Rotronic - HL 20/21
Manufactured by Rotronic
Humidity temperature data loggers
The HL20 and HL21 are accurate humidity temperature data loggers designed for recording ambient conditions in indoor areas such as research laboratories, high-tech manufacturing facilities and warehouses, storage areas and containers for sensitive goods, museums, office buildings, etc.
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Features of HL 20/21
- HL20: records up to 20,000 pairs of relative humidity and temperature values
- HL21: records up to 20,000 pairs of temperature values
- Non-volatile EEPROM memory
Interface & Display
- Function key: starts and stops data logging, turns optional LC display on and off
- Optional LC display with backlight (values, message bar and battery charge indicator)
- Connector for data download, configuration and log function programming
Other Features
- English or metric unit system
- Real time clock powered for up to 4 hours without batteries
- Programmable alarm function (out-of-limit value)
- Status indicator (green and red LED).
- Display Sleep function: substantially extends the lifetime of the battery
- Simulator function (fixed output signals) for validating the recording function
- HL20: can be set compute and display the dew or frost point
General Specifications
Depth | 72 mm |
Height | 32 mm |
Width | 130 mm |
Weight | 210 g |
Additional Specifications
- Internal sensors (no apparent probe)
- Optional LC display
- 0 to 100 %RH
- Operating Range: -10…60 °C / 0…100 %rh
- Accuracy: ±0.8 %rh @ 10...60 %rh / ±0.3 K | ±1.3 %rh @ 60...100 %rh / ±0.3 K
- Calibration and adjustment functions
- 3 x AA batteries (1.5V)
- Up to 20 months of data recording without replacing the batteries.