109SS-L Stainless Steel Temperature Probe
109SS-L Stainless Steel Temperature Probe

The 109SS thermistor can survive temperatures up to 100°C, but the overmolded joint and cable should not be exposed to temperatures hotter than +70°C.

Water Temperature

The sensor can be submerged to 46 m (150 ft) or 63 psi. Please note that the 109SS is not weighted. Therefore, the installer should either add a weighting system or secure the sensor to a fixed, submerged object, such as a piling.

Soil Temperature

The 109SS is suitable for shallow burial only. Placement of the sensor’s cable inside a rugged conduit may be advisable for long cable runs—especially in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes.

Benefits and Features

  • Designed for harsh, corrosive environments
  • Fast response time
  • Wide temperature measurement range
  • Easy to install or remove
  • Compatible with most of our current and retired data loggers

The 109SS is a rugged, accurate probe that measures soil or water temperature from -40° to +70°C. The 109SS consists of a thermistor encased in a sheath made from grade 316L stainless steel. The rugged stainless-steel sheath protects the thermistor, allowing you to bury or submerge the 109SS in harsh, corrosive environments. This probe also has a fast time response, and it can be easily interfaced with our data loggers.

  • 109SS Stainless Steel Temperature Probe is measures temperature in harsh, corrosive environments
  • Thermistor sheathed in a stainless-steel casing
  • Maintains a fast response time
  • Measures temperatures from -40° to 70°C
  • Thermistor can operate in temperatures up to 100°C, however, the overmolded joint and cable should not be exposed to temperatures greater than 70°C.
Output Analog
Operating Temperature Range -40° to +70°C
  • Note: Overall probe accuracy is a combination of thermistor interchangeability, bridge-resistor accuracy, and error of the Steinhart-Hart equation. Interchangeability is the principle component error. If needed, an estimate of the interchangeability error for 0 to 50°C, that can be used as the Offsetparameter of the Therm109() instruction, can be determined with a 1-point or 2-point calibration.
  • ±0.60°C (-40 to +70°C)
  • ±0.49°C (-20 to +70°C)
Maximum Submergence 45.7 m (150 ft) or 434 kPa (63 psi)
Temperature Measurement Range -40° to +70°C
Thermistor Temperature Survival Range -50° to +100°C
Overmolded Joint and Cable Temperature Survival Range -50° to +70°C
Interchangeability Error
  • ±0.6°C tolerance (-40°C)
  • ±0.38°C tolerance (0°C)
  • ±0.1°C tolerance (25°C)
  • ±0.3°C tolerance (50°C)
  • ±0.4°C tolerance (70°C)
Steinhart-Hart Equation Error ≤ 0.02°C (-40°)
Time Constant in Air
  • 31 s (still air)
  • 7.5 s (air @ 3 m/s)
  • 0.5 s (antifreeze/water rolling)
Sensor Description Micro-BetaCHIP Probe 10K3MCD1, 0.5 mm (0.018 in.) diameter, 10 kohm at 25°C
Cable Description 0.56 cm (0.22 in.) diameter with Santoprene jacket
Cable/Probe Connection “ATUM” heat shrink, “Macromelt” overmolded joint
Stainless-Steel Sheath Diameter 0.16 cm (0.063 in.)
Stainless-Steel Sheath Length 5.84 cm (2.3 in.)
Overmolded Joint Diameter 1.02 cm (0.40 in.)
Overmolded Joint Length 4.24 cm (1.67 in.)
Weight 0.1 kg with 3.2 m cable (0.2 lb with 10.5 ft cable)


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