The Datalogger Type 575-II is the successor model of the long-standing field-proven Type 575 for measuring and recording water level and temperature in groundwater wells and surface water stations. First, the slimmer diameter of 22mm catches the eye, now this Groundwater Datalogger can also be used in 1-inch groundwater observation wells. In addition of a large flash memory, the circuit has been designed to extremely low power consumption. Therefore, we can now make an extended promise: 10 years and 3 million measurements without replacing the battery!

The operating concept was also revised with this new groundwater datalogger. From now on, HT Dataloggers can be excellently operated on touch displays, without touch pen and without keyboard.

Technical Data

Water Level

Measuring range

selectable up to max. 300m water column


Standard: 1 cm / Option: 1 mm


< 0.05% of selected measuring range


Measuring range

-5°C to +50 °C / Option: -5°C to +70°C



Other data


Flash memory 4MB, non-volatile, for min. 338,600 records

Power supply

Integrated lithium battery / sufficient for 10 years and 3,000,000 measurements; exchangeable at the factory

Measuring interval

Adjustable: 1 minute to 99 days / Optional: from 1 second, up to 10 intervals preselectable

Length of cable

individually selectable up to max. 500 m

User interface

RS 232; can be addressed via serial and USB interface

Dimensions Probe

Ø22mm x 175mm

Dimensions converter unit

Ø24mm x 140mm

Operating temperature

-30°C to +70°C / probe in ice-free area

File format

User selectable; ASCII; Excel; ZRXP; MIS; Labdüs and many more
Individual formats configurable by adapting from our software department;


  • Maintenance free - no desiccant / dry cartridges required
  • Compact design with Ø 22mm for installation in pipes from 1 inch
  • Check measurements by a Water Level Meter are possible from 2-inch without removal of the Datalogger from the pipe
  • Flood-proof converter unit - permanently up to 3m water column
  • Power supply for 10 years operation and 3,000,000 measurements
  • Made of high class stainless steel
  • Secure installation, with each pipe diameter


  • Long-term monitoring of groundwater level and temperature
  • Level measurement on surface waters, also in use as a redundancy system
  • Recording of level and temperature during pumping tests
  • Slug & Bail tests
  • For continuous water level measurements in a measuring weir or channel
  • in water reservoirs and tanks
  • Documentation of water table drawdown
  • Construction site and landfill monitoring