Ocean and River Instruments

Logger version conductivity and temperature sensor INFINITY-CT A7CT-USB

Infinity-CT is an autonomously deployable data logger for temperature and salinity measurements. The conductivity sensor has a design of 7-electrode. The small-sized instrument (Φ54mm x 255mm, 0.7kg in air) can be deployed and integrated virtually anywhere. The instrument has two depth rating versions: shallow water (200m, A7CT2-USB) and deep water (2,000m, A7CT-USB).

Brochure Download

Sensor Specifications

Model Name A7CT2-USB (Shallow version)* A7CT-USB (Deep version)
Parameter Temperature Conductivity Temperature Conductivity
Principle Thermistor 7-electrode Thermistor 7-electrode
Range -3 to 45℃ 0.5 to 70mS cm-1 -3 to 45℃ 0.5 to 70mS cm-1
Resolution 0.001℃ 0.001mS cm-1 0.001℃ 0.001mS cm-1
Accuracy ±0.05℃
(0 to 35℃)
±0.05mS cm-1
(28 to 65mS cm-1)
(0 to 35℃)
±0.01mS cm-1
(28 to 65mS cm-1)

*Ask if you need to measure conductivities in fresh water.

Logger Specifications

Model name A7CT2-USB A7CT-USB
Memory medium miniSD card *waterproof & high speed type
Data capacity 1GB provided as standard (miniSD card)
AD converter 16 bit digital conversion
Measuring mode Continuous mode, Burst mode
Measuring interval 0.1 to 600 s
Burst sampling interval 1 to 1,440 min
No. of samples 1 to 18,000
Battery CR-V3 lithium / 3.3Ah (two maximum)
Communication USB 2.0 ( ver. 1.1 compatible)
Current consumption 90mA
Housing material Titanium (grade 2)
Dimensions Φ54mm×255mm(including sensor guard)
Weight Approx. 0.7kg in air, 0.3kg in water
Depth rating 200m depth equivalent 2,000m depth equivalent



*All the specifications are subject to change without notice. Please contact us for more information.

Ocean and River Instruments

  • JFE Advantech
  • Service and Support Phone:+81-798-66-1783 Fax:+81-798-66-1654
  • Request for documents