HygroLog HL20/21: Compact Humidity Temperature Data Logger

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.

Manuals & Documentation

• HL20/21 Data Sheet
• HL20/21 Manual & Specifications
• HL20/21 & HW4 Software
• Buy Online

General specifications

• Internal sensors (no apparent probe)
• Optional LC display
• 0 to 100 %RH
• 10 to 60°C (14 to 140°F) - models with LC display: 0 to 50°C (32 to 122°F)
• Accuracy: ± 0.8 %RH and 0.2 °C
• Calibration and adjustment functions
• 3 x AA batteries (1.5V)
• Up to 20 months of data recording without replacing the batteries.

Data Logging

• 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). The green side of the LED flashes every 5 seconds when logging is active. The red side of the LED flashes every 5 seconds when a measured value is out of limits or when the logger requires attention (low battery, memory full, major sensor failure – such as open or shorted sensor)
• 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

• Service Cable
• HW4 Software