The Hydrolab HL4 is the next generation multiparameter water quality sonde from OTT Hydromet. Know the instrument is working correctly and troubleshoot quickly. Streamline calibration tasks and produce valid, scientifically defensible conclusions.
Use with the Hydrolab Surveyor HL for attended monitoring, or for unattended continuous monitoring applications, the HL4 has on-board data logging and dedicated communications modules for easy integration with external loggers and telemetry.
The next generation multiparameter water quality instrument
SDI-12, RS-485, RS-232, TTY, USB
Advantages
Self-monitoring system reports the status of the instrument, flags the data, and shows the user where the problem is with assistance on how to solve the issue
User-scheduled calibration and maintenance intervals indicate when they are due
Guided and semi-automated calibration routines lead the user through the calibration process
Calibration results are stored with date and time, calibration type, user identification, and user notes
Check Calibration process allows the user to verify calibration and store the results
Calibration reports contain information about previous calibrations and calibration checks
Sensor status is saved with every line of data and is contained in the log file
Dedicated communications modules allow easy integration with data loggers and telemetry systems
Compatible with the Surveyor HL – a fully IP67 handheld designed for field use with a full-color screen that is visible in direct sunlight
Examples of Use
For measurement of popular water quality parameters in:
Freshwater rivers and streams, lakes and reservoirs, and groundwater wells
Salt or brackish water bays, estuaries, and near-coastal areas
Attended monitoring, continuous unattended and real-time monitoring
Technical Data
Sensors
Temperature sensor and up to four additional sensors plus depth and ORP
Electrical
External
6 … 30 VDC (12 VDC nominal) applied to the communications module,
12 VDC: 250 mW average, 19 W peak
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