets the electromagnetic compatibility (EMC) requirements of EN 61326. The mechanical fastening of the pressure sensor does not require any additional strain relief, as the construction of the cable is suitable to take a maximum tensile force of 1000 N. The cable’s individual signal wires are epoxy sealed into the casing to protect against water ingress. The probe comes with the inbuilt surge/lightning protection, which makes this probe ideal for monitoring drainage, bore depth and river height. It can also measure water with dissolved solids and other liquids.

    water monitoring tipping bucket flow gauge 6506G&H
    The sensor in a slim body design, ideal for narrow space applications like bore holes. It has good chemical compatibility and lightning and surge protection.
    6549 MODBUS Water Level Sensor

  • Specifications

    6506G and 6506H

    Physical specifications

    Material: Marine Grade 316 Stainless Steel
    Size: 400mm x 300mm x 155mm (LxWxH)
    Weight: 2.7kg net
    Operating temperature: -20°C to 60°C
    6506G – up to 3 litres/minute
    6506H – up to 3 litres/minute
    Bucket Capacity:
    6506G – 75ml per tip
    6506H – 130ml per tip
    Signal Element: Single reed switch
    Cable: 5m of 2-way instrumentation screened cable – PVC


    Physical specifications

    Material: Stainless Steel 316 Enclosure IP68, bullet nose PVC
    Size: Diameter 25.40mm x Length 177mm
    Weight: ~1.00kg depending on cable length
    Operating temperature: -18°C to 60°C

    Electrical specifications

    External power: 12V-35VDC
    Depth Range: 3.5m, 5m and 10m
    Accuracy: ±0.25% FS
    Max Operating Pressure: 2 x full scale
    I/O: 4-20mA two-wire
    Cable: Custom lengths of 3 core + breather tube, submersible cable


    Physical specifications

    Material: Stainless Steel 316 Enclosure IP68
    Size: Diameter 27mm x Length 146mm
    Weight: ~230g depending on cable length
    Operating temperature: -40°C to 80°C
    Compensating temperature: -10°C to 70°C
    Temperature Drift: Typically 0.03% FS /°C, Max 0.05% /°C

    Electrical specifications

    External power: 10V-30VDC
    Depth Range: 10m
    Accuracy: ±0.1% FS
    Long Term Stability: Typically 0.1% FS / Year, Max 0.2% FS / Year
    I/O: MODBUS RS485, 32bit IEEE floating point
    Cable: 30m PUR Vented Cable

  • Ordering Information

    Model Description
    6506G Tipping Bucket Flow Gauge, 75ml per tip
    6506H Tipping Bucket Flow Gauge, 130ml per tip
    6548A-A Submersible Level Transmitter 3.5m
    6548A-B Submersible Level Transmitter 5m
    6548A-C Submersible Level Transmitter 10m
    6548A-CBL Submersible Level Transmitter Cable/meter - cable length
    to be specified at the time of order
    6549A MODBUS Water Level Sensor 10m

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    If you are experiencing difficulties using the form, please email us your enquiry to info@unidata.com.au

    • Documents