Isodaq Technology is now part of Hydro International.

Water Level Sensors

Our range of water level and depth level gauges have been selected to complement the Hydro-Logic™ Level Logger for many different surface and groundwater applications. We have selected instruments from manufacturers with an international reputation for quality of both the measurement technology and after-sales support services.

Not all sensor types are suitable for all level measurement applications; some, such as Pulsar and Vega, are best suitable for non-contact applications offering benefits of low maintenance in challenging environmental or installation conditions, whereas ther sensing methods such as our highly accurate float-weight-driven, shaft-encoders manufactured in Scotland by Thistle Design are suitable for larger diameter stilling-wells in large rivers and reservoirs.

For smaller diameter stilling-pipes and borehole tubes, we strongly recommend the depth pressure sensors manufactured in the UK by Impress Sensors including SDI-12 versions that also enable temperature measurement.

Products

  1. Level Troll 300

    Level Troll 300

    • Depth, level, pressure and temperature logger
    • Connects to Frog RX and tapole GPRS logger
    • Sensor accuracy of ±0.2% full scale
    • 18.3mm diameter stainless steel housing
    • Non-vented (absolute) depth sensor
    • 4-20mA, SDI-12, RS485 outputs

  2. AquaRead LeveLine

    AquaRead LeveLine

    • Low cost depth level logger
    • Absolute, gauge (vented) or barometric pressure models
    • Sealed 22mm diameter titanium probe
    • Internal 3.6V lithium battery, up to 10 years life
    • SDI-12 - Modbus link to Isodaq GPRS loggers

  3. LMK306

    LMK306 Submersible Level Transmitter

    • Ceramic pressure sensor
    • Suitable for boreholes, reservoirs and rivers
    • Use with Isodaq Frog R2/R3 or Hawk XT/RT loggers
    • 4-20mA / 2-wire and powered from 12 to 36V dc
    • Level ranges from 6mWG up to 200mWG

  4. /

    Level Troll 400

    • Deploy in sub-1 inch wells and other narrow enclosures
    • Integrate with telemetry systems,SCADA/PLC systems, and third-party data loggers and samplers
    • Non-vented (absolute)
    • 1.83-cm (0.72-in.) diameter titanium housing that is suitable for harsh environments
    • Includes built-in Modbus/RS485, SDI-12, and 4-20 mA

  5. Rugged BaroTroll Data Logger

    Rugged BaroTroll Data Logger

    • Can be connected to a telemetry system, SCADA/PLC system, controllers, or third-party data collection platform
    • 2.62-cm (1.03-in) diameter titanium housing is suitable for harsh environments
    • Modbus/RS485 or SDI-12 communication options

  6. VRS-20 radar level sensor

    VRS-20 SDI-12 radar level sensor

    • Non-contact sensor - no stilling-pipe needed
    • Suitable for deployment from bridges or towers
    • Use with any Isodaq logger via SDI-12
    • Accuracy - +/-10mm
    • Unaffected by temperature or radiation
    • Averaging facility for turbulent waters

  7. WL61 Radar Level Sensor

    WL61 Radar Level Sensor

    • Non-contact sensor - no stilling-pipe needed
    • Suitable for rivers/reservoirs via bridge/tower deployment
    • Use with Isodaq Frog R2/R3 or Hawk XT loggers
    • Accuracy - +/-2mm
    • Unaffected by temperature changes

  8. 24R-105 Optical Shaft Encoder

    24R-105 Optical Shaft Encoder

    • Float/weight wire operated system
    • Suitable for rivers/reservoirs via bridge/tower deployment
    • Use with Isodaq Hawk XT loggers
    • Accuracy - <+/-2mm
    • Float diameter options - 75mm - 150mm

  9. IMP Ultrasonic Level Sensor

    IMP Ultrasonic Level Sensor

    • ATEX non contact ultrasonic air-ranging sensor
    • Suitable for culverts, sewers and tanks
    • Use with ISODAQ Telemetry loggers
    • Accuracy is ± 0.25% or 6mm (whichever is greater)
    • ATEX zone 1 certification as standard

  10. SDI-12L Submersible Level Transmitter

    SDI-12L Submersible Level Transmitter

    • Level and Temperature output as standard
    • Stainless steel or Marine Bronze options
    • Suitable for tank, borehole, reservoir, river, sea, estuary
    • Use with Isodaq Frog R2/R3 or Hawk XT series loggers
    • Accuracy - <+/- 0.1% BFSL
    • Probe diameter - 25mm

  11. LMP307 Depth Pressure Sensor

    LMP307 Depth Pressure Sensor

    • Low cost submersible depth sensor
    • Suitable for boreholes, reservoirs and rivers
    • Use with Isodaq Frog R2/R3 or Hawk XT/RT loggers
    • Accuracy - <+/- 0.05% BFSL
    • Probe diameter - 25mm

  12. 4-20mA Submersible Level Transmitter

    4-20mA Submersible Level Transmitter

    • Low cost submersible depth sensor
    • Suitable for boreholes, reservoirs and rivers
    • Use with Isodaq Frog R2/R3 or Hawk XT/RT loggers
    • Accuracy - <+/- 0.05% BFSL
    • Probe diameter - 25mm
    • 4-20mA

  13. Rugged Troll 100, 200

    Rugged Troll 100, 200

    • Designed for groundwater and surface-water monitoring
    • Titanium construction for harsh conditions
    • Modbus, RS485 or SDI12
    • Linear, fast linear and event logging modes available

  14. Level Troll 700

    Level Troll 700

    • Integrated Modbus/RS485, SDI-12, and 4-20 mA communication protocols
    • Connects to Frog RX unit for use as low-cost GSM/GPRS telemetry outstation
    • Sensor accuracy of ±0.1% full scale

  15. Level Troll 500

    Level Troll 500

    • Integrated Modbus/RS485, SDI-12, and 4-20 mA communication protocols
    • Connects to Frog RX unit for use as low-cost GSM/GPRS telemetry outstation
    • Narrow diameter body (18.3 mm OD)
    • Sensor accuracy of ±0.1% full scale

  16. Pulsar DBi ultrasonic level sensor

    DBi Ultrasonic Level Sensor

    • Non contact Ultrasonic air-ranging sensor
    • Suitable for culverts, sewers and tanks
    • Use with ISODAQ Telemetry loggers
    • Accuracy is ± 0.25% or 6mm (whichever is greater)
    • ATEX zone 1 certification as standard

Applications