Temperature - Hobo pendant temperature logger
Parameter to be measured
Temperature
Method
Using self-recording temperature sensors it is possible to measure the temperature continuously. The loggers can be positioned in different heights. The result is a sample of tempareature dates and the connected calendar dates. the result are temperature values in °C.
Equipment
The HOBO Pendant Temperature Data Logger/ Doc # 9531-D, MAN-UA-001/ Onset Computer Corporation is a waterproof, one-channel logger with 10-bit resolution nd can record up to approximately 6,500 (8K model) or 52,000 (64K model) measurements or internal logger events. The logger uses a coupler and optical base station with USB interface for launching and data readout by a computer.
- Measurement range: -20°C to 70°C (-4° to 158°F)
- Accuracy: +/- 0.47°C at 25°C (+/-0.85°F at 77°F)
- Resolution: Temperature: 0.10°C at 25°C (0.18°F at 77°F)
- Drift: Less than 0.1°C/year (0.2°F/year)
- Response time: Airflow of 2m/s (4.4 mph): 10 minutes, typical to 90%; Water: 5 minutes, typical to 90%
- Time accuracy: +/- 1 minute per month at 25°C (77°F)
- Weight: 18 g
- Dimensions: 58 x 33 x 23 mm (2.3 x 1.3 x 0.9 inches)
Advantages
Continous measurement; Usage is easy; Position and number of loggers at the location is optional
Disadvantages
If there are several loggers placed on in location and they are connected by a bar, it influences the measurement results. If there is snow, the bar may push on melting around the loggers because of water runnning down the bar.
In the opposite snow can stay longer on the loggers surface while it is melting in the surrounding area.
What to watch out for
The loggers must be observed from time to time, to avoid disturbation of the measurements, e.g. a defect battery.
Problems/Questions
If there are several loggers in one location it is nearly impossible to start all loggers exactly at the same time. So before working with the data it has to be standardised.
Links
Projects that used the above equipment:
Other related web sites: