CS231-L SDI-12 Temperature Profiler

Customizable rugged, digital temperature measurements

The CS231 offers the same precise temperature profiling as our CS230 SDI-12 Temperature Profiler, but with a slimmer design for easier use in borehole and road applications. The CS231 requires a smaller installation hole when compared to the CS230. For road applications, this means easier drilling, as well as less time and material to backfill. 

The CS231 SDI-12 Temperature Profiler uses SDI-12 digital technology for simple integration. SDI-12 does away with analog measurement inaccuracies and susceptibility to electrical noise. The CS231 consists of a rigid probe assembly and up to four optional external temperature probes. The rigid probe assembly maintains the precise position of the temperature points within the profile, while protecting the temperature sensors in all mediums for the long term. 

The CS231 is suited for a wide variety of applications and environments. The completely sealed probe assembly and external probes permit the CS231 to be used in roadbeds, soils, and water (snow and ice).  

Applications where the CS231 is used include spring load adjustment, frost and permafrost monitoring, soil, and water or snowpack temperature profiling. 


When power is supplied to the CS231 probe, the internal electronics continuously measure the temperature at an approximate rate of one measurement per second. Every output measurement obtained from the sensor is a running average of 10 consecutive one-second readings. The accuracy specification is based on an average of 10 consecutive readings. For this reason, after the initial power up, it is recommended to delay 10 seconds to obtain the best accuracy. 

Because the sensor is obtaining a measurement every one second, it is recommended to use the Continuous measurement command to obtain the temperature readings. Using the “R” commands will reduce the time taken to obtain a reading with the SDI-12 protocol. 

Benefits and Features 

    • Lifetime min/max temperature recording 
    • User-resettable min/max temperature recording 
    • Automatic one-second temperature update 
Operating Temperature Range  -55° to +85°C 
Typical Accuracy  ±0.2°C (at -40° to +85°C) 
Worst Case Accuracy 
  • ±0.4°C (at -40° to +85°C) 
  • ±0.5°C (at -55° to -40°C) 
Resolution  0.0078°C 
Communications  SDI-12 
Supply Voltage  9 to 28 Vdc 
Warm-up Time on Power up  10 s 
Maximum Sensors per Probe  32 
Optional External Probes  4 maximum 
Cable Insulation  Polypropylene Pro-Fax 8623, 105°C 
Minimum Spacing  5 cm (1.97 in.) 
Maximum Length  3.0 m (118 in.) 
Probe Diameter  2.13 cm (0.84 in.) 
Maximum Cable Length  152 m (500 ft) 
Standard External Probe Length  45 cm (18 in.) 
Electronics Sealing Classification  IP68 

Current Consumption 

Quiescent Current Drain  1.0 mA (maximum per sensor) 
Active Current Drain  20 mA + (number of sensors * 1.0 mA ) 

CS231-L SDI-12 Temperature Profiler


CS230/CS231 Temperature Profilers


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