Key facts
- Brand
- Rotronic
- Model
- HL21
- Documents
- 3
- Languages
- EN
- Last added
- 2023-10-16
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Rotronic HygroLog HL20 and HL21 Data Logger User Guide
The document provides instructions for using the HygroLog HL20 (humidity and temperature logger) and HL21 (temperature logger). It details general descriptions including models with or without optional LC displays, required accessories like the AC3006 cable and HW4 software, and battery management. Key operational features include real-time clock settings, memory capacity of 20,000 values, function key usage for logging control, and status indicator LEDs.
Read onlineRotronic HL21 specifications
| Relative humidity range | 0 to 100 %RH, non condensing |
|---|---|
| Temperature range (no display) | -10 to 60°C (14 to 140°F) |
| Temperature range (with display) | 0 to 50°C (32 to 122°F) |
| Memory capacity | 20,000 pairs of values |
| Power source | Three AA batteries (1.5V) |
Source: Rotronic HygroLog HL20 and HL21 Data Logger User Guide
All Rotronic HL21 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What software is required to configure the logger?
A PC with the ROTRONIC HW4 software installed (version 2.4.0 or higher).
From: Rotronic HygroLog HL20 and HL21 Data Logger User Guide
How long can the real-time clock run without batteries?
Up to 4 hours after initial charge.
From: Rotronic HygroLog HL20 and HL21 Data Logger User Guide
What is the battery lifetime of the data logger?
Battery life depends on usage; models without display last up to 20 months, while those with display and sleep function enabled last about 13 months.
How do I start or stop data logging?
Press the function key for a few seconds (long press) to start or stop data logging.
How long do the batteries last?
Battery lifetime depends on usage; models without an LC display can record data for up to 20 months, while those with a display and sleep function enabled last about 13 months.
From: Rotronic HygroLog HL20 and HL21 Data Logger User Guide
Does the logger have an on/off switch?
No, the HL20 and HL21 do not have a power on/off switch because they must always keep track of the date and time.
From: Rotronic HygroLog HL20 and HL21 Data Logger User Guide