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HL4 Multiparameter Sensor

HL4 Multiparameter Sensor



Lightweight, portable and flexible, perfectly suited for spot monitoring and short-term studies. HYDROLAB® sensor include intuitive software for unmatched usability, exceptional power performance and proven sensor options, all delivering high data quality and reliability.

Know the instrument is working correctly and troubleshoot quickly. Streamline calibration tasks and produce valid, scientifically defensible conclusions

  • Attended, Unattended
  • Temperature, Conductivity, Depth, pH, Dissolved Oxygen (LDO), Turbidity, ORP
  • The next generation multiparameter water quality instrument
  • SDI-12, RS-485, RS-232, TTY, USB


Ease of portability between sites and installation

  • Lightweight design readily accesses difficult locations
  • Compact size easily fits inside protective housing e.g, 2” wells
  • Durable design provides long term usage for a variety of applications

Perfect for spot monitoring and short term monitoring studies

  • Internal memory of 4GB for logging data
  • Optional internal battery pack
  • Flexible sensor choice depending on application

Easy to use instrument management and control software

  • Guided calibration tasks and instructions
  • Real time measurements in graphical and tabular formats
  • Define vertical profiling and sensor stability criteria



Diameter: 4.44 cm (1.75 in.) without rubber bumpers; 5.33 cm  (2.1 in.) with rubber bumpers

Length: 51.43 cm (20.25 in.) with no internal battery pack and standard sensor guard

Length: 66.36 cm (26.125 in.) with no internal battery pack and extended sensor guard

Length: 62.23 cm (24.5 in.) with internal battery pack and standard sensor guard

Length: 77.787 cm (30.625 in.) with internal battery pack and extended sensor guard

Weight: 2.2 kg (5 lb) with internal battery pack, one D-cell battery

Sensor Ports

6 sensor ports available

2 fixed sensor ports for temperature and optional depth sensor only

4 ports for integrating other sensor options

Parameters available depends on sensor installed

Maximium of 2 ports available for optical dissolved oxygen and another optical sensor

Power Requirements

 6–24 VDC (12 VDC nominal) applied to the communications module, 12 VDC:250 mW average, 18 W peak

Battery Life**

75 days

**HL4 Battery Life – One internal alkaline D-cell battery, non- rechargeable. Approximately 75 days of use with a 15-minute logging interval and the default warm-up time with depth, temperature, conductivity, pH and LDO sensors installed at room temperature