It introduces the function and usage of ROTRONIC HygroLog HL20/21 data logger.
This document provides short instructions for the installation and main functions of the ROTRONIC HygroLog HL20/21 data logger. The device records relative humidity and temperature values, with the HL20 model recording up to 20,000 pairs of values and the HL21 model recording up to 20,000 temperature values.
| Recording capacity (HL20) | 20000 value pairs (%rh + °C) |
|---|---|
| Recording capacity (HL21) | 20000 values (°C) |
| Measuring range | 0…100 %rh / -10...60 °C |
| Measurement accuracy at 23 °C | ±0.8 %rh / ±0.2 °C |
| Battery type | 3 x AA (1.5 V) alkaline |
| Weight | About 210 g (7.4 oz) |
The HL20 data logger can record up to 20,000 pairs of relative humidity and temperature values.
Press the function key for a few seconds to start or stop recording.