CTD
It features a robust ceramic measuring cell for long term accuracy and has outputs for salinity and total dissolved solids (TDS). Its built in datalogger manages and stores all measurements at user-programmable intervals.
Application: Surface water, Groundwater
Measurement technology: Vented pressure cell and 4-electrode graphite conductivity cell
Parameters measured: Water level, Temperature, Conductivity
Product Highlights: Measures and stores water level, temperature, and conductivity data
Measurement range: Water level: 0 … 4, 10, 20, 40, and 100 m Conductivity: 0.001…2.000 mS/cm, 0.10…100.00 mS/cm
Accuracy: ±0,05 % FS
Internal data logger: Yes
- FEATURES
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- Outputs for conductivity include specific conductivity, salinity, and total dissolved solids
- Ceramic pressure cell provides industry-leading accuracy
- Conductivity, depth, and temperature measurements are combined into a single device that easily installs in a 1” or larger well or conduit
- 4 MB of memory provides capacity for over 500,000 data points—ideal for long-term deployments OR short-term, high resolution pumping studies
- Can be powered for over 18 months with off-the-shelf alkaline batteries or over 5 years with lithium batteries
- Ability to perform contact gauge control measurements without sensor removal, so no need to pull the cable for routine maintenance
- Complete in-well solution: all components are inserted into the groundwater well, eliminating the possibility of instrument vandalism
- Battery life: up to 5 years with lithium batteries, with alkaline options are also available.
- Long-term accuracy: a robust ceramic pressure cell will not deform over time, and an accurate 4-electrode conductivity measuring cell provides outputs for salinity and total dissolved solids (TDS)
- User-friendly interaction: only one program required to setup unit and download data, plus a simple infrared communication interface that provides easy on-site data download
- Simple Maintenance: Infrared interface, batteries, and desiccant are accessible at the top of the well or pipe and no tools are required
- Specs
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•SPECIFICATIONS
Water level measurement Measurement range: 0 … 4 m, 10 m, 20 m, 40 m, 100 m Resolution: 0.001 m / 0.1 cm / 0.01 ft / 0.1 inch/ 0.0001 bar / 0.001 psi Accuracy: ± 0.05 % FS Units: m, cm, ft, inch, bar, psi Temperature compensated operating range -5 …. +45 °C (ice free) Temperature measurement Measurement range: -25 … +70 °C Resolution: 0.01 °C Accuracy: ± 0.1 °C Conductivity measurement Measurement range selectable Measurement range 1: 0.001 …?2.000 mS/cm Resolution: 0.001 mS/cm Accuracy: ±0.5 % of measurement value; (min ±0.001 mS/cm) Units: mS/cm / µS/cm Measurement range 2: 0.1 …?100 mS/cm Resolution: 0.01 mS/cm Accuracy: ±1.5 % of measurement value; (min ±0.01 mS/cm) Units: mS/cm Electrical data Power supply Lithium or Alkaline batteries 3 x 1.5 V battery (LR6·AA, FR6·AA)
Lifetime (@ 1 h interval) with Lithium-batteries ≥5 years with Alkaline-batteries ≥1.5 years Interface Infrared (IrDA) Datalogger Memory 4 MB Amount of values approx. 500,000 Measurement interval 5 sec … 24 h Storage interval 5 sec … 24 h Installation ≥ 1″ Material ABS, POM, stainless steel 1.4539 (904 L) Weight Com unit (incl. bat) approx. 0.410 kg Sonde approx. 0.430 kg Dimensions Com unit L x Ø 400 mm x 22 mm Sonde L x Ø 317 mm x 22 mm Max system length 1.5 … 200 m ±1 % ±5 cm Storage temperature -?40 … +85 °C Protection class Communication unit IP67 (i.e max. 2 m, for max. 24 h) Sonde IP68 - Downloads
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Brochures 
brochure-71.pdf Download now Manuals 
CTD-Manual.pdf Download now