The 109 is a rugged, accurate probe that measures air, soil, and water temperature for a variety of applications. It consists of a thermistor encapsulated in an epoxy-filled aluminum housing. The housing protects the thermistor, allowing you to bury the 109 in soil or submerge it in water. The 109 measures from -50° to +70°C, and it outputs a 0 to 2.2 V signal when using 2500 mV excitation.
- Measures air, soil or water temperature
- 109-L Temperature Probe designed to operate with the CR200 data loggers
- Incorporates a thermistor as the active element
| Output | Analog |
| Operating Temperature Range | -50° to +70°C |
| Sensor Description | Measurement Specialties™ 10K3A1iA Thermistor |
| Tolerance | ±0.2°C (over 0° to 70°C range) |
| Temperature Measurement Range | -50° to +70°C |
| Steinhart-Hart Equation Error | ≤ 0.03°C (-50° to +70°C) |
| Interchangeability Error | ±0.1°C (over 0° to 70°C range increasing to ±0.5°C at -50°C) |
| Time Constant in Air | 30 to 60 s (in a wind speed of 5 m s-1) |
| Maximum Submergence | 15 m (50 ft) |
| Maximum Cable Length | 305 m (1000 ft) |
| Probe Length | 10.4 cm (4.1 in.) |
| Probe Diameter | 0.76 cm (0.3 in.) |
| Weight | 136 g (5 oz) with 3.05-m (10-ft) cable |
