This is the manual for the handheld hygrometer. It introduces the features and functions of the product, including relative humidity and temperature measurement, dew point and other psychrometric calculations, outstanding accuracy and repeatability, 2,000 data point memory, auto-diagnostics and automatic correction, highest possible measuring accuracy.
The HygroPalm21/22 series is a handheld instrument for measuring relative humidity, temperature and dew point. It features AirChip3000 technology, an ergonomic ABS housing, and a backlit graphic display for easy reading. The series includes the HygroPalm21 with an integral probe and the HygroPalm22 that accepts interchangeable HygroClip2 probes.
The manual covers technical information such as measurement ranges, accuracy, data logging, sensor diagnostics, and power options. It also describes available probe types, accessories, and software (ROTRONIC HW4) for data download, firmware updates, and compliance with FDA‑CFR21 Part 11.
| Measurement range | -10…60 °C / 0…100 % rh (probe up to -50…200 °C) |
|---|---|
| Resolution | 0.02 % rh / 0.01 K |
| Power supply | 9 V battery or mains adaptor |
| Power consumption | Typically 4 mA with backlight off |
| Data memory | Up to 2,000 measurement values |
| Display type | Graphic backlit display, configurable parameters |
| Battery indicator | Low battery indicator |
| Temperature sensor | Pt100 1/3 Class B |
| Probe cable extension | Passive max. 5 m, active up to 100 m |
The instrument measures from –10 °C to 60 °C and 0 % rh to 100 % rh, while the interchangeable probe can cover –50 °C to 200 °C.
The HygroPalm21/22 can store up to 2,000 measurement values in its internal memory.
It can be powered by a 9 V battery or an external mains adaptor.
Firmware updates are possible via the ROTRONIC HW4 software.