Rotronic HL-20D Humidity and Temperature Data Logger
Rotronic HL-20D Humidity & Temperature Data Logger
High-accuracy humidity and temperature data logger with 20,000-point memory, ±0.8% RH accuracy, ±0.3°C temperature accuracy, LCD display, and long battery life.
The Rotronic HL-20D is a compact and reliable data logger designed for humidity and temperature monitoring in logistics, storage, production areas, and display applications. It uses the Hygromer® IN-1 sensor and PT100 RTD Class A, providing excellent accuracy and long-term stability. With 20,000 data pairs, an LCD display, an IP40 ABS housing, and HW5 software compatibility, it is ideal for high-quality environmental documentation.
Key Features
Humidity accuracy:
±0.8% RH @ 10–60%
±1.3% RH @ 0–10% and 60–100%
Temperature accuracy: ±0.3°C @ 23°C
Long-term stability:
<1% RH/year
<0.1°C/year
20,000 data point memory with date/time
Logging interval: 5 sec to 1 hour
Start-stop or Loop logging modes
LED status indicators for alarms & logging
LCD display with 1–2 decimals, backlight
Battery life: ~13 months @ 30-min interval
UART service interface (up to 5 m cable)
Compact and easy to wall-mount
Technical Specifications
| Parameter | Specification |
|---|---|
| Humidity Range | 0…100% RH (non-condensing) |
| Sensor | Hygromer® IN-1 |
| Accuracy | ±0.8% RH (10–60%), ±1.3% RH otherwise |
| Temperature Range | 0…50°C |
| Temp Accuracy | ±0.3°C |
| Dew/Frost Point | Calculated |
| Logging Memory | 20,000 value pairs |
| Logging Interval | 5 sec to 1 hour |
| Display | LC display, backlight |
| Interface | UART |
| Battery | 3 × AA alkaline |
| Battery Life | ~13 months @ 30-min interval |
| Housing | ABS |
| IP Rating | IP40 |
| Dimensions | 130 × 72 × 32 mm |
| Weight | ~210 g |
Applications
Logistics & cold-chain
Production & warehouse monitoring
Museums, buildings, test rooms
Environmental study & documentation
What’s in the Box
HL-20D data logger
3 × AA battery
Factory calibration certificate
Wall-mount screw and dowel
Instruction manual
FAQ
Q: Does HL-20D record dew point?
Yes—dew or frost point is calculated internally.
Q: Does it support continuous logging?
Yes—Start/Stop and Loop modes are available.
Q: Can the battery be replaced easily?
Yes—it runs on standard AA alkaline cells.
Q: What software is required?
HW5 (free evaluation version available).